Marine Weather and Tide Forecast for Stock Island, FL
 | Sunrise 6:59 AM Sunset 7:51 PM Moonrise 9:25 AM Moonset 11:53 PM |
Marine Forecasts
NOTE: Zones updated 4/16/2026. Some zones changed. Use Edit if needed.
GMZ044 Expires:202604211415;;720953 Fzus52 Kkey 210213 Cwfkey
coastal waters forecast for the florida keys national weather service key west fl 1013 pm edt Mon apr 20 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.
gmz042>044-211415- 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- 1013 pm edt Mon apr 20 2026
.small craft advisory in effect - .
Overnight - Northeast winds 15 to 20 knots, increasing to 20 to 25 knots. Seas 2 to 4 feet, occasionally to 5 feet. West of cosgrove shoal light, seas 2 to 4 feet, occasionally to 5 feet, building to 4 to 5 feet, occasionally to 6 feet. NEarshore waters choppy, becoming very rough. A chance of showers with a slight chance of Thunderstorms.
Tuesday - Northeast to east winds near 25 knots. Seas 4 to 6 feet, occasionally to 8 feet, except 5 to 7 feet, occasionally to 9 feet west of cosgrove shoal light. NEarshore waters extremely rough. A chance of showers.
Tuesday night - Northeast to east winds near 25 knots, decreasing to 20 to 25 knots. Seas 4 to 6 feet, occasionally to 8 feet. NEarshore waters extremely rough, becoming very rough.
Wednesday - East winds near 20 knots, decreasing to 15 to 20 knots. Seas 3 to 5 feet, occasionally to 6 feet. NEarshore waters rough, becoming choppy.
Wednesday night - East winds 15 to 20 knots. Seas 3 to 4 feet, occasionally to 5 feet. NEarshore waters choppy. A slight chance of showers.
Thursday - East winds 15 to 20 knots. Seas 2 to 4 feet, occasionally to 5 feet. NEarshore waters choppy. A slight chance of showers.
Thursday night - East winds 15 to 20 knots. Seas 2 to 4 feet, occasionally to 5 feet. NEarshore waters choppy. A slight chance of showers and Thunderstorms.
Friday - East to southeast winds near 15 knots, decreasing to 10 to 15 knots. Seas 2 to 3 feet. NEarshore waters a moderate chop, becoming a light to moderate chop. A slight chance of showers.
Friday night - East winds 10 to 15 knots. Seas 2 to 3 feet. NEarshore waters a light to moderate chop. A slight chance of showers.
Saturday and Saturday night - East to southeast winds near 10 knots. Seas 1 to 2 feet. NEarshore waters smooth to a light chop.
coastal waters forecast for the florida keys national weather service key west fl 1013 pm edt Mon apr 20 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.
gmz042>044-211415- 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- 1013 pm edt Mon apr 20 2026
GMZ005 Synopsis For Keys Coastal Waters From Ocean Reef To Dry Tortugas 1013 Pm Edt Mon Apr 20 2026
Synopsis - Breezes will freshen overnight due to an approaching frontal boundary. High pressure will build across the eastern seaboard in its wake, slowly migrating into the western north atlantic over the next several days. Hazardous marine conditions are expected to continue through at least Wednesday. As the high slowly weakens, breezes will begin to slacken by Thursday. Gentle to moderate breezes are expected for Friday and Saturday.
the approximate shoreward edge of the gulf stream as of april 16 - .
16 nm south of dry tortugas light - .on loggerhead key. 12 nm south of cosgrove shoal light - .off the marquesas keys. 22 nm south of sand key light - .off key west. 30 nm south of looe key - .off big pine key. 26 nm southeast of sombrero key light - .off marathon. 20 nm southeast of alligator reef light - .off islamorada. 15 nm southeast of molasses reef light - .off key largo. 9 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 april 16 - .
