FZUS52 KKEY 201431
CWFKEY
Coastal Waters Forecast for the Florida Keys
National Weather Service Key West FL
1031 AM EDT Sun Sep 20 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.
GMZ005-210245-
Synopsis for Keys coastal waters from Ocean Reef to Dry Tortugas
1031 AM EDT Sun Sep 20 2026
.SYNOPSIS...
Light to gentle mainly southerly breezes will be in place through
the remainder of the weekend, though a period of variable breezes
are expected late this afternoon and evening. In addition, a wet
weather pattern will persist across the Florida Keys coastal
waters into the new week as an upper- level low lingers in the
eastern Gulf waters. As a result, scattered to numerous showers
and thunderstorms will be a daily occurence with gusty winds,
lightning strikes, blinding downpours, and locally hazardous seas
the main hazards. Breezes will generally remain light to gentle
into the new week but brief periods of moderate breezes may occur
in the evening hours.
The Approximate Shoreward Edge of the Gulf Stream as of September
15, 2026...
64 NM south-southeast of Dry Tortugas Light, on Loggerhead Key
40 NM south-southeast of Cosgrove Shoal Light, off the Marquesas Keys
36 NM south-southeast of Sand Key Light, off Key West
35 NM southeast of Looe Key, off Big Pine Key
28 NM southeast of Sombrero Key Light, off Marathon
15 NM east-southeast of Alligator Reef Light, off Islamorada
8 NM east-southeast of Molasses Reef Light, off Key Largo
5 NM east-southeast of Carysfort Reef Light, off Ocean Reef
Gulf Stream Information Courtesy of the Naval Oceanographic Office.
$$
GMZ031-210245-
Florida Bay including Barnes Sound, Blackwater Sound, and
Buttonwood Sound-
1031 AM EDT Sun Sep 20 2026
.THIS AFTERNOON...Variable winds near 5 knots, becoming south to
southwest late this morning and afternoon. Bay waters smooth. A
chance of thunderstorms. Showers likely with a chance of
thunderstorms.
.TONIGHT...Southeast to south winds near 5 knots, becoming south
and increasing to 5 to 10 knots. Bay waters smooth, becoming
smooth to a light chop. A chance of showers and thunderstorms.
.MONDAY...South to southwest winds 5 to 10 knots. Bay waters
smooth to a light chop. Showers likely with a chance of
thunderstorms.
.MONDAY NIGHT...South winds 5 to 10 knots. Bay waters smooth to a
light chop. Showers likely with a chance of thunderstorms.
.TUESDAY...Southeast to south winds 5 to 10 knots. Bay waters
smooth to a light chop. Showers likely with a chance of
thunderstorms.
.TUESDAY NIGHT AND WEDNESDAY...Southeast to south winds 5 to 10
knots. Bay waters smooth to a light chop. Showers likely with a
chance of thunderstorms.
.WEDNESDAY NIGHT...Southeast to south winds near 5 knots. Bay
waters smooth. A chance of showers and thunderstorms.
.THURSDAY...Northeast winds near 5 knots, becoming south. Bay
waters smooth. Showers likely with a chance of thunderstorms.
.THURSDAY NIGHT...Southeast winds near 5 knots, becoming north.
Bay waters smooth. A chance of showers and thunderstorms.
$$
GMZ032-035-210245-
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-
1031 AM EDT Sun Sep 20 2026
.THIS AFTERNOON...Southeast to south winds near 5 knots, becoming
southwest early, then becoming light and variable late. Seas
1 foot or less. Nearshore waters smooth. Showers likely with a
chance of thunderstorms.
.TONIGHT...Southeast to south winds near 5 knots, becoming south.
Seas 1 foot or less. Nearshore waters smooth. Showers likely with
a chance of thunderstorms.
.MONDAY...South to southwest winds 5 to 10 knots. Seas around 1
foot. Nearshore waters smooth to a light chop. Showers likely
with a chance of thunderstorms.
.MONDAY NIGHT...South winds 5 to 10 knots. Seas around 1 foot.
Nearshore waters smooth to a light chop. Showers likely with a
chance of thunderstorms.
.TUESDAY...Southeast to south winds 5 to 10 knots. Seas around 1
foot. Nearshore waters smooth to a light chop. Showers likely
with a chance of thunderstorms.
