Timeline of the 2017 Atlantic hurricane season

The 2017 Atlantic hurricane season was an event in the annual tropical cyclone season in the north Atlantic Ocean. This Atlantic hurricane season saw above-normal activity; it was the seventh most active season on record and the most active since 2005. The season officially began on June 1, 2017 and ended on November 30, 2017. These dates, adopted by convention, historically describe the period in each year when most tropical systems form. However, storm formation is possible at any time of the year, as demonstrated in 2017 by the formation of the season's first named storm, Tropical Storm Arlene, on April 19. The final storm of the season, Tropical Storm Rina degenerated to a remnant area of low pressure on November 9.

The 2017 season produced 17 named storms, of which 10 became hurricanes including six of which intensified into major hurricanes (Category 3, 4 or 5). Of those six, Harvey and Irma, became the first major hurricanes to make landfall on the continental United States in 12 years; a third hurricane, Nate, did so as well. September was both the most active month in the season and the most active month for Atlantic hurricanes ever recorded. Four long-lived major hurricanes—Irma, Jose, Lee and Maria—moved through the Atlantic Basin, as did the short-lived Hurricane Katia. Overall, more accumulated cyclone energy was generated during September 2017 than during the entire 2016 season. In April 2018, the World Meteorological Organization retired the names Harvey, Irma, Maria, and Nate from its rotating naming lists due to the number of deaths and amount of damage they caused, and they will not be used again for another Atlantic hurricane.

This timeline documents tropical cyclone formations, strengthening, weakening, landfalls, extratropical transitions, and dissipations during the season. It includes information that was not released throughout the season, meaning that data from post-storm reviews by the National Hurricane Center, such as a storm that was not initially warned upon, has been included.

By convention, meteorologists use one time zone when issuing forecasts and making observations: Coordinated Universal Time (UTC), and also use the 24-hour clock (where 00:00 = midnight UTC). The National Hurricane Center uses both UTC and the time zone where the center of the tropical cyclone is currently located. The time zones utilized (east to west) prior to 2020 were: Atlantic, Eastern, and Central. In this timeline, all information is listed by UTC first with the respective regional time included in parentheses. Additionally, figures for maximum sustained winds and position estimates are rounded to the nearest 5 units (knots, miles, or kilometers), following the convention used in the National Hurricane Center's products. Direct wind observations are rounded to the nearest whole number. Atmospheric pressures are listed to the nearest millibar and nearest hundredth of an inch of mercury.

April
April 19
 * 00:00 UTC (8:00 p.m. AST, April 18) at 31.1°N, -42.6°W – Subtropical Depression One develops from an area of low pressure about 850 nmi southwest of the Azores.

April 20
 * 00:00 UTC (8:00 p.m. AST April 19) at 32.8°N, -39.6°W – Subtropical Depression One transitions into Tropical Depression One roughly 675 nmi southwest of the Azores.
 * 06:00 UTC (2:00 a.m. AST) at 33.8°N, -39.2°W – Tropical Depression One intensifies into Tropical Storm Arlene approximately 625 nmi southwest of the Azores.

April 21
 * 00:00 UTC (8:00 p.m. AST April 20) at 39°N, -43°W – Tropical Storm Arlene attains its peak intensity with maximum sustained winds of 45 kn and a minimum barometric pressure of 990 mbar, about 700 nmi west of the Azores.
 * 12:00 UTC (8:00 a.m. AST) at 39.9°N, -49.3°W – Tropical Storm Arlene transitions into an extratropical cyclone roughly 985 nmi west of the Azores, and subsequently dissipates.

May

 * No tropical cyclones form in the Atlantic Ocean during the month of May.

June
June 1
 * The 2017 Atlantic hurricane season officially begins.

June 19
 * 18:00 UTC (2:00 p.m. AST) at 9.2°N, -58.9°W – Tropical Storm Bret forms from a tropical wave about 185 mi east-southeast of Trinidad, with a minimum barometric pressure of 1007 mbar.

June 20
 * 02:00 UTC (10:00 p.m. AST) at 10.1°N, -61.1°W – Tropical Storm Bret attains peak winds of 50 mph and makes landfall in southwestern Trinidad.
 * 09:00 UTC (5:00 a.m. AST) at 10.6°N, -62.6°W – Tropical Storm Bret makes landfall on the Paria Peninsula of Venezuela, with winds of 50 mph, and rapidly degenerates into a remnant low, which later dissipates.
 * 18:00 UTC (1:00 p.m. CDT) at 25.6°N, -90.6°W – Tropical Storm Cindy forms from a tropical wave about 210 nmi south-southwest of the mouth of the Mississippi River.

June 21
 * 00:00 UTC (7:00 p.m. CDT, June 20) at 26.2°N, -90.9°W – Tropical Storm Cindy attains peak sustained winds of 60 mph, about 250 nmi southeast of Cameron, Louisiana.

June 22
 * 06:00 UTC (1:00 a.m. CDT) at 29.4°N, -93.6°W – Tropical Storm Cindy attains a minimum barometric pressure of 991 mbar, about 30 nmi west-southwest of Cameron.
 * 07:00 UTC (2:00 a.m. CDT) at 29.8°N, -93.7°W – Tropical Storm Cindy makes landfall about 20 nmi west of Cameron, just east of the Sabine Pass, with sustained winds of 50 mph.

