Marine Weather and Tide Forecast for Key West, FL
 | Sunrise 6:38 AM Sunset 8:09 PM Moonrise 2:47 AM Moonset 3:37 PM |
GMZ075 Expires:202505232030;;001722 Fzus52 Kkey 230828 Cwfkey
coastal waters forecast for the florida keys national weather service key west fl 428 am edt Fri may 23 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.
gmz052>055-072>075-232030- 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- 428 am edt Fri may 23 2025
Today - East winds 5 to 10 knots, becoming northeast to east. Seas around 1 foot. Wave detail: east to southeast 1 foot at 3 seconds. Isolated showers and Thunderstorms.
Tonight - East winds 5 to 10 knots. Seas building to 1 to 2 feet. Wave detail: east 2 feet at 4 seconds. Isolated showers and Thunderstorms.
Saturday - East winds near 10 knots, increasing to 10 to 15 knots. Seas 1 to 2 feet. Wave detail: east 2 feet at 4 seconds. Isolated showers and Thunderstorms.
Saturday night - East winds 10 to 15 knots. Seas building to 2 to 3 feet. Scattered showers and isolated Thunderstorms.
Sunday - East winds 10 to 15 knots. Seas 2 to 3 feet. Isolated showers and Thunderstorms.
Sunday night and Monday - East to southeast winds near 15 knots. Seas 2 to 4 feet, occasionally to 5 feet. Isolated showers and Thunderstorms.
Monday night - East to southeast winds 15 to 20 knots. Seas 3 to 5 feet, occasionally to 6 feet. Isolated showers and Thunderstorms.
Tuesday - East to southeast winds near 15 knots. Seas subsiding to 2 to 4 feet, occasionally to 5 feet. Isolated showers and Thunderstorms.
Tuesday night - East winds 15 to 20 knots. Seas 3 to 5 feet, occasionally to 6 feet. Isolated showers and Thunderstorms.
coastal waters forecast for the florida keys national weather service key west fl 428 am edt Fri may 23 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.
gmz052>055-072>075-232030- 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- 428 am edt Fri may 23 2025
GMZ005 Synopsis For Keys Coastal Waters From Ocean Reef To Dry Tortugas 428 Am Edt Fri May 23 2025
Synopsis - Light to gentle breezes across the florida keys will prevail through Saturday. Shower and Thunderstorm chances increase over the weekend into next week as a low pressure system over the eastern conus moves into the atlantic and breezes shift southeasterly. Breezes may freshen to moderate to fresh over the straits of florida early next week.
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.
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.
7 Day Forecast for Marine Location Near Key West, FL
NEW! Add second zone forecast
| Sand Key Lighthouse Click for Map Fri -- 03:46 AM EDT Moonrise Fri -- 06:15 AM EDT 1.54 feet High Tide Fri -- 06:40 AM EDT Sunrise Fri -- 12:56 PM EDT -0.13 feet Low Tide Fri -- 04:35 PM EDT Moonset Fri -- 07:27 PM EDT 1.11 feet High Tide Fri -- 08:08 PM EDT Sunset Tide / Current data from XTide NOT FOR NAVIGATION |
Sand Key Lighthouse, Sand Key Channel, Florida, Tide feet
| 12 am |
| 0.2 |
| 1 am |
| 0.3 |
| 2 am |
| 0.6 |
| 3 am |
| 0.9 |
| 4 am |
| 1.2 |
| 5 am |
| 1.4 |
| 6 am |
| 1.5 |
| 7 am |
| 1.5 |
| 8 am |
| 1.3 |
| 9 am |
| 1 |
| 10 am |
| 0.6 |
| 11 am |
| 0.2 |
| 12 pm |
| -0 |
| 1 pm |
| -0.1 |
| 2 pm |
| -0 |
| 3 pm |
| 0.2 |
| 4 pm |
| 0.5 |
| 5 pm |
| 0.8 |
| 6 pm |
| 1 |
| 7 pm |
| 1.1 |
| 8 pm |
| 1.1 |
| 9 pm |
| 1 |
| 10 pm |
| 0.7 |
| 11 pm |
| 0.5 |
