Timeline of the 2023 Atlantic hurricane season

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January 16

• 12:00 UTC (8:00 a.m. AST) at 37°06′N 66°06′W / 37.1°N 66.1°W / 37.1; -66.1 – A subtropical storm forms about 345 mi (555 km) southeast of Nantucket, Massachusetts.^{[nb 2][6]}

January 17

• 00:00 UTC (8:00 p.m. AST, January 16) at 39°48′N 61°36′W / 39.8°N 61.6°W / 39.8; -61.6 – The unnamed subtropical storm reaches peak intensity with maximum sustained winds of 70 mph (110 km/h) and a minimum central pressure of 976 mbar (28.82 inHg), about 345 mi (555 km) south-southeast of Halifax, Nova Scotia.^[6]
• 12:45 UTC (8:45 a.m. AST) at 45°54′N 60°00′W / 45.9°N 60.0°W / 45.9; -60.0 – The unnamed subtropical storm makes landfall at Louisbourg, Nova Scotia, with sustained winds of 50 mph (85 km/h).^[6]
• 18:00 UTC (2:00 p.m. AST) at 48°24′N 60°12′W / 48.4°N 60.2°W / 48.4; -60.2 – The unnamed subtropical storm transitions to a post-tropical low south of the coast of far eastern Quebec, and subsequently dissipates.^[6]

June 1

• The Atlantic hurricane season officially begins.^[2]
• 12:00 UTC (7:00 a.m. CDT) at 27°42′N 86°12′W / 27.7°N 86.2°W / 27.7; -86.2 – Tropical Depression Two forms off the western coast of Florida.^[7]

June 2

• 18:00 UTC (1:00 p.m. CDT) at 27°18′N 86°24′W / 27.3°N 86.4°W / 27.3; -86.4 – Tropical Depression Two strengthens into Tropical Storm Arlene.^[7]

June 3

• 00:00 UTC (7:00 p.m. CDT, June 2) at 25°54′N 85°42′W / 25.9°N 85.7°W / 25.9; -85.7 – Tropical Storm Arlene reaches peak intensity with maximum sustained winds of 40 mph (65 km/h) and a minimum central pressure of 998 mbar (29.47 inHg).^[7]
• 06:00 UTC (1:00 a.m. CDT) at 25°00′N 85°36′W / 25.0°N 85.6°W / 25.0; -85.6 – Tropical Storm Arlene weakens to a tropical depression.^[7]
• 12:00 UTC (8:00 a.m. EDT) at 24°24′N 85°18′W / 24.4°N 85.3°W / 24.4; -85.3 – Tropical Depression Arlene degenerates into a remnant low, and subsequently dissipates.^[7]

June 19

• 06:00 UTC (2:00 a.m. AST) at 10°42′N 37°18′W / 10.7°N 37.3°W / 10.7; -37.3 – Tropical Depression Three forms from a tropical wave about 1,495 mi (2,410 km) east of Barbados.^[8]
• 18:00 UTC (2:00 p.m. AST) at 11°06′N 40°54′W / 11.1°N 40.9°W / 11.1; -40.9 – Tropical Depression Three strengthens into Tropical Storm Bret about 1,100 mi (1,770 km) east of Barbados.^[8]

June 22

• 00:00 UTC (8:00 p.m. AST, June 21) at 10°24′N 39°54′W / 10.4°N 39.9°W / 10.4; -39.9 – Tropical Depression Four forms from a tropical wave over the central tropical Atlantic.^[9]
• 06:00 UTC (2:00 a.m. AST) at 13°30′N 55°54′W / 13.5°N 55.9°W / 13.5; -55.9 – Tropical Storm Bret reaches peak intensity with maximum sustained winds of 70 mph (110 km/h) and a minimum central pressure of 996 mbar (29.41 inHg), east of Barbados.^[8]

June 23

• 00:00 UTC (8:00 p.m. AST, June 22) at 11°30′N 44°48′W / 11.5°N 44.8°W / 11.5; -44.8 – Tropical Depression Four strengthens into Tropical Storm Cindy east of the Lesser Antilles.^[9]
• 03:15 UTC (2:15 a.m. AST) at 13°18′N 61°12′W / 13.3°N 61.2°W / 13.3; -61.2 – Tropical Storm Bret makes landfall with sustained winds of 65 mph (100 km/h) on Saint Vincent, Saint Vincent and the Grenadines.^[8]

