National Weather Service Marine Forecast FZUS52 KKEY

FZUS52 KKEY 162121
CWFKEY

Coastal Waters Forecast for the Florida Keys
National Weather Service Key West FL
421 PM EST Fri Jan 16 2026

Florida Bay, Hawk Channel and Straits of Florida from Ocean Reef to south of Dry Tortugas, and the extreme southeastern Gulf of America, including The Florida Keys National Marine Sanctuary

Seas are given as significant wave height, which is the average height of the highest 1/3 of the waves. Individual waves may be more than twice the significant wave height.

Wave Detail will include details about the period and direction of origin for the highest energy waves. Long-period swells coming from a different direction than the wind would be included in the Wave Detail.

GMZ005-170930
Synopsis for Keys coastal waters from Ocean Reef to Dry Tortugas 421 PM EST Fri Jan 16 2026

SYNOPSIS
High pressure centered near the Florida First Coast will continue to slide eastward. This will support rapidly slackening breezes through Saturday, with breezes continuing to clock to the northeast to east. The next cold front is progged to push through the Florida Keys coastal waters on Sunday or Sunday night, with fresh to strong northerly breezes in its wake for early to the middle part of next week.

The Approximate Shoreward Edge of the Gulf Stream as of January 12...

19 NM South of Dry Tortugas Light...on Loggerhead Key. 13 NM South of Cosgrove Shoal Light...off the Marquesas Keys. 15 NM South of Sand Key Light...off Key West. 17 NM South of Looe Key...off Big Pine Key. 17 NM Southeast of Sombrero Key Light...off Marathon. 15 NM Southeast of Alligator Reef Light...off Islamorada. 10 NM Southeast of Molasses Reef Light...off Key Largo. 5 NM Southeast of Carysfort Reef Light...off Ocean Reef.

Gulf Stream Information Courtesy of the National Weather Service in Key West based on products from NASA SPoRT and RTOFS.

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GMZ031-170930
Florida Bay including Barnes Sound, Blackwater Sound, and Buttonwood Sound
421 PM EST Fri Jan 16 2026

TONIGHT
Northeast winds 5 to 10 knots, becoming north to northeast near 10 knots. Bay waters smooth to a light chop, becoming a light chop. Isolated showers after midnight.

SATURDAY
Northeast to east winds near 10 knots, becoming northeast near 5 knots. Bay waters a light chop, becoming smooth. Isolated showers.

SATURDAY NIGHT
Northeast winds 5 to 10 knots, becoming north to northeast. Bay waters smooth to a light chop. Isolated showers.

SUNDAY
North winds near 10 knots, becoming northwest 15 to 20 knots in the afternoon. Bay waters a light chop, becoming choppy. Isolated showers.

SUNDAY NIGHT
Northwest to north winds 15 to 20 knots, becoming north. Bay waters choppy. Isolated showers.

MONDAY
North winds 15 to 20 knots, becoming north to northeast near 15 knots. Bay waters choppy, becoming a moderate chop.

MONDAY NIGHT
North to northeast winds 15 to 20 knots. Bay waters choppy.

TUESDAY
North to northeast winds near 20 knots, becoming northeast. Bay waters rough.

TUESDAY NIGHT
Northeast winds near 20 knots. Bay waters rough.

WEDNESDAY AND WEDNESDAY NIGHT
Northeast to east winds near 20 knots. Bay waters rough. Isolated showers.

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GMZ032-035-170930
Bayside and Gulfside from Craig Key to west end of Seven Mile Bridge
Gulf of America from west end of Seven Mile Bridge to Halfmoon Shoal out to 5 Fathoms
421 PM EST Fri Jan 16 2026

TONIGHT
North to northeast winds 5 to 10 knots, and increasing to near 10 knots. Seas 1 to 3 feet, except around 3 feet west of the Marquesas Keys. Nearshore waters smooth to a light chop, becoming a light chop. Isolated showers after midnight.

SATURDAY
Northeast winds near 10 knots, becoming north to northeast 5 to 10 knots. Seas subsiding to 1 to 2 feet, except subsiding to 2 to 3 feet west of the Marquesas Keys. Nearshore waters a light chop, becoming smooth to a light chop. Isolated showers.

SATURDAY NIGHT
North to northeast winds near 10 knots. Seas 1 to 2 feet. Nearshore waters a light chop. Isolated showers.

SUNDAY
North winds 10 to 15 knots, becoming northwest to north near 20 knots in the afternoon. Seas 1 to 2 feet, building to 2 to 3 feet. Nearshore waters a light to moderate chop, becoming rough. Isolated showers.

SUNDAY NIGHT
North winds 20 to 25 knots, decreasing to near 20 knots. Seas 3 to 5 feet, occasionally to 6 feet. West of the Marquesas Keys, seas 4 to 5 feet, occasionally to 6 feet, building to 5 to 7 feet, occasionally to 9 feet. Nearshore waters very rough, becoming rough. Isolated showers.