| Boca Grande Channel Click for Map Fri -- 01:31 AM EDT 0.00 knots Slack Fri -- 03:47 AM EDT Moonrise Fri -- 04:05 AM EDT 1.00 knots Max Flood Fri -- 06:41 AM EDT Sunrise Fri -- 07:17 AM EDT -0.00 knots Slack Fri -- 10:45 AM EDT -1.52 knots Max Ebb Fri -- 01:50 PM EDT 0.00 knots Slack Fri -- 04:36 PM EDT Moonset Fri -- 04:51 PM EDT 1.46 knots Max Flood Fri -- 08:08 PM EDT Sunset Fri -- 08:30 PM EDT -0.00 knots Slack Fri -- 11:31 PM EDT -1.31 knots Max Ebb Tide / Current data from XTide NOT FOR NAVIGATION |
Boca Grande Channel, Florida Current, knots
| 12 am |
| -0.9 |
| 1 am |
| -0.4 |
| 2 am |
| 0.3 |
| 3 am |
| 0.8 |
| 4 am |
| 1 |
| 5 am |
| 0.9 |
| 6 am |
| 0.6 |
| 7 am |
| 0.2 |
| 8 am |
| -0.4 |
| 9 am |
| -1 |
| 10 am |
| -1.4 |
| 11 am |
| -1.5 |
| 12 pm |
| -1.3 |
| 1 pm |
| -0.7 |
| 2 pm |
| 0.1 |
| 3 pm |
| 0.9 |
| 4 pm |
| 1.4 |
| 5 pm |
| 1.5 |
| 6 pm |
| 1.3 |
| 7 pm |
| 0.9 |
| 8 pm |
| 0.3 |
| 9 pm |
| -0.3 |
| 10 pm |
| -0.9 |
| 11 pm |
| -1.3 |
FXUS62 KKEY 230808 AFDKEY
Area Forecast Discussion National Weather Service Key West FL 408 AM EDT Fri May 23 2025
New DISCUSSION, MARINE, AVIATION
DISCUSSION
Issued at 317 AM EDT Fri May 23 2025
After a burst of activity near the Upper Keys last night, weather quieted down across the Florida Keys. Temperatures across the Keys decreased to the lower 80s, and the RAWS at Big Pine Key measured lows in the mid 70s. Radiational cooling is in effect. Dew Points remain in the mid 70s across the Keys, so muggy near summer conditions will continue for the foreseeable future. The KBYX radar does not detect any rain across the Keys during the early morning hours, and GOES-East Nighttime Microphysics observations highlight only occasional cumulus clouds over the nearshore waters. The forecast for today appears to be another normal summer day across the Keys.
Switching to the synoptic perspective, a well developed longwave ridge over the Yucatan Peninsula will keep dry air over the Florida Keys. Winds are forecast to veer southeast as high pressure begins to build over Ontario with a weak low level ridge forming over the southeastern United States. Southeasterly breezes mean a return to near normal rain and thunderstorm chances across the island chain for the start of next week. Areas of uncertainty will involve exactly where showers begin to develop, how much breezes freshen across the offshore waters, and how much dry air in the upper atmosphere will cap showers. Check back later, because a shift to summer patterns means more short lived, mesoscale-driven weather.
MARINE
Issued at 317 AM EDT Fri May 23 2025 No watches or warnings are in effect for the Florida Keys nearshore and offshore waters. From synopsis, light to gentle breezes across the Florida Keys will prevail through Saturday.
Shower and thunderstorm chances increase over the weekend into next week as a low pressure system over the eastern CONUS moves into the Atlantic and breezes shift southeasterly. Breezes may freshen to moderate to fresh over the Straits of Florida early next week.
AVIATION
(06Z TAFS)
Issued at 317 AM EDT Fri May 23 2025 VFR conditions are expected to prevail at both EYW and MTH terminals through the TAF period. Near surface winds will remain light and variable through around sunrise before becoming east to southeast at 3 to 9 knots and remaining east to southeast throughout the day.
CLIMATE
On this day in Keys Weather History, the daily record warm low temperature of 82F was recorded in Key West set back in 2008.
Temperature records for Key West date back to 1873.
