HomeForecastsFlorida ForecastsMatecumbe Harbor, FL - Lower Matecumbe Key, Fla. Bay Coastal Forecast

Matecumbe Harbor, FL - Lower Matecumbe Key, Fla. Bay Coastal Forecast

FZUS52 KKEY 272030
CWFKEY

Coastal Waters Forecast for the Florida Keys
National Weather Service Key West FL
430 PM EDT Tue May 27 2025

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.

Wave Detail will include details about the period and direction
of origin for the highest energy waves. Long-period swells coming
from a different direction than the wind would be included in the
Wave Detail.

GMZ005-280830-
Synopsis for Keys coastal waters from Ocean Reef to Dry Tortugas
430 PM EDT Tue May 27 2025

.SYNOPSIS...High pressure will remain entrenched over the western
North Atlantic for the next several days, meandering and
fluctuating in strength slightly day to day. This will lead to
Gentle to moderate east to southeast breezes, occasionally
becoming southeasterly. In the Straits of Florida, breezes may
occasionally become moderate to fresh. Breezes will peak late
evening into the morning hours and lull in the afternoon. Looking
ahead, guidance suggests a shift in the pattern that may lead to
an increase in the potential for showers and thunderstorms near
the end of the week, but details will continue to be sparse until
we get closer to that time.

The Approximate Shoreward Edge of the Gulf Stream as of May 23rd...

51 NM South of Dry Tortugas Light...on Loggerhead Key.
21 NM South of Cosgrove Shoal Light...off the Marquesas Keys.
16 NM South of Sand Key Light...off Key West.
8 NM South of Looe Key...off Big Pine Key.
8 NM South of Sombrero Key Light...off Marathon.
8 NM Southeast of Alligator Reef Light...off Islamorada.
4 NM Southeast of Molasses Reef Light...off Key Largo.
2 NM East of Carysfort Reef Light...off Ocean Reef.

Gulf Stream Information Courtesy of the National Weather Service in
Key West based on products from NASA SPoRT.

$$

GMZ031-280830-
Florida Bay including Barnes Sound, Blackwater Sound, and
Buttonwood Sound-
430 PM EDT Tue May 27 2025

.TONIGHT...East to southeast winds 10 to 15 knots. Bay waters a
light to moderate chop. Isolated showers and thunderstorms.
.WEDNESDAY...Southeast winds 10 to 15 knots, becoming east to
southeast and decreasing to near 10 knots. Bay waters a light to
moderate chop, becoming a light chop. Isolated showers and
thunderstorms.
.WEDNESDAY NIGHT...East to southeast winds near 10 knots,
increasing to 10 to 15 knots. Bay waters a light chop, becoming a
light to moderate chop. Isolated showers and thunderstorms.
.THURSDAY...Southeast winds near 10 knots. Bay waters a light
chop. Isolated showers and thunderstorms.
.THURSDAY NIGHT...Southeast winds near 10 knots. Bay waters a
light chop. Isolated showers and thunderstorms.
.FRIDAY...Southeast to south winds near 10 knots, becoming south
to southwest and decreasing to near 5 knots. Bay waters a light
chop, becoming smooth. Isolated showers and thunderstorms.
.FRIDAY NIGHT...South to southwest winds near 5 knots, becoming
southwest to west and increasing to near 10 knots. Bay waters
smooth, becoming a light chop. Isolated showers and thunderstorms.
.SATURDAY...Southwest to west winds near 10 knots, increasing to
near 15 knots. Bay waters a light chop, becoming a moderate chop.
Scattered showers and isolated thunderstorms.
.SATURDAY NIGHT...West winds 10 to 15 knots, becoming southwest to
west and decreasing to near 10 knots. Bay waters a light to
moderate chop, becoming a light chop. Scattered showers and
isolated thunderstorms.
.SUNDAY...Southwest to west winds 5 to 10 knots. Bay waters
smooth to a light chop. Scattered showers and isolated
thunderstorms.
.SUNDAY NIGHT...Southwest winds near 5 knots. Bay waters smooth.
Scattered showers and isolated thunderstorms.

$$

GMZ032-035-280830-
Bayside and Gulf side from Craig Key to west end of Seven Mile
Bridge-
Gulf of Mexico from west end of Seven Mile Bridge to Halfmoon
Shoal out to 5 Fathoms-
430 PM EDT Tue May 27 2025