June 23
 * 00:00 UTC (7:00 p.m. CDT, June 22) at 32.8°N, -93.6°W – Tropical Storm Cindy weakens to a tropical depression about 25 nmi north-northeast of Shreveport, Louisiana.
 * 18:00 UTC (1:00 p.m. CDT) at 36.7°N, -88.1°W – Tropical Depression Cindy degenerates to a remnant low about 35 mi west of Hopkinsville, Kentucky, and subsequently dissipates.

July
July 5
 * 18:00 UTC (2:00 p.m. AST) at 12°N, -37.1°W – Tropical Depression Four develops from a tropical wave about 1425 nmi east of the Lesser Antilles.

July 6
 * 12:00 UTC (8:00 a.m. AST) at 13.3°N, -42.2°W – Tropical Depression Four attains its peak intensity with sustained winds of 30 mph and a minimum barometric pressure of 1,009 mbar, about 1120 nmi east of the Lesser Antilles.

July 7
 * 12:00 UTC (8:00 a.m. AST) at 15.4°N, -49.7°W – Tropical Depression Four degenerates into a tropical wave roughly 860 nmi east of the Lesser Antilles, and subsequently dissipates.

July 17
 * 06:00 UTC (2:00 a.m. AST) at 10.4°N, -49.1°W – A tropical depression develops from a tropical wave about 725 mi east-southeast of Barbados.
 * 12:00 UTC (8:00 a.m. AST) at 10.7°N, -50.6°W – The tropical depression intensifies into Tropical Storm Don about 545 nmi east-southeast of Barbados.

July 18
 * 00:00 UTC (8:00 p.m. AST, July 17) at 11.2°N, -53.8°W – Tropical Storm Don attains its peak intensity with sustained winds of 50 mph and a minimum barometric pressure of 1,005 mbar, about 360 nmi east-southeast of Barbados.
 * 18:00 UTC (2:00 p.m. AST) at 11.5°N, -58.7°W – Tropical Storm Don opens up into a tropical wave about 150 nmi southeast of Barbados and subsequently dissipates.

July 30
 * 18:00 UTC (2:00 p.m. EDT) at 28.4°N, -85.4°W – Tropical Depression Six forms from an area of low pressure about 145 nmi west-northwest of St. Petersburg, Florida.

July 31
 * 00:00 UTC (8:00 p.m. EDT, July 30) at 28°N, -84.6°W – Tropical Depression Six intensifies to become Tropical Storm Emily about 97 nmi west of St. Petersburg.
 * 14:45 UTC (10:45 a.m. EDT) at 27.5°N, -82.7°W – Tropical Storm Emily reaches its peak intensity with sustained winds of 50 kn and a minimum pressure of 1001 mbar while simultaneously making landfall about 6 nmi north of Longboat Key, Florida.

August
August 1
 * 00:00 UTC (8:00 p.m. EDT, July 31) at 27.5°N, -81.3°W – Tropical Storm Emily weakens to a tropical depression inland, about 75 nmi east of Longboat Key.

August 2
 * 00:00 UTC (8:00 p.m. EDT, August 1) at 30.7°N, -78.1°W – Tropical Depression Emily degenerates to a post-tropical cyclone over the Atlantic Ocean, roughly 235 mi northeast of Cape Canaveral, Florida, and later dissipates.

August 7
 * 00:00 UTC (8:00 p.m. EDT, August 6) at 16.1°N, -82.7°W – Tropical Storm Franklin develops from a tropical wave about 75 nmi north-northeast of Cabo Gracias a Dios on the Honduras–Nicaragua border.

August 8
 * 03:45 UTC (10:45 p.m. EDT, August 7) at 19.1°N, -87.6°W – Tropical Storm Franklin makes landfall near Pulticub, Quintana Roo, with winds of 60 mph.

August 9
 * 00:00 UTC (7:00 p.m. CDT, August 8) at 20.2°N, -90.9°W – Tropical Storm Franklin emerges over the Bay of Campeche, 29 nmi northwest of Campeche City, Campeche.
 * 18:00 UTC (1:00 p.m. CDT) at 20.2°N, -94.4°W – Tropical Storm Franklin intensifies into a Category 1 hurricane, about 135 mi east-northeast of Veracruz City, Veracruz.

August 10
 * 00:00 UTC (7:00 p.m. CDT, August 9) at 20.3°N, -95.5°W – Hurricane Franklin attains its peak intensity with sustained winds of 75 kn and a minimum pressure of 981 mbar, about 80 nmi north-northeast of Veracruz City.
 * 05:00 UTC (12:00 a.m. CDT) at 20°N, -96.6°W – Hurricane Franklin makes landfall near Vega de Alatorre, Veracruz, with sustained winds of near 70 kn.
 * 06:00 UTC (1:00 a.m. CDT) at 20°N, -96.8°W – Hurricane Franklin weakens to a tropical storm inland, about 16 nmi west-southwest of Vega de Alatorre.
 * 12:00 UTC (7:00 a.m. CDT) at 19.8°N, -98.3°W – Tropical Storm Franklin weakens to a tropical depression about 60 mi east-northeast of Mexico City, and later dissipates.

