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.

Partly Cloudy

87°F

31°C

Humidity 70%
Wind Speed SE 5 mph
Barometer 29.95 in (1014.1 mb)
Dewpoint 76°F (24°C)
Visibility 10.00 mi
Heat Index98°F (37°C)
Last update 9 Aug 4:53 pm EDT
Extended Forecast for

Marathon FL

  • This Afternoon

    This Afternoon: A chance of showers and thunderstorms. Partly sunny, with a high near 88. Southeast wind around 5 mph. Chance of precipitation is 50%.

    High: 88 °F

    Chance
    T-storms

  • Tonight

    Tonight: A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 8pm. Mostly cloudy, with a low around 80. Southeast wind 5 to 10 mph. Chance of precipitation is 60%.

    Low: 80 °F

    Showers
    Likely

  • Sunday

    Sunday: Showers likely and possibly a thunderstorm. Mostly sunny, with a high near 90. Southeast wind around 5 mph. Chance of precipitation is 60%.

    High: 90 °F

    Showers
    Likely

  • Sunday Night

    Sunday Night: A chance of showers and thunderstorms. Partly cloudy, with a low around 81. Light southeast wind becoming east 5 to 10 mph after midnight. Chance of precipitation is 40%.

    Low: 81 °F

    Chance
    Showers

  • Monday

    Monday: A chance of showers and thunderstorms. Sunny, with a high near 90. East wind around 10 mph. Chance of precipitation is 40%.

    High: 90 °F

    Chance
    Showers

  • Monday Night

    Monday Night: A chance of showers and thunderstorms. Mostly clear, with a low around 82. Chance of precipitation is 40%.

    Low: 82 °F

    Chance
    Showers

  • Tuesday

    Tuesday: A chance of showers and thunderstorms. Sunny, with a high near 91. Chance of precipitation is 40%.

    High: 91 °F

    Chance
    Showers

  • Tuesday Night

    Tuesday Night: A chance of showers and thunderstorms. Partly cloudy, with a low around 82. Chance of precipitation is 40%.

    Low: 82 °F

    Chance
    Showers

  • Wednesday

    Wednesday: A chance of showers and thunderstorms. Mostly sunny, with a high near 92. Chance of precipitation is 40%.

    High: 92 °F

    Chance
    Showers

Detailed Forecast

This Afternoon
A chance of showers and thunderstorms. Partly sunny, with a high near 88. Southeast wind around 5 mph. Chance of precipitation is 50%.
Tonight
A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 8pm. Mostly cloudy, with a low around 80. Southeast wind 5 to 10 mph. Chance of precipitation is 60%.
Sunday
Showers likely and possibly a thunderstorm. Mostly sunny, with a high near 90. Southeast wind around 5 mph. Chance of precipitation is 60%.
Sunday Night
A chance of showers and thunderstorms. Partly cloudy, with a low around 81. Light southeast wind becoming east 5 to 10 mph after midnight. Chance of precipitation is 40%.
Monday
A chance of showers and thunderstorms. Sunny, with a high near 90. East wind around 10 mph. Chance of precipitation is 40%.
Monday Night
A chance of showers and thunderstorms. Mostly clear, with a low around 82. Chance of precipitation is 40%.
Tuesday
A chance of showers and thunderstorms. Sunny, with a high near 91. Chance of precipitation is 40%.
Tuesday Night
A chance of showers and thunderstorms. Partly cloudy, with a low around 82. Chance of precipitation is 40%.
Wednesday
A chance of showers and thunderstorms. Mostly sunny, with a high near 92. Chance of precipitation is 40%.
Wednesday Night
A chance of showers and thunderstorms. Partly cloudy, with a low around 82. Chance of precipitation is 40%.
Thursday
A chance of showers and thunderstorms. Mostly sunny, with a high near 92. Chance of precipitation is 40%.
Thursday Night
A chance of showers and thunderstorms. Partly cloudy, with a low around 82. Chance of precipitation is 40%.
Friday
A chance of showers and thunderstorms. Mostly sunny, with a high near 91. Chance of precipitation is 40%.
Friday Night
A chance of showers and thunderstorms. Partly cloudy, with a low around 81. Chance of precipitation is 40%.
Saturday
A chance of showers and thunderstorms. Mostly sunny, with a high near 90. Chance of precipitation is 40%.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Marathon FL
 24.7°N 81.1°W (Elev. 3 ft)
Last Update:
5:15 pm EDT Aug 9, 2025
Forecast Valid:
5pm EDT Aug 9, 2025-6pm EDT Aug 16, 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