Marine Weather and Tide Forecast for Marathon, FL
 | Sunrise 6:37 AM Sunset 8:19 PM Moonrise 1:17 AM Moonset 2:23 PM |
GMZ053 Expires:202506201430;;042147 Fzus52 Kkey 200221 Cwfkey
coastal waters forecast for the florida keys national weather service key west fl 1021 pm edt Thu jun 19 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>075-201430- 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- 1021 pm edt Thu jun 19 2025
Overnight - East winds 10 to 15 knots. Seas 2 to 3 feet. Wave detail: east 3 feet at 5 seconds. Isolated showers and Thunderstorms.
Friday - East winds near 10 knots. Seas 2 to 3 feet. Wave detail: east to southeast 2 feet at 4 seconds. Scattered showers and isolated Thunderstorms.
Friday night - East winds 10 to 15 knots. Seas 2 to 3 feet. Scattered showers and isolated Thunderstorms.
Saturday - East winds 10 to 15 knots. Seas 2 to 3 feet. Scattered showers and isolated Thunderstorms.
Saturday night - East winds 10 to 15 knots. Seas 2 to 3 feet. Scattered showers and isolated Thunderstorms.
Sunday - East winds 10 to 15 knots, increasing to near 15 knots. Seas building to 2 to 4 feet. Scattered showers and isolated Thunderstorms.
Sunday night - East winds near 15 knots. Seas 3 to 4 feet, occasionally to 5 feet. Scattered showers and isolated Thunderstorms.
Monday and Monday night - East winds near 15 knots. Seas 3 to 4 feet, occasionally to 5 feet. Scattered showers and isolated Thunderstorms.
Tuesday - East winds near 15 knots. Seas 3 to 5 feet, occasionally to 6 feet. Scattered showers and isolated Thunderstorms.
Tuesday night - East winds 10 to 15 knots. Seas 3 to 5 feet, occasionally to 6 feet. Scattered showers and isolated Thunderstorms.
coastal waters forecast for the florida keys national weather service key west fl 1021 pm edt Thu jun 19 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>075-201430- 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- 1021 pm edt Thu jun 19 2025
GMZ005 Synopsis For Keys Coastal Waters From Ocean Reef To Dry Tortugas 1021 Pm Edt Thu Jun 19 2025
Synopsis - Atlantic ridging across the florida peninsula will weaken over the next couple of days resulting in relaxing breezes. The atlantic ridging will consolidate off the southeast coast over the weekend and early next week returning moderate and periodically fresh breezes.
the approximate shoreward edge of the gulf stream as of june 13 - .
18 nm southwest of dry tortugas light - .on loggerhead key. 36 nm south of cosgrove shoal light - .off the marquesas keys. 33 nm south of sand key light - .off key west. 39 nm south of looe key - .off big pine key. 25 nm south of sombrero key light - .off marathon. 11 nm southeast of alligator reef light - .off islamorada. 5 nm southeast of molasses reef light - .off key largo. 5 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 june 13 - .
