856
FZUS52 KKEY 062021
CWFKEY

Coastal Waters Forecast for the Florida Keys
National Weather Service Key West FL
421 PM EDT Sun Sep 6 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.

GMZ005-070830-
Synopsis for Keys coastal waters from Ocean Reef to Dry Tortugas
421 PM EDT Sun Sep 6 2026

.SYNOPSIS...
Light to gentle southeast breezes will prevail through mid week,
as weak steering flow persists across the region. Thereafter,
breezes will freshen to gentle to moderate, as high pressure
builds in. 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.

$$

GMZ031-070830-
Florida Bay including Barnes Sound, Blackwater Sound, and
Buttonwood Sound-
421 PM EDT Sun Sep 6 2026

.TONIGHT...Variable winds near 5 knots, becoming southeast to
south. Bay waters smooth. A chance of showers and thunderstorms.
.MONDAY...South winds near 5 knots, becoming variable. Bay waters
smooth. A chance of showers and thunderstorms.
.MONDAY NIGHT...Variable winds near 5 knots, becoming east to
southeast. Bay waters smooth. A chance of showers and
thunderstorms.
.TUESDAY...Southeast winds near 5 knots. Bay waters smooth. A
chance of showers and thunderstorms.
.TUESDAY NIGHT...East winds 5 to 10 knots. Bay waters smooth to a
light chop. A chance of showers and thunderstorms.
.WEDNESDAY...East winds near 10 knots. Bay waters a light chop. A
chance of showers and thunderstorms.
.WEDNESDAY NIGHT THROUGH THURSDAY NIGHT...East to southeast winds
near 10 knots. Bay waters 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...East to southeast winds near 10 knots. Bay waters
a light chop. A chance of showers and thunderstorms.

$$

GMZ032-035-070830-
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-
421 PM EDT Sun Sep 6 2026

.TONIGHT...Variable winds near 5 knots, becoming southeast to
south. Seas 1 foot or less. Nearshore waters smooth. A chance of
showers and thunderstorms.
.MONDAY...Southeast to south winds near 5 knots. Seas 1 foot or
less. Nearshore waters smooth. A chance of showers and
thunderstorms.
.MONDAY NIGHT...Southeast winds near 5 knots. Seas 1 foot or
less. Nearshore waters smooth. A chance of showers and
thunderstorms.
.TUESDAY...East to southeast winds near 5 knots. Seas 1 foot or
less. Nearshore waters smooth. A chance of showers and
thunderstorms.
.TUESDAY NIGHT AND WEDNESDAY...East winds 5 to 10 knots. Seas 1
foot or less. Nearshore waters smooth to a light chop. A chance of
showers and thunderstorms.
.WEDNESDAY NIGHT THROUGH THURSDAY NIGHT...East to southeast winds
near 10 knots. Seas around 1 foot. Nearshore waters a light chop.
A chance of showers and 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 and 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.

$$

GMZ042>044-070830-
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-
421 PM EDT Sun Sep 6 2026

.TONIGHT...Variable winds near 5 knots, becoming southeast to
south. Seas 1 foot or less. Nearshore waters smooth. A chance of
showers and thunderstorms.
.MONDAY...Southeast to south winds near 5 knots. Seas 1 foot or
less. Nearshore waters smooth. A chance of showers and
thunderstorms.
.MONDAY NIGHT...East to southeast winds near 5 knots. Seas 1 foot
or less. Nearshore waters smooth. A chance of showers and
thunderstorms.
.TUESDAY...East to southeast winds near 5 knots. Seas 1 foot or
less. Nearshore waters smooth. A chance of showers and
thunderstorms.
.TUESDAY NIGHT...East winds 5 to 10 knots. Seas around 1 foot.
Nearshore waters smooth to a light chop. A chance of showers and
thunderstorms.
.WEDNESDAY...East winds near 10 knots. Seas around 1 foot.
Nearshore waters a light chop. A chance of showers and
thunderstorms.
.WEDNESDAY NIGHT THROUGH THURSDAY NIGHT...East winds near 10
knots. Seas 1 to 2 feet. Nearshore waters a light chop. A chance
of showers and thunderstorms.
showers and thunderstorms.
.FRIDAY...East to southeast winds 5 to 10 knots. Seas around
1 foot. Nearshore waters smooth to a light chop. A chance of
showers and 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.

$$

GMZ052>055-072>075-070830-
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-
421 PM EDT Sun Sep 6 2026

.TONIGHT...Southeast to south winds near 5 knots. Seas around
1 foot. Wave Detail: East to southeast 1 foot at 3 seconds. A
chance of showers and thunderstorms.
.MONDAY...Southeast to south winds near 5 knots. Seas around 1
foot. Wave Detail: East to southeast 1 foot at 3 seconds. A
chance of showers and thunderstorms.
.MONDAY NIGHT...East winds near 5 knots. Seas around 1 foot. A
chance of showers and thunderstorms. Wave Detail: East to
southeast 1 foot at 3 seconds.
.TUESDAY...East winds near 5 knots. Seas around 1 foot. A chance
of showers and thunderstorms.
.TUESDAY NIGHT...East winds 5 to 10 knots. Seas 1 to 2 feet. A
chance of showers and thunderstorms.
.WEDNESDAY...East winds near 10 knots. Seas around 2 feet. A
slight chance of showers and thunderstorms.
.WEDNESDAY NIGHT...East winds 10 to 15 knots. Seas 2 to 3 feet. A
chance of showers and thunderstorms.
.THURSDAY...East to southeast winds 10 to 15 knots, becoming east
and decreasing to near 10 knots. Seas 2 to 3 feet, subsiding to
around 2 feet. A slight chance of showers and thunderstorms.
.THURSDAY NIGHT THROUGH FRIDAY NIGHT...East to southeast winds
near 10 knots. Seas around 2 feet. A chance of showers and
thunderstorms.

$$

GMZ033-034-070830-
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-
421 PM EDT Sun Sep 6 2026

.TONIGHT...Variable winds near 5 knots, becoming southeast to
south. Seas 1 foot or less. A chance of showers and
thunderstorms.
.MONDAY...Southeast to south winds near 5 knots. Seas 1 foot or
less. A chance of showers and thunderstorms.
.MONDAY NIGHT...Southeast to south winds near 5 knots. Seas 1
foot or less. A chance of showers and thunderstorms.
.TUESDAY...East winds near 5 knots. Seas 1 foot or less. A chance
of showers and thunderstorms.
.TUESDAY NIGHT...Northeast to east winds 5 to 10 knots. Seas
around 1 foot. A chance of showers and thunderstorms.
.WEDNESDAY...East winds near 10 knots. Seas 1 to 2 feet. A chance
of showers and thunderstorms.
.WEDNESDAY NIGHT THROUGH FRIDAY NIGHT...East to southeast winds
near 10 knots. Seas 1 to 2 feet. A chance of showers and
thunderstorms.

$$

BT/AP