Marine Weather and Tide Forecast for Key Colony Beach, FL
 | Sunrise 7:12 AM Sunset 6:03 PM Moonrise 8:30 AM Moonset 7:54 PM |
Marine Forecasts
NOTE: Zones were updated 3/20/2025. If your report is out of date, please click Edit
GMZ053 Expires:202601201530;;190535 Fzus52 Kkey 200322 Cwfkey
coastal waters forecast for the florida keys national weather service key west fl 1022 pm est Mon jan 19 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.
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>075-201530- 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- 1022 pm est Mon jan 19 2026
.small craft advisory in effect - .
Overnight - North to northeast winds near 20 knots, increasing to 20 to 25 knots. Seas 5 to 7 feet, occasionally to 9 feet, building to 6 to 8 feet, occasionally to 10 feet. Wave detail: northeast 7 feet at 7 seconds and west to northwest 3 feet at 8 seconds. Isolated showers.
Tuesday - North to northeast winds 20 to 25 knots, becoming northeast. Seas 6 to 9 feet, occasionally to 11 feet. Wave detail: northeast 8 feet at 7 seconds and west to northwest 1 foot at 7 seconds. Isolated showers.
Tuesday night - Northeast winds near 25 knots. Seas 7 to 9 feet, occasionally to 11 feet. Wave detail: northeast 9 feet at 7 seconds. Isolated showers.
Wednesday - Northeast to east winds near 25 knots, decreasing to 20 to 25 knots. Seas 7 to 9 feet, occasionally to 11 feet. Scattered showers.
Wednesday night - Northeast to east winds near 20 knots, decreasing to 15 to 20 knots. Seas 6 to 8 feet, occasionally to 10 feet, subsiding to 5 to 7 feet, occasionally to 9 feet. Scattered showers.
Thursday - Northeast to east winds near 15 knots, decreasing to 10 to 15 knots. Seas 4 to 6 feet, occasionally to 8 feet, subsiding to 2 to 4 feet, occasionally to 5 feet. Scattered showers.
Thursday night - Northeast winds near 15 knots. Seas 2 to 4 feet, occasionally to 5 feet. Scattered showers.
Friday and Friday night - Northeast to east winds 10 to 15 knots. Seas 2 to 4 feet, occasionally to 5 feet. Isolated showers.
Saturday and Saturday night - Northeast to east winds 10 to 15 knots. Seas 2 to 3 feet. Isolated showers.
coastal waters forecast for the florida keys national weather service key west fl 1022 pm est Mon jan 19 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.
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>075-201530- 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- 1022 pm est Mon jan 19 2026
GMZ005 Synopsis For Keys Coastal Waters From Ocean Reef To Dry Tortugas 1022 Pm Est Mon Jan 19 2026
Synopsis - An expansive high pressure system will move across the eastern united states over the next several days, leading to a strengthening pressure gradient. This will continue to promote bouts of fresh to strong breezes throughout the work week. The high will move out into the western north atlantic mid- late week while weakening. This will support slackening breezes for Friday night and Saturday.
the approximate shoreward edge of the gulf stream as of january 18 - .
18 nm south of dry tortugas light - .on loggerhead key. 16 nm south of cosgrove shoal light - .off the marquesas keys. 15 nm south of sand key light - .off key west. 13 nm south of looe key - .off big pine key. 13 nm southeast of sombrero key light - .off marathon. 12 nm southeast of alligator reef light - .off islamorada. 7 nm southeast of molasses reef light - .off key largo. 4 nm southeast 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 and rtofs.
the approximate shoreward edge of the gulf stream as of january 18 - .
18 nm south of dry tortugas light - .on loggerhead key. 16 nm south of cosgrove shoal light - .off the marquesas keys. 15 nm south of sand key light - .off key west. 13 nm south of looe key - .off big pine key. 13 nm southeast of sombrero key light - .off marathon. 12 nm southeast of alligator reef light - .off islamorada. 7 nm southeast of molasses reef light - .off key largo. 4 nm southeast 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 and rtofs.