MONDAY
North winds near 20 knots, becoming north to northeast near 15 knots. Seas 3 to 5 feet, occasionally to 6 feet, except 5 to 7 feet, occasionally to 9 feet west of the Marquesas Keys. Nearshore waters rough, becoming a moderate chop.

MONDAY NIGHT
North to northeast winds near 15 knots, increasing to near 20 knots. Seas 2 to 4 feet, occasionally to 5 feet, except 4 to 5 feet, occasionally to 6 feet west of the Marquesas Keys. Nearshore waters a moderate chop, becoming rough.

TUESDAY
North to northeast winds near 20 knots. Seas 2 to 4 feet, occasionally to 5 feet, except 4 to 6 feet, occasionally to 8 feet west of the Marquesas Keys. Nearshore waters rough.

TUESDAY NIGHT
Northeast winds near 20 knots. Seas 2 to 4 feet, occasionally to 5 feet, except 5 to 6 feet, occasionally to 8 feet west of the Marquesas Keys. Nearshore waters rough.

WEDNESDAY AND WEDNESDAY NIGHT
Northeast to east winds near 20 knots. Seas 2 to 4 feet, occasionally to 5 feet, except 5 to 6 feet, occasionally to 8 feet west of the Marquesas Keys. Nearshore waters rough. Isolated showers.

WEDNESDAY NIGHT
Northeast to east winds near 20 knots. Seas 2 to 4 feet, occasionally to 5 feet, except 4 to 5 feet, occasionally to 6 feet west of the Marquesas Keys. Nearshore waters rough. Isolated showers.

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GMZ042>044-170930
Hawk Channel from Ocean Reef to Craig Key out to the reef
Hawk Channel from Craig Key to west end of Seven Mile Bridge out to the reef
Hawk Channel from west end of Seven Mile Bridge to Halfmoon Shoal out to the reef
421 PM EST Fri Jan 16 2026

TONIGHT
North to northeast winds near 10 knots, becoming northeast to east. Seas 2 to 3 feet, except 3 to 4 feet, occasionally to 5 feet west of Cosgrove Shoal Light. Nearshore waters a light chop. Isolated showers after midnight.

SATURDAY
Northeast winds 5 to 10 knots. Seas 2 to 3 feet. Nearshore waters smooth to a light chop. Isolated showers.

SATURDAY NIGHT
Northeast winds 5 to 10 knots. Seas 1 to 2 feet. Nearshore waters smooth to a light chop. Isolated showers.

SUNDAY
Northwest to north winds 10 to 15 knots, becoming northwest 15 to 20 knots in the afternoon. Seas 2 to 3 feet. Nearshore waters a light to moderate chop, becoming choppy in the afternoon. Isolated showers.

SUNDAY NIGHT
North winds 20 to 25 knots. Seas 2 to 3 feet, except 4 to 6 feet, occasionally to 8 feet west of Cosgrove Shoal Light. Nearshore waters very rough. Isolated showers.

MONDAY
North winds 15 to 20 knots. Seas 2 to 3 feet, except 5 to 6 feet, occasionally to 8 feet west of Cosgrove Shoal Light. Nearshore waters choppy.

MONDAY NIGHT
North to northeast winds 15 to 20 knots. Seas 2 to 3 feet, except 4 to 5 feet, occasionally to 6 feet west of Cosgrove Shoal Light. Nearshore waters choppy.

TUESDAY
North to northeast winds near 20 knots. Seas 2 to 3 feet, except 4 to 5 feet, occasionally to 6 feet west of Cosgrove Shoal Light. Nearshore waters rough.

TUESDAY NIGHT
Northeast winds 20 to 25 knots. Seas 2 to 4 feet, occasionally to 5 feet, except 4 to 5 feet, occasionally to 6 feet west of Cosgrove Shoal Light. Nearshore waters very rough.

WEDNESDAY
Northeast to east winds 20 to 25 knots. Seas 2 to 4 feet, occasionally to 5 feet, building to 4 to 5 feet, occasionally to 6 feet. West of Cosgrove Shoal Light, seas 4 to 5 feet, occasionally to 6 feet, building to 5 to 6 feet, occasionally to 8 feet. Nearshore waters very rough. Isolated showers.

WEDNESDAY NIGHT
Northeast to east winds 20 to 25 knots. Seas 4 to 5 feet, occasionally to 6 feet, except 5 to 6 feet, occasionally to 8 feet west of Cosgrove Shoal Light. Nearshore waters very rough. Isolated showers.

