Marine Weather and Tide Forecast for Marathon, FL
April 22, 2025 3:11 AM EDT (07:11 UTC) Change Location
 | Sunrise 6:57 AM Sunset 7:53 PM Moonrise 2:22 AM Moonset 1:38 PM |
GMZ043 Expires:202504220830;;234716 Fzus52 Kkey 220227 Cwfkey
coastal waters forecast for the florida keys national weather service key west fl 1027 pm edt Mon apr 21 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.
gmz042>044-220830- 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- 1027 pm edt Mon apr 21 2025
.small craft should exercise caution - .
Overnight - East winds 15 to 20 knots. Seas 2 to 4 feet, occasionally to 5 feet. NEarshore waters becoming choppy.
Tuesday - East winds 15 to 20 knots, decreasing to near 15 knots. Seas 2 to 3 feet. NEarshore waters choppy, becoming a moderate chop.
Tuesday night - East winds near 15 knots. Seas 2 to 3 feet. NEarshore waters a moderate chop.
Wednesday - East winds near 15 knots. Seas 2 to 3 feet. NEarshore waters a moderate chop.
Wednesday night - East winds 15 to 20 knots. Seas 2 to 3 feet. NEarshore waters choppy.
Thursday - East winds 15 to 20 knots. Seas 2 to 3 feet. NEarshore waters choppy. Isolated showers.
Thursday night - East winds near 20 knots. Seas 2 to 4 feet, occasionally to 5 feet. NEarshore waters rough. Isolated showers.
Friday - East winds near 20 knots. Seas 2 to 4 feet, occasionally to 5 feet. NEarshore waters rough. Isolated showers.
Friday night - East winds near 20 knots, decreasing to 15 to 20 knots. Seas 2 to 4 feet, occasionally to 5 feet. NEarshore waters rough, becoming choppy. Isolated showers.
Saturday - East winds near 15 knots. Seas 2 to 3 feet. NEarshore waters a moderate chop. Isolated showers.
Saturday night - East winds 10 to 15 knots. Seas 2 to 3 feet. NEarshore waters a light to moderate chop. Isolated showers.
coastal waters forecast for the florida keys national weather service key west fl 1027 pm edt Mon apr 21 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.
gmz042>044-220830- 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- 1027 pm edt Mon apr 21 2025
GMZ005 Synopsis For Keys Coastal Waters From Ocean Reef To Dry Tortugas 1027 Pm Edt Mon Apr 21 2025
Synopsis - Fresh easterly breezes will prevail for the rest of tonight and into tomorrow morning. As the surface high north of the bahamas wobbles about, generally east breezes will be generally moderate peaking at night and lulling during the day. Later this week, the high will strengthen once again allowing for another round of fresh breezes as early as Thursday.
the approximate shoreward edge of the gulf stream as of april 16 - .
30 nm south of dry tortugas light - .on loggerhead key. 8 nm south of cosgrove shoal light - .off the marquesas keys. 5 nm south of sand key light - .off key west. 9 nm south of looe key - .off big pine key. 13 nm south of sombrero key light - .off marathon. 15 nm southeast of alligator reef light - .off islamorada. 14 nm southeast of molasses reef light - .off key largo. 12 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 april 16 - .