.TUESDAY NIGHT AND WEDNESDAY...Southeast to south winds 5 to 10
knots. Seas around 1 foot. Nearshore waters smooth to a light
chop. Showers likely with a chance of thunderstorms.
.WEDNESDAY NIGHT...Southeast to south winds near 5 knots. Seas
1 foot or less. Nearshore waters smooth. Showers likely with a
chance of thunderstorms.
.THURSDAY...Southeast to south winds near 5 knots. Seas 1 foot or
less. Nearshore waters smooth. Showers likely with a chance of
thunderstorms.
.THURSDAY NIGHT...East to southeast winds near 5 knots. Seas
1 foot or less. Nearshore waters smooth. A chance of showers and
thunderstorms.
$$
GMZ042>044-210245-
Hawk Channel from Ocean Reef to Craig Key out to the reef-
Hawk Channel from Craig Key to west end of Seven Mile Bridge out
to the reef-
Hawk Channel from west end of Seven Mile Bridge to Halfmoon Shoal
out to the reef-
1031 AM EDT Sun Sep 20 2026
.THIS AFTERNOON...Winds becoming south to southwest near 5 knots.
Seas 1 foot or less. Nearshore waters smooth. Showers likely with
a chance of thunderstorms.
.TONIGHT...South winds near 5 knots, increasing to 5 to 10 knots.
Seas around 1 foot. Nearshore waters smooth, becoming smooth to a
light chop. Showers likely with a chance of thunderstorms.
.MONDAY...South to southwest winds 5 to 10 knots. Seas around
1 foot. Nearshore waters smooth to a light chop. A chance of
showers and thunderstorms.
.MONDAY NIGHT...South winds 5 to 10 knots. Seas around 1 foot.
Nearshore waters smooth to a light chop. Showers likely with a
chance of thunderstorms.
.TUESDAY...Southeast to south winds 5 to 10 knots. Seas around
1 foot. Nearshore waters smooth to a light chop. Showers likely
with a chance of thunderstorms.
.TUESDAY NIGHT THROUGH WEDNESDAY NIGHT...Southeast to south winds
5 to 10 knots. Seas around 1 foot. Nearshore waters smooth to a
light chop. Showers likely with a chance of thunderstorms.
.THURSDAY...Southeast to south winds near 5 knots. Seas around
1 foot. Nearshore waters smooth. Showers likely with a chance of
thunderstorms.
.THURSDAY NIGHT...Southeast to south winds near 5 knots. Seas
around 1 foot. Nearshore waters smooth. A chance of showers and
thunderstorms.
$$
GMZ052>055-072>075-210245-
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-
1031 AM EDT Sun Sep 20 2026
.THIS AFTERNOON...South to southwest winds near 5 knots. Seas
around 1 foot. Wave Detail: Southeast 1 foot at 3 seconds. Showers
likely with a chance of thunderstorms.
.TONIGHT...South winds 5 to 10 knots. Seas 1 to 2 feet. Wave
Detail: Southeast to south 1 foot at 3 seconds. Showers likely
with a chance of thunderstorms.
.MONDAY...Southwest winds 5 to 10 knots. Seas 1 to 2 feet. Wave
Detail: Southeast to south 1 foot at 3 seconds. A chance of
showers and thunderstorms.
.MONDAY NIGHT...Southeast to south winds 5 to 10 knots,
increasing to 10 to 15 knots. Seas 1 to 2 feet, building to 2 to 3
feet. Showers likely with a chance of thunderstorms.
.TUESDAY...Southeast to south winds 5 to 10 knots. Seas 1 to 2
feet. Showers likely with a chance of thunderstorms.
.TUESDAY NIGHT...Southeast to south winds 5 to 10 knots. Seas 1 to
2 feet. Showers likely with a chance of thunderstorms.
.WEDNESDAY...Southeast to south winds 5 to 10 knots. Seas 1 to 2
feet. Showers with a chance of thunderstorms.
.WEDNESDAY NIGHT...Southeast winds 5 to 10 knots. Seas 1 to 2 feet.
Showers likely with a chance of thunderstorms.