June 24

• 06:00 UTC (2:00 a.m. AST) at 14°36′N 51°12′W / 14.6°N 51.2°W / 14.6; -51.2 – Tropical Storm Cindy reaches peak intensity with maximum sustained winds of 50 mph (80 km/h) and a minimum central pressure of 1004 mbar (29.65 inHg).^[9]
• 12:00 UTC (8:00 a.m. EDT) at 13°00′N 70°54′W / 13.0°N 70.9°W / 13.0; -70.9 – Tropical Storm Bret opens into a trough about 70 mi (110 km) northwest of Aruba, and subsequently dissipates.^[8]

June 26

• 03:00 UTC (11:00 p.m. AST, June 25) at 22°48′N 60°00′W / 22.8°N 60.0°W / 22.8; -60.0 – Tropical Storm Cindy degenerates to an open wave about 375 mi (605 km) north-northeast of the Northern Leeward Islands.^{[nb 3][11]}

July 14

• 00:00 UTC (8:00 p.m. AST, July 13) at 32°30′N 46°42′W / 32.5°N 46.7°W / 32.5; -46.7 – Subtropical Storm Don forms from an area of low pressure about 1,180 mi (1,900 km) southwest of the Azores.^[12]

July 16

• 12:00 UTC (8:00 a.m. AST) at 38°54′N 48°30′W / 38.9°N 48.5°W / 38.9; -48.5 – Subtropical Storm Don weakens to a subtropical depression about 1,150 mi (1,850 km) west of the Azores.^[12]

July 17

• 06:00 UTC (6:00 a.m. GMT) at 39°18′N 45°00′W / 39.3°N 45.0°W / 39.3; -45.0 – Subtropical Depression Don transitions to a tropical depression about 960 mi (1,545 km) west of the Azores.^[12]

July 18

• 00:00 UTC (12:00 a.m. GMT) at 37°48′N 40°54′W / 37.8°N 40.9°W / 37.8; -40.9 – Tropical Depression Don strengthens into a tropical storm about 750 mi (1,205 km) west of the Azores.^[12]

July 22

• 18:00 UTC (2:00 p.m. AST) at 39°30′N 50°06′W / 39.5°N 50.1°W / 39.5; -50.1 – Tropical Storm Don strengthens into a Category 1 hurricane and simultaneously reaches peak intensity with maximum sustained winds of 75 mph (120 km/h) and a minimum central pressure of 986 mbar (29.12 inHg), about 1,230 mi (1,980 km) west-northwest of the Azores.^[12]

July 23

• 06:00 UTC (5:00 a.m. AST) at 42°00′N 49°24′W / 42.0°N 49.4°W / 42.0; -49.4 – Hurricane Don weakens to a tropical storm about 1,190 mi (1,915 km) northwest of the Azores.^[12]

July 24

• 06:00 UTC (6:00 a.m. GMT) at 46°42′N 44°06′W / 46.7°N 44.1°W / 46.7; -44.1 – Tropical Storm Don transitions to a post-tropical cyclone about 1,020 mi (1,640 km) northwest of the Azores.^[12]

August 19

• 06:00 UTC (2:00 a.m. AST) at 15°24′N 47°48′W / 15.4°N 47.8°W / 15.4; -47.8 – Tropical Depression Six forms from a tropical wave east of the northern Leeward Islands.^[13]

August 20

• 00:00 UTC (8:00 p.m. AST, August 19) at 18°00′N 36°42′W / 18.0°N 36.7°W / 18.0; -36.7 – Tropical Storm Emily forms from a tropical wave over the open tropical Atlantic.^[14]
• 12:00 UTC (8:00 a.m. AST) at 19°24′N 38°18′W / 19.4°N 38.3°W / 19.4; -38.3 – Tropical Storm Emily reaches peak intensity with maximum sustained winds of 50 mph (85 km/h) and a minimum central pressure of 998 mbar (29.47 inHg).^[14]
• 12:00 UTC (8:00 a.m. AST) at 16°42′N 53°30′W / 16.7°N 53.5°W / 16.7; -53.5 – Tropical Depression Six strengthens into Tropical Storm Gert east of the northern Leeward Islands.^[13]
• 21:00 UTC (5:00 p.m. AST) at 14°36′N 67°06′W / 14.6°N 67.1°W / 14.6; -67.1 – Tropical Storm Franklin forms from an area of low pressure about 270 mi (435 km) south-southeast of Isla Saona, Dominican Republic.^[15]