August 12
 * 18::00 UTC (2:00 p.m. EDT) at 24°N, -69.4°W – Tropical Depression Eight forms from a tropical wave about 230 nmi northeast of the Turks and Caicos Islands.

August 13
 * 00:00 UTC (8:00 p.m. EDT, August 12) at 24.9°N, -70°W – Tropical Depression Eight intensifies into Tropical Storm Gert about 215 nmi northeast of the southeastern Bahamas.

August 15
 * 06:00 UTC (2:00 a.m. EDT) at 31.5°N, -72.3°W – Tropical Storm Gert intensifies into a Category 1 hurricane, about 380 nmi west of Bermuda.

August 16
 * 12:00 UTC (8:00 a.m. AST) at 38.8°N, -67.1°W – Hurricane Gert intensifies into a Category 2 hurricane, about 406 nmi west-northwest of Bermuda.
 * 18:00 UTC (2:00 p.m. AST) at 38.2°N, -64.1°W – Hurricane Gert attains its peak intensity with maximum sustained winds of 95 kn and a minimum pressure of 962 mbar, about 385 nmi south-southeast of Halifax, Nova Scotia.

August 17
 * 06:00 UTC (2:00 a.m. AST) at 40.7°N, -56.2°W – Hurricane Gert weakens to Category 1 strength, about 430 nmi south of St. John's, Newfoundland and Labrador.
 * 06:00 UTC (2:00 a.m. AST) at 13.4°N, -52°W – The ninth tropical depression of the season develops from a tropical wave about 440 nmi east of Barbados.
 * 12:00 UTC (8:00 a.m. AST) at 42.2°N, -52°W – Hurricane Gert weakens to a tropical storm, about 317 nmi south of St. John's.
 * 18:00 UTC (2:00 p.m. AST) at 44°N, -48°W – Hurricane Gert transitions into an extratropical cyclone, about 290 nmi southeast of St. John's, and subsequently merges with another extratropical cyclone.
 * 18:00 UTC (2:00 p.m. AST) at 13°N, -55.6°W – The ninth tropical depression intensifies into Tropical Storm Harvey about 234 nmi east of Barbados.

August 18
 * 00:00 UTC (8:00 p.m. AST, August 17) at 13°N, -56.6°W – Tropical Storm Harvey attains its initial peak windspeed of 40 kn, about 175 nmi east of Barbados.
 * 10:00 UTC (6:00 a.m. AST) at 13.1°N, -59.6°W – Tropical Storm Harvey makes landfall on Barbados, with sustained winds of 40 kn.
 * 15:00 UTC (11:00 a.m. AST) at 13.2°N, -61.2°W – Tropical Storm Harvey makes landfall on St. Vincent, with sustained winds of 40 kn.

August 19
 * 12:00 UTC (8:00 a.m. AST) at 13.7°N, -67.5°W – Tropical Storm Harvey weakens to a tropical depression about 368 nmi west of Saint Vincent.
 * 18:00 UTC (2:00 p.m. AST) at 13.8°N, -69.2°W – Tropical Depression Harvey degenerates to a tropical wave about 468 nmi west of St. Vincent.

August 23
 * 12:00 UTC (7:00 a.m. CDT) at 21.4°N, -92.3°W – The remnants of Harvey regenerate into a tropical depression in the Bay of Campeche, about 150 nmi west of Progreso, Yucatán.
 * 18:00 UTC (1:00 p.m. CDT) at 21.6°N, -92.4°W – Tropical Depression Harvey re-strengthens into a tropical storm about 152 nmi west of Progreso.

August 24
 * 18:00 UTC (1:00 p.m. CDT) at 24.4°N, -93.6°W – Tropical Storm Harvey intensifies into a Category 1 hurricane, about 325 mi south-southeast of Port O'Connor, Texas.

August 25
 * 06:00 UTC (1:00 a.m. CDT) at 25.6°N, -95.1°W – Hurricane Harvey intensifies into a Category 2 hurricane, about 210 mi south-southeast of Port O'Connor.
 * 18:00 UTC (1:00 p.m. CDT) at 27.1°N, -96.3°W – Hurricane Harvey intensifies into a Category 3 hurricane, about 90 mi south of Port O'Connor.

August 26
 * 00:00 UTC (7:00 p.m. CDT, August 25) at 27.8°N, -96.8°W – Hurricane Harvey intensifies into a Category 4 hurricane, about 50 mi south-southwest of Port O'Connor.
 * 03:00 UTC (10:00 p.m. CDT, August 25) at 28°N, -96.9°W – Hurricane Harvey attains its peak intensity with sustained winds of 115 kn and a minimum barometric pressure of 937 mbar, and simultaneously makes landfall on San Jose Island, Texas.
 * 06:00 UTC (1:00 a.m. CDT) at 28.2°N, -97.1°W – Hurricane Harvey weakens to Category 3 intensity as it makes landfall on the northeast end of Copano Bay, near Holiday Beach, Texas.
 * 12:00 UTC (7:00 a.m. CDT) at 28.7°N, -97.3°W – Hurricane Harvey weakens to Category 1 strength inland, about 34 nmi north-northwest of Holiday Beach.
 * 18:00 UTC (1:00 p.m. CDT) at 29°N, -97.5°W – Hurricane Harvey weakens to tropical storm strength, about 55 nmi north-northwest of Holiday Beach.