18 nm southwest of dry tortugas light - .on loggerhead key. 36 nm south of cosgrove shoal light - .off the marquesas keys. 33 nm south of sand key light - .off key west. 39 nm south of looe key - .off big pine key. 25 nm south of sombrero key light - .off marathon. 11 nm southeast of alligator reef light - .off islamorada. 5 nm southeast of molasses reef light - .off key largo. 5 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 Marathon, FL
NEW! Add second zone forecast
| Vaca Key-Fat Deer Key bridge Click for Map Thu -- 01:41 AM EDT Moonrise Thu -- 03:37 AM EDT 1.42 feet High Tide Thu -- 06:35 AM EDT Sunrise Thu -- 10:28 AM EDT 0.19 feet Low Tide Thu -- 02:20 PM EDT Moonset Thu -- 04:11 PM EDT 1.10 feet High Tide Thu -- 08:15 PM EDT Sunset Thu -- 10:12 PM EDT 0.25 feet Low Tide Tide / Current data from XTide NOT FOR NAVIGATION |
Vaca Key-Fat Deer Key bridge, Florida, Tide feet
| 12 am |
| 0.7 |
| 1 am |
| 1 |
| 2 am |
| 1.2 |
| 3 am |
| 1.4 |
| 4 am |
| 1.4 |
| 5 am |
| 1.3 |
| 6 am |
| 1.1 |
| 7 am |
| 0.8 |
| 8 am |
| 0.6 |
| 9 am |
| 0.3 |
| 10 am |
| 0.2 |
| 11 am |
| 0.2 |
| 12 pm |
| 0.4 |
| 1 pm |
| 0.6 |
| 2 pm |
| 0.8 |
| 3 pm |
| 1 |
| 4 pm |
| 1.1 |
| 5 pm |
| 1.1 |
| 6 pm |
| 0.9 |
| 7 pm |
| 0.8 |
| 8 pm |
| 0.5 |
| 9 pm |
| 0.3 |
| 10 pm |
| 0.3 |
| 11 pm |
| 0.3 |
| Moser Channel (swingbridge) Click for Map Thu -- 01:07 AM EDT 0.00 knots Slack Thu -- 01:42 AM EDT Moonrise Thu -- 03:36 AM EDT 1.11 knots Max Flood Thu -- 06:36 AM EDT Sunrise Thu -- 06:41 AM EDT -0.00 knots Slack Thu -- 10:09 AM EDT -1.87 knots Max Ebb Thu -- 01:40 PM EDT 0.00 knots Slack Thu -- 02:20 PM EDT Moonset Thu -- 04:29 PM EDT 1.41 knots Max Flood Thu -- 07:55 PM EDT -0.00 knots Slack Thu -- 08:16 PM EDT Sunset Thu -- 10:56 PM EDT -1.50 knots Max Ebb Tide / Current data from XTide NOT FOR NAVIGATION |
Moser Channel (swingbridge), Florida Current, knots
| 12 am |
| -0.8 |
| 1 am |
| -0.1 |
| 2 am |
| 0.6 |
| 3 am |
| 1 |
| 4 am |
| 1.1 |
| 5 am |
| 0.8 |
| 6 am |
| 0.4 |
| 7 am |
| -0.2 |
| 8 am |
| -1 |
| 9 am |
| -1.6 |
| 10 am |
| -1.9 |
| 11 am |
| -1.7 |
| 12 pm |
| -1.3 |
| 1 pm |
| -0.6 |
| 2 pm |
| 0.3 |
| 3 pm |
| 1 |
| 4 pm |
| 1.4 |
| 5 pm |
| 1.4 |
| 6 pm |
| 1.1 |
| 7 pm |
| 0.7 |
| 8 pm |
| -0.1 |
| 9 pm |
| -0.8 |
| 10 pm |
| -1.3 |
| 11 pm |
| -1.5 |
FXUS62 KKEY 200251 AFDKEY
Area Forecast Discussion National Weather Service Key West FL 1051 PM EDT Thu Jun 19 2025
New UPDATE, MARINE, AVIATION
UPDATE
Issued at 1050 PM EDT Thu Jun 19 2025
An electrifying show tonight if were watching north of the island chain. A large cluster of showers and thunderstorms that developed across the southwest mainland, shifted southwest and moved into our waters. This cluster remains ongoing this hour and continues its southwest march across the outer Gulf waters. It has lost much of its bite but still remains quite the prolific lightning maker.
Outside of this activity, you would be none the wiser as conditions have remain tranquil all evening. Winds are east to southeast, helping to maintain temperatures as of 1050 pm, in the lower to mid 80s with dew points in the lower to mid 70s.
Minor changes were made to account for the said cluster marching through the outer Gulf waters. Otherwise, the rest of the area remains untouched. Expecting only a slight chance for precipitation for the overnight.