.TONIGHT...East to southeast winds 10 to 15 knots, increasing to
near 15 knots. Seas 1 to 2 feet, except building to 2 to 3 feet
west of the Marquesas Keys. Nearshore waters a light to moderate
chop, becoming a moderate chop. Isolated showers and
thunderstorms.
.WEDNESDAY...Southeast winds 10 to 15 knots, becoming east to
southeast and decreasing to near 10 knots. Seas 1 to 2 feet,
except around 2 feet west of the Marquesas Keys. Nearshore waters
a light to moderate chop, becoming a light chop. Isolated showers
and thunderstorms.
.WEDNESDAY NIGHT...East to southeast winds 10 to 15 knots. Seas
1 to 2 feet, except around 2 feet west of the Marquesas Keys.
Nearshore waters a light to moderate chop. Isolated showers and
thunderstorms.
.THURSDAY...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. Isolated showers and thunderstorms.
.THURSDAY NIGHT...Southeast winds near 10 knots. Seas around 1
foot. Nearshore waters a light chop. Isolated showers and
thunderstorms.
.FRIDAY...Southeast to south winds 5 to 10 knots, becoming south
to southwest and decreasing to near 5 knots. Seas 1 foot or less.
Nearshore waters smooth to a light chop, becoming smooth.
Isolated showers and thunderstorms.
.FRIDAY NIGHT...Southwest winds near 5 knots, becoming southwest
to west and increasing to near 10 knots. Seas 1 foot or less,
building to around 1 foot. Nearshore waters smooth, becoming a
light chop. Scattered showers and isolated thunderstorms.
.SATURDAY...Southwest to west winds near 10 knots, increasing to
near 15 knots. Seas 1 to 2 feet, building to around 2 feet.
Nearshore waters a light chop, becoming a moderate chop. Scattered
showers and isolated thunderstorms.
.SATURDAY NIGHT...West to northwest winds 10 to 15 knots,
becoming southwest to west and decreasing to 5 to 10 knots. Seas
1 to 2 feet. Nearshore waters a light to moderate chop, becoming
smooth to a light chop. Scattered showers and isolated
thunderstorms.
.SUNDAY...West winds 5 to 10 knots. Seas 1 to 2 feet. Nearshore
waters smooth to a light chop. Scattered showers and isolated
thunderstorms.
.SUNDAY NIGHT...West to northwest winds near 5 knots, becoming
south to southwest after midnight. Seas 1 foot or less. Nearshore
waters smooth. Scattered showers and isolated thunderstorms.

$$

GMZ042>044-280830-
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-
430 PM EDT Tue May 27 2025

.TONIGHT...East to southeast winds 10 to 15 knots, increasing to
near 15 knots. Seas 2 to 3 feet. Nearshore waters a light to
moderate chop, becoming a moderate chop. Isolated showers and
thunderstorms.
.WEDNESDAY...East to southeast winds near 15 knots, decreasing to
near 10 knots. Seas 2 to 3 feet. Nearshore waters a moderate
chop, becoming a light chop. Isolated showers and thunderstorms.
.WEDNESDAY NIGHT...East to southeast winds 10 to 15 knots,
increasing to near 15 knots. Seas 2 to 3 feet. Nearshore waters a
light to moderate chop, becoming a moderate chop. Isolated
showers and thunderstorms.
.THURSDAY...Southeast winds 10 to 15 knots, becoming east to
southeast and decreasing to near 10 knots. Seas 2 to 3 feet,
subsiding to around 2 feet. Nearshore waters a light to moderate
chop, becoming a light chop. Isolated showers and thunderstorms.
.THURSDAY NIGHT...East to southeast winds 10 to 15 knots, becoming
southeast to south. Seas around 2 feet. Nearshore waters a light
to moderate chop. Isolated showers and thunderstorms.
.FRIDAY...Southeast to south winds near 10 knots, becoming south
to southwest and decreasing to near 5 knots. Seas 1 to 2 feet,
subsiding to around 1 foot. Nearshore waters a light chop,
becoming smooth. Isolated showers and thunderstorms.
.FRIDAY NIGHT...South to southwest winds near 5 knots, becoming
southwest to west and increasing to near 10 knots. Seas around 1
foot. Nearshore waters smooth, becoming a light chop. Isolated
showers and thunderstorms.
.SATURDAY...Southwest to west winds 10 to 15 knots. Seas 1 to 2
feet. Nearshore waters a light to moderate chop. Scattered
showers and isolated thunderstorms.
.SATURDAY NIGHT...West to northwest winds 10 to 15 knots,
becoming southwest to west and decreasing 5 to 10 knots. Seas 1
to 2 feet. Nearshore waters a light to moderate chop, becoming
smooth to a light chop. Scattered showers and isolated
thunderstorms.
.SUNDAY...West winds 5 to 10 knots. Seas 1 to 2 feet. Nearshore
waters smooth to a light chop. Scattered showers and isolated
thunderstorms.
.SUNDAY NIGHT...West winds near 5 knots, becoming south to
southwest after midnight. Seas 1 to 2 feet, except around 2 feet
west of Cosgrove Shoal Light. Nearshore waters smooth. Scattered
showers and isolated thunderstorms.