August 29
 * 18:00 UTC (1:00 p.m. CDT) at 28.5°N, -94.2°W – Tropical Storm Harvey attains a secondary peak windspeed of 45 kn in the Gulf of Mexico, about 91 nmi south-southwest of Cameron, Louisiana.

August 30
 * 00:00 UTC (8:00 p.m. AST, August 29) at 16.1°N, -26.9°W – The tenth tropical depression of the season develops from a tropical wave, about 120 nmi west-southwest of São Vicente in the Cabo Verde Islands.
 * 06:00 UTC (2:00 a.m. AST) at 16.2°N, -28.3°W – The tenth tropical depression develops into Tropical Storm Irma, about 195 nmi west-southwest of São Vicente.
 * 08:00 UTC (3:00 a.m. CDT) at 29.8°N, -93.5°W – Tropical Storm Harvey makes its final landfall about 10 nmi west of Cameron, with sustained winds of 40 kn.

August 31
 * 00:00 UTC (7:00 p.m. CDT, August 30) at 31.3°N, -92.6°W – Tropical Storm Harvey weakens to a tropical depression about 97 nmi northeast of Cameron.
 * 06:00 UTC (2:00 a.m. AST) at 16.4°N, -32.5°W – Tropical Storm Irma becomes a Category 1 hurricane about 400 nmi west of the Cabo Verde Islands.
 * 18:00 UTC (2:00 p.m. AST) at 17.1°N, -34.2°W – Hurricane Irma intensifies to Category 2 strength, about 502 nmi west of the Cabo Verde Islands.

September
September 1
 * 00:00 UTC (8:00 p.m. AST, August 31) at 17.5°N, -35.1°W – Hurricane Irma intensifies into Category 3 hurricane, about 555 nmi west of the Cabo Verde Islands.
 * 06:00 UTC (1:00 a.m. CDT) at 34.9°N, -88.2°W – Tropical Depression Harvey becomes extratropical over the Tennessee Valley, and subsequently dissipates.

September 2 September 3
 * 12:00 UTC (8:00 a.m. AST) at 18.9°N, -42.6°W – Hurricane Irma weakens into Category 2 hurricane, about 1,096 nmi east of Barbuda.
 * 12:00 UTC (8:00 a.m. AST) at 17.9°N, -47.9°W – Hurricane Irma re-strengthens into Category 3 hurricane, about 794 nmi east of Barbuda.

September 4
 * 18:00 UTC (2:00 p.m. AST) at 16.7°N, -53.9°W – Hurricane Irma intensifies into Category 4 hurricane, about 457 nmi east of Barbuda.

September 5
 * 06:00 UTC (2:00 a.m. AST) at 11.6°N, -37.9°W – The eleventh tropical depression of the season develops from a tropical wave about 837 nmi west of the Cabo Verde Islands.
 * 12:00 UTC (8:00 a.m. AST) at 16.7°N, -57.8°W – Hurricane Irma intensifies to Category 5 strength, about 237 nmi east-southeast of Barbuda.
 * 12:00 UTC (8:00 a.m. AST) at 12°N, -38.8°W – The eleventh tropical depression develops into Tropical Storm Jose, about 840 nmi west of the Cabo Verde Islands.
 * 12:00 UTC (7:00 a.m. CDT) at 22.2°N, -97.2°W – Tropical Depression Thirteen develops from a tropical wave about 189 nmi north-northwest of Veracruz, Veracruz.

September 6
 * 05:45 UTC (1:45 a.m. AST) at 17.7°N, -61.8°W – Hurricane Irma makes landfall on Barbuda with sustained winds of 155 kn.
 * 06:00 UTC (2:00 a.m. AST) at 17.7°N, -61.9°W – Hurricane Irma reaches its peak intensity with maximum sustained winds of 155 kn and a minimum barometric pressure of 914 mbar, about 6 nmi west of Barbuda.
 * 06:00 UTC (1:00 a.m. CDT) at 22.2°N, -96.4°W – Tropical Depression Thirteen intensifies into Tropical Storm Katia, about 180 nmi north of Veracruz.
 * 11:15 UTC (7:15 a.m. AST) at 18.1°N, -63.1°W – Hurricane Irma makes landfall on St. Martin with sustained winds of 155 kn.
 * 16:30 UTC (12:30 p.m. ADT) at 18.5°N, -64.4°W – Hurricane Irma makes landfall on Virgin Gorda, British Virgin Islands with sustained winds of 155 kn.
 * 18:00 UTC (2:00 a.m. AST) at 13.7°N, -45.2°W – Tropical Storm Jose becomes a Category 1 hurricane, about 1,000 nmi east of the Leeward Islands.
 * 18:00 UTC (1:00 p.m. CDT) at 21.8°N, -95.2°W – Tropical Storm Katia becomes a Category 1 hurricane, about 166 nmi north-northeast of Veracruz.

