National Oceanic and Atmospheric Administration National Weather Service United States Department of Commerce
Current conditions at

The Florida Keys - Marathon International Airport (KMTH)

Lat: 24.73°NLon: 81.05°WElev: 13ft.

A Few Clouds

79°F

26°C

Humidity 74%
Wind Speed SE 10 mph
Barometer 29.98 in (1015.0 mb)
Dewpoint 70°F (21°C)
Visibility 10.00 mi
Heat Index82°F (28°C)
Last update 7 May 6:53 am EDT
Extended Forecast for

Marathon FL

  • Today

    Today: Sunny, with a high near 86. Southeast wind 10 to 15 mph.

    High: 86 °F

    Sunny

  • Tonight

    Tonight: Mostly clear, with a low around 77. East wind around 10 mph.

    Low: 77 °F

    Mostly Clear

  • Thursday

    Thursday: Mostly sunny, with a high near 86. Southeast wind around 10 mph.

    High: 86 °F

    Mostly Sunny

  • Thursday Night

    Thursday Night: Mostly clear, with a low around 77. East wind around 10 mph.

    Low: 77 °F

    Mostly Clear

  • Friday

    Friday: Mostly sunny, with a high near 85. Southeast wind around 10 mph.

    High: 85 °F

    Mostly Sunny

  • Friday Night

    Friday Night: A slight chance of showers. Partly cloudy, with a low around 77. Chance of precipitation is 10%.

    Low: 77 °F

    Slight Chance
    Showers

  • Saturday

    Saturday: A slight chance of showers and thunderstorms. Mostly sunny, with a high near 86. Chance of precipitation is 20%.

    High: 86 °F

    Slight Chance
    T-storms

  • Saturday Night

    Saturday Night: A slight chance of showers and thunderstorms. Mostly cloudy, with a low around 78. Chance of precipitation is 20%.

    Low: 78 °F

    Slight Chance
    T-storms

  • Sunday

    Sunday: A chance of showers and thunderstorms. Partly sunny, with a high near 85. Chance of precipitation is 30%.

    High: 85 °F

    Chance
    Showers

Detailed Forecast

Today
Sunny, with a high near 86. Southeast wind 10 to 15 mph.
Tonight
Mostly clear, with a low around 77. East wind around 10 mph.
Thursday
Mostly sunny, with a high near 86. Southeast wind around 10 mph.
Thursday Night
Mostly clear, with a low around 77. East wind around 10 mph.
Friday
Mostly sunny, with a high near 85. Southeast wind around 10 mph.
Friday Night
A slight chance of showers. Partly cloudy, with a low around 77. Chance of precipitation is 10%.
Saturday
A slight chance of showers and thunderstorms. Mostly sunny, with a high near 86. Chance of precipitation is 20%.
Saturday Night
A slight chance of showers and thunderstorms. Mostly cloudy, with a low around 78. Chance of precipitation is 20%.
Sunday
A chance of showers and thunderstorms. Partly sunny, with a high near 85. Chance of precipitation is 30%.
Sunday Night
A chance of showers and thunderstorms. Mostly cloudy, with a low around 78. Chance of precipitation is 30%.
Monday
A chance of showers and thunderstorms. Mostly cloudy, with a high near 86. Chance of precipitation is 40%.
Monday Night
A chance of showers and thunderstorms. Mostly cloudy, with a low around 76. Chance of precipitation is 40%.
Tuesday
A chance of showers and thunderstorms. Partly sunny, with a high near 86. Chance of precipitation is 40%.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Marathon FL
 24.7°N 81.1°W (Elev. 3 ft)
Last Update:
8:15 am EDT May 7, 2025
Forecast Valid:
8am EDT May 7, 2025-6pm EDT May 13, 2025
 
Forecast Discussion
 
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Additional Resources

Radar & Satellite Image

Link to Local Radar Data Link to Satellite Data

Hourly Weather Forecast

National Digital Forecast Database

National Digital Forecast Database Maximum Temperature Forecast

High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation