Marine Weather and Tide Forecast for Duck Key, FL
 | Sunrise 6:38 AM Sunset 5:43 PM Moonrise 5:58 AM Moonset 5:04 PM |
Marine Forecasts
NOTE: Zones updated 4/16/2026. Some zones changed. Use Edit if needed.
GMZ043 Expires:202611082130;;465442 Fzus52 Kkey 080927 Cwfkey
coastal waters forecast for the florida keys national weather service key west fl 427 am est Sun nov 8 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.
gmz042>044-082130- 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- 427 am est Sun nov 8 2026
Today - Northeast winds 5 to 10 knots. Seas 1 to 2 feet. NEarshore waters smooth to a light chop. A slight chance of showers.
Tonight - Northeast to east winds 5 to 10 knots. Seas 1 to 2 feet. NEarshore waters smooth to a light chop. A slight chance of showers.
Monday - Northeast to east winds 5 to 10 knots. Seas 1 to 2 feet. NEarshore waters smooth to a light chop. A slight chance of showers.
Monday night - Northeast to east winds near 10 knots, increasing to near 15 knots. Seas around 2 feet, building to 2 to 3 feet. NEarshore waters a light chop, becoming a moderate chop. A slight chance of showers.
Tuesday - Northeast to east winds 10 to 15 knots. Seas around 2 feet. NEarshore waters a light to moderate chop. A slight chance of showers.
Tuesday night - East winds near 10 knots. Seas 1 to 2 feet. NEarshore waters a light chop.
Wednesday - East winds 5 to 10 knots, decreasing to near 5 knots. Seas subsiding to around 1 foot. NEarshore waters smooth to a light chop, becoming smooth. A slight chance of showers.
Wednesday night - East winds near 5 knots, becoming south. Seas around 1 foot. NEarshore waters smooth. A slight chance of showers.
Thursday - Southwest to west winds 5 to 10 knots. Seas around 1 foot. NEarshore waters smooth to a light chop. A slight chance of showers.
Thursday night - West winds near 10 knots, increasing to near 15 knots late. Seas around 1 foot. NEarshore waters a light chop, becoming a moderate chop. A chance of showers with a slight chance of Thunderstorms.
coastal waters forecast for the florida keys national weather service key west fl 427 am est Sun nov 8 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.
gmz042>044-082130- 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- 427 am est Sun nov 8 2026
GMZ005 Synopsis For Keys Coastal Waters From Ocean Reef To Dry Tortugas 427 Am Est Sun Nov 8 2026
Synopsis - A robust high pressure system over the southeastern united states will spread eastward over the next few days. As a result, light to gentle northeasterly breezes will gradually shift further northeasterly and strengthen modestly early this. As the high slides further southeastward into the west-central north atlantic, breezes will clock around to the east and modestly slacken by mid week. A strong cold front may push through the keys marine zones on Thursday night, with winds backing to the northwest and freshening in its wake.
the approximate shoreward edge of the gulf stream as of november 03, 2026 - .
57 nm south of dry tortugas light, on loggerhead key 34 nm south of cosgrove shoal light, off the marquesas keys 25 nm south of sand key light, off key west 17 nm south of looe key, off big pine key 17 nm southeast of sombrero key light, off marathon 28 nm south-southeast of alligator reef light, off islamorada 26 nm southeast of molasses reef light, off key largo 12 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.
the approximate shoreward edge of the gulf stream as of november 03, 2026 - .
57 nm south of dry tortugas light, on loggerhead key 34 nm south of cosgrove shoal light, off the marquesas keys 25 nm south of sand key light, off key west 17 nm south of looe key, off big pine key 17 nm southeast of sombrero key light, off marathon 28 nm south-southeast of alligator reef light, off islamorada 26 nm southeast of molasses reef light, off key largo 12 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.
7 Day Forecast for Marine Location Near Duck Key, FL
NEW! Add second zone forecast
| Conch Key Click for Map Sun -- 02:03 AM EST 0.04 feet Low Tide Sun -- 05:58 AM EST Moonrise Sun -- 06:35 AM EST Sunrise Sun -- 08:26 AM EST 1.41 feet High Tide Sun -- 01:30 PM EST 0.44 feet Low Tide Sun -- 05:04 PM EST Moonset Sun -- 05:39 PM EST Sunset Sun -- 07:34 PM EST 1.95 feet High Tide Tide / Current data from XTide NOT FOR NAVIGATION |
Conch Key, eastern end, Florida, Tide feet
| 12 am |
| 0.4 |
| 1 am |
| 0.1 |
| 2 am |
| 0 |
| 3 am |
| 0.1 |
| 4 am |
| 0.4 |
| 5 am |
| 0.7 |
| 6 am |
| 1 |
| 7 am |
| 1.2 |
| 8 am |
| 1.4 |
| 9 am |
| 1.4 |
| 10 am |
| 1.2 |
| 11 am |
| 0.9 |
| 12 pm |
| 0.6 |
| 1 pm |
| 0.5 |
| 2 pm |
| 0.5 |
| 3 pm |
| 0.7 |
| 4 pm |
| 1 |
| 5 pm |
| 1.4 |
| 6 pm |
| 1.7 |
| 7 pm |
| 1.9 |
| 8 pm |
| 1.9 |
| 9 pm |
| 1.8 |
| 10 pm |
| 1.5 |
| 11 pm |
| 1.1 |
| Long Key Viaduct Click for Map Flood direction 349 true Ebb direction 170 true Sun -- 01:49 AM EST -1.46 knots Max Ebb Sun -- 05:02 AM EST 0.00 knots Slack Sun -- 05:58 AM EST Moonrise Sun -- 06:35 AM EST Sunrise Sun -- 08:27 AM EST 1.12 knots Max Flood Sun -- 11:49 AM EST -0.00 knots Slack Sun -- 02:27 PM EST -1.22 knots Max Ebb Sun -- 05:04 PM EST Moonset Sun -- 05:18 PM EST 0.00 knots Slack Sun -- 05:39 PM EST Sunset Sun -- 07:58 PM EST 0.93 knots Max Flood Sun -- 11:21 PM EST -0.00 knots Slack Tide / Current data from XTide NOT FOR NAVIGATION |
Long Key Viaduct, Florida Current, knots
| 12 am |
| -0.8 |
| 1 am |
| -1.3 |
| 2 am |
| -1.5 |
| 3 am |
| -1.3 |
| 4 am |
| -0.7 |
| 5 am |
| -0 |
| 6 am |
| 0.6 |
| 7 am |
| 1 |
| 8 am |
| 1.1 |
| 9 am |
| 1.1 |
| 10 am |
| 0.9 |
| 11 am |
| 0.5 |
| 12 pm |
| -0.1 |
| 1 pm |
| -0.8 |
| 2 pm |
| -1.2 |
| 3 pm |
| -1.2 |
| 4 pm |
| -0.8 |
| 5 pm |
| -0.2 |
| 6 pm |
| 0.4 |
| 7 pm |
| 0.8 |
| 8 pm |
| 0.9 |
| 9 pm |
| 0.9 |
| 10 pm |
| 0.6 |
| 11 pm |
| 0.2 |
FXUS62 KKEY 080902 AFDKEY
Area Forecast Discussion National Weather Service Key West FL 402 AM EST Sun Nov 8 2026
New DISCUSSION, MARINE, AVIATION
KEY MESSAGES
- Minor coastal flooding will continue across the Keys around high tide. Moderate coastal flooding will also be possible through early next week, especially in the Upper Keys.
- Rain chances will be at or below normal through the weekend, with dewpoints remaining in the lower 70s.
- The first strong cold front of the season may push through the Keys late next week, with much cooler sweater weather possible in its wake.
DISCUSSION
Issued at 400 AM EST Sun Nov 8 2026
A surface ridge aligned over the southeastern United States and adjacent Atlantic is responsible for light to gentle north to northeasterly breezes across the region this morning. The steady flow on warm waters is slowing nocturnal cooling and temperatures remain in the upper 70s. Dew points remain in a more comfortable range in the lower 70s. A weak lower level ridge is just about overhead with nearly zonal flow in the mid and upper levels. Last evenings sounding indicated precipitable water near the 25th percentile for the date, no low level CAPE and some inhibition.