September 7
 * 12:00 UTC (8:00 a.m. AST) at 14.7°N, -49.9°W – Hurricane Jose intensifies into a Category 2 hurricane about 720 nmi east of the Leeward Islands.
 * 18:00 UTC (2:00 p.m. AST) at 15.1°N, -51.5°W – Hurricane Jose intensifies into a Category 3 hurricane about 625 nmi east of the Leeward Islands.

September 8
 * 05:00 UTC (1:00 a.m. EDT) at 21.5°N, -73°W – Hurricane Irma weakens to a Category 4 hurricane and makes landfall on Little Inagua, Bahamas, with sustained winds of 135 kn.
 * 06:00 UTC (2:00 a.m. AST) at 15.9°N, -54.9°W – Hurricane Jose intensifies into a Category 4 hurricane about 424 nmi east of the Leeward Islands.
 * 12:00 UTC (7:00 a.m. CDT) at 21.1°N, -95.7°W – Hurricane Katia intensifies into a Category 2 hurricane about 117 nmi north-northeast of Veracruz, Veracruz.
 * 18:00 UTC (2:00 p.m. EDT) at 22°N, -76°W – Hurricane Irma re-intensifies into a Category 5 hurricane about 107 nmi east of Cayo Romano, Cuba.
 * 18:00 UTC (1:00 p.m. CDT) at 21.1°N, -96.2°W – Hurricane Katia attains its peak intensity with maximum sustained winds of 90 kn and a minimum barometric pressure of 972 mbar, about 114 nmi north of Veracruz.

September 9
 * 00:00 UTC (8:00 p.m. AST, September 8) at 16.7°N, -58.9°W – Hurricane Jose attains its peak intensity with maximum sustained winds of 135 kn and a minimum barometric pressure of 938 mbar, about 190 nmi east of the Lesser Antilles.
 * 00:00 UTC (7:00 p.m. CDT, September 8) at 20.8°N, -96.9°W – Hurricane Katia weakens to a Category 1 hurricane about 104 nmi north of Veracruz.
 * 03:00 UTC (11:00 p.m. EDT, September 8) at 22.3°N, -77.9°W – Hurricane Irma makes landfall near Cayo Romano, Cuba, with winds of 145 kn.
 * 03:00 UTC (10:00 p.m. CDT September 8) at 20.6°N, -97.1°W – Hurricane Katia makes landfall at Tecolutla, Veracruz, with winds of 65 kn.
 * 06:00 UTC (2:00 a.m. EDT) at 22.4°N, -78.3°W – Hurricane Irma weakens to a Category 4 hurricane in the Jardines del Rey archipelago, about 78 nmi west of Cayo Romano.
 * 06:00 UTC (1:00 a.m. CDT) at 20.3°N, -97.4°W – Hurricane Katia weakens to a tropical storm about 95 nmi northwest of Veracruz.
 * 12:00 UTC (8:00 a.m. EDT) at 22.7°N, -79.3°W – Hurricane Irma weakens to a Category 3 hurricane about 41 nmi southeast of Isabela de Sagua, Cuba.
 * 12:00 UTC (7:00 a.m. CDT) at 20.1°N, -97.7°W – Tropical Storm Katia weakens into a tropical depression about 100 nmi west-northwest of Veracruz, and later dissipates.
 * 18:00 UTC (2:00 p.m. EDT) at 23.1°N, -80.2°W – Hurricane Irma weakens to a Category 2 hurricane about 16 nmi northwest of Isabela de Sagua.

September 10
 * 00:00 UTC (8:00 p.m. EDT, September 9) at 23.4°N, -80.9°W – Hurricane Irma re-intensifies into a Category 3 hurricane about 87 nmi south-southeast of Key West, Florida.
 * 06:00 UTC (2:00 a.m. EDT) at 23.7°N, -81.3°W – Hurricane Irma re-intensifies into a Category 4 hurricane about 55 nmi south-southeast of Key West, Florida.
 * 13:00 UTC (9:00 a.m. EDT) at 24.7°N, -81.5°W – Hurricane Irma makes landfall on Cudjoe Key, Florida, with winds of 115 kn.
 * 18:00 UTC (2:00 p.m. EDT) at 25.6°N, -81.7°W – Hurricane Irma weakens to a Category 3 hurricane about 24 nmi south of Marco Island, Florida.
 * 18:00 UTC (2:00 p.m. AST) at 22.2°N, -66.5°W – Hurricane Jose weakens to a Category 3 hurricane about 307 nmi northwest of the northern Leeward Islands.
 * 19:30 UTC (3:30 p.m. EDT) at 25.9°N, -81.7°W – Hurricane Irma makes its final landfall near Marco Island, with winds of 100 kn.

September 11
 * 00:00 UTC (8:00 p.m. EDT, September 10) at 26.8°N, -81.7°W – Hurricane Irma weakens to a Category 1 hurricane inland, about 13 nmi east-northeast of Fort Myers, Florida.
 * 06:00 UTC (2:00 a.m. AST) at 24.3°N, -68.6°W – Hurricane Jose weakens to a Category 2 hurricane about 478 nmi northwest of the northern Leeward Islands.
 * 12:00 UTC (8:00 a.m. EDT) at 29.6°N, -82.7°W – Hurricane Irma weakens to a tropical storm about 20 nmi west of Gainesville, Florida.
 * 18:00 UTC (2:00 p.m. AST) at 26.5°N, -69.5°W – Hurricane Jose weakens to a Category 1 hurricane about 611 nmi northwest of the northern Leeward Islands.