30 nm south of dry tortugas light - .on loggerhead key. 8 nm south of cosgrove shoal light - .off the marquesas keys. 5 nm south of sand key light - .off key west. 9 nm south of looe key - .off big pine key. 13 nm south of sombrero key light - .off marathon. 15 nm southeast of alligator reef light - .off islamorada. 14 nm southeast of molasses reef light - .off key largo. 12 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 Tue -- 03:22 AM EDT Moonrise Tue -- 05:48 AM EDT 0.93 feet High Tide Tue -- 06:55 AM EDT Sunrise Tue -- 10:44 AM EDT 0.43 feet Low Tide Tue -- 02:37 PM EDT Moonset Tue -- 04:47 PM EDT 1.42 feet High Tide Tue -- 07:49 PM EDT Sunset Tide / Current data from XTide NOT FOR NAVIGATION |
Vaca Key-Fat Deer Key bridge, Florida, Tide feet
| 12 am |
| 0.1 |
| 1 am |
| 0.2 |
| 2 am |
| 0.4 |
| 3 am |
| 0.6 |
| 4 am |
| 0.8 |
| 5 am |
| 0.9 |
| 6 am |
| 0.9 |
| 7 am |
| 0.9 |
| 8 am |
| 0.7 |
| 9 am |
| 0.6 |
| 10 am |
| 0.5 |
| 11 am |
| 0.4 |
| 12 pm |
| 0.5 |
| 1 pm |
| 0.8 |
| 2 pm |
| 1 |
| 3 pm |
| 1.2 |
| 4 pm |
| 1.4 |
| 5 pm |
| 1.4 |
| 6 pm |
| 1.4 |
| 7 pm |
| 1.2 |
| 8 pm |
| 0.9 |
| 9 pm |
| 0.6 |
| 10 pm |
| 0.3 |
| 11 pm |
| 0.1 |
| Moser Channel (swingbridge) Click for Map Tue -- 02:21 AM EDT 0.00 knots Slack Tue -- 03:23 AM EDT Moonrise Tue -- 05:13 AM EDT 1.12 knots Max Flood Tue -- 06:56 AM EDT Sunrise Tue -- 08:30 AM EDT -0.00 knots Slack Tue -- 11:39 AM EDT -1.40 knots Max Ebb Tue -- 02:38 PM EDT Moonset Tue -- 02:55 PM EDT 0.00 knots Slack Tue -- 05:33 PM EDT 0.99 knots Max Flood Tue -- 07:50 PM EDT Sunset Tue -- 08:33 PM EDT -0.00 knots Slack Tue -- 11:58 PM EDT -1.77 knots Max Ebb Tide / Current data from XTide NOT FOR NAVIGATION |
Moser Channel (swingbridge), Florida Current, knots
| 12 am |
| -1.3 |
| 1 am |
| -0.9 |
| 2 am |
| -0.3 |
| 3 am |
| 0.4 |
| 4 am |
| 0.9 |
| 5 am |
| 1.1 |
| 6 am |
| 1.1 |
| 7 am |
| 0.8 |
| 8 am |
| 0.3 |
| 9 am |
| -0.3 |
| 10 am |
| -1 |
| 11 am |
| -1.3 |
| 12 pm |
| -1.4 |
| 1 pm |
| -1.1 |
| 2 pm |
| -0.6 |
| 3 pm |
| 0.1 |
| 4 pm |
| 0.6 |
| 5 pm |
| 1 |
| 6 pm |
| 1 |
| 7 pm |
| 0.8 |
| 8 pm |
| 0.4 |
| 9 pm |
| -0.3 |
| 10 pm |
| -1.1 |
| 11 pm |
| -1.6 |
FXUS62 KKEY 220241 AFDKEY
Area Forecast Discussion National Weather Service Key West FL 1041 PM EDT Mon Apr 21 2025
New DISCUSSION, MARINE, AVIATION
DISCUSSION
Issued at 1040 PM EDT Mon Apr 21 2025 Another quiet but breezy evening is upon the Florida Keys. Daytime heating breifly reduced winds earlier this afternoon. They have now since rebounded with fresh northeast to east breezes reading along the Reef tract. Similar to last night, Nighttime Microphysics imagery notes a few broken lines of fair weather cumulus streaming over the Straits of Florida from the east. KBYX has been mostly free of precipitable echoes with perhaps a shower or two pulsing along the previously mentioned cloud lines.
Temperatures are very similar to 24 hours ago with current observations ranging in the mid to upper 70s and somewhat moist dewpoints in the upper 60s.
The surface high north of The Bahamas continues to be in control of our sensible weather pattern in the short term. This high is the current culprit behind the fresh northeast to east breezes across our waters. As it weakens and wobbles, breezes will gradually slacken overall tomorrow morning, but the same pattern of lulls during the afternoon and peaks at night will continue this week. Our 00z sounding from earlier this evening shows some increase in moisture above the 850 mb inversion from yesterday, but is still quite dry with most moisture found below. CIMSS MIMIC PW shows a large swath of drier air upstream of southeast low to mid level flow resulting in dry conditions promoting near nil PoPs for the next few days or so. No changes to the forecast are required at this time.
