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

83°F

28°C

Humidity 74%
Wind Speed NW 12 mph
Barometer 29.84 in (1010.5 mb)
Dewpoint 74°F (23°C)
Visibility 10.00 mi
Heat Index90°F (32°C)
Last update 29 Sep 8:53 am EDT
Extended Forecast for

Marathon FL

  • Today

    Today: A slight chance of showers and thunderstorms. Sunny, with a high near 89. Northwest wind 10 to 15 mph. Chance of precipitation is 20%.

    High: 89 °F

    Slight Chance
    T-storms

  • Tonight

    Tonight: A slight chance of showers. Mostly clear, with a low around 81. West wind around 15 mph. Chance of precipitation is 20%.

    Low: 81 °F

    Slight Chance
    Showers

  • Tuesday

    Tuesday: A slight chance of showers and thunderstorms. Sunny, with a high near 89. West wind around 15 mph. Chance of precipitation is 20%.

    High: 89 °F

    Slight Chance
    T-storms

  • Tuesday Night

    Tuesday Night: A chance of showers and thunderstorms. Mostly clear, with a low around 79. Northwest wind 10 to 15 mph. Chance of precipitation is 30%.

    Low: 79 °F

    Chance
    Showers

  • Wednesday

    Wednesday: A chance of showers and thunderstorms. Sunny, with a high near 86. North wind around 10 mph. Chance of precipitation is 30%.

    High: 86 °F

    Chance
    Showers

  • Wednesday Night

    Wednesday Night: A chance of showers and thunderstorms. Mostly clear, with a low around 78. Chance of precipitation is 30%.

    Low: 78 °F

    Chance
    Showers

  • Thursday

    Thursday: A chance of showers and thunderstorms. Sunny, with a high near 87. Chance of precipitation is 40%.

    High: 87 °F

    Chance
    Showers

  • Thursday Night

    Thursday Night: A chance of showers and thunderstorms. Mostly clear, with a low around 78. Chance of precipitation is 40%.

    Low: 78 °F

    Chance
    Showers

  • Friday

    Friday: A chance of showers and thunderstorms. Mostly sunny, with a high near 85. Chance of precipitation is 40%.

    High: 85 °F

    Chance
    Showers

Detailed Forecast

Today
A slight chance of showers and thunderstorms. Sunny, with a high near 89. Northwest wind 10 to 15 mph. Chance of precipitation is 20%.
Tonight
A slight chance of showers. Mostly clear, with a low around 81. West wind around 15 mph. Chance of precipitation is 20%.
Tuesday
A slight chance of showers and thunderstorms. Sunny, with a high near 89. West wind around 15 mph. Chance of precipitation is 20%.
Tuesday Night
A chance of showers and thunderstorms. Mostly clear, with a low around 79. Northwest wind 10 to 15 mph. Chance of precipitation is 30%.
Wednesday
A chance of showers and thunderstorms. Sunny, with a high near 86. North wind around 10 mph. Chance of precipitation is 30%.
Wednesday Night
A chance of showers and thunderstorms. Mostly clear, with a low around 78. Chance of precipitation is 30%.
Thursday
A chance of showers and thunderstorms. Sunny, with a high near 87. Chance of precipitation is 40%.
Thursday Night
A chance of showers and thunderstorms. Mostly clear, with a low around 78. Chance of precipitation is 40%.
Friday
A chance of showers and thunderstorms. Mostly sunny, with a high near 85. Chance of precipitation is 40%.
Friday Night
A chance of showers and thunderstorms. Partly cloudy, with a low around 77. Chance of precipitation is 40%.
Saturday
A chance of showers and thunderstorms. Mostly sunny, with a high near 86. Chance of precipitation is 40%.
Saturday Night
A chance of showers and thunderstorms. Partly cloudy, with a low around 78. Chance of precipitation is 40%.
Sunday
A chance of showers and thunderstorms. Mostly sunny, with a high near 87. Chance of precipitation is 40%.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Marathon FL
 24.72°N 81.1°W (Elev. 0 ft)
Last Update:
9:15 am EDT Sep 29, 2025
Forecast Valid:
9am EDT Sep 29, 2025-6pm EDT Oct 5, 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