National Weather Service Marine Forecast FZUS52 KKEY

FZUS52 KKEY 112022
CWFKEY

Coastal Waters Forecast for the Florida Keys
National Weather Service Key West FL
422 PM EDT Sun Oct 11 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.

The Wave Detail section highlights the period and direction of origin for the highest-energy waves, as well as any long-period swells moving in a different direction than the wind.

GMZ005-120830
Synopsis for Keys coastal waters from Ocean Reef to Dry Tortugas 422 PM EDT Sun Oct 11 2026

SYNOPSIS

A couple of nearby features will define the weather across the Florida Keys for the first half of the week. The Atlantic Ridge is gradually weakening and moving east towards the central Atlantic. Another weak high pressure system is located over the Gulf. Between the two pressure systems lies a weak frontal boundary that is set up across central Florida. The front is primed to pass across the Keys waters sometime early in the week, and promote gentle to moderate northeast to east breezes. Shower chances are forecast to be slight before mid-week before the previously mentioned front stalls near the Keys waters. Late in the week, there is a chance a strong cold front could develop and move towards the Florida Keys. Frontal passage with this cold front could occur over next weekend, and we will continue monitoring this system.

The Approximate Shoreward Edge of the Gulf Stream as of October 9, 2026...

53 NM south-southeast of Dry Tortugas Light, on Loggerhead Key 33 NM south-southeast of Cosgrove Shoal Light, off the Marquesas Keys 24 NM south-southeast of Sand Key Light, off Key West 19 NM south-southeast of Looe Key, off Big Pine Key 13 NM south-southeast of Sombrero Key Light, off Marathon 5 NM south-southeast of Alligator Reef Light, off Islamorada 2 NM east of Molasses Reef Light, off Key Largo 2 NM east of Carysfort Reef Light, off Ocean Reef

Gulf Stream Information Courtesy of the Naval Oceanographic Office.

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GMZ031-120830
Florida Bay including Barnes Sound, Blackwater Sound, and Buttonwood Sound
422 PM EDT Sun Oct 11 2026

TONIGHT
Northeast to east winds 5 to 10 knots. Bay waters smooth to a light chop. A slight chance of showers and thunderstorms.

MONDAY
Northeast to east winds 5 to 10 knots. Bay waters smooth to a light chop. A chance of showers with a slight chance of thunderstorms.

MONDAY NIGHT
Northeast winds near 10 knots, increasing to 10 to 15 knots. Bay waters a light chop, becoming a light to moderate chop. A slight chance of showers and thunderstorms.

TUESDAY
Northeast winds 10 to 15 knots. Bay waters a light to moderate chop.

TUESDAY NIGHT
Northeast winds 10 to 15 knots. Bay waters a light to moderate chop. A slight chance of showers.

WEDNESDAY
Northeast to east winds 10 to 15 knots. Bay waters a light to moderate chop. A chance of showers with a slight chance of thunderstorms.

WEDNESDAY NIGHT
Northeast to east winds 10 to 15 knots. Bay waters a light to moderate chop. A chance of showers and thunderstorms.

THURSDAY
East winds 10 to 15 knots. Bay waters a light to moderate chop. A chance of showers and thunderstorms.

THURSDAY NIGHT
East winds 10 to 15 knots, decreasing to near 10 knots. Bay waters a light to moderate chop, becoming a light chop. A chance of showers and thunderstorms.

FRIDAY
East to southeast winds 5 to 10 knots. Bay waters smooth to a light chop. A chance of showers and thunderstorms.

FRIDAY NIGHT
Northeast to east winds 5 to 10 knots. Bay waters smooth to a light chop. A chance of showers and thunderstorms.

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GMZ032-035-120830
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
422 PM EDT Sun Oct 11 2026

TONIGHT
Northeast to east winds near 10 knots. Seas 1 to 2 feet, except around 2 feet west of the Marquesas Keys. Nearshore waters a light chop. A slight chance of showers and thunderstorms.

MONDAY
Northeast winds near 10 knots, decreasing to 5 to 10 knots. Seas 1 to 2 feet, except around 2 feet west of the Marquesas Keys. Nearshore waters a light chop, becoming smooth to a light chop. A slight chance of showers and thunderstorms.