September 12
 * 06:00 UTC (2:00 a.m. EDT) at 32.9°N, -85.6°W – Tropical Storm Irma degenerates into a remnant low over central Alabama, and subsequently dissipates.

September 14
 * 18:00 UTC (2:00 p.m. AST) at 10.4°N, -23.1°W – Tropical Depression Fourteen develops from a tropical wave about 265 nmi south of the Cabo Verde Islands.

September 15
 * 00:00 UTC (8:00 p.m. EDT, September 14) at 25.4°N, -67.6°W – Hurricane Jose weakens to a tropical storm about 594 nmi northwest of the northern Leeward Islands.
 * 18:00 UTC (2:00 p.m. EDT) at 26.8°N, -69.9°W – Tropical Storm Jose re-intensifies into a Category 1 hurricane about 736 nmi northwest of the northern Leeward Islands.

September 16
 * 12:00 UTC (8:00 a.m. AST) at 12.5°N, -33.1°W – Tropical Depression Fourteen intensifies into Tropical Storm Lee about 582 nmi southwest of the Cabo Verde Islands.
 * 12:00 UTC (8:00 a.m. AST) at 12.2°N, -49.7°W – Tropical Depression Fifteen develops from a tropical wave about 580 nmi east of Barbados.
 * 18:00 UTC (2:00 p.m. AST) at 12.2°N, -51.7°W – Tropical Depression Fifteen intensifies into Tropical Storm Maria about 460 nmi east of Barbados.

September 17
 * 12:00 UTC (8:00 a.m. EDT) at 30.5°N, -71.9°W – Hurricane Jose attains a secondary peak intensity with sustained winds of 80 kn and a barometric pressure of 967 mbar, about 430 nmi southeast of Virginia Beach, Virginia.
 * 12:00 UTC (8:00 a.m. AST) at 12.9°N, -36.2°W – Tropical Storm Lee weakens to a tropical depression about 754 nmi west-southwest of the Cabo Verde Islands.
 * 18:00 UTC (2:00 p.m. AST) at 13.6°N, -57°W – Tropical Storm Maria intensifies into a Category 1 hurricane, about 272 nmi east-southeast of Dominica.

September 18
 * 12:00 UTC (8:00 a.m. AST) at 14.5°N, -59.7°W – Hurricane Maria intensifies into a Category 3 hurricane, about 107 nmi east-southeast of Dominica.

September 19
 * 00:00 UTC (8:00 p.m. AST, September 18) at 15.3°N, -61.1°W – Hurricane Maria intensifies into a Category 5 hurricane, about 13 nmi east-southeast of Dominica.
 * 01:15 UTC (9:15 p.m. AST, September 18) at 15.4°N, -61.3°W – Hurricane Maria makes landfall in Dominica with maximum winds near 145 kn.
 * 06:00 UTC (2:00 a.m. AST) at 15.7°N, -61.9°W – Hurricane Maria weakens to Category 4 strength, about 39 nmi west-northwest of Dominica.
 * 12:00 UTC (8:00 a.m. EDT) at 36.3°N, -71.7°W – Hurricane Jose weakens again to a tropical storm, about 210 nmi east of Virginia Beach.
 * 12:00 UTC (8:00 a.m. AST) at 16.1°N, -62.7°W – Hurricane Maria re-strengthens into a Category 5 hurricane about 154 nmi southeast of Saint Croix.
 * 18:00 UTC (2:00 p.m. AST) at 16.8°N, -44.4°W – Tropical Depression Lee re-intensifies into a tropical storm about 960 nmi east of the northern Leeward Islands.

September 20
 * 03:00 UTC (11:00 p.m. AST, September 19) at 17.3°N, -64.7°W – Hurricane Maria attains its peak intensity with maximum sustained winds of 150 kn and a minimum barometric pressure of 908 mbar, about 25 nmi south of Saint Croix.
 * 10:15 UTC (6:15 a.m. AST) at 18°N, -65.9°W – Hurricane Maria weakens to a Category 4 hurricane and makes landfall near Yabucoa, Puerto Rico with maximum winds near 135 kn.
 * 12:00 UTC (8:00 a.m. AST) at 20.4°N, -44.1°W – Tropical Storm Lee degenerates to a trough of low pressure about 1,000 nmi east of the northern Leeward Islands.
 * 18:00 UTC (2:00 p.m. AST) at 18.6°N, -67°W – Hurricane Maria emerges off the northwest coast of Puerto Rico at Category 2 strength, about 15 mi west of Arecibo, Puerto Rico.

September 21
 * 06:00 UTC (2:00 a.m. AST) at 19.4°N, -68.2°W – Hurricane Maria re-strengthens into a Category 3 hurricane about 55 mi northeast of Punta Cana, Dominican Republic.

