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 85%
Wind Speed Vrbl 3 mph
Barometer 29.90 in (1012.4 mb)
Dewpoint 77°F (25°C)
Visibility 10.00 mi
Heat Index90°F (32°C)
Last update 27 Jul 8:53 pm EDT
Extended Forecast for

Marathon FL

  • Tonight

    Tonight: A chance of showers and thunderstorms. Partly cloudy, with a low around 81. West wind around 5 mph. Chance of precipitation is 50%.

    Low: 81 °F

    Chance
    T-storms

  • Tuesday

    Tuesday: A chance of showers and thunderstorms. Mostly sunny, with a high near 91. Southwest wind 5 to 10 mph. Chance of precipitation is 50%.

    High: 91 °F

    Chance
    T-storms

  • Tuesday Night

    Tuesday Night: A slight chance of showers and thunderstorms. Partly cloudy, with a low around 82. West wind around 10 mph. Chance of precipitation is 20%.

    Low: 82 °F

    Slight Chance
    T-storms

  • Wednesday

    Wednesday: A slight chance of showers and thunderstorms. Sunny, with a high near 91. Southwest wind around 10 mph. Chance of precipitation is 20%.

    High: 91 °F

    Slight Chance
    T-storms

  • Wednesday Night

    Wednesday Night: A slight chance of showers and thunderstorms. Partly cloudy, with a low around 83. West wind 5 to 10 mph. Chance of precipitation is 10%.

    Low: 83 °F

    Slight Chance
    T-storms

  • Thursday

    Thursday: A slight chance of showers and thunderstorms. Mostly sunny, with a high near 92. Chance of precipitation is 10%.

    High: 92 °F

    Slight Chance
    T-storms

  • Thursday Night

    Thursday Night: Partly cloudy, with a low around 84.

    Low: 84 °F

    Partly Cloudy

  • Friday

    Friday: Mostly sunny, with a high near 90.

    High: 90 °F

    Mostly Sunny

  • Friday Night

    Friday Night: Partly cloudy, with a low around 84.

    Low: 84 °F

    Partly Cloudy

Detailed Forecast

Tonight
A chance of showers and thunderstorms. Partly cloudy, with a low around 81. West wind around 5 mph. Chance of precipitation is 50%.
Tuesday
A chance of showers and thunderstorms. Mostly sunny, with a high near 91. Southwest wind 5 to 10 mph. Chance of precipitation is 50%.
Tuesday Night
A slight chance of showers and thunderstorms. Partly cloudy, with a low around 82. West wind around 10 mph. Chance of precipitation is 20%.
Wednesday
A slight chance of showers and thunderstorms. Sunny, with a high near 91. Southwest wind around 10 mph. Chance of precipitation is 20%.
Wednesday Night
A slight chance of showers and thunderstorms. Partly cloudy, with a low around 83. West wind 5 to 10 mph. Chance of precipitation is 10%.
Thursday
A slight chance of showers and thunderstorms. Mostly sunny, with a high near 92. Chance of precipitation is 10%.
Thursday Night
Partly cloudy, with a low around 84.
Friday
Mostly sunny, with a high near 90.
Friday Night
Partly cloudy, with a low around 84.
Saturday
Mostly sunny, with a high near 90.
Saturday Night
Partly cloudy, with a low around 84.
Sunday
Mostly sunny, with a high near 90.
Sunday Night
A slight chance of showers and thunderstorms. Partly cloudy, with a low around 84. Chance of precipitation is 20%.
Monday
A slight chance of showers and thunderstorms. Mostly sunny, with a high near 90. Chance of precipitation is 20%.
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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:
9:15 pm EDT Jul 27, 2026
Forecast Valid:
9pm EDT Jul 27, 2026-6pm EDT Aug 3, 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