.THURSDAY...Southeast to south winds 5 to 10 knots. Seas around
1 foot. Showers likely with a chance of thunderstorms.
.THURSDAY NIGHT...Southeast to south winds near 5 knots. Seas
around 1 foot. A chance of showers and thunderstorms.
$$
GMZ033-034-210245-
Gulf of America from East Cape Sable to Chokoloskee 20 to 60 NM
out and beyond 5 fathoms-
Gulf of America including Dry Tortugas and Rebecca Shoal Channel-
1031 AM EDT Sun Sep 20 2026
.THIS AFTERNOON...South winds near 5 knots until late afternoon,
becoming light and variable. Seas 1 foot or less. Wave Detail:
South 1 foot at 2 seconds. Showers likely with a chance of
thunderstorms.
.TONIGHT...East to southeast winds near 5 knots, becoming south.
Seas 1 foot or less. Wave Detail: South 1 foot at 3 seconds.
Showers likely with a chance of thunderstorms.
.MONDAY...South to southwest winds near 5 knots. Seas 1 foot or
less. Wave Detail: South 1 foot at 3 seconds. A chance of showers
and thunderstorms.
.MONDAY NIGHT...Southeast to south winds 5 to 10 knots. Seas
around 1 foot. Showers likely with a chance of thunderstorms.
.TUESDAY...South winds 5 to 10 knots. Seas around 1 foot. Showers
likely with a chance of thunderstorms.
.TUESDAY NIGHT...Southeast to south winds 5 to 10 knots. Seas
around 1 foot. Showers likely with a chance of thunderstorms.
.WEDNESDAY...Southeast to south winds 5 to 10 knots. Seas around
1 foot. Showers likely with a chance of thunderstorms.
.WEDNESDAY NIGHT...Southeast winds 5 to 10 knots. Seas around
1 foot. A chance of thunderstorms. A chance of showers.
.THURSDAY...East to southeast winds near 5 knots. Seas 1 foot or
less. A chance of thunderstorms. Showers likely.
.THURSDAY NIGHT...East winds near 5 knots. Seas 1 foot or less. A
chance of showers and thunderstorms.
$$
CLR
CWFKEY
Coastal Waters Forecast for the Florida Keys
National Weather Service Key West FL
1031 AM EDT Sun Sep 20 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.
GMZ005-210245-
Synopsis for Keys coastal waters from Ocean Reef to Dry Tortugas
1031 AM EDT Sun Sep 20 2026
.SYNOPSIS...
Light to gentle mainly southerly breezes will be in place through
the remainder of the weekend, though a period of variable breezes
are expected late this afternoon and evening. In addition, a wet
weather pattern will persist across the Florida Keys coastal
waters into the new week as an upper- level low lingers in the
eastern Gulf waters. As a result, scattered to numerous showers
and thunderstorms will be a daily occurence with gusty winds,
lightning strikes, blinding downpours, and locally hazardous seas
the main hazards. Breezes will generally remain light to gentle
into the new week but brief periods of moderate breezes may occur
in the evening hours.
The Approximate Shoreward Edge of the Gulf Stream as of September
15, 2026...
64 NM south-southeast of Dry Tortugas Light, on Loggerhead Key
40 NM south-southeast of Cosgrove Shoal Light, off the Marquesas Keys
36 NM south-southeast of Sand Key Light, off Key West
35 NM southeast of Looe Key, off Big Pine Key
28 NM southeast of Sombrero Key Light, off Marathon
15 NM east-southeast of Alligator Reef Light, off Islamorada
8 NM east-southeast of Molasses Reef Light, off Key Largo
5 NM east-southeast of Carysfort Reef Light, off Ocean Reef
Gulf Stream Information Courtesy of the Naval Oceanographic Office.
$$
GMZ031-210245-
Florida Bay including Barnes Sound, Blackwater Sound, and
Buttonwood Sound-
1031 AM EDT Sun Sep 20 2026
.THIS AFTERNOON...Variable winds near 5 knots, becoming south to
southwest late this morning and afternoon. Bay waters smooth. A
chance of thunderstorms. Showers likely with a chance of
thunderstorms.
