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.

Fair

91°F

33°C

Humidity 56%
Wind Speed Vrbl 5 mph
Barometer 29.93 in (1013.4 mb)
Dewpoint 73°F (23°C)
Visibility 10.00 mi
Heat Index100°F (38°C)
Last update 18 Aug 11:53 am EDT
Extended Forecast for

Marathon FL

  • Today

    Today: A slight chance of showers and thunderstorms. Sunny, with a high near 90. North wind around 5 mph becoming northwest in the afternoon. Chance of precipitation is 20%.

    High: 90 °F

    Slight Chance
    T-storms

  • Tonight

    Tonight: A chance of showers and thunderstorms. Mostly clear, with a low around 82. Northwest wind around 5 mph. Chance of precipitation is 30%.

    Low: 82 °F

    Chance
    Showers

  • Tuesday

    Tuesday: A chance of showers and thunderstorms. Sunny, with a high near 91. North wind around 5 mph. Chance of precipitation is 30%.

    High: 91 °F

    Chance
    Showers

  • Tuesday Night

    Tuesday Night: A chance of showers and thunderstorms. Partly cloudy, with a low around 83. Northwest wind around 10 mph. Chance of precipitation is 30%.

    Low: 83 °F

    Chance
    Showers

  • Wednesday

    Wednesday: A chance of showers and thunderstorms. Mostly sunny, with a high near 90. Northwest wind around 10 mph. Chance of precipitation is 30%.

    High: 90 °F

    Chance
    Showers

  • Wednesday Night

    Wednesday Night: A chance of showers and thunderstorms. Partly cloudy, with a low around 83. Chance of precipitation is 30%.

    Low: 83 °F

    Chance
    Showers

  • Thursday

    Thursday: A chance of showers and thunderstorms. Mostly sunny, with a high near 90. Chance of precipitation is 30%.

    High: 90 °F

    Chance
    Showers

  • Thursday Night

    Thursday Night: A chance of showers and thunderstorms. Mostly clear, with a low around 84. Chance of precipitation is 30%.

    Low: 84 °F

    Chance
    Showers

  • Friday

    Friday: A chance of showers and thunderstorms. Sunny, with a high near 90. Chance of precipitation is 30%.

    High: 90 °F

    Chance
    Showers

Detailed Forecast

Today
A slight chance of showers and thunderstorms. Sunny, with a high near 90. North wind around 5 mph becoming northwest in the afternoon. Chance of precipitation is 20%.
Tonight
A chance of showers and thunderstorms. Mostly clear, with a low around 82. Northwest wind around 5 mph. Chance of precipitation is 30%.
Tuesday
A chance of showers and thunderstorms. Sunny, with a high near 91. North wind around 5 mph. Chance of precipitation is 30%.
Tuesday Night
A chance of showers and thunderstorms. Partly cloudy, with a low around 83. Northwest wind around 10 mph. Chance of precipitation is 30%.
Wednesday
A chance of showers and thunderstorms. Mostly sunny, with a high near 90. Northwest wind around 10 mph. Chance of precipitation is 30%.
Wednesday Night
A chance of showers and thunderstorms. Partly cloudy, with a low around 83. Chance of precipitation is 30%.
Thursday
A chance of showers and thunderstorms. Mostly sunny, with a high near 90. Chance of precipitation is 30%.
Thursday Night
A chance of showers and thunderstorms. Mostly clear, with a low around 84. Chance of precipitation is 30%.
Friday
A chance of showers and thunderstorms. Sunny, with a high near 90. Chance of precipitation is 30%.
Friday Night
A chance of showers and thunderstorms. Partly cloudy, with a low around 83. Chance of precipitation is 30%.
Saturday
A chance of showers and thunderstorms. Sunny, with a high near 89. Chance of precipitation is 30%.
Saturday Night
A chance of showers and thunderstorms. Mostly clear, with a low around 83. Chance of precipitation is 30%.
Sunday
A chance of showers and thunderstorms. Sunny, with a high near 89. Chance of precipitation is 30%.
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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:
11:15 am EDT Aug 18, 2025
Forecast Valid:
11am EDT Aug 18, 2025-6pm EDT Aug 24, 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