7 Day Forecast for Marine Location Near Key Colony Beach, FL
NEW! Add second zone forecast
| Boot Key Harbor bridge Click for Map Mon -- 03:34 AM EST -0.31 feet Low Tide Mon -- 07:10 AM EST Sunrise Mon -- 07:52 AM EST Moonrise Mon -- 09:45 AM EST 1.02 feet High Tide Mon -- 02:45 PM EST 0.14 feet Low Tide Mon -- 06:00 PM EST Sunset Mon -- 06:56 PM EST Moonset Mon -- 09:09 PM EST 1.94 feet High Tide Tide / Current data from XTide NOT FOR NAVIGATION |
Boot Key Harbor bridge, Boot Key, Florida, Tide feet
| 12 am |
| 0.8 |
| 1 am |
| 0.3 |
| 2 am |
| -0.1 |
| 3 am |
| -0.3 |
| 4 am |
| -0.3 |
| 5 am |
| -0.1 |
| 6 am |
| 0.1 |
| 7 am |
| 0.5 |
| 8 am |
| 0.8 |
| 9 am |
| 1 |
| 10 am |
| 1 |
| 11 am |
| 0.9 |
| 12 pm |
| 0.6 |
| 1 pm |
| 0.4 |
| 2 pm |
| 0.2 |
| 3 pm |
| 0.1 |
| 4 pm |
| 0.3 |
| 5 pm |
| 0.6 |
| 6 pm |
| 1 |
| 7 pm |
| 1.4 |
| 8 pm |
| 1.8 |
| 9 pm |
| 1.9 |
| 10 pm |
| 1.9 |
| 11 pm |
| 1.6 |
| Moser Channel Click for Map Flood direction 346 true Ebb direction 164 true Mon -- 02:40 AM EST -2.23 knots Max Ebb Mon -- 06:30 AM EST 0.00 knots Slack Mon -- 07:10 AM EST Sunrise Mon -- 07:53 AM EST Moonrise Mon -- 09:50 AM EST 1.51 knots Max Flood Mon -- 12:50 PM EST -0.00 knots Slack Mon -- 03:29 PM EST -1.40 knots Max Ebb Mon -- 06:00 PM EST Sunset Mon -- 06:31 PM EST 0.00 knots Slack Mon -- 06:56 PM EST Moonset Mon -- 09:09 PM EST 1.34 knots Max Flood Tide / Current data from XTide NOT FOR NAVIGATION |
Moser Channel, between Molasses and Pigeon Keys (depth 3 ft), Florida Current, knots
| 12 am |
| -0.6 |
| 1 am |
| -1.5 |
| 2 am |
| -2.1 |
| 3 am |
| -2.2 |
| 4 am |
| -1.9 |
| 5 am |
| -1.3 |
| 6 am |
| -0.5 |
| 7 am |
| 0.4 |
| 8 am |
| 1.1 |
| 9 am |
| 1.4 |
| 10 am |
| 1.5 |
| 11 am |
| 1.3 |
| 12 pm |
| 0.7 |
| 1 pm |
| -0.1 |
| 2 pm |
| -0.9 |
| 3 pm |
| -1.4 |
| 4 pm |
| -1.4 |
| 5 pm |
| -1 |
| 6 pm |
| -0.4 |
| 7 pm |
| 0.4 |
| 8 pm |
| 1.1 |
| 9 pm |
| 1.3 |
| 10 pm |
| 1.2 |
| 11 pm |
| 0.8 |
FXUS62 KKEY 200333 AFDKEY
Area Forecast Discussion National Weather Service Key West FL 1033 PM EST Mon Jan 19 2026
New DISCUSSION, MARINE, AVIATION
KEY MESSAGES
-Cooler and drier conditions will continue over the next couple of days, with warmer temperatures expected for the end of the week and the weekend.
-Bouts of breezy to windy conditions will continue through Wednesday night.
-Dry conditions expected tonight thorugh Wednesday, with increasing rain chances for Wednesday night and Thursday.
DISCUSSION
Issued at 1030 PM EST Mon Jan 19 2026 The 00z evening sounding at KEY sampled a dry-adiabatically, well-mixed layer from the surface up to around the 925 isobaric surface. The layer characterized by constant potential temperature is then capped by a thermodynamically-stable layer just above, albeit saturated. GOES-19 nighttime microphysics imagery supports this saturdated layer between 925-830 mb, with a relatively thick stratus deck advecting westward towards the Keys over the past several hours. Owed to nocturnal trapping of outgoing longwave radiation, temperatures have actually risen a few degrees since this evening, with available land-based surface observations indicating temperatures in the lower 60s at this hour.
Tonight will be characterized by generally mostly cloudy skies and nil rain chances. Temperatures will likely drop only a few degrees overnight in the Middle and Upper Keys, mainly toward sunrise. In the Upper Keys, the drop will be more noticeable owed to drainage from the South Florida Mainland in the mean fresh to strong northerlies. No changes proposed for this late evening update cycle.