MARINE
Issued at 1050 PM EDT Thu Jun 19 2025
A cluster of thunderstorms is steadily marching southwest across the outer Gulf waters. There has been a slow and gradual downward trend in the strength and intensity over the past hour. Additional weakening is expected as it continues to move southwest. However, mariners should continue to exercise extreme caution as this activity is still capable of producing wind gusts near 30 knots, along with frequent lightning, and bouts of heavy rainfall.
From synopsis: Atlantic ridging across the Florida Peninsula will weaken over the next couple of days resulting in relaxing breezes.
The Atlantic ridging will consolidate off the southeast coast over the weekend and early next week returning moderate and periodically fresh breezes.
AVIATION
(00Z TAFS)
Issued at 1050 PM EDT Thu Jun 19 2025
VFR conditions will prevail across the island terminals tonight and into tomorrow morning. A slight chance still remains for isolated showers and thunderstorms to move across the airfields overnight but confidence on exact location and time remain uncertain. Therefore, they will be added in future amendments as needed.
KEY WATCHES/WARNINGS/ADVISORIES
FL...None.
GM...None.
Area Forecast Discussion National Weather Service Key West FL 1051 PM EDT Thu Jun 19 2025
New UPDATE, MARINE, AVIATION
UPDATE
Issued at 1050 PM EDT Thu Jun 19 2025
An electrifying show tonight if were watching north of the island chain. A large cluster of showers and thunderstorms that developed across the southwest mainland, shifted southwest and moved into our waters. This cluster remains ongoing this hour and continues its southwest march across the outer Gulf waters. It has lost much of its bite but still remains quite the prolific lightning maker.
Outside of this activity, you would be none the wiser as conditions have remain tranquil all evening. Winds are east to southeast, helping to maintain temperatures as of 1050 pm, in the lower to mid 80s with dew points in the lower to mid 70s.
Minor changes were made to account for the said cluster marching through the outer Gulf waters. Otherwise, the rest of the area remains untouched. Expecting only a slight chance for precipitation for the overnight.
MARINE
Issued at 1050 PM EDT Thu Jun 19 2025
A cluster of thunderstorms is steadily marching southwest across the outer Gulf waters. There has been a slow and gradual downward trend in the strength and intensity over the past hour. Additional weakening is expected as it continues to move southwest. However, mariners should continue to exercise extreme caution as this activity is still capable of producing wind gusts near 30 knots, along with frequent lightning, and bouts of heavy rainfall.
From synopsis: Atlantic ridging across the Florida Peninsula will weaken over the next couple of days resulting in relaxing breezes.
The Atlantic ridging will consolidate off the southeast coast over the weekend and early next week returning moderate and periodically fresh breezes.
AVIATION
(00Z TAFS)
Issued at 1050 PM EDT Thu Jun 19 2025
VFR conditions will prevail across the island terminals tonight and into tomorrow morning. A slight chance still remains for isolated showers and thunderstorms to move across the airfields overnight but confidence on exact location and time remain uncertain. Therefore, they will be added in future amendments as needed.
KEY WATCHES/WARNINGS/ADVISORIES
FL...None.
GM...None.
| Stations | Dist | Age | Wind | Air | Water | Waves | inHg | DewPt |
| VCAF1 - 8723970 - Vaca Key, FL | 4 mi | 47 min | ESE 2.9G | 83°F | 88°F | |||
| SMKF1 - Sombrero Key, FL | 8 mi | 37 min | ESE 7G | 84°F | 30.12 | 74°F | ||
| LONF1 - Long Key, FL | 12 mi | 37 min | ESE 7G | 83°F | 30.09 | 74°F | ||
| KYWF1 - 8724580 - Key West, FL | 43 mi | 47 min | E 5.1G | 83°F | 87°F | 30.14 | ||
| SANF1 - Sand Key, FL | 49 mi | 37 min | E 8.9G | 83°F | 30.12 | 75°F |
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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