.TONIGHT...Southeast to south winds near 5 knots, becoming south
and increasing to 5 to 10 knots. Bay waters smooth, becoming
smooth to a light chop. A chance of showers and thunderstorms.
.MONDAY...South to southwest winds 5 to 10 knots. Bay waters
smooth to a light chop. Showers likely with a chance of
thunderstorms.
.MONDAY NIGHT...South winds 5 to 10 knots. Bay waters smooth to a
light chop. Showers likely with a chance of thunderstorms.
.TUESDAY...Southeast to south winds 5 to 10 knots. Bay waters
smooth to a light chop. Showers likely with a chance of
thunderstorms.
.TUESDAY NIGHT AND WEDNESDAY...Southeast to south winds 5 to 10
knots. Bay waters smooth to a light chop. Showers likely with a
chance of thunderstorms.
.WEDNESDAY NIGHT...Southeast to south winds near 5 knots. Bay
waters smooth. A chance of showers and thunderstorms.
.THURSDAY...Northeast winds near 5 knots, becoming south. Bay
waters smooth. Showers likely with a chance of thunderstorms.
.THURSDAY NIGHT...Southeast winds near 5 knots, becoming north.
Bay waters smooth. A chance of showers and thunderstorms.
$$
GMZ032-035-210245-
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-
1031 AM EDT Sun Sep 20 2026
.THIS AFTERNOON...Southeast to south winds near 5 knots, becoming
southwest early, then becoming light and variable late. Seas
1 foot or less. Nearshore waters smooth. Showers likely with a
chance of thunderstorms.
.TONIGHT...Southeast to south winds near 5 knots, becoming south.
Seas 1 foot or less. Nearshore waters smooth. Showers likely with
a chance of thunderstorms.
.MONDAY...South to southwest winds 5 to 10 knots. Seas around 1
foot. Nearshore waters smooth to a light chop. Showers likely
with a chance of thunderstorms.
.MONDAY NIGHT...South winds 5 to 10 knots. Seas around 1 foot.
Nearshore waters smooth to a light chop. Showers likely with a
chance of thunderstorms.
.TUESDAY...Southeast to south winds 5 to 10 knots. Seas around 1
foot. Nearshore waters smooth to a light chop. Showers likely
with a chance of thunderstorms.
.TUESDAY NIGHT AND WEDNESDAY...Southeast to south winds 5 to 10
knots. Seas around 1 foot. Nearshore waters smooth to a light
chop. Showers likely with a chance of thunderstorms.
.WEDNESDAY NIGHT...Southeast to south winds near 5 knots. Seas
1 foot or less. Nearshore waters smooth. Showers likely with a
chance of thunderstorms.
.THURSDAY...Southeast to south winds near 5 knots. Seas 1 foot or
less. Nearshore waters smooth. Showers likely with a chance of
thunderstorms.
.THURSDAY NIGHT...East to southeast winds near 5 knots. Seas
1 foot or less. Nearshore waters smooth. A chance of showers and
thunderstorms.
$$
GMZ042>044-210245-
Hawk Channel from Ocean Reef to Craig Key out to the reef-
Hawk Channel from Craig Key to west end of Seven Mile Bridge out
to the reef-
Hawk Channel from west end of Seven Mile Bridge to Halfmoon Shoal
out to the reef-
1031 AM EDT Sun Sep 20 2026
.THIS AFTERNOON...Winds becoming south to southwest near 5 knots.
Seas 1 foot or less. Nearshore waters smooth. Showers likely with
a chance of thunderstorms.
.TONIGHT...South winds near 5 knots, increasing to 5 to 10 knots.
Seas around 1 foot. Nearshore waters smooth, becoming smooth to a
light chop. Showers likely with a chance of thunderstorms.
.MONDAY...South to southwest winds 5 to 10 knots. Seas around
1 foot. Nearshore waters smooth to a light chop. A chance of
showers and thunderstorms.
.MONDAY NIGHT...South winds 5 to 10 knots. Seas around 1 foot.
Nearshore waters smooth to a light chop. Showers likely with a
chance of thunderstorms.
.TUESDAY...Southeast to south winds 5 to 10 knots. Seas around
1 foot. Nearshore waters smooth to a light chop. Showers likely
with a chance of thunderstorms.
