192
FZUS52 KKEY 080819
CWFKEY

Coastal Waters Forecast for the Florida Keys
National Weather Service Key West FL
419 AM 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.

GMZ005-082030-
Synopsis for Keys coastal waters from Ocean Reef to Dry Tortugas
419 AM EDT Tue Sep 8 2026

.SYNOPSIS...
Florida Keys coastal waters will be in a broad nebulous pressure
pattern. This will lead to light and at times variable breezes
through early Wednesday. During the day on Wednesday, the 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.

$$

GMZ031-082030-
Florida Bay including Barnes Sound, Blackwater Sound, and
Buttonwood Sound-
419 AM EDT Tue Sep 8 2026

.TODAY...Variable winds near 5 knots. Bay waters smooth. A chance
of showers with a slight chance of thunderstorms.
.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.

$$

GMZ032-035-082030-
Bayside and Gulf side from Craig Key to west end of Seven Mile
Bridge-
Gulf of Mexico from west end of Seven Mile Bridge to Halfmoon
Shoal out to 5 Fathoms-
419 AM EDT Tue Sep 8 2026

.TODAY...Variable winds near 5 knots. Seas 1 foot or less.
Nearshore waters smooth. A chance of showers with a slight chance
of thunderstorms.
.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 1 foot or less.
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 around 1 foot.
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
around 1 foot. Nearshore waters a light to moderate chop. A
chance of showers and thunderstorms.

$$

GMZ042>044-082030-
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-
419 AM EDT Tue Sep 8 2026

.TODAY...Variable winds near 5 knots. Seas 1 foot or less.
Nearshore waters smooth. A chance of showers with a slight chance
of thunderstorms.
.TONIGHT...Variable winds near 5 knots, becoming east near 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.

$$

GMZ052>055-072>075-082030-
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-
419 AM EDT Tue Sep 8 2026

.TODAY...Southeast to south winds near 5 knots, becoming east
around 5 knots late. Seas 1 foot or less. A chance of showers
with a slight chance of thunderstorms.
.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. 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.

$$

GMZ033-034-082030-
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-
419 AM EDT Tue Sep 8 2026

.TODAY...Variable winds near 5 knots. Seas 1 foot or less. A
chance of showers with a slight chance of thunderstorms.
.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.
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.

$$