MONDAY NIGHT
Northeast winds near 10 knots, increasing to 10 to 15 knots. Seas 1 to 2 feet, except building to 2 to 3 feet west of the Marquesas Keys. Nearshore waters a light chop, becoming a light to moderate chop. A chance of showers with a slight chance of thunderstorms.

TUESDAY
Northeast winds 10 to 15 knots, decreasing to near 10 knots. Seas 1 to 2 feet, except around 2 feet west of the Marquesas Keys. Nearshore waters a light to moderate chop, becoming a light chop. A slight chance of showers.

TUESDAY NIGHT
Northeast winds to 10 to 15 knots, increasing to near 15 knots. Seas 1 to 2 feet, except 2 to 3 feet west of the Marquesas Keys. Nearshore waters a light to moderate chop, becoming a moderate chop. A slight chance of showers.

WEDNESDAY
Northeast to east winds near 15 knots, decreasing to 10 to 15 knots. Seas 1 to 2 feet, except 2 to 3 feet west of the Marquesas Keys. Nearshore waters a moderate chop, becoming a light to moderate chop. A slight chance of showers and thunderstorms.

WEDNESDAY NIGHT
East winds 10 to 15 knots. Seas 1 to 2 feet. Nearshore waters a light to moderate chop. A chance of showers and thunderstorms.

THURSDAY
East winds near 10 knots. Seas 1 to 2 feet. Nearshore waters a light chop. A chance of showers and thunderstorms.

THURSDAY NIGHT
East winds 10 to 15 knots. Seas 1 to 2 feet. Nearshore waters a light to moderate chop. A chance of showers and thunderstorms.

FRIDAY
East to southeast winds near 10 knots, decreasing to 5 to 10 knots. Seas around 1 foot. Nearshore waters a light chop, becoming smooth to a light chop. A chance of showers and thunderstorms.

FRIDAY NIGHT
East winds 5 to 10 knots. Seas 1 foot or less. Nearshore waters smooth to a light chop. A chance of showers and thunderstorms.

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GMZ042>044-120830
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
422 PM EDT Sun Oct 11 2026

TONIGHT
Northeast to east winds near 10 knots. Seas around 2 feet. Nearshore waters a light chop. A slight chance of showers and thunderstorms.

MONDAY
Northeast winds near 10 knots. Seas around 2 feet, subsiding to 1 to 2 feet. Nearshore waters a light chop. A slight chance of showers and thunderstorms.

MONDAY NIGHT
Northeast winds near 10 knots, increasing to 10 to 15 knots. Seas 1 to 2 feet, except building to 2 to 3 feet west of Cosgrove Shoal Light. Nearshore waters a light chop, becoming a light to moderate chop. A chance of showers with a slight chance of thunderstorms.

TUESDAY
Northeast winds 10 to 15 knots, increasing to near 15 knots. Seas building to around 2 feet, except building to 2 to 3 feet west of Cosgrove Shoal Light. Nearshore waters a light to moderate chop, becoming a moderate chop. A slight chance of showers.

TUESDAY NIGHT
Northeast to east winds near 15 knots. Seas 2 to 3 feet. Nearshore waters a moderate chop. A slight chance of showers.

WEDNESDAY
Northeast to east winds near 15 knots. Seas 2 to 3 feet. Nearshore waters a moderate chop. A chance of showers with a slight chance of thunderstorms.

WEDNESDAY NIGHT
East winds near 15 knots, decreasing to 10 to 15 knots. Seas around 2 feet. Nearshore waters a moderate chop, becoming a light to moderate chop. A chance of showers and thunderstorms.

THURSDAY
East winds 10 to 15 knots. Seas around 2 feet. Nearshore waters a light to moderate chop. A chance of showers and thunderstorms.

THURSDAY NIGHT
East winds 10 to 15 knots. Seas around 2 feet. Nearshore waters a light to moderate chop. A chance of showers and thunderstorms.

FRIDAY
East winds near 10 knots, decreasing to 5 to 10 knots. Seas 1 to 2 feet. Nearshore waters a light chop, becoming a smooth to a light chop. A chance of showers and thunderstorms.

