911
FZUS52 KKEY 150822
CWFKEY

Coastal Waters Forecast for the Florida Keys
National Weather Service Key West FL
422 AM EDT Tue Sep 15 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.

GMZ005-152030-
Synopsis for Keys coastal waters from Ocean Reef to Dry Tortugas
422 AM EDT Tue Sep 15 2026

.SYNOPSIS...
Light east to southeasterly breezes this morning will gradually
freshen this afternoon and evening as a continental high builds
southward towards our area. Expect breezes to peak in the moderate
range this evening and late Wednesday. Near normal rain chances
will trend considerably upwards through mid week as broad
troughing and increasing moisture moves in from the east.

The Approximate Shoreward Edge of the Gulf Stream as of September
11, 2026...

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

Gulf Stream Information Courtesy of the National Weather Service in
Key West, using data from RTOFS and NASA SPoRT SST.

$$

GMZ031-152030-
Florida Bay including Barnes Sound, Blackwater Sound, and
Buttonwood Sound-
422 AM EDT Tue Sep 15 2026

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

$$

GMZ032-035-152030-
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-
422 AM EDT Tue Sep 15 2026

.TODAY...East to southeast winds 5 to 10 knots, becoming northeast
to east 10 to 15 knots late. Seas 1 foot or less. Nearshore
waters smooth to a light chop, becoming a light to moderate chop
late. A chance of showers and thunderstorms.
.TONIGHT...Northeast to east winds near 15 knots. Seas 1 to 2
feet, except 2 to 3 feet west of the Marquesas Keys. Nearshore
waters a moderate chop. Showers likely with a chance of
thunderstorms.
.WEDNESDAY...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.
.WEDNESDAY NIGHT...East winds near 15 knots. Seas 1 to 2 feet,
except 2 to 3 feet west of the Marquesas Keys. Nearshore waters a
moderate chop. Showers likely with a chance of thunderstorms.
.THURSDAY...East winds 10 to 15 knots, decreasing to near 10 knots.
Seas 1 to 2 feet. Nearshore waters a light to moderate chop,
becoming a light chop. Showers with a chance of thunderstorms.
.THURSDAY NIGHT...East winds 10 to 15 knots. Seas 1 to 2 feet.
Nearshore waters a light to moderate chop. Showers with a chance
of thunderstorms.
.FRIDAY...East to southeast winds near 10 knots, decreasing to 5
to 10 knots. Seas 1 foot or less. Nearshore waters a light chop,
becoming smooth to a light chop. A chance of showers and
thunderstorms.
.FRIDAY NIGHT...East to southeast winds 5 to 10 knots. Seas
1 foot or less. Nearshore waters smooth to a light chop. Showers
likely with a chance of thunderstorms.
.SATURDAY...Southeast winds 5 to 10 knots. Seas 1 foot or less.
Nearshore waters smooth. Showers likely with a chance of
thunderstorms.
.SATURDAY NIGHT...Southeast winds 5 to 10 knots. Seas 1 foot or
less. Nearshore waters smooth to a light chop. A chance of
showers and thunderstorms.

$$

GMZ042>044-152030-
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-
422 AM EDT Tue Sep 15 2026

.TODAY...East to southeast winds 5 to 10 knots, becoming northeast
to east 10 to 15 knots. Seas 1 to 2 feet. Nearshore waters smooth
to a light chop, becoming a light to moderate chop. A chance of
showers and thunderstorms.
.TONIGHT...Northeast to east winds near 15 knots. Seas 2 to 3
feet. Nearshore waters a moderate chop. Showers likely with a
chance of thunderstorms.
.WEDNESDAY...East winds 10 to 15 knots. Seas 2 to 3 feet.
Nearshore waters a light to moderate chop. A chance of showers
and thunderstorms.
.WEDNESDAY NIGHT...East winds near 15 knots. Seas 2 to 3 feet.
Nearshore waters a moderate chop. Showers likely with a chance of
thunderstorms.
.THURSDAY...East winds 10 to 15 knots, decreasing to near 10
knots. Seas 1 to 2 feet. Nearshore waters a light to moderate
chop, becoming a light chop. Showers likely with a chance of
thunderstorms.
.THURSDAY 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.
.FRIDAY...East to southeast winds near 10 knots, decreasing to 5
to 10 knots. Seas 1 to 2 feet. Nearshore waters a light chop,
becoming smooth to a light chop. A chance of showers and
thunderstorms.
.FRIDAY NIGHT...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.
.SATURDAY...Southeast winds 5 to 10 knots. Seas around 1 foot.
Nearshore waters smooth. A chance of showers and thunderstorms.
.SATURDAY NIGHT...Southeast winds 5 to 10 knots. Seas around 1
foot. Nearshore waters smooth to a light chop. A chance of showers
and thunderstorms.

