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FZUS52 KKEY 231437
CWFKEY

Coastal Waters Forecast for the Florida Keys
National Weather Service Key West FL
1037 AM EDT Tue Sep 23 2025

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.

GMZ005-240245-
Synopsis for Keys coastal waters from Ocean Reef to Dry Tortugas
1037 AM EDT Tue Sep 23 2025

.SYNOPSIS...Rain and thunder chances will remain elevated through
the rest of today as a moisture surge and low-level trough
continue to push through the Florida Keys marine zones. High
pressure pushing off the Eastern Seaboard will support light to
gentle breezes through the rest of the work week, along with a
return to near normal rain chances for tonight through Saturday.

The Approximate Shoreward Edge of the Gulf Stream as of September
16...

53 NM South of Dry Tortugas Light...on Loggerhead Key.
40 NM South of Cosgrove Shoal Light...off the Marquesas Keys.
32 NM South of Sand Key Light...off Key West.
15 NM South of Looe Key...off Big Pine Key.
17 NM Southeast of Sombrero Key Light...off Marathon.
14 NM Southeast of Alligator Reef Light...off Islamorada.
13 NM Southeast of Molasses Reef Light...off Key Largo.
 9 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.

$$

GMZ031-240245-
Florida Bay including Barnes Sound, Blackwater Sound, and
Buttonwood Sound-
1037 AM EDT Tue Sep 23 2025

.THIS AFTERNOON...East to southeast winds 5 to 10 knots, becoming
east and decreasing to near 5 knots. Bay waters smooth to a light
chop, becoming smooth. Numerous showers and scattered
thunderstorms.
.TONIGHT...Northeast to east winds 5 to 10 knots, increasing to
near 10 knots. Bay waters smooth to a light chop, becoming a
light chop. Scattered showers and isolated thunderstorms.
.WEDNESDAY...Northeast to east winds 5 to 10 knots. Bay waters
smooth to a light chop. Scattered showers and isolated
thunderstorms.
.WEDNESDAY NIGHT...Northeast to east winds 5 to 10 knots. Bay
waters smooth to a light chop. Isolated showers and
thunderstorms.
.THURSDAY...Northeast to east winds near 5 knots, becoming
variable. Bay waters smooth. Scattered showers and isolated
thunderstorms.
.THURSDAY NIGHT...Variable winds near 5 knots. Bay waters smooth.
Scattered showers and isolated thunderstorms.
.FRIDAY...Variable winds near 5 knots. Bay waters smooth.
Scattered showers and isolated thunderstorms.
.FRIDAY NIGHT...West to northwest winds near 5 knots, becoming
north to northeast. Bay waters smooth. Scattered showers and
isolated thunderstorms.
.SATURDAY...Northwest to north winds near 5 knots, becoming west
to northwest and increasing to 5 to 10 knots. Bay waters smooth,
becoming smooth to a light chop. Scattered showers and isolated
thunderstorms.
.SATURDAY NIGHT...Northwest to north winds 5 to 10 knots,
becoming north to northeast. Bay waters smooth to a light chop.
Scattered showers and isolated thunderstorms.

$$

GMZ032-035-240245-
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-
1037 AM EDT Tue Sep 23 2025

.THIS AFTERNOON...East to southeast winds 5 to 10 knots. Seas
around 1 foot. Nearshore waters smooth to a light chop. Numerous
showers and scattered thunderstorms.
.TONIGHT...Northeast to east winds 5 to 10 knots, increasing to
10 to 15 knots after midnight. Seas 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 to moderate chop.
Scattered showers and isolated thunderstorms.
.WEDNESDAY...Northeast to east winds near 10 knots, decreasing to
near 5 knots. Seas around 1 foot, subsiding to 1 foot or less.
Nearshore waters a light chop, becoming smooth. Scattered showers
and isolated thunderstorms.
.WEDNESDAY NIGHT...Northeast to east winds 5 to 10 knots. Seas 1
foot or less. Nearshore waters smooth to a light chop. Scattered
showers and isolated thunderstorms.
.THURSDAY...Northeast to east winds near 5 knots, becoming
variable. Seas 1 foot or less. Nearshore waters smooth. Scattered
showers and isolated thunderstorms.
.THURSDAY NIGHT...Variable winds near 5 knots. Seas 1 foot or
less. Nearshore waters smooth. Scattered showers and isolated
thunderstorms.
.FRIDAY...Variable winds near 5 knots. Seas 1 foot or less.
Nearshore waters smooth. Scattered showers and isolated
thunderstorms.
.FRIDAY NIGHT...Northwest to north winds near 5 knots, becoming
north to northeast. Seas 1 foot or less. Nearshore waters smooth.
Scattered showers and isolated thunderstorms.
.SATURDAY...Northwest to north winds near 5 knots, increasing to 5
to 10 knots. Seas 1 foot or less. Nearshore waters smooth,
becoming smooth to a light chop. Scattered showers and isolated
thunderstorms.
.SATURDAY NIGHT...Northwest to north winds near 10 knots,
becoming north to northeast. Seas around 1 foot. Nearshore waters
a light chop. Scattered showers and isolated thunderstorms.

$$

GMZ042>044-240245-
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-
1037 AM EDT Tue Sep 23 2025