16 nm south of dry tortugas light - .on loggerhead key. 12 nm south of cosgrove shoal light - .off the marquesas keys. 22 nm south of sand key light - .off key west. 30 nm south of looe key - .off big pine key. 26 nm southeast of sombrero key light - .off marathon. 20 nm southeast of alligator reef light - .off islamorada. 15 nm southeast of molasses reef light - .off key largo. 9 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 Stock Island, FL
NEW! Add second zone forecast
| Cow Key Channel Click for Map Tue -- 04:05 AM EDT 0.59 feet High Tide Tue -- 06:59 AM EDT Sunrise Tue -- 08:17 AM EDT 0.29 feet Low Tide Tue -- 10:25 AM EDT Moonrise Tue -- 03:04 PM EDT 1.26 feet High Tide Tue -- 07:51 PM EDT Sunset Tue -- 10:16 PM EDT -0.28 feet Low Tide Tide / Current data from XTide NOT FOR NAVIGATION |
Cow Key Channel, Florida, Tide feet
| 12 am |
| -0 |
| 1 am |
| 0.2 |
| 2 am |
| 0.4 |
| 3 am |
| 0.5 |
| 4 am |
| 0.6 |
| 5 am |
| 0.6 |
| 6 am |
| 0.5 |
| 7 am |
| 0.4 |
| 8 am |
| 0.3 |
| 9 am |
| 0.3 |
| 10 am |
| 0.4 |
| 11 am |
| 0.6 |
| 12 pm |
| 0.9 |
| 1 pm |
| 1.1 |
| 2 pm |
| 1.2 |
| 3 pm |
| 1.3 |
| 4 pm |
| 1.2 |
| 5 pm |
| 1 |
| 6 pm |
| 0.7 |
| 7 pm |
| 0.4 |
| 8 pm |
| 0.1 |
| 9 pm |
| -0.2 |
| 10 pm |
| -0.3 |
| 11 pm |
| -0.2 |
| Fleming Key Cut (depth 4 ft) Click for Map Flood direction 68 true Ebb direction 279 true Tue -- 12:56 AM EDT 0.60 knots Max Flood Tue -- 02:53 AM EDT -0.00 knots Slack Tue -- 05:38 AM EDT -1.25 knots Max Ebb Tue -- 06:59 AM EDT Sunrise Tue -- 08:46 AM EDT 0.00 knots Slack Tue -- 10:25 AM EDT Moonrise Tue -- 10:47 AM EDT 0.77 knots Max Flood Tue -- 01:37 PM EDT -0.00 knots Slack Tue -- 05:52 PM EDT -2.59 knots Max Ebb Tue -- 07:52 PM EDT Sunset Tue -- 10:43 PM EDT 0.00 knots Slack Tide / Current data from XTide NOT FOR NAVIGATION |
Fleming Key Cut (depth 4 ft), Florida Current, knots
| 12 am |
| 0.5 |
| 1 am |
| 0.6 |
| 2 am |
| 0.4 |
| 3 am |
| -0.1 |
| 4 am |
| -0.7 |
| 5 am |
| -1.2 |
| 6 am |
| -1.2 |
| 7 am |
| -0.9 |
| 8 am |
| -0.4 |
| 9 am |
| 0.1 |
| 10 am |
| 0.6 |
| 11 am |
| 0.8 |
| 12 pm |
| 0.6 |
| 1 pm |
| 0.2 |
| 2 pm |
| -0.2 |
| 3 pm |
| -0.9 |
| 4 pm |
| -1.7 |
| 5 pm |
| -2.4 |
| 6 pm |
| -2.6 |
| 7 pm |
| -2.3 |
| 8 pm |
| -1.8 |
| 9 pm |
| -1.1 |
| 10 pm |
| -0.4 |
| 11 pm |
| 0.1 |
FXUS62 KKEY 210138 AFDKEY
Area Forecast Discussion National Weather Service Key West FL 938 PM EDT Mon Apr 20 2026
New DISCUSSION, MARINE, AVIATION
KEY MESSAGES
- A late-season cold front will move through the Florida Keys overnight, supporting an elevated chance of showers and a slight chance of thunderstorms.
- Fresh to strong breezes are expected in the wake of the front. A Small Craft Advisory is effect for all Keys coastal waters.
- There is low confidence in the rain and thunder chances for Thursday and Friday.
DISCUSSION
Issued at 930 PM EDT Mon Apr 20 2026 CIMSS MIMIC total precipitable water product highlights a tight moisture gradient associated with a frontal boundary slowly nudging southward towards the Florida Keys at this late evening hour. The 00z evening sounding at KEY highlighted generally stable low levels, a chaotic wind field, and a relatively dry boundary layer. With that said, deeper moisture over the South Florida Mainland is progressing southwestwards. Portions of the Upper Keys received quite a bit of rainfall this evening, with radar- estimated totals approaching 3-4" in select island communities between North Key Largo and Ocean Reef. Meanwhile, the Lower and Middle Keys have remained dry thus far tonight.
Overnight, the aforementioned frontal boundary will continue to slowly progress southward. Nearly all available Convective Allowing Model (CAM) guidance supports additional showers being triggered in portions of the Upper Keys between 03-06z, with the associated outflow zippering additional showers across most of the Island Chain. This seems plausible, albeit probably a bit overdone in terms of coverage and intensity. As is often the case this time of year, decreasing baroclinicity this far south has slowed the momentum of the front. Due to this, did elect to nudge rain chances upward for the first part of Tuesday as the front likely lingers in the vicinity of portions of the Keys. Other than that adjustment, no changes proposed for this late evening update cycle.
MARINE
Issued at 930 PM EDT Mon Apr 20 2026 A Small Craft Advisory is in effect for all Florida Keys marine zones. From synopsis, breezes will freshen overnight due to an approaching frontal boundary. High pressure will build across the Eastern Seaboard in its wake, slowly migrating into the western North Atlantic over the next several days. Hazardous marine conditions are expected to continue through at least Wednesday. As the high slowly weakens, breezes will begin to slacken by Thursday. Gentle to moderate breezes are expected for Friday and Saturday.
