952
FZUS52 KKEY 311429
CWFKEY

Coastal Waters Forecast for the Florida Keys
National Weather Service Key West FL
1029 AM EDT Mon Aug 31 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.

GMZ005-010230-
Synopsis for Keys coastal waters from Ocean Reef to Dry Tortugas
1029 AM EDT Mon Aug 31 2026

.SYNOPSIS...
The western periphery of an Atlantic high remains in control of
the Keys for the next several days. Therefore, expect continued
peaking and lulling breezes. The direction will also shift over
the next few days with east to southeasterly breezes overnight
and in the morning with northeast to east breezes late afternoon
and evening. In addition, the overall flow will keep deep moisture
in place across the region with daily chances of showers and
thunderstorms. Locally hazardous winds and seas are expected in
the vicinity of thunderstorm activity.

The Approximate Shoreward Edge of the Gulf Stream as of August 26,
2026...

32 NM south of Dry Tortugas Light, on Loggerhead Key
 9 NM south-southeast of Cosgrove Shoal Light, off the Marquesas Keys
 7 NM south-southeast of Sand Key Light, off Key West
 6 NM south-southeast of Looe Key, off Big Pine Key
 7 NM south-southeast of Sombrero Key Light, off Marathon
 4 NM southeast of Alligator Reef Light, off Islamorada
 1 NM west-northwest of Molasses Reef Light, off Key Largo
 1 NM east-southeast of Carysfort Reef Light, off Ocean Reef

Gulf Stream Information Courtesy of the Naval Oceanographic
Office.

$$

GMZ031-010230-
Florida Bay including Barnes Sound, Blackwater Sound, and
Buttonwood Sound-
1029 AM EDT Mon Aug 31 2026

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

$$

GMZ032-035-010230-
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-
1029 AM EDT Mon Aug 31 2026

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

$$

GMZ042>044-010230-
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-
1029 AM EDT Mon Aug 31 2026

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

$$

GMZ052>055-072>075-010230-
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-
1029 AM EDT Mon Aug 31 2026

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

$$

GMZ033-034-010230-
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-
1029 AM EDT Mon Aug 31 2026

.TODAY...East winds 5 to 10 knots, becoming northeast to east and
decreasing to near 5 knots. Seas around 1 foot, subsiding to 1
foot or less. Wave Detail: East 1 foot at 3 seconds. A chance of
showers and thunderstorms.
.TONIGHT...Northeast to east winds 5 to 10 knots, becoming east.
Seas around 1 foot. Wave Detail: Northeast to east 1 foot at 3
seconds. A chance of showers and thunderstorms.
.TUESDAY...East to southeast winds 5 to 10 knots, becoming
northeast to east and decreasing to near 5 knots in the
afternoon. Seas around 1 foot, subsiding to 1 foot or less. Wave
Detail: East to southeast 1 foot at 3 seconds. A chance of showers
and thunderstorms.
.TUESDAY NIGHT...Northeast to east winds near 5 knots, becoming
east and increasing to 5 to 10 knots after midnight. Seas 1 foot
or less, building to around 1 foot. A chance of showers and
thunderstorms.
.WEDNESDAY...East to southeast winds near 5 knots, becoming
northeast to east. Seas 1 foot or less. A chance of showers and
thunderstorms.
.WEDNESDAY NIGHT...East winds near 5 knots, increasing to 5 to 10
knots. Seas 1 foot or less, building to around 1 foot. A chance
of showers and thunderstorms.
.THURSDAY...East to southeast winds 5 to 10 knots, increasing to
near 10 knots. Seas around 1 foot. Showers likely with a chance
of thunderstorms.
.THURSDAY NIGHT...East to southeast winds near 10 knots. Seas
1 to 2 feet. Showers and thunderstorms likely.
.FRIDAY...Southeast winds 5 to 10 knots. Seas around 1 foot.
Showers and thunderstorms likely.
.FRIDAY NIGHT...Southeast winds 5 to 10 knots. Seas around
1 foot. Showers and thunderstorms likely.

$$