305
FZUS52 KKEY 082025
CWFKEY

Coastal Waters Forecast for the Florida Keys
National Weather Service Key West FL
425 PM EDT Tue Sep 8 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.

GMZ005-090830-
Synopsis for Keys coastal waters from Ocean Reef to Dry Tortugas
425 PM EDT Tue Sep 8 2026

.SYNOPSIS...
Florida Keys coastal waters will initially remain in a broad
nebulous pressure pattern this evening, leading to light and
variable winds. By early Wednesday, western extent of the
Atlantic Ridge will begin building in, allowing breezes to become
more easterly and freshen to gentle to moderate. Waves of low-
level moisture pushing across the Keys will support elevated rain
and thunder chances through Tuesday, possibly returning to near
normal by mid week.

The Approximate Shoreward Edge of the Gulf Stream as of September
2, 2026...

34 NM south-southwest of Dry Tortugas Light, on Loggerhead Key
34 NM south-southeast of Cosgrove Shoal Light, off the Marquesas Keys
26 NM south-southeast of Sand Key Light, off Key West
21 NM south-southeast of Looe Key, off Big Pine Key
17 NM southeast of Sombrero Key Light, off Marathon
10 NM southeast of Alligator Reef Light, off Islamorada
 6 NM east-southeast of Molasses Reef Light, off Key Largo
 1 NM east-southeast of Carysfort Reef Light, off Ocean Reef

This data courtesy of the Naval Oceanographic Office.

$$

GMZ031-090830-
Florida Bay including Barnes Sound, Blackwater Sound, and
Buttonwood Sound-
425 PM EDT Tue Sep 8 2026

.TONIGHT...Variable winds near 5 knots, becoming east winds 5 to
10 knots. Bay waters smooth, becoming smooth to a light chop. A
chance of showers with a slight chance of thunderstorms.
.WEDNESDAY...East winds near 10 knots. Bay waters a light chop. A
chance of showers with a slight chance of thunderstorms.
.WEDNESDAY NIGHT...East winds 10 to 15 knots. Bay waters a light
to moderate chop. A chance of showers with a slight chance of
thunderstorms.
.THURSDAY...East to southeast winds near 10 knots. Bay waters
a light chop. A chance of showers with a slight chance of
thunderstorms.
.THURSDAY NIGHT...East to southeast winds near 10 knots. Bay
waters a light chop. A chance of showers with a slight chance of
thunderstorms.
.FRIDAY...East to southeast winds 5 to 10 knots. Bay waters
smooth to a light chop. A chance of showers with a slight chance
of thunderstorms.
.FRIDAY NIGHT...East to southeast winds near 10 knots. Bay waters
a light chop. A chance of showers and thunderstorms.
.SATURDAY...East to southeast winds 5 to 10 knots. Bay waters
smooth to a light chop. Showers and thunderstorms likely.
.SATURDAY NIGHT...East to southeast winds 10 to 15 knots. Bay
waters a light to moderate chop. A chance of showers and
thunderstorms.
.SUNDAY...Southeast winds 5 to 10 knots. Bay waters smooth to a
light chop. Showers and thunderstorms likely.
.SUNDAY NIGHT...East to southeast winds 5 to 10 knots. Bay waters
smooth to a light chop. A chance of showers and thunderstorms.

$$

GMZ032-035-090830-
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 EDT Tue Sep 8 2026

.TONIGHT...Variable winds near 5 knots, becoming east 5 to 10
knots. Seas 1 foot or less. Nearshore waters smooth, becoming
smooth to a light chop. A chance of showers with a slight chance
of thunderstorms.
.WEDNESDAY...East winds 5 to 10 knots. Seas around 1 foot.
Nearshore waters smooth to a light chop. A chance of showers with
a slight chance of 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
with a slight chance of thunderstorms.
.THURSDAY...East to southeast winds near 10 knots. Seas around 1
foot. Nearshore waters a light chop. A chance of showers with a
slight chance of thunderstorms.
.THURSDAY NIGHT...East to southeast winds near 10 knots. Seas
around 1 foot. Nearshore waters a light chop. A chance of showers
with a slight chance of thunderstorms.
.FRIDAY...East to southeast winds 5 to 10 knots. Seas 1 foot or
less. Nearshore waters smooth to a light chop. A chance of
showers with a slight chance of thunderstorms.
.FRIDAY NIGHT...East to southeast winds near 10 knots. Seas around 1
foot. Nearshore waters a light chop. A chance of showers and
thunderstorms.
.SATURDAY...East to southeast winds 5 to 10 knots. Seas 1 foot or
less. Nearshore waters smooth to a light chop. A chance of
showers and thunderstorms.
.SATURDAY NIGHT...East to southeast winds 10 to 15 knots. Seas
1 to 2 feet. Nearshore waters a light to moderate chop. A chance
of showers and thunderstorms.
.SUNDAY...East to southeast winds 5 to 10 knots. Seas around 1
foot. Nearshore waters smooth to a light chop. Thunderstorms
likely. Showers likely.
.SUNDAY NIGHT...East to southeast winds near 10 knots. Seas 1 to
2 feet. Nearshore waters a light chop. A chance of showers and
thunderstorms.

$$

GMZ042>044-090830-
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 EDT Tue Sep 8 2026

.TONIGHT...Variable winds near 5 knots, becoming east 5 to 10
knots. Seas around 1 foot. Nearshore waters smooth, becoming
smooth to a light chop. A chance of showers with a slight chance
of thunderstorms.
.WEDNESDAY...East winds near 10 knots. Seas around 1 foot.
Nearshore waters a light chop. A chance of showers with a slight
chance of 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
with a slight chance of thunderstorms.
.THURSDAY...East to southeast winds around 10 knots. Seas 1 to 2
feet. Nearshore waters a light chop. A chance of showers with a
slight chance of thunderstorms.
.THURSDAY NIGHT...East to southeast winds 10 to 15 knots. Seas
1 to 2 feet. Nearshore waters a light to moderate chop. A chance
of showers with a slight chance of thunderstorms.
.FRIDAY...East to southeast winds 5 to 10 knots. Seas 1 to
2 feet. Nearshore waters smooth to a light chop. A chance of
showers with a slight chance of thunderstorms.
.FRIDAY NIGHT...East to southeast winds near 10 knots. Seas 1 to
2 feet. Nearshore waters a light chop. A chance of showers and
thunderstorms.
.SATURDAY...East to southeast winds near 10 knots. Seas 1 to 2
feet. Nearshore waters a light chop. A chance of showers and
thunderstorms.
.SATURDAY NIGHT...East to southeast winds 10 to 15 knots. Seas
1 to 2 feet. Nearshore waters a light to moderate chop. A chance
of showers and thunderstorms.
.SUNDAY...East to southeast winds 5 to 10 knots. Seas 1 to
2 feet. Nearshore waters smooth to a light chop. A chance of
thunderstorms. A chance of showers.
.SUNDAY NIGHT...East to southeast winds near 10 knots. Seas around
2 feet. Nearshore waters smooth to a light chop. A chance of
showers and thunderstorms.

$$

GMZ052>055-072>075-090830-
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 EDT Tue Sep 8 2026

.TONIGHT...East winds 5 to 10 knots. Seas around 1 foot. Wave
Detail: East 1 foot at 2 seconds. A slight chance of showers and
thunderstorms.
.WEDNESDAY...East winds near 10 knots. Seas 1 to 2 feet. Wave
Detail: East 2 feet at 4 seconds. A slight chance of showers and
thunderstorms.
.WEDNESDAY NIGHT...East winds 10 to 15 knots. Seas 2 to 3 feet.
Wave Detail: Northeast to east 3 feet at 4 seconds. A chance of
showers with a slight chance of thunderstorms.
.THURSDAY...East to southeast winds near 10 knots. Seas 2 to
3 feet. A chance of showers with a slight chance of
thunderstorms.
.THURSDAY NIGHT...East to southeast winds 10 to 15 knots. Seas
2 to 3 feet. A chance of showers with a slight chance of
thunderstorms.
.FRIDAY...East to southeast winds 5 to 10 knots. Seas around
2 feet. A chance of showers with a slight chance of
thunderstorms.
.FRIDAY NIGHT...East to southeast winds 10 to 15 knots. Seas
2 to 3 feet. A chance of showers and thunderstorms.
.SATURDAY...East to southeast winds near 10 knots. Seas around 2
feet. A chance of showers and thunderstorms.
.SATURDAY NIGHT...East to southeast winds 10 to 15 knots. Seas
2 to 3 feet. A chance of showers and thunderstorms.
.SUNDAY...East to southeast winds 5 to 10 knots. Seas around
2 feet. A chance of showers and thunderstorms.
.SUNDAY NIGHT...East to southeast winds near 10 knots. Seas 2 to
3 feet. A chance of thunderstorms with a slight chance of
showers.

$$

GMZ033-034-090830-
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 EDT Tue Sep 8 2026

.TONIGHT...East to southeast winds 5 to 10 knots. Seas 1 foot or
less. A chance of showers with a slight chance of thunderstorms.
.WEDNESDAY...East winds 5 to 10 knots. Seas around 1 foot. Wave
Detail: East to southeast 1 foot at 2 seconds. A chance of showers
with a slight chance of thunderstorms.
.WEDNESDAY NIGHT...East winds near 10 knots. Seas around 1 foot.
Wave Detail: Northeast to east 1 foot at 3 seconds. A chance of
showers with a slight chance of thunderstorms.
.THURSDAY...East to southeast winds 5 to 10 knots. Seas around
1 foot. A chance of showers with a slight chance of
thunderstorms.
.THURSDAY NIGHT...East to southeast winds increasing to around 10
knots. Seas around 1 foot. A chance of showers with a slight
chance of thunderstorms.
.FRIDAY...East to southeast winds 5 to 10 knots. Seas around
1 foot. A chance of showers with a slight chance of
thunderstorms.
.FRIDAY NIGHT...East to southeast winds near 10 knots. Seas
around 1 foot. A chance of showers and thunderstorms.
.SATURDAY...East to southeast winds 5 to 10 knots. Seas around
1 foot. A chance of showers and thunderstorms.
.SATURDAY NIGHT...East winds near 10 knots. Seas 1 to 2 feet. A
chance of showers and thunderstorms.
.SUNDAY...East to southeast winds 5 to 10 knots. Seas 1 to 2
feet. A chance of thunderstorms. A chance of showers.
.SUNDAY NIGHT...East to southeast winds near 10 knots. Seas around
2 feet. A chance of showers and thunderstorms.

$$