Also, the daily record warm low temperature of 82F was recorded in Marathon set back on this date in 2019. Temperature records for Marathon date back to 1951.
OF NOTE In 1903, the Key West WFO moved from the Waite building to the Weather Bureau building at Front and Eaton streets (which is now located within the Truman Annex).
PRELIMINARY POINT TEMPS/POPS
Key West 90 81 90 80 / 10 10 10 20 Marathon 89 81 89 81 / 10 10 20 30
KEY WATCHES/WARNINGS/ADVISORIES
FL...None.
GM...None.
Area Forecast Discussion National Weather Service Key West FL 408 AM EDT Fri May 23 2025
New DISCUSSION, MARINE, AVIATION
DISCUSSION
Issued at 317 AM EDT Fri May 23 2025
After a burst of activity near the Upper Keys last night, weather quieted down across the Florida Keys. Temperatures across the Keys decreased to the lower 80s, and the RAWS at Big Pine Key measured lows in the mid 70s. Radiational cooling is in effect. Dew Points remain in the mid 70s across the Keys, so muggy near summer conditions will continue for the foreseeable future. The KBYX radar does not detect any rain across the Keys during the early morning hours, and GOES-East Nighttime Microphysics observations highlight only occasional cumulus clouds over the nearshore waters. The forecast for today appears to be another normal summer day across the Keys.
Switching to the synoptic perspective, a well developed longwave ridge over the Yucatan Peninsula will keep dry air over the Florida Keys. Winds are forecast to veer southeast as high pressure begins to build over Ontario with a weak low level ridge forming over the southeastern United States. Southeasterly breezes mean a return to near normal rain and thunderstorm chances across the island chain for the start of next week. Areas of uncertainty will involve exactly where showers begin to develop, how much breezes freshen across the offshore waters, and how much dry air in the upper atmosphere will cap showers. Check back later, because a shift to summer patterns means more short lived, mesoscale-driven weather.
MARINE
Issued at 317 AM EDT Fri May 23 2025 No watches or warnings are in effect for the Florida Keys nearshore and offshore waters. From synopsis, light to gentle breezes across the Florida Keys will prevail through Saturday.
Shower and thunderstorm chances increase over the weekend into next week as a low pressure system over the eastern CONUS moves into the Atlantic and breezes shift southeasterly. Breezes may freshen to moderate to fresh over the Straits of Florida early next week.
AVIATION
(06Z TAFS)
Issued at 317 AM EDT Fri May 23 2025 VFR conditions are expected to prevail at both EYW and MTH terminals through the TAF period. Near surface winds will remain light and variable through around sunrise before becoming east to southeast at 3 to 9 knots and remaining east to southeast throughout the day.
CLIMATE
On this day in Keys Weather History, the daily record warm low temperature of 82F was recorded in Key West set back in 2008.
Temperature records for Key West date back to 1873.
Also, the daily record warm low temperature of 82F was recorded in Marathon set back on this date in 2019. Temperature records for Marathon date back to 1951.
OF NOTE In 1903, the Key West WFO moved from the Waite building to the Weather Bureau building at Front and Eaton streets (which is now located within the Truman Annex).
PRELIMINARY POINT TEMPS/POPS
Key West 90 81 90 80 / 10 10 10 20 Marathon 89 81 89 81 / 10 10 20 30
KEY WATCHES/WARNINGS/ADVISORIES
FL...None.
GM...None.
| Stations | Dist | Age | Wind | Air | Water | Waves | inHg | DewPt |
| 42095 | 13 mi | 48 min | 82°F | 83°F | 1 ft | |||
| SANF1 - Sand Key, FL | 15 mi | 18 min | NNW 4.1G | 82°F | 30.00 | 75°F | ||
| KYWF1 - 8724580 - Key West, FL | 17 mi | 48 min | NNE 1.9G | 82°F | 88°F | 30.02 |
Wind History for Key West, FL
toggle option: (graph/table)
Link to 1 hour of 5 minute data for KEYW
Terminal Aerodrome Forecast (TAF) for KEYW
Wind History Graph: EYW
(wind in knots)
GEOS Local Image of Southeast
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Key West, FL,
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