.THIS AFTERNOON...East to southeast winds near 10 knots, becoming
east and decreasing to near 5 knots. Seas 1 to 2 feet, subsiding
to around 1 foot. Nearshore waters a light chop, becoming smooth.
Numerous showers and scattered thunderstorms.
.TONIGHT...Northeast to east winds 5 to 10 knots, increasing to 10
to 15 knots after midnight. Seas around 1 foot, building to 1 to
2 feet. Nearshore waters smooth to a light chop, becoming a light
to moderate chop. Scattered showers and isolated thunderstorms.
.WEDNESDAY...Northeast to east winds near 10 knots, decreasing to
near 5 knots. Seas 1 to 2 feet, subsiding to around 1 foot.
Nearshore waters a light chop, becoming smooth. Scattered showers
and isolated thunderstorms.
.WEDNESDAY NIGHT...Northeast to east winds 5 to 10 knots. Seas
around 1 foot. Nearshore waters smooth to a light chop. Scattered
showers and isolated thunderstorms.
.THURSDAY...Northeast to east winds near 5 knots, becoming
variable. Seas 1 foot or less. Nearshore waters smooth. Isolated
showers and thunderstorms.
.THURSDAY NIGHT...Variable winds near 5 knots. Seas 1 foot or
less. Nearshore waters smooth. Isolated showers and
thunderstorms.
.FRIDAY...Variable winds near 5 knots. Seas 1 foot or less.
Nearshore waters smooth. Isolated showers and thunderstorms.
.FRIDAY NIGHT...Northwest to north winds near 5 knots, becoming
north to northeast. Seas 1 foot or less. Nearshore waters smooth.
Scattered showers and isolated thunderstorms.
.SATURDAY...Northwest to north winds near 5 knots, increasing to 5
to 10 knots. Seas 1 foot or less. Nearshore waters smooth,
becoming smooth to a light chop. Isolated showers and
thunderstorms.
.SATURDAY NIGHT...Northwest to north winds 5 to 10 knots, becoming
north to northeast. Seas around 1 foot. Nearshore waters smooth
to a light chop. Isolated showers and thunderstorms.

$$

GMZ052>055-072>075-240245-
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-
1037 AM EDT Tue Sep 23 2025

.THIS AFTERNOON...East to southeast winds near 10 knots, becoming
northeast to east and decreasing to 5 to 10 knots. Seas 1 to 3
feet, subsiding to 1 to 2 feet. Wave Detail: East to southeast 2
feet at 4 seconds. Scattered showers and thunderstorms.
.TONIGHT...Northeast to east winds 5 to 10 knots, increasing to
near 10 knots. Seas 1 to 2 feet, building to around 2 feet. Wave
Detail: East 1 foot at 4 seconds. Scattered showers and isolated
thunderstorms.
.WEDNESDAY...Northeast to east winds near 10 knots, decreasing to
5 to 10 knots. Seas around 2 feet. Wave Detail: East 1 foot at 4
seconds. Scattered showers and isolated thunderstorms.
.WEDNESDAY NIGHT...Northeast to east winds near 10 knots. Seas
around 2 feet. Scattered showers and isolated thunderstorms.
.THURSDAY...Northeast to east winds 5 to 10 knots. Seas 1 to 2
feet. Scattered showers and isolated thunderstorms.
.THURSDAY NIGHT...Northeast winds near 5 knots. Seas 1 to 2 feet.
Isolated showers and thunderstorms.
.FRIDAY...Northeast winds near 5 knots. Seas 1 to 2 feet.
Isolated showers and thunderstorms.
.FRIDAY NIGHT...Northeast winds 5 to 10 knots. Seas 1 to 2 feet.
Isolated showers and thunderstorms.
.SATURDAY...North winds near 5 knots, becoming northwest to north
and increasing to 5 to 10 knots. Seas 1 to 2 feet. Isolated
showers and thunderstorms.
.SATURDAY NIGHT...Northwest to north winds 5 to 10 knots, becoming
north to northeast. Seas 1 to 2 feet. Isolated showers and
thunderstorms.

$$

GMZ033-034-240245-
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-
1037 AM EDT Tue Sep 23 2025

.THIS AFTERNOON...East to southeast winds near 10 knots, becoming
east and decreasing to near 5 knots. Seas 1 to 2 feet, subsiding
to around 1 foot. Wave Detail: Southeast 1 foot at 4 seconds and
northwest to north 1 foot at 4 seconds. Numerous showers and
scattered thunderstorms.
.TONIGHT...Northeast to east winds 5 to 10 knots, increasing to
near 10 knots. Seas around 1 foot. Wave Detail: East to southeast
1 foot at 3 seconds. Scattered showers and isolated
thunderstorms.
.WEDNESDAY...Northeast to east winds 5 to 10 knots. Seas around 1
foot. Wave Detail: East 1 foot at 2 seconds. Scattered showers
and isolated thunderstorms.
.WEDNESDAY NIGHT...North to northeast winds 5 to 10 knots,
becoming northeast to east. Seas around 1 foot. Scattered showers
and isolated thunderstorms.
.THURSDAY...Northeast to east winds near 5 knots, becoming north
to northeast. Seas 1 foot or less. Isolated showers and
thunderstorms.
.THURSDAY NIGHT...North winds near 5 knots. Seas 1 foot or less.
Isolated showers and thunderstorms.
.FRIDAY...North winds near 5 knots. Seas 1 foot or less. Isolated
showers and thunderstorms.
.FRIDAY NIGHT...North winds 5 to 10 knots, becoming north to
northeast. Seas around 1 foot. Scattered showers and isolated
thunderstorms.
.SATURDAY...Northwest to north winds 5 to 10 knots. Seas around
1 foot. Scattered showers and isolated thunderstorms.
.SATURDAY NIGHT...North winds 5 to 10 knots. Seas around 1 foot.
Scattered showers and isolated thunderstorms.

$$

DP/MJV