AVIATION
(00Z TAFS)
Issued at 930 PM EDT Mon Apr 20 2026 A frontal boundary will push towards the Keys overnight, supporting winds clocking around to the northeast, along with frequent gusts 20 to 25 knots after 06z this evening. Showers with isolated thunder will be possible, although confidence in timing and coverage is too low to support anything beyond a window of VCSH for now. This will be reevaluated for the 06z overnight TAF issuance.
PRELIMINARY POINT TEMPS/POPS
Key West 72 81 72 81 / 30 30 0 10 Marathon 72 79 72 79 / 30 30 0 0
KEY WATCHES/WARNINGS/ADVISORIES
FL...None.
GM...Small Craft Advisory until 6 AM EDT Wednesday for GMZ031>035- 042>044-052>055-072>075.
Area Forecast Discussion National Weather Service Key West FL 938 PM EDT Mon Apr 20 2026
New DISCUSSION, MARINE, AVIATION
KEY MESSAGES
- A late-season cold front will move through the Florida Keys overnight, supporting an elevated chance of showers and a slight chance of thunderstorms.
- Fresh to strong breezes are expected in the wake of the front. A Small Craft Advisory is effect for all Keys coastal waters.
- There is low confidence in the rain and thunder chances for Thursday and Friday.
DISCUSSION
Issued at 930 PM EDT Mon Apr 20 2026 CIMSS MIMIC total precipitable water product highlights a tight moisture gradient associated with a frontal boundary slowly nudging southward towards the Florida Keys at this late evening hour. The 00z evening sounding at KEY highlighted generally stable low levels, a chaotic wind field, and a relatively dry boundary layer. With that said, deeper moisture over the South Florida Mainland is progressing southwestwards. Portions of the Upper Keys received quite a bit of rainfall this evening, with radar- estimated totals approaching 3-4" in select island communities between North Key Largo and Ocean Reef. Meanwhile, the Lower and Middle Keys have remained dry thus far tonight.
Overnight, the aforementioned frontal boundary will continue to slowly progress southward. Nearly all available Convective Allowing Model (CAM) guidance supports additional showers being triggered in portions of the Upper Keys between 03-06z, with the associated outflow zippering additional showers across most of the Island Chain. This seems plausible, albeit probably a bit overdone in terms of coverage and intensity. As is often the case this time of year, decreasing baroclinicity this far south has slowed the momentum of the front. Due to this, did elect to nudge rain chances upward for the first part of Tuesday as the front likely lingers in the vicinity of portions of the Keys. Other than that adjustment, no changes proposed for this late evening update cycle.
MARINE
Issued at 930 PM EDT Mon Apr 20 2026 A Small Craft Advisory is in effect for all Florida Keys marine zones. From synopsis, breezes will freshen overnight due to an approaching frontal boundary. High pressure will build across the Eastern Seaboard in its wake, slowly migrating into the western North Atlantic over the next several days. Hazardous marine conditions are expected to continue through at least Wednesday. As the high slowly weakens, breezes will begin to slacken by Thursday. Gentle to moderate breezes are expected for Friday and Saturday.
AVIATION
(00Z TAFS)
Issued at 930 PM EDT Mon Apr 20 2026 A frontal boundary will push towards the Keys overnight, supporting winds clocking around to the northeast, along with frequent gusts 20 to 25 knots after 06z this evening. Showers with isolated thunder will be possible, although confidence in timing and coverage is too low to support anything beyond a window of VCSH for now. This will be reevaluated for the 06z overnight TAF issuance.
PRELIMINARY POINT TEMPS/POPS
Key West 72 81 72 81 / 30 30 0 10 Marathon 72 79 72 79 / 30 30 0 0
KEY WATCHES/WARNINGS/ADVISORIES
FL...None.
GM...Small Craft Advisory until 6 AM EDT Wednesday for GMZ031>035- 042>044-052>055-072>075.
| Stations | Dist | Age | Wind | Air | Water | Waves | inHg | DewPt |
| KYWF1 - 8724580 - Key West, FL | 3 mi | 73 min | E 12G | 76°F | ||||
| SANF1 - Sand Key, FL | 10 mi | 53 min | ENE 21G | 76°F | 30.06 | 71°F | ||
| 42095 | 16 mi | 73 min | 77°F | 79°F | 3 ft | |||
| SMKF1 - Sombrero Key, FL | 34 mi | 53 min | ENE 19G | 78°F | 30.05 | 73°F | ||
| VCAF1 - 8723970 - Vaca Key, FL | 35 mi | 73 min | ENE 13G | 78°F | 81°F | 30.06 |
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 gulf of mexico
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Key West, FL,
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