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 77%
Wind Speed E 7 mph
Barometer 30.01 in (1016.1 mb)
Dewpoint 75°F (24°C)
Visibility 10.00 mi
Heat Index90°F (32°C)
Last update 11 Jun 8:53 am EDT
Extended Forecast for

Marathon FL

  • Today

    Today: A chance of showers and thunderstorms. Partly sunny, with a high near 89. East wind 5 to 10 mph. Chance of precipitation is 40%.

    High: 89 °F

    Chance
    Showers

  • Tonight

    Tonight: A slight chance of showers and thunderstorms. Partly cloudy, with a low around 80. East wind around 5 mph. Chance of precipitation is 10%.

    Low: 80 °F

    Slight Chance
    T-storms

  • Friday

    Friday: A slight chance of showers and thunderstorms. Mostly sunny, with a high near 89. East wind around 5 mph. Chance of precipitation is 20%.

    High: 89 °F

    Slight Chance
    T-storms

  • Friday Night

    Friday Night: A slight chance of showers and thunderstorms. Partly cloudy, with a low around 80. East wind around 5 mph. Chance of precipitation is 10%.

    Low: 80 °F

    Slight Chance
    T-storms

  • Saturday

    Saturday: A slight chance of showers and thunderstorms. Sunny, with a high near 89. East wind around 5 mph. Chance of precipitation is 20%.

    High: 89 °F

    Slight Chance
    T-storms

  • Saturday Night

    Saturday Night: A slight chance of showers and thunderstorms. Partly cloudy, with a low around 81. Chance of precipitation is 10%.

    Low: 81 °F

    Slight Chance
    T-storms

  • Sunday

    Sunday: A slight chance of showers and thunderstorms. Sunny, with a high near 88. Chance of precipitation is 10%.

    High: 88 °F

    Slight Chance
    T-storms

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 81.

    Low: 81 °F

    Mostly Clear

  • Monday

    Monday: Sunny, with a high near 88.

    High: 88 °F

    Sunny

Detailed Forecast

Today
A chance of showers and thunderstorms. Partly sunny, with a high near 89. East wind 5 to 10 mph. Chance of precipitation is 40%.
Tonight
A slight chance of showers and thunderstorms. Partly cloudy, with a low around 80. East wind around 5 mph. Chance of precipitation is 10%.
Friday
A slight chance of showers and thunderstorms. Mostly sunny, with a high near 89. East wind around 5 mph. Chance of precipitation is 20%.
Friday Night
A slight chance of showers and thunderstorms. Partly cloudy, with a low around 80. East wind around 5 mph. Chance of precipitation is 10%.
Saturday
A slight chance of showers and thunderstorms. Sunny, with a high near 89. East wind around 5 mph. Chance of precipitation is 20%.
Saturday Night
A slight chance of showers and thunderstorms. Partly cloudy, with a low around 81. Chance of precipitation is 10%.
Sunday
A slight chance of showers and thunderstorms. Sunny, with a high near 88. Chance of precipitation is 10%.
Sunday Night
Mostly clear, with a low around 81.
Monday
Sunny, with a high near 88.
Monday Night
Mostly clear, with a low around 82.
Tuesday
Sunny, with a high near 88.
Tuesday Night
Mostly clear, with a low around 82.
Wednesday
Mostly sunny, with a high near 89.
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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:
9:15 am EDT Jun 11, 2026
Forecast Valid:
9am EDT Jun 11, 2026-6pm EDT Jun 17, 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