August 21

• 06:00 UTC (2:00 a.m. AST) at 20°36′N 40°36′W / 20.6°N 40.6°W / 20.6; -40.6 – Tropical Storm Emily degenerates to a remnant low.^{[nb 4][14]}
• 12:00 UTC (8:00 a.m. AST) at 17°06′N 57°30′W / 17.1°N 57.5°W / 17.1; -57.5 – Tropical Storm Gert weakens to a tropical depression about 375 mi (605 km) east of the northern Leeward Islands.^[13]
• 18:00 UTC (6:00 p.m. CDT) at 25°00′N 90°48′W / 25.0°N 90.8°W / 25.0; -90.8 – Tropical Depression Nine forms about 415 mi (665 km) east of Brownsville, Texas, from a tropical wave.^{[nb 5][18]}

August 22

• 06:00 UTC (1:00 a.m. CDT) at 25°48′N 94°18′W / 25.8°N 94.3°W / 25.8; -94.3 – Tropical Depression Nine strengthens into Tropical Storm Harold about 190 mi (305 km) east of Brownsville.^[18]
• 12:00 UTC (8:00 a.m. AST) at 17°24′N 59°30′W / 17.4°N 59.5°W / 17.4; -59.5 – Tropical Depression Gert degenerates to a remnant low east-southeast of the northern Leeward Islands.^[13]
• 15:00 UTC (10:00 a.m. CDT) at 27°06′N 97°24′W / 27.1°N 97.4°W / 27.1; -97.4 – Tropical Storm Harold reaches peak intensity with maximum sustained winds of 60 mph (95 km/h) and a minimum central pressure of 995 mbar (29.38 inHg), and simultaneously makes landfall at Big Shell Beach, Padre Island, Texas.^[18]

August 23

• 00:00 UTC (7:00 p.m. CDT, August 22) at 27°42′N 100°06′W / 27.7°N 100.1°W / 27.7; -100.1 – Tropical Storm Harold weakens to a tropical depression over northeastern Mexico.^[18]
• 12:00 UTC (8:00 a.m. EDT) at 17°54′N 71°12′W / 17.9°N 71.2°W / 17.9; -71.2 – Tropical Storm Franklin makes landfall with sustained winds of 50 mph (85 km/h), about 25 miles (40 km) south-southwest of Barahona, Dominican Republic.^[19]
• 12:00 UTC (7:00 a.m. CDT) at 29°42′N 103°42′W / 29.7°N 103.7°W / 29.7; -103.7 – Tropical Depression Harold degenerates to a remnant low over the Big Bend region of Texas and later dissipates.^[18]

August 26

• 12:00 UTC (7:00 a.m. CDT) at 20°48′N 86°06′W / 20.8°N 86.1°W / 20.8; -86.1 – Tropical Depression Ten forms from a disturbance that originated in the eastern Pacific Ocean about 45 mi (75 km) east-southeast of Cancún, Quintana Roo.^[20]
• 15:00 UTC (11:00 a.m. AST) at 23°30′N 66°42′W / 23.5°N 66.7°W / 23.5; -66.7 – Tropical Storm Franklin strengthens into a Category 1 hurricane about 315 mi (505 km) east-northeast of Grand Turk Island.^[21]

August 27

• 06:00 UTC (1:00 a.m. CDT) at 20°30′N 86°48′W / 20.5°N 86.8°W / 20.5; -86.8 – Tropical Depression Ten makes land fall on Cozumel.^[20]
• 12:00 UTC (7:00 a.m. CDT) at 19°54′N 86°18′W / 19.9°N 86.3°W / 19.9; -86.3 – Tropical Depression Ten strengthens into Tropical Storm Idalia about 50 mi (85 km) southeast of Cozumel.^[20]
• 15:00 UTC (11:00 a.m. AST) at 25°06′N 69°18′W / 25.1°N 69.3°W / 25.1; -69.3 – Hurricane Franklin intensifies to Category 2 strength about 275 mi (445 km) north-northeast of Grand Turk Island.^[22]

August 28

• 09:00 UTC (5:00 a.m. EDT) at 27°12′N 70°48′W / 27.2°N 70.8°W / 27.2; -70.8 – Hurricane Franklin intensifies to Category 3 strength about 395 mi (635 km) north of Grand Turk Island.^[23]
• 11:35 UTC (7:35 a.m. EDT) at 27°24′N 70°48′W / 27.4°N 70.8°W / 27.4; -70.8 – Hurricane Franklin intensifies to Category 4 strength about 405 mi (650 km) north of Grand Turk Island.^[24]

