National Weather Service Marine Forecast FZUS52 KKEY

FZUS52 KKEY 102125
CWFKEY

Coastal Waters Forecast for the Florida Keys
National Weather Service Key West FL
425 PM EST Sat Jan 10 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.

GMZ005-110930
Synopsis for Keys coastal waters from Ocean Reef to Dry Tortugas 425 PM EST Sat Jan 10 2026

SYNOPSIS
A ridge extending from the central to southwestern Atlantic will continue to slide east tonight. This will allow for breezes to gradually, but briefly slacken through Sunday morning. A cold front will push through late Sunday into early Monday with freshening northerly breezes. Breezes will begin to slacken and clock around from the east on Tuesday, then south to southwest on Wednesday ahead of the next approaching frontal system. Expect another round of freshening west to northwest breezes in its wake.

The Approximate Shoreward Edge of the Gulf Stream as of January 06...

17 NM South of Dry Tortugas Light...on Loggerhead Key. 11 NM South of Cosgrove Shoal Light...off the Marquesas Keys. 11 NM South of Sand Key Light...off Key West. 16 NM South of Looe Key...off Big Pine Key. 15 NM Southeast of Sombrero Key Light...off Marathon. 12 NM Southeast of Alligator Reef Light...off Islamorada. 7 NM Southeast of Molasses Reef Light...off Key Largo. 3 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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GMZ031-110930
Florida Bay including Barnes Sound, Blackwater Sound, and Buttonwood Sound
425 PM EST Sat Jan 10 2026

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

SUNDAY
Northeast winds 5 to 10 knots, becoming north to northeast and briefly decreasing to near 5 knots in the afternoon. Bay waters smooth to a light chop, becoming smooth. Isolated showers.

SUNDAY NIGHT
North to northeast winds near 10 knots, increasing to 15 to 20 knots. Bay waters a light chop, becoming choppy. Scattered showers.

MONDAY
Northeast winds near 20 knots, decreasing to 15 to 20 knots. Bay waters rough, becoming choppy. Scattered showers.

MONDAY NIGHT
Northeast winds near 15 knots, increasing to 15 to 20 knots. Bay waters a moderate chop, becoming choppy. Scattered showers.

TUESDAY
Northeast to east winds near 15 knots. Bay waters a moderate chop. Scattered showers.

TUESDAY NIGHT
Northeast to east winds near 15 knots, becoming east to southeast 10 to 15 knots. Bay waters a moderate chop, becoming a light to moderate chop. Scattered showers and isolated thunderstorms.

WEDNESDAY
East to southeast winds near 10 knots, becoming south to southwest. Bay waters a light chop. Scattered showers and isolated thunderstorms.

WEDNESDAY NIGHT
West to northwest 10 to 15 knots. Bay waters a light to moderate chop. Scattered showers and isolated thunderstorms.

THURSDAY
West winds 10 to 15 knots, increasing near 20 knots. Bay waters a light to moderate chop, becoming rough. Scattered showers and isolated thunderstorms.

THURSDAY NIGHT
Northwest to north winds near 20 knots, decreasing to 15 to 20 knots. Bay waters rough, becoming choppy. Isolated showers.

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GMZ032-035-110930
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
425 PM EST Sat Jan 10 2026

TONIGHT
East winds near 10 knots, becoming northeast to east 5 to 10 knots. Seas around 1 foot. Nearshore waters a light chop, becoming smooth to a light chop. Isolated showers.

SUNDAY
North to northeast winds 5 to 10 knots, increasing to near 10 knots late. Seas 1 foot or less, building to around 1 foot, except building to 1 to 2 feet west of the Marquesas Keys. Nearshore waters smooth to a light chop, becoming a light chop. Isolated showers.

SUNDAY NIGHT
North winds 10 to 15 knots, becoming north to northeast near 20 knots. Seas 1 to 2 feet, building to 2 to 3 feet, except building to 3 to 4 feet, occasionally to 5 feet west of the Marquesas Keys. Nearshore waters a light to moderate chop, becoming rough. Isolated showers.

MONDAY
Northeast winds near 20 knots, decreasing to 15 to 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, becoming choppy. Isolated showers.

MONDAY NIGHT
Northeast winds near 15 knots, increasing to 15 to 20 knots. Seas 2 to 3 feet, except 3 to 4 feet west of the Marquesas Keys. Nearshore waters a moderate chop, becoming choppy. Scattered showers.

TUESDAY
Northeast winds 15 to 20 knots, becoming northeast to east 10 to 15 knots. Seas 2 to 3 feet, subsiding to 1 to 2 feet. West of the Marquesas Keys, seas 2 to 3 feet. Nearshore waters choppy, becoming light to moderate chop. Scattered showers.