FRIDAY NIGHT
East winds 5 to 10 knots. Seas around 1 foot. Nearshore waters smooth to a light chop. A chance of showers and thunderstorms.

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GMZ052>055-072>075-120830
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
422 PM EDT Sun Oct 11 2026

TONIGHT
Northeast to east winds 10 to 15 knots. Seas 2 to 3 feet. Wave Detail: Northeast to east 3 feet at 5 seconds and west 1 foot at 7 seconds. A slight chance of showers and thunderstorms.

MONDAY
Northeast winds 10 to 15 knots. Seas 2 to 3 feet. Wave Detail: Northeast to east 3 feet at 5 seconds and west to northwest 1 foot at 6 seconds. A slight chance of showers and thunderstorms.

MONDAY NIGHT
Northeast winds 10 to 15 knots. Seas 2 to 4 feet, occasionally to 5 feet. Wave Detail: Northeast 3 feet at 4 seconds. A chance of showers with a slight chance of thunderstorms.

TUESDAY
Northeast winds 10 to 15 knots, increasing to near 15 knots. Seas 2 to 4 feet, occasionally to 5 feet. A chance of showers with a slight chance of thunderstorms.

TUESDAY NIGHT
Northeast to east winds near 15 knots. Seas 3 to 4 feet, occasionally to 5 feet. A chance of showers with a slight chance of thunderstorms.

WEDNESDAY
Northeast to east winds near 15 knots, decreasing to 10 to 15 knots. Seas 2 to 4 feet, occasionally to 5 feet. A chance of showers with a slight chance of thunderstorms.

WEDNESDAY NIGHT
East winds 10 to 15 knots. Seas 2 to 3 feet. A chance of showers and thunderstorms.

THURSDAY
East winds 10 to 15 knots. Seas 2 to 3 feet. A chance of showers and thunderstorms.

THURSDAY NIGHT
East winds 10 to 15 knots. Seas 2 to 3 feet. A chance of showers and thunderstorms.

FRIDAY
East winds near 10 knots, decreasing to 5 to 10 knots. Seas around 2 feet. A chance of showers and thunderstorms.

FRIDAY NIGHT
East winds 5 to 10 knots. Seas 1 to 2 feet. A chance of showers and thunderstorms.

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GMZ033-034-120830
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
422 PM EDT Sun Oct 11 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 3 seconds and west to northwest 2 feet at 6 seconds. A slight chance of showers and thunderstorms.

MONDAY
North to northeast winds 10 to 15 knots. Seas around 2 feet, building to 2 to 3 feet. Wave Detail: Northeast to east 2 feet at 3 seconds and northwest 2 feet at 5 seconds. A slight chance of showers and thunderstorms.

MONDAY NIGHT
North to northeast winds 10 to 15 knots. Seas 2 to 3 feet. Wave Detail: North to northeast 3 feet at 5 seconds. A slight chance of showers and thunderstorms.

TUESDAY
North to northeast winds near 15 knots, decreasing to 10 to 15 knots. Seas 2 to 3 feet. A slight chance of showers.

TUESDAY NIGHT
Northeast to east winds 10 to 15 knots, increasing to near 15 knots. Seas 2 to 3 feet. A slight chance of showers.

WEDNESDAY
Northeast to east winds near 15 knots, decreasing to 10 to 15 knots. Seas 2 to 3 feet. A slight chance of showers.

WEDNESDAY NIGHT
Northeast to east winds 10 to 15 knots. Seas 2 to 3 feet. A chance of showers and thunderstorms.

THURSDAY
East winds 10 to 15 knots. Seas 1 to 3 feet. A chance of showers with a slight chance of thunderstorms.

THURSDAY NIGHT
East winds 10 to 15 knots. Seas around 2 feet. A chance of showers and thunderstorms.

FRIDAY
East winds near 10 knots. Seas 1 to 2 feet. A chance of showers and thunderstorms.

FRIDAY NIGHT
East winds 5 to 10 knots. Seas around 1 foot. A chance of showers and thunderstorms.

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AJP