August 29

• 00:00 UTC (8:00 p.m. EDT, August 28) at 29°00′N 71°06′W / 29.0°N 71.1°W / 29.0; -71.1 – Hurricane Franklin reaches peak intensity with maximum sustained winds of 150 mph (240 km/h) and a minimum central pressure of 926 mbar (27.34 inHg), about 440 mi (710 km) west-southwest of Bermuda.^[25]
• 00:00 UTC (8:00 p.m. AST, August 28) at 27°42′N 51°42′W / 27.7°N 51.7°W / 27.7; -51.7 – Tropical Depression Eleven forms over the central subtropical Atlantic from a tropical wave.^[26]
• 06:00 UTC (1:00 a.m. CDT) at 22°36′N 85°00′W / 22.6°N 85.0°W / 22.6; -85.0 – Tropical Storm Idalia strengthens into a Category 1 hurricane^[20] about 55 mi (90 km) north of the western tip of Cuba.^[27]
• 18:00 UTC (2:00 p.m. EDT) at 31°00′N 70°12′W / 31.0°N 70.2°W / 31.0; -70.2 – Hurricane Franklin weakens to Category 3 strength about 330 mi (530 km) west-southwest of Bermuda.^[28]

August 30

• 00:00 UTC (8:00 p.m. EDT) at 26°54′N 84°42′W / 26.9°N 84.7°W / 26.9; -84.7 – Hurricane Idalia intensifies to Category 2 strength about 125 mi (205 km) west of Tampa, Florida.^[20]
• 06:00 UTC (2:00 a.m. EDT) at 28°18′N 84°30′W / 28.3°N 84.5°W / 28.3; -84.5 – Hurricane Idalia intensifies to Category 3 strength^[20] about 100 mi (155 km) southwest of Cedar Key, Florida.^[29]
• 09:00 UTC (5:00 a.m. EDT) at 29°06′N 84°06′W / 29.1°N 84.1°W / 29.1; -84.1 – Hurricane Idalia intensifies to Category 4 strength and simultaneously reaches peak intensity with maximum sustained winds of 130 mph (215 km/h) and a minimum central pressure of 942 mbar (27.82 inHg), about 90 mi (150 km) south of Tallahassee, Florida.^[20]
• 09:00 UTC (5:00 a.m. AST) at 33°00′N 68°12′W / 33.0°N 68.2°W / 33.0; -68.2 – Hurricane Franklin weakens to Category 2 strength about 205 mi (330 km) west-northwest of Bermuda.^[30]
• 11:45 UTC (7:45 a.m. EDT) at 29°54′N 83°36′W / 29.9°N 83.6°W / 29.9; -83.6 – Hurricane Idalia makes landfall at Category 3 strength with sustained winds of 115 mph (185 km/h), near Keaton Beach, Florida.^[20]
• 18:00 UTC (2:00 p.m. EDT) at 31°30′N 82°30′W / 31.5°N 82.5°W / 31.5; -82.5 – Hurricane Idalia weakens to a tropical storm^[20] near Waycross, Georgia.^[31]

August 31

• 00:00 UTC (8:00 p.m. AST, August 30) at 28°18′N 52°06′W / 28.3°N 52.1°W / 28.3; -52.1 – Tropical Depression Eleven strengthens into Tropical Storm Jose.^[26]
• 12:00 UTC (8:00 a.m. EDT) at 33°42′N 77°00′W / 33.7°N 77.0°W / 33.7; -77.0 – Tropical Storm Idalia transitions to an extratropical cyclone about 60 mi (95 km) east of Cape Fear, North Carolina.^[20]
• 18:00 UTC (2:00 p.m. AST) at 28°36′N 57°00′W / 28.6°N 57.0°W / 28.6; -57.0 – Remnants of Gert re-develop into a tropical depression far north of the Leeward Islands.^[13]
• 18:00 UTC (5:00 p.m. CVT) at 17°00′N 27°00′W / 17.0°N 27.0°W / 17.0; -27.0 – Tropical Depression Twelve forms from a tropical wave near Cabo Verde.^[32]
• 21:00 UTC (5:00 p.m. AST) at 36°00′N 60°06′W / 36.0°N 60.1°W / 36.0; -60.1 – Hurricane Franklin weakens to Category 1 strength about 370 mi (595 km) northeast of Bermuda.^[33]

