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

29°C

85°F

Humidity 59%
Wind Speed Vrbl 9 km/h
Barometer 1016.6 mb (30.02 in)
Dewpoint 21°C (69°F)
Visibility 16 km
Heat Index32°C (89°F)
Last update 15 May 12:53 pm EDT
Extended Forecast for

Marathon FL

  • This Afternoon

    This Afternoon: Sunny, with a high near 30. West wind around 10 km/h.

    High: 30 °C

    Sunny

  • Tonight

    Tonight: A slight chance of showers. Mostly clear, with a low around 26. Calm wind becoming east 5 to 10 km/h after midnight. Chance of precipitation is 10%.

    Low: 26 °C

    Slight Chance
    Showers

  • Saturday

    Saturday: A slight chance of showers and thunderstorms. Mostly sunny, with a high near 31. East wind around 15 km/h. Chance of precipitation is 10%.

    High: 31 °C

    Slight Chance
    T-storms

  • Saturday Night

    Saturday Night: A chance of showers and thunderstorms. Partly cloudy, with a low around 27. East wind around 20 km/h. Chance of precipitation is 40%.

    Low: 27 °C

    Chance
    Showers

  • Sunday

    Sunday: A chance of showers and thunderstorms. Mostly sunny, with a high near 31. East wind around 20 km/h. Chance of precipitation is 40%.

    High: 31 °C

    Chance
    Showers

  • Sunday Night

    Sunday Night: A chance of showers and thunderstorms. Partly cloudy, with a low around 27. Chance of precipitation is 40%.

    Low: 27 °C

    Chance
    Showers

  • Monday

    Monday: A chance of showers and thunderstorms. Mostly sunny, with a high near 31. Chance of precipitation is 40%.

    High: 31 °C

    Chance
    Showers

  • Monday Night

    Monday Night: A slight chance of showers and thunderstorms. Partly cloudy, with a low around 27. Chance of precipitation is 20%.

    Low: 27 °C

    Slight Chance
    T-storms

  • Tuesday

    Tuesday: A slight chance of showers and thunderstorms. Sunny, with a high near 31. Chance of precipitation is 20%.

    High: 31 °C

    Slight Chance
    T-storms

Detailed Forecast

This Afternoon
Sunny, with a high near 30. West wind around 10 km/h.
Tonight
A slight chance of showers. Mostly clear, with a low around 26. Calm wind becoming east 5 to 10 km/h after midnight. Chance of precipitation is 10%.
Saturday
A slight chance of showers and thunderstorms. Mostly sunny, with a high near 31. East wind around 15 km/h. Chance of precipitation is 10%.
Saturday Night
A chance of showers and thunderstorms. Partly cloudy, with a low around 27. East wind around 20 km/h. Chance of precipitation is 40%.
Sunday
A chance of showers and thunderstorms. Mostly sunny, with a high near 31. East wind around 20 km/h. Chance of precipitation is 40%.
Sunday Night
A chance of showers and thunderstorms. Partly cloudy, with a low around 27. Chance of precipitation is 40%.
Monday
A chance of showers and thunderstorms. Mostly sunny, with a high near 31. Chance of precipitation is 40%.
Monday Night
A slight chance of showers and thunderstorms. Partly cloudy, with a low around 27. Chance of precipitation is 20%.
Tuesday
A slight chance of showers and thunderstorms. Sunny, with a high near 31. Chance of precipitation is 20%.
Tuesday Night
A slight chance of showers and thunderstorms. Partly cloudy, with a low around 27. Chance of precipitation is 20%.
Wednesday
A slight chance of showers and thunderstorms. Sunny, with a high near 31. Chance of precipitation is 20%.
Wednesday Night
A slight chance of showers. Partly cloudy, with a low around 27. Chance of precipitation is 10%.
Thursday
A slight chance of showers. Mostly sunny, with a high near 31. Chance of precipitation is 10%.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Marathon FL
 24.72°N 81.07°W (Elev. 7 m)
Last Update:
1:28 pm EDT May 15, 2026
Forecast Valid:
1pm EDT May 15, 2026-6pm EDT May 21, 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