196
FZUS52 KKEY 052017
CWFKEY

Coastal Waters Forecast for the Florida Keys
National Weather Service Key West FL
417 PM EDT Sat Sep 5 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.

GMZ005-060830-
Synopsis for Keys coastal waters from Ocean Reef to Dry Tortugas
417 PM EDT Sat Sep 5 2026

.SYNOPSIS...
Light to gentle southeast breezes will prevail through mid week,
as weak steering flow persists across the region. Thereafter,
breezes will freshen to gentle to moderate, as high pressure
builds in. Waves of low-level moisture pushing across the Keys
will support elevated rain and thunder chances through Sunday,
possibly returning to near normal by mid 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.

$$

GMZ031-060830-
Florida Bay including Barnes Sound, Blackwater Sound, and
Buttonwood Sound-
417 PM EDT Sat Sep 5 2026

.TONIGHT...Southeast to south winds near 5 knots. Bay waters
smooth. A chance of showers and thunderstorms.
.SUNDAY...South winds near 5 knots. Bay waters smooth. A chance
of showers and thunderstorms.
.SUNDAY NIGHT...South winds near 5 knots. Bay waters smooth. A
chance of showers and thunderstorms.
.MONDAY...South winds near 5 knots. Bay waters smooth. A chance
of showers and thunderstorms.
.MONDAY NIGHT...Southeast to south winds near 5 knots. Bay waters
smooth. A chance of showers and thunderstorms.
.TUESDAY...Southeast winds near 5 knots. Bay waters smooth. A
chance of showers and thunderstorms.
.TUESDAY NIGHT...East winds 5 to 10 knots, increasing to near 10
knots. Bay waters smooth to a light chop, becoming a light chop.
A chance of showers and thunderstorms.
.WEDNESDAY THROUGH THURSDAY NIGHT...East winds near 10 knots. Bay
waters a light chop. A chance of showers and thunderstorms.

$$

GMZ032-035-060830-
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-
417 PM EDT Sat Sep 5 2026

.TONIGHT...Southeast to south winds near 5 knots. Seas 1 foot or
less. Nearshore waters smooth. A chance of showers and
thunderstorms.
.SUNDAY...Southeast to south winds near 5 knots. Seas 1 foot or
less. Nearshore waters smooth. A chance of showers and
thunderstorms.
.SUNDAY NIGHT...South winds near 5 knots. Seas 1 foot or less.
Nearshore waters smooth. A chance of showers and thunderstorms.
.MONDAY...South winds near 5 knots. Seas 1 foot or less.
Nearshore waters smooth. A chance of showers and thunderstorms.
.MONDAY NIGHT...Southeast to south winds near 5 knots. Seas
1 foot or less. Nearshore waters smooth. A chance of showers and
thunderstorms.
.TUESDAY...Southeast winds near 5 knots. Seas 1 foot or less.
Nearshore waters smooth. A chance of showers and thunderstorms.
.TUESDAY NIGHT...East winds 5 to 10 knots, increasing to near 10
knots. Seas 1 foot or less, building to around 1 foot. Nearshore
waters smooth to a light chop, becoming a light chop. A chance of
showers and thunderstorms.
.WEDNESDAY THROUGH THURSDAY NIGHT...East winds near 10 knots.
Seas around 1 foot. Nearshore waters a light chop. A chance of
showers and thunderstorms.

$$

GMZ042>044-060830-
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-
417 PM EDT Sat Sep 5 2026

.TONIGHT...Southeast to south winds 5 to 10 knots. Seas around 1
foot. Nearshore waters smooth to a light chop. A chance of showers
and thunderstorms.
.SUNDAY...South winds near 5 knots. Seas 1 foot or less.
Nearshore waters smooth. A chance of showers and thunderstorms.
.SUNDAY NIGHT...Southeast to south winds near 5 knots. Seas
1 foot or less. Nearshore waters smooth. A chance of showers and
thunderstorms.
.MONDAY...South winds near 5 knots. Seas 1 foot or less.
Nearshore waters smooth. A chance of showers and thunderstorms.
.MONDAY NIGHT...Southeast winds near 5 knots. Seas 1 foot or
less. Nearshore waters smooth. A chance of showers and
thunderstorms.
.TUESDAY...Southeast winds near 5 knots. Seas 1 foot or less.
Nearshore waters smooth. A chance of showers and thunderstorms.
.TUESDAY NIGHT...East winds 5 to 10 knots, increasing to near 10
knots. Seas 1 foot or less, building to around 1 foot. Nearshore
waters smooth to a light chop. A chance of showers and
thunderstorms.
.WEDNESDAY THROUGH THURSDAY NIGHT...East winds near 10 knots.
Seas 1 to 2 feet. Nearshore waters a light chop. A chance of
showers and thunderstorms.

$$

GMZ052>055-072>075-060830-
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-
417 PM EDT Sat Sep 5 2026

.TONIGHT...Southeast to south winds 5 to 10 knots. Seas 1 to 2
feet. Wave Detail: East 1 foot at 4 seconds. A chance of showers
and thunderstorms.
.SUNDAY...Southeast winds near 5 knots. Seas around 1 foot. Wave
Detail: East to southeast 1 foot at 3 seconds. A chance of
showers and thunderstorms.
.SUNDAY NIGHT...Southeast winds 5 to 10 knots. Seas 1 to 2 feet.
Wave Detail: East to southeast 1 foot at 3 seconds. A chance of
showers and thunderstorms.
.MONDAY...Southeast to south winds near 5 knots. Seas around 1
foot. A chance of showers and thunderstorms.
.MONDAY NIGHT...Southeast winds near 5 knots. Seas around 1 foot.
A chance of showers and thunderstorms.
.TUESDAY...East to southeast winds near 5 knots. Seas around
1 foot. A slight chance of showers and thunderstorms.
.TUESDAY NIGHT...East winds 5 to 10 knots, increasing to near 10
knots. Seas 1 to 2 feet, building to around 2 feet. A chance of
showers and thunderstorms.
.WEDNESDAY THROUGH THURSDAY NIGHT...East winds near 10 knots.
Seas 2 to 3 feet. A chance of showers and thunderstorms.

$$

GMZ033-034-060830-
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-
417 PM EDT Sat Sep 5 2026

.TONIGHT...East to southeast winds near 5 knots. Seas 1 foot or
less. A chance of showers and thunderstorms.
.SUNDAY...Southeast winds near 5 knots. Seas 1 foot or less. A
chance of showers and thunderstorms.
.SUNDAY NIGHT...South winds near 5 knots. Seas 1 foot or less. A
chance of showers and thunderstorms.
.MONDAY...South winds near 5 knots. Seas 1 foot or less. A chance
of showers and thunderstorms.
.MONDAY NIGHT...Southeast to south winds near 5 knots. Seas
1 foot or less. A chance of showers and thunderstorms.
.TUESDAY...Southeast winds near 5 knots. Seas 1 foot or less. A
chance of showers and thunderstorms.
.TUESDAY NIGHT...East winds 5 to 10 knots. Seas around 1 foot. A
chance of showers and thunderstorms.
.WEDNESDAY THROUGH THURSDAY NIGHT...East winds 5 to 10 knots.
Seas around 1 foot. A chance of showers and thunderstorms.

$$

BT/RG