September 1

• 00:00 UTC (8:00 p.m. AST, August 13) at 31°36′N 52°30′W / 31.6°N 52.5°W / 31.6; -52.5 – Tropical Storm Jose reaches peak intensity with maximum sustained winds of 65 mph (100 km/h) and a minimum central pressure of 996 mbar (29.41 inHg).^[26]
• 18:00 UTC (2:00 p.m. AST) at 27°54′N 54°48′W / 27.9°N 54.8°W / 27.9; -54.8 – Tropical Depression Gert re-strengthens to a tropical storm.^[13]
• 18:00 UTC (2:00 p.m. AST) at 37°24′N 49°48′W / 37.4°N 49.8°W / 37.4; -49.8 – Tropical Storm Jose becomes absorbed into Post‑Tropical Cyclone Franklin.^[26]
• 21:00 UTC (5:00 p.m. AST) at 39°30′N 53°48′W / 39.5°N 53.8°W / 39.5; -53.8 – Hurricane Franklin transitions to an extratropical cyclone about 790 mi (1,270 km) northeast of Bermuda.^{[nb 6][35]}

September 2

• 00:00 UTC (11:00 p.m. CVT, September 1) at 21°06′N 28°30′W / 21.1°N 28.5°W / 21.1; -28.5 – Tropical Depression Twelve strengthens into Tropical Storm Katia.^[32]
• 18:00 UTC (2:00 p.m. AST) at 24°30′N 30°06′W / 24.5°N 30.1°W / 24.5; -30.1 – Tropical Storm Katia reaches peak intensity with maximum sustained winds of 60 mph (95 km/h) and a minimum central pressure of 998 mbar (29.47 inHg).^[32]

September 3

• 00:00 UTC (8:00 p.m. AST, September 2) at 28°36′N 58°30′W / 28.6°N 58.5°W / 28.6; -58.5 – Tropical Storm Gert reaches peak intensity with maximum sustained winds of 60 mph (95 km/h) and a minimum central pressure of 998 mbar (29.47 inHg).^[13]

September 4

• 00:00 UTC (12:00 a.m. GMT) at 27°06′N 33°18′W / 27.1°N 33.3°W / 27.1; -33.3 – Tropical Storm Katia weakens to a tropical depression.^[32]
• 06:00 UTC (6:00 a.m. GMT) at 27°24′N 33°36′W / 27.4°N 33.6°W / 27.4; -33.6 – Tropical Depression Katia degenerates to a remnant low and subsequently dissipates.^[32]
• 15:00 UTC (11:00 a.m. AST) at 39°24′N 58°00′W / 39.4°N 58.0°W / 39.4; -58.0 – Tropical Storm Gert degenerates into a remnant low and later dissipates.^[13]

September 5

• 12:00 UTC (8:00 a.m. AST) at 12°12′N 39°36′W / 12.2°N 39.6°W / 12.2; -39.6 – Tropical Depression Thirteen forms from a tropical wave about midway between the coast of west Africa and the Windward Islands.^[36]
• 18:00 UTC (2:00 p.m. AST) at 12°54′N 41°06′W / 12.9°N 41.1°W / 12.9; -41.1 – Tropical Depression Thirteen strengthens into Tropical Storm Lee.^[36]

September 6

• 18:00 UTC (2:00 p.m. AST) at 14°36′N 46°06′W / 14.6°N 46.1°W / 14.6; -46.1 – Tropical Storm Lee strengthens into a Category 1 hurricane.^[36]

September 7

• 12:00 UTC (8:00 a.m. AST) at 16°06′N 49°12′W / 16.1°N 49.2°W / 16.1; -49.2 – Hurricane Lee intensifies to Category 2 strength.^[36]
• 12:00 UTC (11:00 a.m. CVT) at 15°30′N 26°00′W / 15.5°N 26.0°W / 15.5; -26.0 – Tropical Depression Fourteen forms from a tropical wave near Cabo Verde.^[37]
• 18:00 UTC (2:00 p.m. AST) at 16°36′N 50°42′W / 16.6°N 50.7°W / 16.6; -50.7 – Hurricane Lee intensifies to Category 3 strength.^[36]
• 18:00 UTC (5:00 p.m. CVT) at 16°00′N 27°18′W / 16.0°N 27.3°W / 16.0; -27.3 – Tropical Depression Fourteen strengthens into Tropical Storm Margot.^[37]

September 8

• 00:00 UTC (8:00 p.m. AST, September 7) at 17°00′N 51°48′W / 17.0°N 51.8°W / 17.0; -51.8 – Hurricane Lee intensifies to Category 4 strength.
• 06:00 UTC (2:00 a.m. AST) at 17°30′N 53°00′W / 17.5°N 53.0°W / 17.5; -53.0 – Hurricane Lee intensifies to Category 5 strength, and simultaneously reaches peak intensity with maximum sustained winds of 165 mph (270 km/h) and a minimum central pressure of 926 mbar (27.34 inHg), several hundred miles east of the Leeward Islands.^[36]
• 12:00 UTC (8:00 a.m. AST) at 17°54′N 54°06′W / 17.9°N 54.1°W / 17.9; -54.1 – Hurricane Lee weakens to Category 4 strength.^[36]