MARINE
Issued at 1040 PM EDT Mon Apr 21 2025 No watches, warnings, or advisories are currently in effect for the coastal waters of the Florida Keys, but Small Craft Should Exercise Caution on all waters except for Florida Bay. From synopsis, fresh easterly breezes will prevail for the rest of tonight and into tomorrow morning. As the surface high north of The Bahamas wobbles about, generally east breezes will remain on average moderate peaking at night and lulling during the day.
Later this week, the high will strengthen once again allowing for another round of fresh breezes as early as Thursday.
AVIATION
(00Z TAFS)
Issued at 1040 PM EDT Mon Apr 21 2025 VFR and dry conditions will prevail at both EYW and MTH tonight and into tomorrow. Near surface winds will be generally out of the east at 10 to 15 knots with occasional to frequent gusts up to near 20 knots.
PRELIMINARY POINT TEMPS/POPS
Key West 74 83 74 83 / 0 0 0 0 Marathon 74 81 75 82 / 0 0 0 0
KEY WATCHES/WARNINGS/ADVISORIES
FL...None.
GM...None.
Area Forecast Discussion National Weather Service Key West FL 1041 PM EDT Mon Apr 21 2025
New DISCUSSION, MARINE, AVIATION
DISCUSSION
Issued at 1040 PM EDT Mon Apr 21 2025 Another quiet but breezy evening is upon the Florida Keys. Daytime heating breifly reduced winds earlier this afternoon. They have now since rebounded with fresh northeast to east breezes reading along the Reef tract. Similar to last night, Nighttime Microphysics imagery notes a few broken lines of fair weather cumulus streaming over the Straits of Florida from the east. KBYX has been mostly free of precipitable echoes with perhaps a shower or two pulsing along the previously mentioned cloud lines.
Temperatures are very similar to 24 hours ago with current observations ranging in the mid to upper 70s and somewhat moist dewpoints in the upper 60s.
The surface high north of The Bahamas continues to be in control of our sensible weather pattern in the short term. This high is the current culprit behind the fresh northeast to east breezes across our waters. As it weakens and wobbles, breezes will gradually slacken overall tomorrow morning, but the same pattern of lulls during the afternoon and peaks at night will continue this week. Our 00z sounding from earlier this evening shows some increase in moisture above the 850 mb inversion from yesterday, but is still quite dry with most moisture found below. CIMSS MIMIC PW shows a large swath of drier air upstream of southeast low to mid level flow resulting in dry conditions promoting near nil PoPs for the next few days or so. No changes to the forecast are required at this time.
MARINE
Issued at 1040 PM EDT Mon Apr 21 2025 No watches, warnings, or advisories are currently in effect for the coastal waters of the Florida Keys, but Small Craft Should Exercise Caution on all waters except for Florida Bay. From synopsis, fresh easterly breezes will prevail for the rest of tonight and into tomorrow morning. As the surface high north of The Bahamas wobbles about, generally east breezes will remain on average moderate peaking at night and lulling during the day.
Later this week, the high will strengthen once again allowing for another round of fresh breezes as early as Thursday.
AVIATION
(00Z TAFS)
Issued at 1040 PM EDT Mon Apr 21 2025 VFR and dry conditions will prevail at both EYW and MTH tonight and into tomorrow. Near surface winds will be generally out of the east at 10 to 15 knots with occasional to frequent gusts up to near 20 knots.
PRELIMINARY POINT TEMPS/POPS
Key West 74 83 74 83 / 0 0 0 0 Marathon 74 81 75 82 / 0 0 0 0
KEY WATCHES/WARNINGS/ADVISORIES
FL...None.
GM...None.
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
Edit Hide
Key West, FL,
NOTICE: Some pages have affiliate links to Amazon. As an Amazon Associate, I earn from qualifying purchases. Please read website Cookie, Privacy, and Disclamers by clicking HERE. To contact me click HERE. For my YouTube page click HERE