538
FZUS52 KKEY 102024
CWFKEY

Coastal Waters Forecast for the Florida Keys
National Weather Service Key West FL
424 PM EDT Thu Sep 10 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.

GMZ005-110830-
Synopsis for Keys coastal waters from Ocean Reef to Dry Tortugas
424 PM EDT Thu Sep 10 2026

.SYNOPSIS...
Ridging across the southeastern United States and Florida will
maintain gentle to moderate east to southeasterly breezes. Expect
breezes to peak in the evening and overnight while lulling during
the day during the day. A series of lower level moisture swathes
will support periods of elevated rain and thunder chances through
the remainder of the 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.

$$

GMZ031-110830-
Florida Bay including Barnes Sound, Blackwater Sound, and
Buttonwood Sound-
424 PM EDT Thu Sep 10 2026

.TONIGHT...East winds near 10 knots. Bay waters a light chop. A
chance of showers and thunderstorms.
.FRIDAY...East to southeast winds near 10 knots. Bay waters a
light chop. A chance of showers and thunderstorms.
.FRIDAY NIGHT...East to southeast winds increasing to 10 to 15
knots. Bay waters becoming a light to moderate chop. A chance of
showers and thunderstorms.
.SATURDAY...East to southeast winds near 10 knots. Bay waters a
light chop. Showers likely with a chance of thunderstorms.
.SATURDAY NIGHT...East to southeast winds near 10 knots. Bay
waters a light chop. Showers likely with a chance of
thunderstorms.
.SUNDAY...East to southeast winds 5 to 10 knots. Bay waters
smooth to a light chop. A chance of showers and thunderstorms.
.SUNDAY NIGHT...East winds near 10 knots. Bay waters a light
chop. A slight chance of showers and thunderstorms.
.MONDAY...East winds near 10 knots. Bay waters a light chop. A
chance of showers and thunderstorms.
.MONDAY NIGHT...Northeast to east winds 10 to 15 knots. Bay
waters a light to moderate chop. A chance of showers and
thunderstorms.
.TUESDAY...East winds 10 to 15 knots. Bay waters a light to
moderate chop. A chance of showers and thunderstorms.
.TUESDAY NIGHT...Northeast to east winds 10 to 15 knots. Bay
waters light to moderate chop. A chance of showers and
thunderstorms.

$$

GMZ032-035-110830-
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-
424 PM EDT Thu Sep 10 2026

.TONIGHT...East to southeast winds near 10 knots, increasing to
10 to 15 knots. Seas around 1 foot, except building to 1 to 2
feet west of the Marquesas Keys. Nearshore waters a light chop,
becoming a light to moderate chop. A chance of showers and
thunderstorms.
.FRIDAY...East to southeast winds near 10 knots. Seas around
1 foot. Nearshore waters a light chop. A chance of showers and
thunderstorms.
.FRIDAY NIGHT...East to southeast winds increasing to 10 to 15
knots. Seas around 1 foot, except building to 1 to 2 feet west of
the Marquesas Keys. Nearshore waters becoming a light to moderate
chop. A chance of showers and thunderstorms.
.SATURDAY...East to southeast winds near 10 knots. Seas around
1 foot. Nearshore waters a light chop. A chance of showers and
thunderstorms.
.SATURDAY NIGHT...East to southeast winds 10 to 15 knots. Seas
around 1 foot, except building to 1 to 2 feet west of the
Marquesas Keys. Nearshore waters a light to moderate chop.
Showers likely with a chance of thunderstorms.
.SUNDAY...East to southeast winds 5 to 10 knots. Seas subsiding
to 1 foot or less. Nearshore waters smooth to a light chop. A
chance of showers and thunderstorms.
.SUNDAY NIGHT...East winds near 10 knots. Seas around 1 foot.
Nearshore waters a light chop. A chance of showers and
thunderstorms.
.MONDAY...East winds near 10 knots. Seas around 1 foot. Nearshore
waters a light chop. A chance of showers and thunderstorms.
.MONDAY NIGHT...Northeast to east winds 10 to 15 knots. Seas
1 foot or less. Nearshore waters a light to moderate chop. A
chance of showers and thunderstorms.
.TUESDAY...East winds 10 to 15 knots. Seas 1 to 2 feet. Nearshore
waters a light to moderate chop. Showers likely with a chance of
thunderstorms.
.TUESDAY NIGHT...East winds 10 to 15 knots. Seas 1 to 2 feet.
Nearshore waters a light to moderate chop. Showers likely with a
chance of thunderstorms.

$$

GMZ042>044-110830-
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-
424 PM EDT Thu Sep 10 2026

