877
FZUS52 KKEY 102025
CWFKEY

Coastal Waters Forecast for the Florida Keys
National Weather Service Key West FL
425 PM EDT Mon Aug 10 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.

GMZ005-110830-
Synopsis for Keys coastal waters from Ocean Reef to Dry Tortugas
425 PM EDT Mon Aug 10 2026

.SYNOPSIS...Ridging across northern Florida will steadily shift
southwards into Central and South Florida over the next few days.
Gentle to moderate breezes will gradually trend downwards to a
light to gentle breeze through this period. Winds are expected to
freshen late in the week and over the start of the weekend as the
ridge lifts back into northern Florida and a broad lower level
trough moves westward across our area.

The Approximate Shoreward Edge of the Gulf Stream as of
August 7, 2026...

25 NM South of Dry Tortugas Light...on Loggerhead Key.
15 NM South of Cosgrove Shoal Light...off the Marquesas Keys.
19 NM South of Sand Key Light...off Key West.
29 NM South of Looe Key...off Big Pine Key.
16 NM Southeast of Sombrero Key Light...off Marathon.
 4 NM Southeast of Alligator Reef Light...off Islamorada.
 2 NM Southeast of Molasses Reef Light...off Key Largo.
 1 NM 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.

$$

GMZ031-110830-
Florida Bay including Barnes Sound, Blackwater Sound, and
Buttonwood Sound-
425 PM EDT Mon Aug 10 2026

.TONIGHT...East winds 10 to 15 knots. Bay waters a light to
moderate chop. A slight chance of showers and thunderstorms.
.TUESDAY...East to southeast winds 10 to 15 knots early,
decreasing to near 10 knots. Bay waters a light to moderate chop,
becoming a light chop. A slight chance of showers and
thunderstorms.
.TUESDAY NIGHT...East winds near 10 knots, decreasing to 5 to 10
knots. Bay waters a light chop, becoming smooth to a light chop.
A slight chance of showers and thunderstorms.
.WEDNESDAY...East to southeast winds 5 to 10 knots. Bay waters
smooth to a light chop. A slight chance of showers and
thunderstorms.
.WEDNESDAY NIGHT...East to southeast winds near 5 knots. Bay
waters smooth.
.THURSDAY...East to southeast winds near 5 knots. Bay waters
smooth. A slight chance of showers and thunderstorms.
.THURSDAY NIGHT...East winds increasing to 5 to 10 knots. Bay
waters becoming smooth to a light chop.
.FRIDAY...East winds near 10 knots, increasing to 10 to 15 knots.
Bay waters a light chop, becoming a light to moderate chop. A
slight chance of showers and thunderstorms.
.FRIDAY NIGHT...East winds 10 to 15 knots. Bay waters a light to
moderate chop. A chance of showers and thunderstorms.
.SATURDAY...East to southeast winds 10 to 15 knots. Bay waters a
light to moderate chop. A slight chance of showers and
thunderstorms.
.SATURDAY NIGHT...East to southeast winds 10 to 15 knots. Bay
waters a light to moderate chop. A slight chance of showers.

$$

GMZ032-035-110830-
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 PM EDT Mon Aug 10 2026

.TONIGHT...East winds 10 to 15 knots. Seas 1 to 2 feet, except 2
to 3 feet west of the Marquesas Keys. Nearshore waters a light to
moderate chop. A slight chance of showers and thunderstorms.
.TUESDAY...East winds 10 to 15 knots early, decreasing to near 10
knots. Seas 1 to 2 feet, subsiding to around 1 foot. Nearshore
waters a light to moderate chop, becoming a light chop. A slight
chance of showers and thunderstorms.
.TUESDAY NIGHT...East to southeast winds 5 to 10 knots. Seas
around 1 foot. Nearshore waters smooth to a light chop. A slight
chance of showers and thunderstorms.
.WEDNESDAY...East to southeast winds 5 to 10 knots. Seas around 1
foot. Nearshore waters smooth to a light chop. A slight 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.
.THURSDAY...East to southeast winds near 5 knots. Seas 1 foot or
less. Nearshore waters smooth. A slight chance of showers and
thunderstorms.
.THURSDAY NIGHT...East winds near 5 knots, increasing to 5 to 10
knots. Seas 1 foot or less, building to around 1 foot. Nearshore
waters smooth, becoming smooth to a light chop.
.FRIDAY...East winds near 10 knots, increasing to 10 to 15 knots.
Seas around 1 foot, building to 1 to 2 feet. Nearshore waters a
light chop, becoming a light to moderate chop. A slight chance of
showers and thunderstorms.
.FRIDAY NIGHT...East winds 10 to 15 knots. Seas 1 to 2 feet.
Nearshore waters a moderate chop. A chance of showers and
thunderstorms.
.SATURDAY...East to southeast winds 10 to 15 knots, increasing to
near 15 knots. Seas 1 to 2 feet, building to around 2 feet.
Nearshore waters a light to moderate chop, becoming a moderate
chop. A slight chance of showers and thunderstorms.
.SATURDAY NIGHT...East to southeast winds near 15 knots. Seas 2
to 3 feet. Nearshore waters a moderate chop. A slight chance of
showers and thunderstorms.

$$

GMZ042>044-110830-
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 PM EDT Mon Aug 10 2026