MARINE
Issued at 1030 PM EST Mon Jan 19 2026 A Small Craft Advisory remains in effect for all Florida Keys marine zones. From synopsis, an expansive high pressure system will move across the eastern United States over the next several days, leading to a strengthening pressure gradient. This will continue to promote bouts of fresh to strong breezes throughout the work week. The high will move out into the western North Atlantic mid- late week while weakening. This will support slackening breezes for Friday night and Saturday.
AVIATION
(00Z TAFS)
Issued at 1030 PM EST Mon Jan 19 2026 Bouts of MVFR CIGs will occur in the vicinity of both terminals through at least 12z Tuesday morning. Despite the bouts of MVFR CIGs , confidence is high in nil rain chances at the terminals.
Clearing conditions, with VFR conditions, are then expected through the end of the TAF period. Near-surface winds will remain out of the north to northeast, slowly veering to the northeast.
Winds will occasionally gust to near 25 knots overnight, with frequent gusts to near 20 knots continuing on Tuesday.
PRELIMINARY POINT TEMPS/POPS
Key West 59 72 65 76 / 0 0 0 10 Marathon 59 71 65 77 / 0 0 0 10
KEY WATCHES/WARNINGS/ADVISORIES
FL...None.
GM...Small Craft Advisory until 11 AM EST Tuesday for GMZ031>035- 042>044-052>055-072>075.
Area Forecast Discussion National Weather Service Key West FL 1033 PM EST Mon Jan 19 2026
New DISCUSSION, MARINE, AVIATION
KEY MESSAGES
-Cooler and drier conditions will continue over the next couple of days, with warmer temperatures expected for the end of the week and the weekend.
-Bouts of breezy to windy conditions will continue through Wednesday night.
-Dry conditions expected tonight thorugh Wednesday, with increasing rain chances for Wednesday night and Thursday.
DISCUSSION
Issued at 1030 PM EST Mon Jan 19 2026 The 00z evening sounding at KEY sampled a dry-adiabatically, well-mixed layer from the surface up to around the 925 isobaric surface. The layer characterized by constant potential temperature is then capped by a thermodynamically-stable layer just above, albeit saturated. GOES-19 nighttime microphysics imagery supports this saturdated layer between 925-830 mb, with a relatively thick stratus deck advecting westward towards the Keys over the past several hours. Owed to nocturnal trapping of outgoing longwave radiation, temperatures have actually risen a few degrees since this evening, with available land-based surface observations indicating temperatures in the lower 60s at this hour.
Tonight will be characterized by generally mostly cloudy skies and nil rain chances. Temperatures will likely drop only a few degrees overnight in the Middle and Upper Keys, mainly toward sunrise. In the Upper Keys, the drop will be more noticeable owed to drainage from the South Florida Mainland in the mean fresh to strong northerlies. No changes proposed for this late evening update cycle.
MARINE
Issued at 1030 PM EST Mon Jan 19 2026 A Small Craft Advisory remains in effect for all Florida Keys marine zones. From synopsis, an expansive high pressure system will move across the eastern United States over the next several days, leading to a strengthening pressure gradient. This will continue to promote bouts of fresh to strong breezes throughout the work week. The high will move out into the western North Atlantic mid- late week while weakening. This will support slackening breezes for Friday night and Saturday.
AVIATION
(00Z TAFS)
Issued at 1030 PM EST Mon Jan 19 2026 Bouts of MVFR CIGs will occur in the vicinity of both terminals through at least 12z Tuesday morning. Despite the bouts of MVFR CIGs , confidence is high in nil rain chances at the terminals.
Clearing conditions, with VFR conditions, are then expected through the end of the TAF period. Near-surface winds will remain out of the north to northeast, slowly veering to the northeast.
Winds will occasionally gust to near 25 knots overnight, with frequent gusts to near 20 knots continuing on Tuesday.
PRELIMINARY POINT TEMPS/POPS
Key West 59 72 65 76 / 0 0 0 10 Marathon 59 71 65 77 / 0 0 0 10
KEY WATCHES/WARNINGS/ADVISORIES
FL...None.
GM...Small Craft Advisory until 11 AM EST Tuesday for GMZ031>035- 042>044-052>055-072>075.
Wind History for Vaca Key, FL
toggle option: (graph/table)
Link to 1 hour of 5 minute data for KMTH
Terminal Aerodrome Forecast (TAF) for KMTH
Wind History Graph: MTH
(wind in knots)
GEOS Local Image of Southeast
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Key West, FL,
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