September 9

• 00:00 UTC (8:00 p.m. AST, September 8) at 19°00′N 56°00′W / 19.0°N 56.0°W / 19.0; -56.0 – Hurricane Lee weakens to Category 3 strength.^[36]
• 18:00 UTC (2:00 p.m. AST) at 20°24′N 58°48′W / 20.4°N 58.8°W / 20.4; -58.8 – Hurricane Lee weakens to Category 2 strength.^[36]

September 10

• 18:00 UTC (2:00 p.m. AST) at 21°54′N 61°24′W / 21.9°N 61.4°W / 21.9; -61.4 – Hurricane Lee re-intensifies to Category 3 strength north of the Leeward Islands.^[36]

September 11

• 12:00 UTC (8:00 a.m. AST) at 23°12′N 63°12′W / 23.2°N 63.2°W / 23.2; -63.2 – Hurricane Lee reaches a secondary peak with maximum sustained winds of 120 mph (195 km/h) and a minimum central pressure of 948 mbar (27.99 inHg).^[36]
• 18:00 UTC (6:00 p.m. GMT) at 26°24′N 39°54′W / 26.4°N 39.9°W / 26.4; -39.9 – Tropical Storm Margot strengthens into a Category 1 hurricane.^[37]

September 12

• 06:00 UTC (6:00 a.m. GMT) at 33°00′N 39°54′W / 33.0°N 39.9°W / 33.0; -39.9 – Hurricane Margot reaches peak intensity with maximum sustained winds of 90 mph (150 km/h) and a minimum central pressure of 969 mbar (28.61 inHg).^[37]

September 13

• 12:00 UTC (8:00 a.m. AST) at 26°00′N 67°12′W / 26.0°N 67.2°W / 26.0; -67.2 – Hurricane Lee weakens to Category 2 strength^[36] about 460 mi (740 km) south-southwest of Bermuda.^[38]

September 14

• 12:00 UTC (8:00 a.m. AST) at 29°48′N 68°12′W / 29.8°N 68.2°W / 29.8; -68.2 – Hurricane Lee weakens to Category 1 strength^[36] about 265 mi (425 km) southwest of Bermuda.^[39]

September 15

• 06:00 UTC (6:00 a.m. GMT) at 36°42′N 38°36′W / 36.7°N 38.6°W / 36.7; -38.6 – Hurricane Margot weakens to a tropical storm.^[37]
• 06:00 UTC (2:00 a.m. AST) at 13°36′N 42°12′W / 13.6°N 42.2°W / 13.6; -42.2 – Tropical Depression Fifteen forms from a tropical wave over the tropical Atlantic.^[40]

September 16

• 06:00 UTC (2:00 a.m. AST) at 40°54′N 66°00′W / 40.9°N 66.0°W / 40.9; -66.0 – Hurricane Lee transitions to an extratropical cyclone^[36] roughly 285 mi (460 km) south-southwest of Halifax, Nova Scotia.^{[nb 7][41]}

September 17

• 00:00 UTC (12:00 a.m. GMT) at 34°00′N 40°06′W / 34.0°N 40.1°W / 34.0; -40.1 – Tropical Storm Margot degenerates into a remnant low and subsequently dissipates.^[37]
• 00:00 UTC (8:00 p.m. AST, September 16) at 21°24′N 47°36′W / 21.4°N 47.6°W / 21.4; -47.6 – Tropical Depression Fifteen strengthens into Tropical Storm Nigel.^[40]

September 18

• 06:00 UTC (2:00 a.m. AST) at 26°00′N 50°36′W / 26.0°N 50.6°W / 26.0; -50.6 – Tropical Storm Nigel strengthens into a Category 1 hurricane.^[40]

September 19

• 18:00 UTC (2:00 p.m. AST) at 31°06′N 54°42′W / 31.1°N 54.7°W / 31.1; -54.7 – Hurricane Nigel intensifies to Category 2 strength.^[40]

September 20

• 00:00 UTC (8:00 p.m. AST, September 19) at 32°24′N 55°00′W / 32.4°N 55.0°W / 32.4; -55.0 – Hurricane Nigel reaches peak intensity with maximum sustained winds of 100 mph (155 km/h) and a minimum central pressure of 971 mbar (28.67 inHg) over the Central Atlantic.^[40]
• 12:00 UTC (8:00 a.m. AST) at 35°12′N 54°42′W / 35.2°N 54.7°W / 35.2; -54.7 – Hurricane Nigel weakens to Category 1 strength.^[40]