These factors have kept the Keys clear of shower activity through the evening. However, a swath of enhanced lower level moisture is being carried southward around the periphery of the lower level ridge. There is enough lower level lift along this moisture axis to support a couple of broken band of moderate showers on South Florida's Atlantic waters. Recent satellite imagery does a good job of locating the lower level moisture band and depicting modest isentropic lift.
No significant shift is expected in our synoptic scale setup. A surface ridge will remain aligned over the southeast, with weak lower level ridging overhead, and nearly zonal flow aloft. The previously mentioned moisture axis and some low level veering may support a few showers along the island chain, primarily in the Upper Keys. In addition, the steering flow will likely line up parallel with island chain for portions of the day. While low level CAPE will remain limited, so will inhibition. All this along with the modest boost in lower level moisture may support island cloud lines and a stray shower or two. As a result, maintaining slight chance of showers remains justified for today. Expect continued warm conditions with highs in the mid 80s. Dew points will remain comfortable in the lower 70s.
MARINE
Issued at 400 AM EST Sun Nov 8 2026
A surface ridge blanketing the southeastern United States will maintain light to gentle northeasterly breezes today. Mainland day time heating will back winds northerly on our deep gulf waters this afternoon.
AVIATION
(06Z TAFS)
Issued at 400 AM EST Sun Nov 8 2026
VFR conditions will prevail at the island terminals today. Surface winds will be light to gentle out of the north to northeast.
KEY WATCHES/WARNINGS/ADVISORIES
FL...None.
GM...None.
Area Forecast Discussion National Weather Service Key West FL 402 AM EST Sun Nov 8 2026
New DISCUSSION, MARINE, AVIATION
KEY MESSAGES
- Minor coastal flooding will continue across the Keys around high tide. Moderate coastal flooding will also be possible through early next week, especially in the Upper Keys.
- Rain chances will be at or below normal through the weekend, with dewpoints remaining in the lower 70s.
- The first strong cold front of the season may push through the Keys late next week, with much cooler sweater weather possible in its wake.
DISCUSSION
Issued at 400 AM EST Sun Nov 8 2026
A surface ridge aligned over the southeastern United States and adjacent Atlantic is responsible for light to gentle north to northeasterly breezes across the region this morning. The steady flow on warm waters is slowing nocturnal cooling and temperatures remain in the upper 70s. Dew points remain in a more comfortable range in the lower 70s. A weak lower level ridge is just about overhead with nearly zonal flow in the mid and upper levels. Last evenings sounding indicated precipitable water near the 25th percentile for the date, no low level CAPE and some inhibition.
These factors have kept the Keys clear of shower activity through the evening. However, a swath of enhanced lower level moisture is being carried southward around the periphery of the lower level ridge. There is enough lower level lift along this moisture axis to support a couple of broken band of moderate showers on South Florida's Atlantic waters. Recent satellite imagery does a good job of locating the lower level moisture band and depicting modest isentropic lift.
No significant shift is expected in our synoptic scale setup. A surface ridge will remain aligned over the southeast, with weak lower level ridging overhead, and nearly zonal flow aloft. The previously mentioned moisture axis and some low level veering may support a few showers along the island chain, primarily in the Upper Keys. In addition, the steering flow will likely line up parallel with island chain for portions of the day. While low level CAPE will remain limited, so will inhibition. All this along with the modest boost in lower level moisture may support island cloud lines and a stray shower or two. As a result, maintaining slight chance of showers remains justified for today. Expect continued warm conditions with highs in the mid 80s. Dew points will remain comfortable in the lower 70s.
MARINE
Issued at 400 AM EST Sun Nov 8 2026
A surface ridge blanketing the southeastern United States will maintain light to gentle northeasterly breezes today. Mainland day time heating will back winds northerly on our deep gulf waters this afternoon.
AVIATION
(06Z TAFS)
Issued at 400 AM EST Sun Nov 8 2026
VFR conditions will prevail at the island terminals today. Surface winds will be light to gentle out of the north to northeast.
KEY WATCHES/WARNINGS/ADVISORIES
FL...None.
GM...None.
Wind History for Vaca Key, FL
toggle option: (graph/table)
Link to 5 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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