$$

GMZ052>055-072>075-152030-
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-
422 AM EDT Tue Sep 15 2026

.TODAY...East to southeast winds near 10 knots, becoming northeast
to east 10 to 15 knots. Seas 1 to 2 feet. Wave Detail: East to
southeast 2 feet at 4 seconds. A chance of showers and
thunderstorms.
.TONIGHT...East winds near 15 knots. Seas 3 to 4 feet,
occasionally to 5 feet. Wave Detail: East 4 feet at 5 seconds.
Showers likely with a chance of thunderstorms.
.WEDNESDAY...East winds 10 to 15 knots. Seas 2 to 3 feet. Wave
Detail: East 3 feet at 5 seconds. A chance of showers and
thunderstorms.
.WEDNESDAY NIGHT...East winds near 15 knots. Seas 3 to 4 feet.
Showers likely with a chance of thunderstorms.
.THURSDAY...East winds near 10 knots. Seas 2 to 3 feet. Showers
likely with a chance of thunderstorms.
.THURSDAY NIGHT...East winds 10 to 15 knots. Seas 2 to 3 feet.
Showers likely with a chance of thunderstorms.
.FRIDAY...East to southeast winds near 10 knots, decreasing to 5
to 10 knots. Seas around 2 feet. A chance of showers and
thunderstorms.
.FRIDAY NIGHT...East to southeast winds 5 to 10 knots. Seas 1 to
2 feet. A chance of showers and thunderstorms.
.SATURDAY...Southeast winds 5 to 10 knots. Seas around 1 foot. A
chance of showers and thunderstorms.
.SATURDAY NIGHT...Southeast winds 5 to 10 knots. Seas around 1
foot. A chance of showers and thunderstorms.

$$

GMZ033-034-152030-
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-
422 AM EDT Tue Sep 15 2026

.TODAY...East to southeast winds 5 to 10 knots, becoming northeast
to east near 10 knots late. Seas around 1 foot. Wave Detail:
East to southeast 1 foot at 2 seconds. A chance of showers and
thunderstorms.
.TONIGHT...East winds increasing to near 15 knots. Seas building
to 2 to 3 feet. Wave Detail: East 2 feet at 3 seconds. Showers
likely with a chance of thunderstorms.
.WEDNESDAY...Northeast to east winds 10 to 15 knots. Seas 2 to
3 feet. Wave Detail: Northeast to east 2 feet at 4 seconds.
Showers likely with a chance of thunderstorms.
.WEDNESDAY NIGHT...East winds 15 to 20 knots. Seas 2 to 4 feet.
Showers likely with a chance of thunderstorms.
.THURSDAY...East winds 10 to 15 knots, decreasing to near 10 knots.
Seas 2 to 3 feet. Showers with a chance of thunderstorms.
.THURSDAY NIGHT...East winds 10 to 15 knots. Seas 1 to 2 feet.
Showers with a chance of thunderstorms.
.FRIDAY...East to southeast winds 5 to 10 knots. Seas 1 to
2 feet. Showers likely with a chance of thunderstorms.
.FRIDAY NIGHT...East to southeast winds 5 to 10 knots. Seas
around 1 foot. Showers likely with a chance of thunderstorms.
.SATURDAY...Southeast to south winds near 5 knots. Seas 1 foot or
less. Showers likely with a chance of thunderstorms.
.SATURDAY NIGHT...Southeast to south winds near 5 knots. Seas
1 foot or less. A chance of showers and thunderstorms.

$$