September 22

• 06:00 UTC (6:00 a.m. GMT) at 45°24′N 34°24′W / 45.4°N 34.4°W / 45.4; -34.4 – Hurricane Nigel transitions to an extratropical cyclone, and subsequently dissipates.^[40]
• 18:00 UTC (2:00 p.m. EDT) at 32°42′N 76°06′W / 32.7°N 76.1°W / 32.7; -76.1 – Tropical Storm Ophelia forms from a non-tropical area of low pressure^[42] about 150 mi (240 km) southeast of Cape Fear, North Carolina.^{[nb 8][44]}

September 23

• 06:00 UTC (2:00 a.m. EDT) at 33°48′N 77°06′W / 33.8°N 77.1°W / 33.8; -77.1 – Tropical Storm Ophelia reaches peak intensity with maximum sustained winds of 70 mph (110 km/h) and a minimum central pressure of 981 mbar (28.97 inHg),^[42] about 55 mi (90 km) southwest of Cape Lookout, North Carolina.^[45]
• 06:00 UTC (2:00 a.m. AST) at 15°30′N 36°36′W / 15.5°N 36.6°W / 15.5; -36.6 – Tropical Depression Seventeen forms about 1,555 mi (2,500 km) east of Barbados.^[46]
• 10:15 UTC (6:15 a.m. EDT) at 34°42′N 77°06′W / 34.7°N 77.1°W / 34.7; -77.1 – Tropical Storm Ophelia makes landfall near Emerald Isle, North Carolina with sustained winds of 70 mph (110 km/h).^[42]
• 18:00 UTC (2:00 p.m. AST) at 15°42′N 39°06′W / 15.7°N 39.1°W / 15.7; -39.1 – Tropical Depression Seventeen strengthens into Tropical Storm Philippe about 1,385 mi (2,230 km) east of Barbados.^[46]

September 24

• 00:00 UTC (8:00 p.m. EDT, September 23) at 36°48′N 77°36′W / 36.8°N 77.6°W / 36.8; -77.6 – Tropical Storm Ophelia degenerates to a remnant low^[42] south-southwest of Richmond, Virginia.^[47]

September 25

• 06:00 UTC (2:00 a.m. AST) at 17°06′N 43°48′W / 17.1°N 43.8°W / 17.1; -43.8 – Tropical Storm Philippe reaches peak intensity with maximum sustained winds of 60 mph (95 km/h) and a minimum central pressure of 998 mbar (29.47 inHg) about 1,150 mi (1,850 km) east of Barbuda.^[46]

September 28

• 06:00 UTC (2:00 a.m. AST) at 15°36′N 44°30′W / 15.6°N 44.5°W / 15.6; -44.5 – Tropical Storm Rina forms east of the northern Leeward Islands.^[48]

September 29

• 06:00 UTC (2:00 a.m. AST) at 18°36′N 46°24′W / 18.6°N 46.4°W / 18.6; -46.4 – Tropical Storm Rina reaches peak intensity with maximum sustained winds of 50 mph (85 km/h) and a minimum central pressure of 999 mbar (29.50 inHg) east of the Northern Leeward Islands.^[48]

October 1

• 18:00 UTC (2:00 p.m. AST) at 25°48′N 55°18′W / 25.8°N 55.3°W / 25.8; -55.3 – Tropical Storm Rina degenerates into a remnant low northeast of the northern Leeward Islands.^[48]

October 2

• 22:45 UTC (6:45 p.m. AST) at 17°36′N 61°48′W / 17.6°N 61.8°W / 17.6; -61.8 – Tropical Storm Philippe makes landfall on Barbuda with sustained winds of 50 mph (85 km/h).^[46]

October 6

• 06:00 UTC (02:00 a.m. AST) at 28°42′N 65°30′W / 28.7°N 65.5°W / 28.7; -65.5 – Tropical Storm Philippe is absorbed by an extratropical low about 175 mi (280 km) south of Bermuda.^[46]

October 10

• 18:00 UTC (2:00 p.m. AST) at 9°36′N 30°12′W / 9.6°N 30.2°W / 9.6; -30.2 – Tropical Depression Nineteen forms from a low-latitude tropical wave far southwest of Cabo Verde.^[49]

October 11

• 00:00 UTC (8:00 p.m. AST, October 10) at 9°48′N 31°24′W / 9.8°N 31.4°W / 9.8; -31.4 – Tropical Depression Nineteen strengthens into Tropical Storm Sean.^[49]
• 18:00 UTC (2:00 p.m. AST) at 11°18′N 34°42′W / 11.3°N 34.7°W / 11.3; -34.7 – Tropical Storm Sean weakens to a tropical depression.^[49]

