National Oceanic and Atmospheric Administration National Weather Service United States Department of Commerce

Hazardous Weather Conditions

Current conditions at

The Florida Keys - Marathon International Airport (KMTH)

Lat: 24.73°NLon: 81.05°WElev: 13ft.

A Few Clouds

84°F

29°C

Humidity 74%
Wind Speed SW 3 mph
Barometer 29.92 in (1013.0 mb)
Dewpoint 75°F (24°C)
Visibility 10.00 mi
Heat Index92°F (33°C)
Last update 29 Jul 3:53 am EDT
Extended Forecast for

Marathon FL

  • Overnight

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

    Low: 82 °F

    Slight Chance
    T-storms

  • Wednesday

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

    High: 91 °F

    Slight Chance
    T-storms

  • Wednesday Night

    Wednesday Night: Partly cloudy, with a low around 83. Southwest wind 5 to 10 mph.

    Low: 83 °F

    Partly Cloudy

  • Thursday

    Thursday: A slight chance of showers and thunderstorms after 9am. Sunny, with a high near 91. Southwest wind around 5 mph. Chance of precipitation is 10%.

    High: 91 °F

    Slight Chance
    T-storms

  • Thursday Night

    Thursday Night: Partly cloudy, with a low around 83. West wind around 5 mph becoming calm.

    Low: 83 °F

    Partly Cloudy

  • Friday

    Friday: A slight chance of showers and thunderstorms. Mostly sunny, with a high near 91. Chance of precipitation is 10%.

    High: 91 °F

    Slight Chance
    T-storms

  • Friday Night

    Friday Night: A slight chance of showers and thunderstorms. Partly cloudy, with a low around 83. Chance of precipitation is 10%.

    Low: 83 °F

    Slight Chance
    T-storms

  • Saturday

    Saturday: A slight chance of showers and thunderstorms. Mostly sunny, with a high near 91. Chance of precipitation is 10%.

    High: 91 °F

    Slight Chance
    T-storms

  • Saturday Night

    Saturday Night: A slight chance of showers. Mostly cloudy, with a low around 83. Chance of precipitation is 10%.

    Low: 83 °F

    Slight Chance
    Showers

Detailed Forecast

Overnight
A slight chance of showers and thunderstorms. Partly cloudy, with a low around 82. Southwest wind around 10 mph. Chance of precipitation is 10%.
Wednesday
A slight chance of showers and thunderstorms. Mostly sunny, with a high near 91. Southwest wind around 10 mph. Chance of precipitation is 10%.
Wednesday Night
Partly cloudy, with a low around 83. Southwest wind 5 to 10 mph.
Thursday
A slight chance of showers and thunderstorms after 9am. Sunny, with a high near 91. Southwest wind around 5 mph. Chance of precipitation is 10%.
Thursday Night
Partly cloudy, with a low around 83. West wind around 5 mph becoming calm.
Friday
A slight chance of showers and thunderstorms. Mostly sunny, with a high near 91. Chance of precipitation is 10%.
Friday Night
A slight chance of showers and thunderstorms. Partly cloudy, with a low around 83. Chance of precipitation is 10%.
Saturday
A slight chance of showers and thunderstorms. Mostly sunny, with a high near 91. Chance of precipitation is 10%.
Saturday Night
A slight chance of showers. Mostly cloudy, with a low around 83. Chance of precipitation is 10%.
Sunday
Mostly sunny, with a high near 90.
Sunday Night
A slight chance of showers. Partly cloudy, with a low around 83. Chance of precipitation is 10%.
Monday
A slight chance of showers and thunderstorms. Mostly sunny, with a high near 90. Chance of precipitation is 20%.
Monday Night
A slight chance of showers and thunderstorms. Partly cloudy, with a low around 82. Chance of precipitation is 20%.
Tuesday
A chance of showers and thunderstorms. Mostly sunny, with a high near 90. Chance of precipitation is 30%.
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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 ft)
Last Update:
4:15 am EDT Jul 29, 2026
Forecast Valid:
4am EDT Jul 29, 2026-6pm EDT Aug 4, 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