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GMZ052>055-072>075-170930
Straits of Florida from Ocean Reef to Craig Key out 20 NM
Straits of Florida from Craig Key to west end of Seven Mile Bridge out 20 NM
Straits of Florida from west end of Seven Mile Bridge to south of Halfmoon Shoal out 20 NM
Straits of Florida from Halfmoon Shoal to 20 NM west of Dry Tortugas out 20 NM
Straits of Florida from Ocean Reef to Craig Key 20 to 60 NM out
Straits of Florida from Craig Key to west end of Seven Mile Bridge 20 to 60 NM out
Straits of Florida from west end of Seven Mile Bridge to south of Halfmoon Shoal 20 to 60 NM out
Straits of Florida from Halfmoon Shoal to 20 NM west of Dry Tortugas 20 to 60 NM out
421 PM EST Fri Jan 16 2026

TONIGHT
Northeast winds 10 to 15 knots, becoming northeast to east and decreasing to 10 knots. Seas 3 to 5 feet, occasionally to 6 feet, subsiding to 3 to 4 feet, occasionally to 5 feet. Wave Detail: Northeast to east 4 feet at 7 seconds and west to northwest 3 feet at 9 seconds. Isolated showers.

SATURDAY
Northeast to east winds 5 to 10 knots. Seas subsiding to 2 to 3 feet. Wave Detail: East 3 feet at 6 seconds and west to northwest 2 feet at 8 seconds. Isolated showers.

SATURDAY NIGHT
Northeast winds near 10 knots. Seas 2 to 3 feet. Scattered showers.

SUNDAY
North winds 10 to 15 knots, becoming northwest to north near 20 knots. Seas 2 to 3 feet, building to 3 to 4 feet, occasionally to 5 feet. Scattered showers.

SUNDAY NIGHT
Northwest to north winds 20 to 25 knots, becoming north. Seas 3 to 5 feet, occasionally to 6 feet, building to 5 to 7 feet, occasionally to 9 feet. Isolated showers.

MONDAY
North winds near 20 knots, becoming north to northeast 15 to 20 knots. Seas 5 to 7 feet, occasionally to 9 feet. Isolated showers.

MONDAY NIGHT
North to northeast winds 15 to 20 knots, increasing to near 20 knots. Seas 4 to 6 feet, occasionally to 8 feet, building to 5 to 7 feet, occasionally to 9 feet.

TUESDAY
Northeast winds 20 to 25 knots. Seas 5 to 8 feet, occasionally to 10 feet. Isolated showers.

TUESDAY NIGHT
Northeast winds 20 to 25 knots. Seas 6 to 9 feet, occasionally to 10 feet. Isolated showers.

WEDNESDAY AND WEDNESDAY NIGHT
Northeast to east winds 20 to 25 knots. Seas 6 to 10 feet, occasionally to 12 feet. Isolated showers.

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GMZ033-034-170930
Gulf of America from East Cape Sable to Chokoloskee 20 to 60 NM out and beyond 5 fathoms
Gulf of America including Dry Tortugas and Rebecca Shoal Channel
421 PM EST Fri Jan 16 2026

TONIGHT
Northeast to east winds near 10 knots, increasing to 10 to 15 knots. Seas 3 to 5 feet, occasionally to 6 feet. Wave Detail: West to northwest 4 feet at 8 seconds and northeast to east 2 feet at 4 seconds. Isolated showers after midnight.

SATURDAY
Northeast winds 10 to 15 knots, decreasing to near 10 knots. Seas 3 to 4 feet, occasionally to 5 feet, subsiding to 2 to 3 feet. Wave Detail: West 3 feet at 7 seconds and northeast 2 feet at 4 seconds.

SATURDAY NIGHT
North to northeast winds near 10 knots. Seas around 2 feet. Isolated showers.

SUNDAY
North winds 10 to 15 knots, becoming northwest to north near 20 knots. Seas around 2 feet, building 3 to 4 feet, occasionally to 6 feet. Isolated showers.

SUNDAY NIGHT
North winds 20 to 25 knots, decreasing to near 20 knots. Seas 5 to 7 feet, occasionally to 9 feet. Isolated showers.

MONDAY
North winds near 20 knots, becoming north to northeast 15 to 20 knots. Seas 4 to 6 feet, occasionally to 8 feet.

MONDAY NIGHT
North to northeast winds 15 to 20 knots, increasing to near 20 knots. Seas 4 to 5 feet, occasionally to 6 feet.

TUESDAY
North to northeast winds near 20 knots. Seas 4 to 6 feet, occasionally to 8 feet.

TUESDAY NIGHT
Northeast winds 20 to 25 knots. Seas 5 to 7 feet, occasionally to 9 feet.

WEDNESDAY AND WEDNESDAY NIGHT
Northeast to east winds near 20 knots. Seas 5 to 7 feet, occasionally to 9 feet. Isolated showers.