October 12

• 12:00 UTC (8:00 a.m. AST) at 12°48′N 37°06′W / 12.8°N 37.1°W / 12.8; -37.1 – Tropical Depression Sean re-strengthens to a tropical storm.^[49]
• 18:00 UTC (2:00 p.m. AST) at 13°18′N 37°48′W / 13.3°N 37.8°W / 13.3; -37.8 – Tropical Storm Sean reaches peak intensity with maximum sustained winds of 45 mph (75 km/h) and a minimum central pressure of 1005 mbar (29.68 inHg).^[49]

October 14

• 06:00 UTC (2:00 a.m. AST) at 15°18′N 43°18′W / 15.3°N 43.3°W / 15.3; -43.3 – Tropical Storm Sean weakens to a tropical depression.^[49]

October 15

• 12:00 UTC (8:00 a.m. AST) at 17°36′N 46°36′W / 17.6°N 46.6°W / 17.6; -46.6 – Tropical Depression Sean degenerates into a remnant low far east of the northern Leeward Islands, and subsequently dissipates.^[49]

October 18

• 18:00 UTC (2:00 p.m. AST) at 12°54′N 51°00′W / 12.9°N 51.0°W / 12.9; -51.0 – Tropical Storm Tammy forms from a well-defined tropical wave about 575 mi (925 km) east of the Lesser Antilles.^[50]

October 20

• 18:00 UTC (2:00 p.m. AST) at 14°06′N 58°54′W / 14.1°N 58.9°W / 14.1; -58.9 – Tropical Storm Tammy strengthens into a Category 1 hurricane about 115 mi (185 km) east of the Lesser Antilles.^[50]

October 22

• 01:15 UTC (9:15 p.m. AST October 21) at 17°36′N 61°48′W / 17.6°N 61.8°W / 17.6; -61.8 – Hurricane Tammy makes landfall with sustained winds of 90 mph (150 km/h) on Barbuda.^[50]

October 23

• 21:00 UTC (5:00 p.m. EDT) at 11°36′N 83°30′W / 11.6°N 83.5°W / 11.6; -83.5 – Tropical Depression Twenty-One forms from an area of disturbed weather along the eastern portion of the eastern Pacific monsoon trough about 80 mi (130 km) east of the coast of southern Nicaragua.^[51]

October 24

• 01:30 UTC (9:30 p.m. EDT, October 23) at 12°24′N 83°30′W / 12.4°N 83.5°W / 12.4; -83.5 – Tropical Depression Twenty-One makes landfall about 35 mi (55 km) north-northeast of Bluefields, Nicaragua.^[51]
• 12:00 UTC (8:00 a.m. EDT) at 13°30′N 84°24′W / 13.5°N 84.4°W / 13.5; -84.4 – Tropical Depression Twenty-One degenerates into a remnant low inland, and later dissipates.^{[nb 9][51]}

October 25

• 06:00 UTC (2:00 a.m. AST) at 25°06′N 60°24′W / 25.1°N 60.4°W / 25.1; -60.4 – Hurricane Tammy intensifies to Category 2 strength.^[50]
• 12:00 UTC (8:00 a.m. AST) at 26°06′N 59°24′W / 26.1°N 59.4°W / 26.1; -59.4 – Hurricane Tammy reaches peak intensity with maximum sustained winds of 110 mph (175 km/h) and a minimum central pressure of 965 mbar (28.50 inHg).^[50]

October 26

• 00:00 UTC (8:00 p.m. AST, October 25) at 29°54′N 57°48′W / 29.9°N 57.8°W / 29.9; -57.8 – Hurricane Tammy weakens to Category 1 strength.^[50]

October 27

• 00:00 UTC (8:00 p.m. AST, October 26) at 31°30′N 60°06′W / 31.5°N 60.1°W / 31.5; -60.1 – Hurricane Tammy weakens to a tropical storm.^[50]

October 29

• 00:00 UTC (8:00 p.m. AST, October 28) at 32°48′N 56°06′W / 32.8°N 56.1°W / 32.8; -56.1 – Tropical Storm Tammy degenerates into a remnant low, and subsequently dissipates over the central Atlantic.^[50]

• No tropical cyclones form in the basin during the month of November.^{[nb 10]}

November 30

• The Atlantic hurricane season officially ends.^[2]

• Timeline of the 2023 Pacific hurricane season
• Tropical cyclones in 2023
• Lists of Atlantic hurricanes