343
FZUS52 KKEY 131427
CWFKEY

Coastal Waters Forecast for the Florida Keys
National Weather Service Key West FL
1027 AM EDT Sun Sep 13 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.

GMZ005-140230-
Synopsis for Keys coastal waters from Ocean Reef to Dry Tortugas
1027 AM EDT Sun Sep 13 2026

.SYNOPSIS...
A weak pressure pattern today will result in light and varying
breezes. Breezes will gradually firm up out of the northeast to
east over the next few days, as a continental high builds
southward towards our area. Low level moisture will remain
abundant through at least today, and keep convective potential
above normal. Rain chances should fall to near normal early in the
week as drier lower levels filter in. The ridge will be
reinforced through the first half of the week, resulting in
freshening northeast to easterly breezes.

The Approximate Shoreward Edge of the Gulf Stream as of September
11, 2026...

26 NM south of Dry Tortugas Light, on Loggerhead Key
15 NM south of Cosgrove Shoal Light, off the Marquesas Keys
15 NM south of Sand Key Light, off Key West
11 NM south-southeast of Looe Key, off Big Pine Key
 8 NM southeast of Sombrero Key Light, off Marathon
 6 NM southeast of Alligator Reef Light, off Islamorada
 2 NM southeast of Molasses Reef Light, off Key Largo
 1 NM east-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.

$$

GMZ031-140230-
Florida Bay including Barnes Sound, Blackwater Sound, and
Buttonwood Sound-
1027 AM EDT Sun Sep 13 2026

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

$$

GMZ032-035-140230-
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-
1027 AM EDT Sun Sep 13 2026

.THIS AFTERNOON...Southeast to south winds 5 to 10 knots,
becoming variable near 5 knots. Seas 1 foot or less. Nearshore
waters smooth to a light chop, becoming smooth. A chance of
showers and thunderstorms.
.TONIGHT...Variable winds near 5 knots, becoming east to
southeast. Seas 1 foot or less. Nearshore waters smooth. A chance
of showers and thunderstorms.
.MONDAY...East winds near 5 knots. Seas 1 foot or less. Nearshore
waters smooth. A chance of showers and thunderstorms.
.MONDAY NIGHT...East winds 5 to 10 knots, increasing to near 10
knots. Seas building to around 1 foot. Nearshore waters smooth to
a light chop, becoming a light chop. A chance of showers and
thunderstorms.
.TUESDAY...East winds near 10 knots, increasing to 10 to 15 knots.
Seas around 1 foot, building to 1 to 12 feet. Nearshore waters a
light chop, becoming a light to moderate chop. Showers likely with
a chance of thunderstorms.
.TUESDAY NIGHT...Northeast to east winds near 15 knots. Seas 1 to
2 feet. Nearshore waters a moderate chop. Showers likely with a
chance of thunderstorms.
.WEDNESDAY...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.
.WEDNESDAY NIGHT...Northeast to east winds near 15 knots. Seas 1
to 2 feet. Nearshore waters a moderate chop. Showers 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 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
likely with a chance of thunderstorms.

$$

GMZ042>044-140230-
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-
1027 AM EDT Sun Sep 13 2026

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

$$

GMZ052>055-072>075-140230-
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-
1027 AM EDT Sun Sep 13 2026

.THIS AFTERNOON...Southeast to south winds near 10 knots,
becoming variable near 5 knots. Seas around 2 feet, subsiding to 1
to 2 feet. Wave Detail: East to southeast 1 foot at 3 seconds. A
chance of showers and thunderstorms.
.TONIGHT...Variable winds near 5 knots, becoming east to
southeast 5 to 10 knots. Seas around 1 foot, building to 1 to 2
feet. Wave Detail: East 1 foot at 3 seconds. A chance of showers
and thunderstorms.
.MONDAY...Northeast to east winds 5 to 10 knots. Seas 1 to 2 feet.
Wave Detail: East 1 foot at 3 seconds. A chance of showers and
thunderstorms.
.MONDAY NIGHT...East winds near 10 knots. Seas 1 to 2 feet. A
chance of showers and thunderstorms.
.TUESDAY...East winds near 10 knots, increasing to 10 to 15
knots. Seas around 2 feet. A chance of showers and thunderstorms.
.TUESDAY NIGHT...Northeast to east winds near 15 knots. Seas
building to 2 to 4 feet, occasionally to 5 feet. Showers likely
with a chance of thunderstorms.
.WEDNESDAY...East winds 10 to 15 knots. Seas 2 to 3 feet. A
chance of showers and thunderstorms.
.WEDNESDAY NIGHT...East winds near 15 knots. Seas 2 to 4 feet,
occasionally to 5 feet. Showers likely with a chance of
thunderstorms.
.THURSDAY...East winds 10 to 15 knots. Seas 2 to 3 feet. Showers
likely with a chance of thunderstorms.
.THURSDAY NIGHT...East to southeast winds 10 to 15 knots. Seas
2 to 3 feet. Showers likely with a chance of thunderstorms.

$$

GMZ033-034-140230-
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-
1027 AM EDT Sun Sep 13 2026

.THIS AFTERNOON...Southeast to south winds near 10 knots,
becoming variable near 5 knots. Seas around 1 foot, subsiding to 1
foot or less. A chance of showers and thunderstorms.
.TONIGHT...Northeast winds near 5 knots. Seas 1 foot or less. A
chance of showers and thunderstorms.
.MONDAY...Northeast winds near 5 knots. Seas 1 foot or less. A
chance of showers and thunderstorms.
.MONDAY NIGHT...Northeast to east winds 5 to 10 knots. Seas
1 foot or less. Showers likely with a chance of thunderstorms.
.TUESDAY...East winds near 10 knots. Seas around 1 foot. Showers
likely with a chance of thunderstorms.
.TUESDAY NIGHT...Northeast to east winds near 10 knots,
increasing to near 15 knots. Seas 1 to 2 feet, building to 2 to 3
feet. Showers likely with a chance of thunderstorms.
.WEDNESDAY...Northeast to east winds 10 to 15 knots. Seas 2 to
3 feet. Showers likely with a chance of thunderstorms.
.WEDNESDAY NIGHT...Northeast to east winds near 15 knots. Seas
building to 2 to 4 feet, occasionally to 5 feet. Showers and
thunderstorms likely.
.THURSDAY...East winds 10 to 15 knots. Seas 2 to 3 feet. Showers
and thunderstorms likely.
.THURSDAY NIGHT...East winds 10 to 15 knots. Seas around 2 feet.
Showers with a chance of thunderstorms.

$$

BT/11