TUESDAY NIGHT
Northeast to east winds near 15 knots, becoming east to southeast 10 to 15 knots. Seas 1 to 2 feet. Nearshore waters a moderate chop, becoming a light to moderate chop. Scattered showers and isolated thunderstorms.

WEDNESDAY
Southeast winds near 10 knots, becoming southwest to west. Seas around 1 foot. Nearshore waters a light chop. Scattered showers and isolated thunderstorms.

WEDNESDAY NIGHT
West to northwest winds 10 to 15 knots. Seas building to 1 to 2 feet, except building to 3 to 4 feet west of the Marquesas Keys. Nearshore waters a light to moderate chop. Scattered showers and isolated thunderstorms.

THURSDAY
West winds 10 to 15 knots, increasing to west to northwest near 20 knots. Seas 2 to 4 feet, occasionally to 5 feet, building to 4 to 6 feet, occasionally to 8 feet. West of the Marquesas Keys seas building to 7 to 9 feet, occasionally to 11 feet. Nearshore waters a light to moderate chop, becoming rough. Scattered showers and isolated thunderstorms.

THURSDAY NIGHT
Northwest to north winds near 20 knots, decreasing to 15 to 20 knots. Seas 5 to 7 feet, occasionally to 9 feet, except 7 to 10 feet, occasionally to 13 feet west of the Marquesas Keys. Nearshore waters rough, becoming choppy. Isolated showers.

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GMZ042>044-110930
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
425 PM EST Sat Jan 10 2026

TONIGHT
Northeast to east winds 10 to 15 knots, decreasing to near 10 knots. Seas around 2 feet. Nearshore waters a light to moderate chop, becoming a light chop. Isolated showers.

SUNDAY
Northeast to east winds near 10 knots, becoming north to northeast and briefly decreasing to 5 to 10 knots in the afternoon. Seas 1 to 2 feet, subsiding to around 1 foot. Nearshore waters a light chop, becoming smooth to a light chop. Isolated showers.

SUNDAY NIGHT
North to northeast winds 10 to 15 knots, increasing to near 20 knots. Seas building to 1 to 2 feet, except building to 3 to 4 feet, occasionally to 5 feet west of Cosgrove Shoal Light. Nearshore waters a light to moderate chop, becoming rough. Isolated showers.

MONDAY
Northeast winds near 20 knots, decreasing to 15 to 20 knots. Seas 2 to 3 feet, except 3 to 5 feet, occasionally to 6 feet west of Cosgrove Shoal Light. Nearshore waters rough, becoming choppy. Scattered showers.

MONDAY NIGHT
Northeast winds 15 to 20 knots. Seas 2 to 3 feet. Nearshore waters choppy. Scattered showers.

TUESDAY
Northeast to east winds 15 to 20 knots, decreasing to near 15 knots. Seas 2 to 3 feet, except 3 to 4 feet west of Cosgrove Shoal Light. Nearshore waters choppy, becoming a moderate chop. Scattered showers.

TUESDAY NIGHT
Northeast to east winds near 15 knots, becoming east 10 to 15 knots. Seas 2 to 3 feet. Nearshore waters a moderate chop, becoming a light to moderate chop. Scattered showers and isolated thunderstorms.

WEDNESDAY
East to southeast winds near 10 knots, becoming south to southwest. Seas 1 to 2 feet. Nearshore waters a light chop. Scattered showers and isolated thunderstorms.

WEDNESDAY NIGHT
West to northwest winds 10 to 15 knots. Seas building to 2 to 3 feet, except building to 3 to 4 feet west of Cosgrove Shoal Light. Nearshore waters a light to moderate chop. Scattered showers and isolated thunderstorms.

THURSDAY
West to northwest winds 15 to 20 knots, increasing to near 20 knots. Seas 2 to 3 feet, building to 4 to 6 feet, occasionally to 8 feet. West of Cosgrove Shoal Light, seas 2 to 4 feet, occasionally to 5 feet, building to 6 to 8 feet, occasionally to 10 feet. Nearshore waters choppy, becoming rough. Scattered showers and isolated thunderstorms.

THURSDAY NIGHT
Northwest to north winds near 20 knots, becoming north 15 to 20 knots. Seas 4 to 6 feet, occasionally to 8 feet, except 7 to 10 feet, occasionally to 13 feet west of Cosgrove Shoal Light. Nearshore waters rough, becoming choppy. Isolated showers.

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GMZ052>055-072>075-110930
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
425 PM EST Sat Jan 10 2026

TONIGHT
Northeast to east winds 10 to 15 knots. Seas 2 to 4 feet, occasionally to 5 feet. Wave Detail: East 3 feet at 6 seconds. Isolated showers.

