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

82°F

28°C

Humidity 74%
Wind Speed E 10 G 18 mph
Barometer 30.07 in (1018.2 mb)
Dewpoint 73°F (23°C)
Visibility 10.00 mi
Heat Index87°F (31°C)
Last update 17 May 8:53 am EDT
Extended Forecast for

Marathon FLSimilar City Names

  • Today

    Today: A chance of showers and thunderstorms. Partly sunny, with a high near 87. East wind around 15 mph. Chance of precipitation is 40%.

    High: 87 °F

    Chance
    Showers

  • Tonight

    Tonight: A chance of showers and thunderstorms. Partly cloudy, with a low around 80. East wind around 15 mph. Chance of precipitation is 30%.

    Low: 80 °F

    Chance
    Showers

  • Monday

    Monday: A chance of showers and thunderstorms. Mostly sunny, with a high near 88. East wind around 15 mph. Chance of precipitation is 30%.

    High: 88 °F

    Chance
    Showers

  • Monday Night

    Monday Night: A chance of showers and thunderstorms. Partly cloudy, with a low around 79. East wind around 15 mph. Chance of precipitation is 30%.

    Low: 79 °F

    Chance
    Showers

  • Tuesday

    Tuesday: A chance of showers and thunderstorms. Mostly sunny, with a high near 87. East wind around 15 mph. Chance of precipitation is 30%.

    High: 87 °F

    Chance
    Showers

  • Tuesday Night

    Tuesday Night: A chance of showers and thunderstorms. Partly cloudy, with a low around 80. Chance of precipitation is 30%.

    Low: 80 °F

    Chance
    Showers

  • Wednesday

    Wednesday: A chance of showers and thunderstorms. Mostly sunny, with a high near 87. Chance of precipitation is 30%.

    High: 87 °F

    Chance
    Showers

  • Wednesday Night

    Wednesday Night: A slight chance of showers. Partly cloudy, with a low around 80. Chance of precipitation is 10%.

    Low: 80 °F

    Slight Chance
    Showers

  • Thursday

    Thursday: Sunny, with a high near 87.

    High: 87 °F

    Sunny

Detailed Forecast

Today
A chance of showers and thunderstorms. Partly sunny, with a high near 87. East wind around 15 mph. Chance of precipitation is 40%.
Tonight
A chance of showers and thunderstorms. Partly cloudy, with a low around 80. East wind around 15 mph. Chance of precipitation is 30%.
Monday
A chance of showers and thunderstorms. Mostly sunny, with a high near 88. East wind around 15 mph. Chance of precipitation is 30%.
Monday Night
A chance of showers and thunderstorms. Partly cloudy, with a low around 79. East wind around 15 mph. Chance of precipitation is 30%.
Tuesday
A chance of showers and thunderstorms. Mostly sunny, with a high near 87. East wind around 15 mph. Chance of precipitation is 30%.
Tuesday Night
A chance of showers and thunderstorms. Partly cloudy, with a low around 80. Chance of precipitation is 30%.
Wednesday
A chance of showers and thunderstorms. Mostly sunny, with a high near 87. Chance of precipitation is 30%.
Wednesday Night
A slight chance of showers. Partly cloudy, with a low around 80. Chance of precipitation is 10%.
Thursday
Sunny, with a high near 87.
Thursday Night
A slight chance of showers. Mostly clear, with a low around 80. Chance of precipitation is 10%.
Friday
Mostly sunny, with a high near 88.
Friday Night
A slight chance of showers and thunderstorms. Partly cloudy, with a low around 81. Chance of precipitation is 20%.
Saturday
A slight chance of showers. Sunny, with a high near 89. Chance of precipitation is 10%.
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ABOUT THIS FORECAST

 
Point Forecast:
Marathon FLSimilar City Names
 24.72°N 81.07°W (Elev. 7 ft)
Last Update:
8:15 am EDT May 17, 2026
Forecast Valid:
9am EDT May 17, 2026-6pm EDT May 23, 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