646
FZUS52 KKEY 300825
CWFKEY

Coastal Waters Forecast for the Florida Keys
National Weather Service Key West FL
425 AM EDT Sun Aug 30 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.

GMZ005-302030-
Synopsis for Keys coastal waters from Ocean Reef to Dry Tortugas
425 AM EDT Sun Aug 30 2026

.SYNOPSIS...
The western periphery of an Atlantic high remains in control of
the Keys for the next several days. Therefor, expect continued
peaking and lulling breezes. The direction will also shift over
the coming 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.

$$

GMZ031-302030-
Florida Bay including Barnes Sound, Blackwater Sound, and
Buttonwood Sound-
425 AM EDT Sun Aug 30 2026

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

$$

GMZ032-035-302030-
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-
425 AM EDT Sun Aug 30 2026

.TODAY...East to southeast winds 10 to 15 knots, decreasing to 5
to 10 knots. Seas 1 to 2 feet, subsiding to around 1 foot.
Nearshore waters a light to moderate chop, becoming smooth to a
light chop. A chance of showers and thunderstorms.
.TONIGHT...East winds near 10 knots, increasing briefly 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.
.MONDAY...East to southeast winds near 10 knots, becoming east and
decreasing to 5 to 10 knots. Seas around 1 foot. Nearshore waters
a light chop, becoming smooth to a light chop. A chance of
showers and thunderstorms.
.MONDAY NIGHT...Northeast to east winds near 10 knots, becoming
east. Seas around 1 foot. Nearshore waters a light chop. A chance
of showers and thunderstorms.
.TUESDAY...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.
.TUESDAY NIGHT...Northeast to east winds near 10 knots, becoming
east and increasing to 10 to 15 knots. Seas 1 foot or less,
building to 1 to 2 feet. Nearshore waters a light chop, becoming a
light to moderate chop. A chance of showers and thunderstorms.
.WEDNESDAY...East to southeast winds near 10 knots. Seas around 1
foot. Nearshore waters a light chop. Showers with a chance of
thunderstorms.
.WEDNESDAY NIGHT...East winds 10 to 15 knots. Seas around 1 foot.
Nearshore waters a light to moderate chop. Showers and
thunderstorms likely.
.THURSDAY...East winds near 10 knots. Seas around 1 foot.
Nearshore waters a light chop. Showers and thunderstorms likely.
.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.

$$

GMZ042>044-302030-
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-
425 AM EDT Sun Aug 30 2026

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

$$

GMZ052>055-072>075-302030-
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-
425 AM EDT Sun Aug 30 2026

.TODAY...East to southeast winds 10 to 15 knots, becoming east and
decreasing to near 10 knots. Seas around 3 feet, subsiding to 2
to 3 feet. Wave Detail: East 3 feet at 5 seconds. A chance of
showers and thunderstorms.
.TONIGHT...Northeast to east winds 10 to 15 knots, becoming east.
Seas 2 to 4 feet, occasionally to 5 feet. Wave Detail: East 3
feet at 4 seconds. A chance of showers and thunderstorms.
.MONDAY...East to southeast winds near 10 knots, becoming
northeast to east and decreasing to 5 to 10 knots. Seas 2 to 3
feet, subsiding to around 2 feet. Wave Detail: East 2 feet at 4
seconds. A chance of showers and thunderstorms.
.MONDAY NIGHT...Northeast to east winds near 10 knots, becoming
east to southeast and increasing to 10 to 15 knots. Seas 2 to 3
feet. A chance of showers and thunderstorms.
.TUESDAY...East to southeast winds near 10 knots, becoming
northeast to east and decreasing to 5 to 10 knots. Seas around 2
feet, subsiding to 1 to 2 feet. A chance of showers and
thunderstorms.
.TUESDAY NIGHT...Northeast to east winds near 10 knots, becoming
east and increasing to 10 to 15 knots. Seas around 2 feet,
building to 2 to 3 feet. A chance of showers and thunderstorms.
.WEDNESDAY...East to southeast winds near 10 knots, becoming
northeast to east. Seas around 2 feet. Showers likely with a
chance of 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
5 to 10 knots in the afternoon. Seas 2 to 3 feet. Showers and
thunderstorms likely.
.THURSDAY NIGHT...East to southeast winds 10 to 15 knots. Seas
around 2 feet. Showers likely with a chance of thunderstorms.

$$

GMZ033-034-302030-
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-
425 AM EDT Sun Aug 30 2026

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

$$

MJV