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Marathon, FL Weather
Current conditions
Observed at The Florida Keys - Marathon International Airport · 44 min ago
Forecast
10-day-
Wednesday
Sunny, with a high near 84. Northeast wind 10 to 15 mph.
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Wednesday Night
Mostly clear, with a low around 75. Northeast wind around 10 mph.
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Thursday
A slight chance of rain showers after 8am. Sunny, with a high near 83. Northeast wind 5 to 10 mph.
National Weather Service forecast updated 21 hrs ago.
Hourly
Hourly forecast- Now76°
- 9 AM77°
- 10 AM79°
- 11 AM81°
- 12 PM81°
- 1 PM83°
- 2 PM83°
- 3 PM83°
- 4 PM84°
- 5 PM83°
- 6 PM83°
- 7 PM81°
- 8 PM79°
- 9 PM79°
- 10 PM79°
- 11 PM78°
- Thu12 AM77°
- 1 AM77°
- 2 AM77°
- 3 AM77°
- 4 AM76°
- 5 AM76°
- 6 AM76°
- 7 AM75°
10-day forecast
Details- TueOct 20Sunny76°86°
- TodayOct 21Sunny75°84°
- ThuOct 22Slight Chance Rain Showers20%74°83°
- FriOct 23Slight Chance Showers And Thunderstorms then Chance Showers And Thunderstorms48%75°83°
- SatOct 24Chance Showers And Thunderstorms then Showers And Thunderstorms Likely69%75°83°
- SunOct 25Showers And Thunderstorms Likely67%76°83°
- MonOct 26Chance Rain Showers44%75°83°
- TueOct 27Light rain0.17 in77°82°
- WedOct 28Partly cloudy81°83°
- ThuOct 29Mostly sunny0.03 in81°82°
Days after the National Weather Service's seven are MET Norway's outlook, a computer model with no forecaster's review.
Radar
Full mapWeather news near Marathon
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Air quality
Forecast
- WedGood
- ThuGood
- FriGood
Monroe County, FL reporting area. Data from AirNow (EPA and its state, local and tribal partners); preliminary and subject to change.
Sun & moon
Almanac
MonthlyMarathon Area, records since 1950. Normals 1991–2020. Data from NOAA's Regional Climate Centers (ACIS).
Nearby
- Islamorada 52 km
- Big Pine Key 27 km
- Big Coppitt Key 59 km
Forecasters' discussion
From the National Weather Service office in KEY, issued 22 hrs ago
Key Messages
- A Small Craft Advisory remains in effect for all Florida Keys coastal waters.
- Windy conditions will continue across the Keys through Wednesday morning. Breezes will gradually slacken thereafter through Friday morning.
- Breezes will once again freshen late Friday through the early next week, with another period of windy conditions for the Keys.
Discussion
Issued at 935 AM EDT Tue Oct 20 2026 The 12z morning sounding at KEY sampled a well-mixed layer from the surface up to 950 mb, with a generally stable layer above, and a strong cap of copious dry air above 775 mb. The sounding also sampled a low-level veering profile. Coupled with sea surface temperatures remaining in the mid 80s across the Straits, KBYX and KAMX available Doppler radars continue to highlight a few isolated showers, mainly in the vicinity of the Upper Keys as well as the Straits of Florida 20 to 60 nm offshore of the Keys.
For the rest of today, the Florida Keys will remain sandwiched between a continental high pressure system centered over southern Canada, and a Nor'easter a centered a few hundred miles off the Carolina coastline. This will support a continued strong pressure gradient and associated windy conditions. While an isolated shower cannot be completely ruled out for the balance of today, most island communities will remain dry. The inherited 10% PoP seems on track, most likely verifying between Key Largo and Ocean Reef. No changes proposed.
Marine
Issued at 935 AM EDT Tue Oct 20 2026 A Small Craft Advisory remains in effect for all Florida Keys marine zones. Winds will begin to slacken and seas subside throughout the day on Wednesday, before breezes once again freshen by late Friday through the weekend. Additional Small Craft Advisories will likely be required for that time frame, with near-gale winds possible, especially Saturday night through Monday.
Aviation
(12Z TAFS) Issued at 935 AM EDT Tue Oct 20 2026 Although a passing shower cannot be ruled out, especially in the favored overnight period, impacts to ceilings and visbilities from any activity should be minimal. Near-surface winds out of the northeast will frequently gust to 20 to 25 knots through 12z Wednesday morning.
Forecasts, observations and alerts in the United States come from the National Weather Service (NOAA); radar from NOAA's Multi-Radar Multi-Sensor system; satellite imagery from NASA's Global Imagery Browse Services (GIBS) and NOAA's GOES satellites; the map from the U.S. Geological Survey's National Map; air quality from AirNow (EPA and its partners); hurricane information from the National Hurricane Center; climate normals and records from NOAA's Regional Climate Centers (ACIS). Forecasts outside the United States and the UV index: MET Norway (CC BY 4.0); observations outside the U.S.: airport reports via NOAA's Aviation Weather Center. Place names: GeoNames (CC BY 4.0). Data are copied on a schedule and may lag the sources; for warnings that affect your safety, follow your local National Weather Service office and emergency officials. Weather news is drawn from the 4Search index and reflects what the press published. Terms of use.