.TONIGHT...East to southeast winds near 10 knots, increasing to
10 to 15 knots. Seas 1 to 2 feet. Nearshore waters a light chop,
becoming a light to moderate chop. A chance of showers and
thunderstorms.
.FRIDAY...East to southeast winds near 10 knots. Seas 1 to
2 feet. Nearshore waters a light chop. A chance of showers and
thunderstorms.
.FRIDAY NIGHT...East to southeast winds increasing to 10 to 15
knots. Seas 1 to 2 feet. Nearshore waters becoming a light to
moderate chop. A chance of showers and thunderstorms.
.SATURDAY...East to southeast winds decreasing to near 10 knots.
Seas 1 to 2 feet. Nearshore waters becoming 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
showers and thunderstorms.
.SUNDAY NIGHT...East winds near 10 knots. Seas around 1 foot.
Nearshore waters a light chop. A chance of showers and
thunderstorms.
.MONDAY...East winds near 10 knots. Seas around 1 foot. Nearshore
waters a light chop. A chance of showers and thunderstorms.
.MONDAY NIGHT...East winds 10 to 15 knots. Seas 1 to 2 feet.
Nearshore waters a light to moderate chop. A chance of showers
and thunderstorms.
.TUESDAY...East winds 10 to 15 knots. Seas 2 to 3 feet. Nearshore
waters a light to moderate chop. Showers likely with a chance of
thunderstorms.
.TUESDAY NIGHT...East winds near 15 knots. Seas 2 to 4 feet,
occasionally to 5 feet. Nearshore waters a moderate chop. Showers
likely with a chance of thunderstorms.

$$

GMZ052>055-072>075-110830-
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-
424 PM EDT Thu Sep 10 2026

.TONIGHT...East to southeast winds 10 to 15 knots. Seas 2 to
3 feet. Wave Detail: East 3 feet at 5 seconds. A chance of
showers and thunderstorms.
.FRIDAY...East to southeast winds 10 to 15 knots, becoming east
near 10 knots. Seas 2 to 3 feet. Wave Detail: East to southeast 2
feet at 5 seconds. A chance of showers and thunderstorms.
.FRIDAY NIGHT...East to southeast winds 10 to 15 knots. Seas 2 to
3 feet. Wave Detail: East to southeast 3 feet at 4 seconds. A
chance of showers and thunderstorms.
.SATURDAY...East to southeast winds 10 to 15 knots. Seas 2 to
3 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 near 10 knots. Seas around
2 feet. A chance of showers and thunderstorms.
.SUNDAY NIGHT...East winds near 10 knots. Seas 1 to 2 feet. A
chance of showers and thunderstorms.
.MONDAY...East winds near 10 knots. Seas around 2 feet. A chance
of showers and thunderstorms.
.MONDAY NIGHT...Northeast to east winds 10 to 15 knots. Seas 2 to
3 feet. A chance of showers and thunderstorms.
.TUESDAY...East winds 10 to 15 knots. Seas 2 to 4 feet,
occasionally to 5 feet. A chance of showers and thunderstorms.
.TUESDAY NIGHT...East winds near 15 knots. Seas 3 to 5 feet,
occasionally to 6 feet. Showers likely with a chance of
thunderstorms.

$$

GMZ033-034-110830-
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-
424 PM EDT Thu Sep 10 2026

.TONIGHT...East to southeast winds near 10 knots. Seas 1 to
2 feet. Wave Detail: East 1 foot at 3 seconds. A chance of
showers and thunderstorms.
.FRIDAY...East to southeast winds 5 to 10 knots. Seas 1 to
2 feet. Wave Detail: Southeast 1 foot at 3 seconds. A chance of
showers and thunderstorms.
.FRIDAY NIGHT...East to southeast winds near 10 knots, increasing
to 10 to 15 knots. Seas 1 to 2 feet. Wave Detail: East 1 foot at
3 seconds. A chance of showers and thunderstorms.
.SATURDAY...East to southeast winds near 10 knots. Seas 1 to
2 feet. Showers likely with a chance of thunderstorms.
.SATURDAY NIGHT...East to southeast winds 10 to 15 knots. Seas
1 to 2 feet. A chance of showers and thunderstorms.
.SUNDAY...East to southeast winds 5 to 10 knots. Seas around
1 foot. Showers likely with a chance of thunderstorms.
.SUNDAY NIGHT...East winds 5 to 10 knots. Seas around 1 foot. A
chance of showers and thunderstorms.
.MONDAY...East winds 5 to 10 knots. Seas around 1 foot. A chance
of showers and thunderstorms.
.MONDAY NIGHT...Northeast to east winds 5 to 10 knots, becoming
east 10 to 15 knots. Seas building to 1 to 2 feet. A chance of
showers and thunderstorms.
.TUESDAY...East winds near 10 knots. Seas 1 to 2 feet. Showers
likely with a chance of thunderstorms.
.TUESDAY NIGHT...East winds 10 to 15 knots. Seas around 2 feet.
Showers likely with a chance of thunderstorms.

$$