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

82°F

28°C

Humidity 67%
Wind Speed SE 8 mph
Barometer 29.91 in (1012.9 mb)
Dewpoint 70°F (21°C)
Visibility 10.00 mi
Heat Index86°F (30°C)
Last update 1 May 1:53 pm EDT
Extended Forecast for

Marathon FL

  • This Afternoon

    This Afternoon: Sunny, with a high near 85. South wind around 5 mph.

    High: 85 °F

    Sunny

  • Tonight

    Tonight: Partly cloudy, with a low around 79. Southeast wind 5 to 15 mph.

    Low: 79 °F

    Partly Cloudy

  • Saturday

    Saturday: Sunny, with a high near 86. South wind 10 to 15 mph.

    High: 86 °F

    Sunny

  • Saturday Night

    Saturday Night: A chance of showers and thunderstorms. Increasing clouds, with a low around 78. West wind around 5 mph becoming south after midnight. Chance of precipitation is 30%.

    Low: 78 °F

    Chance
    Showers

  • Sunday

    Sunday: A chance of showers and thunderstorms. Mostly cloudy, with a high near 84. West wind 5 to 10 mph. Chance of precipitation is 50%.

    High: 84 °F

    Chance
    T-storms

  • Sunday Night

    Sunday Night: Showers likely and possibly a thunderstorm. Mostly cloudy, with a low around 75. Chance of precipitation is 60%.

    Low: 75 °F

    Showers
    Likely

  • Monday

    Monday: A chance of showers and thunderstorms. Partly sunny, with a high near 82. Chance of precipitation is 30%.

    High: 82 °F

    Chance
    Showers

  • Monday Night

    Monday Night: A chance of showers and thunderstorms. Mostly cloudy, with a low around 75. Chance of precipitation is 30%.

    Low: 75 °F

    Chance
    Showers

  • Tuesday

    Tuesday: Mostly sunny, with a high near 84.

    High: 84 °F

    Mostly Sunny

Detailed Forecast

This Afternoon
Sunny, with a high near 85. South wind around 5 mph.
Tonight
Partly cloudy, with a low around 79. Southeast wind 5 to 15 mph.
Saturday
Sunny, with a high near 86. South wind 10 to 15 mph.
Saturday Night
A chance of showers and thunderstorms. Increasing clouds, with a low around 78. West wind around 5 mph becoming south after midnight. Chance of precipitation is 30%.
Sunday
A chance of showers and thunderstorms. Mostly cloudy, with a high near 84. West wind 5 to 10 mph. Chance of precipitation is 50%.
Sunday Night
Showers likely and possibly a thunderstorm. Mostly cloudy, with a low around 75. Chance of precipitation is 60%.
Monday
A chance of showers and thunderstorms. Partly sunny, with a high near 82. Chance of precipitation is 30%.
Monday Night
A chance of showers and thunderstorms. Mostly cloudy, with a low around 75. Chance of precipitation is 30%.
Tuesday
Mostly sunny, with a high near 84.
Tuesday Night
Mostly cloudy, with a low around 77.
Wednesday
Mostly sunny, with a high near 85.
Wednesday Night
Partly cloudy, with a low around 79.
Thursday
Sunny, with a high near 86.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Marathon FL
 24.72°N 81.07°W (Elev. 7 ft)
Last Update:
2:17 pm EDT May 1, 2026
Forecast Valid:
2pm EDT May 1, 2026-6pm EDT May 7, 2026
 
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