September 22
 * 00:00 UTC (8:00 p.m. AST, September 21) at 20.8°N, -70°W – Hurricane Maria reaches a secondary peak wind speed of near 110 kn, about 60 nmi southeast of Grand Turk Island.
 * 12:00 UTC (8:00 a.m. AST) at 30°N, -48.9°W – Remnants of Lee regenerate into a tropical depression about 825 nmi east-southeast of Bermuda.
 * 18:00 UTC (2:00 p.m. EDT) at 39.7°N, -69.1°W – Tropical Storm Jose becomes a post-tropical cyclone about 105 nmi south-southeast of Nantucket, Massachusetts, and subsequently dissipates.

September 23
 * 00:00 UTC (8:00 p.m. AST, September 22) at 31.1°N, -49.2°W – Tropical Depression Lee re-intensifies into a tropical storm about 795 nmi east of Bermuda.

September 24
 * 06:00 UTC (2:00 a.m. AST) at 31.7°N, -50.2°W – Tropical Storm Lee intensifies into a Category 1 hurricane about 740 nmi east of Bermuda.
 * 06:00 UTC 2:00 a.m. EDT) at 27.5°N, -72.6°W – Hurricane Maria weakens to a Category 2 hurricane, about 485 nmi south-southeast of Cape Hatteras, North Carolina.

September 25
 * 00:00 UTC (8:00 p.m. AST, September 24) at 31.2°N, -49.6°W – Hurricane Lee intensifies into a Category 2 hurricane, about 775 nmi east of Bermuda.
 * 06:00 UTC (2:00 a.m. AST) at 31°N, -49.5°W – Hurricane Lee weakens to a Category 1 hurricane, about 780 nmi east of Bermuda.
 * 06:00 UTC (2:00 a.m. EDT) at 30.3°N, -72.9°W – Hurricane Maria weakens to a Category 1 hurricane, about 322 nmi south-southeast of Cape Hatteras, North Carolina.

September 26
 * 06:00 UTC (2:00 a.m. AST) at 30.1°N, -52°W – Hurricane Lee re-intensifies into a Category 2 hurricane about 665 nmi east-southeast of Bermuda.

September 27
 * 12:00 UTC (8:00 a.m. AST) at 30.3°N, -56.6°W – Hurricane Lee intensifies into a Category 3 hurricane, about 435 nmi east-southeast of Bermuda.
 * 18:00 UTC (2:00 p.m. AST) at 30.8°N, -57°W – Hurricane Lee attains its peak intensity with maximum sustained winds of 100 kn and a minimum barometric pressure of 962 mbar, about 405 nmi east of Bermuda.

September 28
 * 00:00 UTC (8:00 p.m. AST, September 27) at 31.4°N, -57.2°W – Hurricane Lee weakens to a Category 2 hurricane about 385 nmi east of Bermuda.
 * 06:00 UTC (2:00 a.m. EDT) at 36.7°N, -71.3°W – Hurricane Maria weakens to a tropical storm about 223 nmi east-northeast of Cape Hatteras.
 * 18:00 UTC (2:00 p.m. AST) at 34.3°N, -56.6°W – Hurricane Lee weakens to a Category 1 hurricane about 420 nmi east-northeast of Bermuda.

September 29
 * 18:00 UTC (2:00 p.m. AST) at 41°N, -48.2°W – Hurricane Lee weakens to a tropical storm about 945 nmi northeast of Bermuda.

September 30
 * 06:00 UTC (2:00 a.m. AST) at 45.8°N, -38.9°W – Tropical Storm Lee becomes a post-tropical low about 400 nmi northwest of the Azores, and later opens up into a trough.
 * 18:00 UTC (2:00 p.m. AST) at 41.2°N, -45.6°W – Tropical Storm Maria becomes extratropical about 465 nmi southeast of Cape Race, Newfoundland, and subsequently dissipates.

October
October 4
 * 12:00 UTC (8:00 a.m. EDT) at 12°N, -81.8°W – Tropical Depression Sixteen forms from an area of low pressure approximately 35 nmi south of San Andres Island.

October 5
 * 06:00 UTC (02:00 a.m. EDT) at 13.1°N, -83.1°W – Tropical Depression Sixteen intensifies into Tropical Storm Nate about 85 nmi west-northwest of San Andres Island.
 * 12:00 UTC (08:00 a.m. EDT) at 13.9°N, -83.5°W – Tropical Storm Nate makes landfall on the coast of northeastern Nicaragua with winds of 35 kn.

October 7
 * 06:0 UTC (1:00 a.m. CDT) at 23.5°N, -86.5°W – Tropical Storm Nate intensifies into a Category 1 hurricane over the southeastern Gulf of Mexico, about 366 nmi south-southeast of the mouth of the Mississippi River.
 * 18:00 UTC (1:00 p.m. CDT) at 27.6°N, -88.9°W – Hurricane Nate attains its peak intensity with maximum sustained winds of 80 kn and a minimum barometric pressure of 981 mbar, about 91 nmi south of the mouth of the Mississippi River.

October 8
 * 00:00 UTC (7:00 p.m. CDT, October 7) at 29.1°N, -89.2°W – Hurricane Nate makes landfall at the mouth of the Mississippi River with maximum winds of 75 kn.
 * 05:20 UTC (12:20 a.m. CDT) at 30.4°N, -89°W – Hurricane Nate makes its final landfall about 5 nmi west of Biloxi, Mississippi with maximum winds of 65 kn.
 * 06:00 UTC (1:00 a.m. CDT) at 30.5°N, -88.9°W – Hurricane Nate weakens to a tropical storm inland, about 5 nmi north of Biloxi.
 * 18:00 UTC (1:00 p.m. CDT) at 34.1°N, -87.1°W – Tropical Storm Nate weakens into a tropical depression over northern Alabama.

