566
FZUS52 KKEY 280825
CWFKEY

Coastal Waters Forecast for the Florida Keys
National Weather Service Key West FL
425 AM EDT Fri Aug 28 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.

GMZ005-282030-
Synopsis for Keys coastal waters from Ocean Reef to Dry Tortugas
425 AM EDT Fri Aug 28 2026

.SYNOPSIS...The western periphery of an Atlantic high is expected
to maintain control of the Keys for the next several days. This
will continue to promote peaking and lulling east to southeast
breezes. Breezes will peak in the evening through early morning
hours and lull in the afternoons. In addition, the southeasterly
flow will also 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.

$$

GMZ031-282030-
Florida Bay including Barnes Sound, Blackwater Sound, and
Buttonwood Sound-
425 AM EDT Fri Aug 28 2026

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

$$

GMZ032-035-282030-
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 Fri Aug 28 2026

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

$$

GMZ042>044-282030-
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 Fri Aug 28 2026

.TODAY...East to southeast winds 5 to 10 knots. Seas around
1 foot. Nearshore waters smooth to a light chop. A chance of
thunderstorms with a slight chance of showers.
.TONIGHT...Northeast to east winds 5 to 10 knots, becoming east
and increasing to 10 to 15 knots after midnight. Seas around 1
foot, building to around 2 feet. Nearshore waters smooth to a
light chop, becoming a light to moderate chop. A slight chance of
showers and thunderstorms.
.SATURDAY...East winds near 10 knots. Seas 1 to 2 feet. Nearshore
waters a light chop. A chance of showers and thunderstorms.
.SATURDAY NIGHT...East winds 10 to 15 knots, becoming east to
southeast. Seas around 2 feet. Nearshore waters a light to
moderate chop. A chance of showers and thunderstorms.
.SUNDAY...East to southeast 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. A chance of showers and
thunderstorms.
.SUNDAY NIGHT...East winds 10 to 15 knots. Seas around 2 feet.
Nearshore waters a light to moderate chop. A chance of showers
and thunderstorms.
.MONDAY...East 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...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 5 to 10 knots. Seas 1 to 2 feet. Nearshore
waters smooth to a light chop. A chance of showers and
thunderstorms.
.TUESDAY 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.

$$

GMZ052>055-072>075-282030-
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 Fri Aug 28 2026

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

$$

GMZ033-034-282030-
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 Fri Aug 28 2026

.TODAY...East to southeast winds 5 to 10 knots, decreasing to near
5 knots. Seas 1 foot or less. Wave Detail: East to southeast 1
foot at 3 seconds. A chance of showers and thunderstorms.
.TONIGHT...East winds 5 to 10 knots, increasing to near 10 knots.
Seas around 1 foot. Wave Detail: East 1 foot at 3 seconds. A
slight chance of showers and thunderstorms.
.SATURDAY...East winds near 10 knots, decreasing to 5 to 10
knots. Seas around 1 foot. Wave Detail: East 1 foot at 3 seconds.
A chance of showers and thunderstorms.
.SATURDAY NIGHT...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.
.SUNDAY...East to southeast winds near 10 knots. Seas 1 to
2 feet. Showers likely with a chance of thunderstorms.
.SUNDAY NIGHT...East winds 10 to 15 knots. Seas around 2 feet. 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 1 to 2
feet. Showers likely with a chance of thunderstorms.
.MONDAY NIGHT...East winds near 10 knots. Seas around 1 foot. A
chance of showers and thunderstorms.
.TUESDAY...East winds 5 to 10 knots. Seas around 1 foot. A chance
of showers and thunderstorms.
.TUESDAY NIGHT...East winds near 10 knots. Seas around 1 foot.
Showers likely with a chance of thunderstorms.

$$

MJV