.TUESDAY NIGHT THROUGH WEDNESDAY NIGHT...Southeast to south winds
5 to 10 knots. Seas around 1 foot. Nearshore waters smooth to a
light chop. Showers likely with a chance of thunderstorms.
.THURSDAY...Southeast to south winds near 5 knots. Seas around
1 foot. Nearshore waters smooth. Showers likely with a chance of
thunderstorms.
.THURSDAY NIGHT...Southeast to south winds near 5 knots. Seas
around 1 foot. Nearshore waters smooth. A chance of showers and
thunderstorms.
$$
GMZ052>055-072>075-210245-
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-
1031 AM EDT Sun Sep 20 2026
.THIS AFTERNOON...South to southwest winds near 5 knots. Seas
around 1 foot. Wave Detail: Southeast 1 foot at 3 seconds. Showers
likely with a chance of thunderstorms.
.TONIGHT...South winds 5 to 10 knots. Seas 1 to 2 feet. Wave
Detail: Southeast to south 1 foot at 3 seconds. Showers likely
with a chance of thunderstorms.
.MONDAY...Southwest winds 5 to 10 knots. Seas 1 to 2 feet. Wave
Detail: Southeast to south 1 foot at 3 seconds. A chance of
showers and thunderstorms.
.MONDAY NIGHT...Southeast to south winds 5 to 10 knots,
increasing to 10 to 15 knots. Seas 1 to 2 feet, building to 2 to 3
feet. Showers likely with a chance of thunderstorms.
.TUESDAY...Southeast to south winds 5 to 10 knots. Seas 1 to 2
feet. Showers likely with a chance of thunderstorms.
.TUESDAY NIGHT...Southeast to south winds 5 to 10 knots. Seas 1 to
2 feet. Showers likely with a chance of thunderstorms.
.WEDNESDAY...Southeast to south winds 5 to 10 knots. Seas 1 to 2
feet. Showers with a chance of thunderstorms.
.WEDNESDAY NIGHT...Southeast winds 5 to 10 knots. Seas 1 to 2 feet.
Showers likely with a chance of thunderstorms.
.THURSDAY...Southeast to south winds 5 to 10 knots. Seas around
1 foot. Showers likely with a chance of thunderstorms.
.THURSDAY NIGHT...Southeast to south winds near 5 knots. Seas
around 1 foot. A chance of showers and thunderstorms.
$$
GMZ033-034-210245-
Gulf of America from East Cape Sable to Chokoloskee 20 to 60 NM
out and beyond 5 fathoms-
Gulf of America including Dry Tortugas and Rebecca Shoal Channel-
1031 AM EDT Sun Sep 20 2026
.THIS AFTERNOON...South winds near 5 knots until late afternoon,
becoming light and variable. Seas 1 foot or less. Wave Detail:
South 1 foot at 2 seconds. Showers likely with a chance of
thunderstorms.
.TONIGHT...East to southeast winds near 5 knots, becoming south.
Seas 1 foot or less. Wave Detail: South 1 foot at 3 seconds.
Showers likely with a chance of thunderstorms.
.MONDAY...South to southwest winds near 5 knots. Seas 1 foot or
less. Wave Detail: South 1 foot at 3 seconds. A chance of showers
and thunderstorms.
.MONDAY NIGHT...Southeast to south winds 5 to 10 knots. Seas
around 1 foot. Showers likely with a chance of thunderstorms.
.TUESDAY...South winds 5 to 10 knots. Seas around 1 foot. Showers
likely with a chance of thunderstorms.
.TUESDAY NIGHT...Southeast to south winds 5 to 10 knots. Seas
around 1 foot. Showers likely with a chance of thunderstorms.
.WEDNESDAY...Southeast to south winds 5 to 10 knots. Seas around
1 foot. Showers likely with a chance of thunderstorms.
.WEDNESDAY NIGHT...Southeast winds 5 to 10 knots. Seas around
1 foot. A chance of thunderstorms. A chance of showers.
.THURSDAY...East to southeast winds near 5 knots. Seas 1 foot or
less. A chance of thunderstorms. Showers likely.
.THURSDAY NIGHT...East winds near 5 knots. Seas 1 foot or less. A
chance of showers and thunderstorms.
$$
CLR