October 9
 * 00:00 UTC (8:00 p.m. EDT, October 8) at 36.2°N, -85.7°W – Tropical Depression Nate degenerates to a remnant low over central Tennessee.
 * 06:00 UTC (2:00 a.m. EDT) at 39.1°N, -83.4°W – The remnants of Nate become extratropical over southern Ohio, and subsequently dissipate.
 * 06:00 UTC (2:00 a.m. AST) at 30.9°N, -40°W – Tropical Storm Ophelia develops from an area of low pressure about 760 nmi west-southwest of the Azores.

October 11
 * 18:00 UTC (2:00 p.m. AST) at 29.8°N, -36.2°W – Tropical Storm Ophelia intensifies into a Category 1 hurricane about 660 nmi southwest of the Azores.

October 12
 * 18:00 UTC (2:00 p.m. AST) at 30.5°N, -35.6°W – Hurricane Ophelia intensifies into Category 2 hurricane, about 620 nmi southwest of the Azores.

October 13
 * 00:00 UTC (8:00 p.m. AST, October 12) at 30.5°N, -35.1°W – Hurricane Ophelia reaches an initial peak windspeed of 90 kn, about 570 nmi southwest of the Azores.
 * 12:00 UTC (8:00 a.m. AST) at 31.4°N, -33.4°W – Hurricane Ophelia weakens to a Category 1 hurricane about 505 nmi southwest of the Azores.

October 14
 * 00:00 UTC (8:00 p.m. AST, October 13) at 32.6°N, -31.5°W – Hurricane Ophelia re-strengthens into a Category 2 hurricane about 400 nmi southwest of the Azores.
 * 12:00 UTC (8:00 a.m. AST) at 34.2°N, -27.7°W – Hurricane Ophelia intensifies into Category 3 hurricane and simultaneously attains its peak intensity with maximum sustained winds of 100 kn and a minimum pressure of 959 mbar about 270 nmi south of the Azores.

October 15
 * 00:00 UTC (8:00 p.m. AST, October 14) at 36.4°N, -22.6°W – Hurricane Ophelia weakens to a Category 2 hurricane about 298 nmi southeast of the Azores.
 * 18:00 UTC (2:00 p.m. AST) at 43.1°N, -14.3°W – Hurricane Ophelia weakens to a Category 1 hurricane about 545 nmi southwest of Mizen Head, Ireland.

October 16
 * 00:00 UTC (8:00 p.m. AST, October 15) at 47.6°N, -13.4°W – Hurricane Ophelia becomes an extratropical cyclone about 270 nmi southwest of Mizen Head, and subsequently dissipates.

October 28
 * 12:00 UTC (8:00 a.m. EDT) at 20.1°N, -83.5°W – Tropical Depression Eighteen forms from a tropical wave about 85 nmi south-southwest of Isle of Youth.
 * 18:00 UTC (2:00 p.m. EDT) at 21.3°N, -82.4°W – Tropical Depression Eighteen intensifies into Tropical Storm Philippe and simultaneously attains its peak intensity with winds of 35 kn and a minimum pressure of 1,000 mbar, about 30 nmi east-southeast of the Isle of Youth.
 * 22:00 UTC (6:00 p.m. EDT) at 22.2°N, -81.6°W – Tropical Storm Philippe makes landfall along southern coast of the Zapata Peninsula of Cuba, about 25 nmi west of the Bay of Pigs, with winds of 35 kn.

October 29
 * 00:00 UTC (8:00 p.m. EDT October 28) at 22.7°N, -81.2°W – Tropical Storm Philippe weakens to a tropical depression inland over west-central Cuba, and later dissipates.



November
November 5
 * 18:00 UTC (2:00 p.m. AST) at 29.2°N, -51.7°W – Tropical Depression Nineteen develops from the interaction between a tropical wave and a large mid- to upper-level trough about 700 nmi east-southeast of Bermuda.

November 7
 * 00:00 UTC (8:00 p.m. AST November 6) at 30°N, -50°W – Tropical Depression Nineteen intensifies into Tropical Storm Rina about 780 nmi east of Bermuda.

November 8
 * 06:00 UTC (2:00 a.m. AST) at 36.4°N, -48.7°W – Tropical Storm Rina attains peak sustained winds of 50 kn about 650 nmi south-southeast of Cape Race, Newfoundland.

November 9
 * 00:00 UTC (8:00 p.m. AST, November 8) at 41.8°N, -48.8°W – Tropical Storm Rina attains a minimum barometric pressure of 991 mbar about 347 nmi south-southeast of Cape Race.
 * 06:00 UTC (2:00 a.m. AST) at 43.6°N, -48°W – Tropical Storm Rina becomes a post-tropical cyclone about 300 nmi southeast of Cape Race, Newfoundland, and later merges with a complex extratropical low pressure area.

November 30
 * The 2017 Atlantic hurricane season officially ends.