.TONIGHT...East winds 10 to 15 knots. Seas 2 to 3 feet. Nearshore
waters a light to moderate chop. A slight chance of showers and
thunderstorms.
.TUESDAY...East winds 10 to 15 knots early, decreasing to near 10
knots. Seas 2 to 3 feet. Nearshore waters a light to moderate
chop, becoming a light chop. A slight chance of showers and
thunderstorms.
.TUESDAY NIGHT...East winds decreasing to 5 to 10 knots. Seas
subsiding to 1 to 2 feet. Nearshore waters becoming smooth to a
light chop. A slight chance of showers and thunderstorms.
.WEDNESDAY...East winds 5 to 10 knots. Seas 1 to 2 feet.
Nearshore waters smooth to a light chop.
.WEDNESDAY NIGHT...East winds 5 to 10 knots. Seas around 1 foot.
Nearshore waters smooth to a light chop.
.THURSDAY...East winds 5 to 10 knots. Seas around 1 foot.
Nearshore waters smooth to a light chop. A slight chance of
showers and thunderstorms.
.THURSDAY NIGHT...East winds 5 to 10 knots. Seas 1 to 2 feet.
Nearshore waters smooth to a light chop.
.FRIDAY...East winds near 10 knots, 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 slight chance of
showers and thunderstorms.
.FRIDAY NIGHT...East winds near 15 knots. Seas 2 to 3 feet.
Nearshore waters a moderate chop. A chance of showers and
thunderstorms.
.SATURDAY...East to southeast winds 10 to 15 knots. Seas 2 to
3 feet. Nearshore waters a light to moderate chop. A slight
chance of showers.
.SATURDAY NIGHT...East to southeast winds increasing to near 15
knots. Seas building to 2 to 4 feet, occasionally to 5 feet.
Nearshore waters becoming a moderate chop. A slight chance of
showers.

$$

GMZ052>055-072>075-110830-
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 PM EDT Mon Aug 10 2026

.TONIGHT...East winds near 15 knots. Seas 2 to 4 feet,
occasionally to 5 feet. Wave Detail: East 4 feet at 5 seconds.
.TUESDAY...East winds near 15 knots early, decreasing to 10 to 15
knots. Seas 2 to 4 feet, occasionally to 5 feet. Wave Detail:
East 3 feet at 5 seconds. A slight chance of showers and
thunderstorms.
.TUESDAY NIGHT...East winds 10 to 15 knots. Seas 2 to 3 feet.
Wave Detail: East 3 feet at 5 seconds. A slight chance of showers
and thunderstorms.
.WEDNESDAY...East winds near 10 knots. Seas 2 to 3 feet.
.WEDNESDAY NIGHT...East winds 10 to 15 knots. Seas 2 to 3 feet.
.THURSDAY...East winds near 10 knots. Seas 1 to 2 feet. A slight
chance of showers and thunderstorms.
.THURSDAY NIGHT...East winds 10 to 15 knots. Seas 2 to 3 feet.
.FRIDAY...East winds 10 to 15 knots. Seas 2 to 3 feet. A chance
of showers and thunderstorms.
.FRIDAY NIGHT...East winds near increasing to 15 knots. Seas
building to 3 to 4 feet, occasionally to 5 feet. A chance of
showers and thunderstorms.
.SATURDAY...East winds 10 to 15 knots. Seas 3 to 4 feet,
occasionally to 5 feet. A slight chance of showers and
thunderstorms.
.SATURDAY NIGHT...East winds increasing to near 15 knots. Seas 3
to 5 feet, occasionally to 6 feet. A slight chance of showers.

$$

GMZ033-034-110830-
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 PM EDT Mon Aug 10 2026

.TONIGHT...East winds 10 to 15 knots. Seas 1 to 3 feet. Wave
Detail: East 2 feet at 4 seconds. A slight chance of showers and
thunderstorms.
.TUESDAY...East winds 10 to 15 knots early, decreasing to 5 to 10
knots. Seas 1 to 2 feet. Wave Detail: East 2 feet at 4 seconds. A
slight chance of showers and thunderstorms.
.TUESDAY NIGHT...East to southeast winds 5 to 10 knots. Seas 1 to
2 feet. Wave Detail: East 1 foot at 3 seconds. A slight chance of
showers and thunderstorms.
.WEDNESDAY...East winds 5 to 10 knots. Seas 1 foot or less.
.WEDNESDAY NIGHT...Northeast winds 5 to 10 knots, becoming east.
Seas 1 foot or less. A slight chance of showers and
thunderstorms.
.THURSDAY...East winds near 5 knots. Seas around 1 foot. A slight
chance of showers and thunderstorms.
.THURSDAY NIGHT...East winds 5 to 10 knots. Seas around 1 foot. A
slight chance of showers and thunderstorms.
.FRIDAY...East winds 5 to 10 knots. Seas 1 to 2 feet. A slight
chance of showers and thunderstorms.
.FRIDAY NIGHT...East winds near 10 knots, increasing to 10 to 15
knots. Seas 1 to 2 feet. A chance of showers and thunderstorms.
.SATURDAY...East to southeast winds near 10 knots, increasing to
10 to 15 knots. Seas 1 to 2 feet, building to around 2 feet. A
slight chance of showers and thunderstorms.
.SATURDAY NIGHT...East to southeast winds increasing to near 15
knots. Seas building to 2 to 4 feet, occasionally to 5 feet. A
slight chance of showers and thunderstorms.

$$