SUNDAY
Northeast to east winds near 10 knots, becoming north to northeast. Seas subsiding to around 2 feet. Wave Detail: East 3 feet at 5 seconds. Isolated showers.

SUNDAY NIGHT
North to northeast winds 10 to 15 knots, increasing to near 20 knots. Seas 2 to 3 feet, building to 4 to 6 feet, occasionally to 8 feet. Wave Detail: Northeast 3 feet at 4 seconds. Scattered showers and isolated thunderstorms.

MONDAY
Northeast winds 20 to 25 knots, decreasing to near 20 knots. Seas 4 to 7 feet, occasionally to 9 feet. Scattered showers and isolated thunderstorms.

MONDAY NIGHT
Northeast winds 15 to 20 knots, increasing to near 20 knots. Seas 4 to 6 feet, occasionally to 8 feet. Scattered showers and isolated thunderstorms.

TUESDAY
Northeast to east winds 15 to 20 knots, decreasing to near 15 knots. Seas 3 to 5 feet, occasionally to 6 feet. Scattered showers and isolated thunderstorms.

TUESDAY NIGHT
Northeast to east winds near 15 knots, becoming east to southeast 10 to 15 knots. Seas 3 to 4 feet, occasionally to 5 feet. Scattered showers and isolated thunderstorms.

WEDNESDAY
Southeast winds near 10 knots, becoming south to southwest. Seas 2 to 4 feet, subsiding to around 2 feet. Scattered showers and isolated thunderstorms.

WEDNESDAY NIGHT
West to northwest winds 10 to 15 knots. Seas building to 3 to 4 feet. Scattered showers and isolated thunderstorms.

THURSDAY
West to northwest winds 15 to 20 knots, increasing to near 20 knots. Seas 2 to 4 feet, occasionally to 5 feet, building to 5 to 8 feet, occasionally to 10 feet in the afternoon. Scattered showers and isolated thunderstorms.

THURSDAY NIGHT
Northwest to north winds 20 to 25 knots. Seas 6 to 9 feet, occasionally to 11 feet. Isolated showers.

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GMZ033-034-110930
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
425 PM EST Sat Jan 10 2026

TONIGHT
Northeast to east winds 5 to 10 knots, increasing to near 10 knots. Seas 1 to 2 feet. Wave Detail: East 2 feet at 4 seconds. Isolated showers.

SUNDAY
Northeast winds near 10 knots, becoming northwest to north. Seas 1 to 2 feet. Wave Detail: Northeast to east 1 foot at 3 seconds. Isolated showers.

SUNDAY NIGHT
North to northeast winds near 15 knots, increasing to 20 to 25 knots. Seas 1 to 2 feet, building to 3 to 5 feet, occasionally to 6 feet. Wave Detail: North 2 feet at 3 seconds, becoming north 4 feet at 5 seconds. Isolated showers.

MONDAY
Northeast winds 20 to 25 knots, decreasing to 15 to 20 knots. Seas 4 to 6 feet, occasionally to 8 feet. Isolated showers.

MONDAY NIGHT
North to northeast winds near 15 knots, increasing 15 to 20 knots. Seas 3 to 4 feet, occasionally to 5 feet, subsiding to 2 to 3 feet. Isolated showers.

TUESDAY
Northeast winds near 15 knots, decreasing to 10 to 15 knots. Seas 2 to 3 feet. Isolated showers.

TUESDAY NIGHT
Northeast to east winds 10 to 15 knots, decreasing to near 10 knots. Seas subsiding to 1 to 2 feet. Isolated showers and thunderstorms.

WEDNESDAY
Northeast to east winds 5 to 10 knots, becoming northwest to north near 10 knots. Seas 1 to 2 feet. Scattered showers and isolated thunderstorms.

WEDNESDAY NIGHT
West to northwest winds 10 to 15 knots, increasing to near 15 knots. Seas building to 3 to 4 feet, occasionally to 5 feet. Scattered showers and isolated thunderstorms.

THURSDAY
West winds 15 to 20 knots, becoming west to northwest 20 to 25 knots. Seas 2 to 4 feet, occasionally to 5 feet, building to 7 to 10 feet, occasionally to 13 feet in the afternoon. Scattered showers and isolated thunderstorms.

THURSDAY NIGHT
Northwest to north winds near 20 knots, decreasing to 15 to 20 knots. Seas 8 to 11 feet, occasionally to 14 feet, subsiding to 6 to 9 feet, occasionally to 11 feet after midnight. Isolated showers.