$$

GMZ052>055-072>075-280830-
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-
430 PM EDT Tue May 27 2025

.TONIGHT...East to southeast winds 10 to 15 knots, increasing to
near 15 knots. Seas 2 to 4 feet, occasionally to 5 feet. Wave
Detail: East 3 feet at 5 seconds. Isolated showers and
thunderstorms.
.WEDNESDAY...East to southeast winds near 15 knots, decreasing to 10
to 15 knots. Seas 2 to 4 feet, occasionally to 5 feet. Wave
Detail: East to southeast 3 feet at 5 seconds. Isolated showers
and thunderstorms.
.WEDNESDAY NIGHT...East to southeast winds 10 to 15 knots,
increasing to near 15 knots. Seas 2 to 4 feet, occasionally to 5
feet. Isolated showers and thunderstorms.
.THURSDAY...East to southeast winds 10 to 15 knots. Seas 2 to
3 feet. Isolated showers and thunderstorms.
.THURSDAY NIGHT...East to southeast winds 10 to 15 knots. Seas
2 to 3 feet. Isolated showers and thunderstorms.
.FRIDAY...Southeast to south winds near 10 knots, becoming south
to southwest and decreasing to 5 to 10 knots. Seas around 2 feet,
subsiding to 1 to 2 feet. Isolated showers and thunderstorms.
.FRIDAY NIGHT...South to southwest winds near 5 knots, becoming
southwest to west and increasing near 10 knots. Seas 1 to 2 feet,
building to around 2 feet. Isolated showers and thunderstorms.
.SATURDAY...Southwest to west winds 10 to 15 knots. Seas around 2
feet. Scattered showers and isolated thunderstorms.
.SATURDAY NIGHT...West to northwest winds near 10 knots, becoming
southwest to west and decreasing to 5 to 10 knots. Seas 1 to 2
feet. Scattered showers and isolated thunderstorms.
.SUNDAY...West winds 5 to 10 knots. Seas 1 to 2 feet. Scattered
showers and isolated thunderstorms.
.SUNDAY NIGHT...Northeast winds near 5 knots, becoming south
after midnight. Seas 1 to 2 feet. Scattered showers and isolated
thunderstorms.

$$

GMZ033-034-280830-
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-
430 PM EDT Tue May 27 2025

.TONIGHT...East to southeast winds 10 to 15 knots. Seas 1 to
3 feet. Wave Detail: East to southeast 2 feet at 4 seconds.
Isolated showers and thunderstorms.
.WEDNESDAY...Southeast winds 10 to 15 knots, becoming east to
southeast and decreasing to near 10 knots. Seas 1 to 3 feet,
subsiding to 1 to 2 feet. Wave Detail: Southeast 2 feet at 4
seconds. Isolated showers and thunderstorms.
.WEDNESDAY NIGHT...East to southeast winds 10 to 15 knots. Seas
1 to 3 feet. Isolated showers and thunderstorms.
.THURSDAY...Southeast winds near 10 knots. Seas 1 to 2 feet.
Isolated showers and thunderstorms.
.THURSDAY NIGHT...Southeast winds near 10 knots. Seas 1 to 2 feet.
Isolated showers and thunderstorms.
.FRIDAY...Southeast to south winds 5 to 10 knots, becoming south
to southwest. Seas around 1 foot. Isolated showers and
thunderstorms.
.FRIDAY NIGHT...Southwest to west winds 5 to 10 knots, increasing
to near 10 knots. Seas around 1 foot, building to 1 to 2 feet.
Scattered showers and isolated thunderstorms.
.SATURDAY...West winds 10 to 15 knots. Seas around 2 feet.
Scattered showers and isolated thunderstorms.
.SATURDAY NIGHT...West winds 10 to 15 knots, decreasing to 5 to
10 knots. Seas 2 to 3 feet, subsiding to 1 to 2 feet. Scattered
showers and isolated thunderstorms.
.SUNDAY...West winds 5 to 10 knots. Seas 1 to 2 feet. Isolated
showers and thunderstorms.
.SUNDAY NIGHT...West winds near 5 knots, becoming south to
southwest around 5 knots after midnight. Seas 1 to 2 feet.
Scattered showers and isolated thunderstorms.

$$


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