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

77°F

25°C

Humidity 82%
Wind Speed NA
Barometer 29.96 in (1014.5 mb)
Dewpoint 71°F (22°C)
Visibility 10.00 mi
Heat Index79°F (26°C)
Last update 27 Apr 7:53 am EDT
Extended Forecast for

Marathon FL

  • Today

    Today: A slight chance of showers. Sunny, with a high near 85. North wind around 5 mph. Chance of precipitation is 10%.

    High: 85 °F

    Slight Chance
    Showers

  • Tonight

    Tonight: A slight chance of showers. Mostly clear, with a low around 76. North wind 5 to 10 mph becoming northeast after midnight. Chance of precipitation is 10%.

    Low: 76 °F

    Slight Chance
    Showers

  • Tuesday

    Tuesday: A slight chance of showers. Sunny, with a high near 85. Northeast wind around 10 mph. Chance of precipitation is 10%.

    High: 85 °F

    Slight Chance
    Showers

  • Tuesday Night

    Tuesday Night: A slight chance of showers. Mostly clear, with a low around 77. East wind around 10 mph. Chance of precipitation is 10%.

    Low: 77 °F

    Slight Chance
    Showers

  • Wednesday

    Wednesday: A slight chance of showers. Sunny, with a high near 86. East wind around 10 mph. Chance of precipitation is 10%.

    High: 86 °F

    Slight Chance
    Showers

  • Wednesday Night

    Wednesday Night: A slight chance of showers. Mostly clear, with a low around 77. Chance of precipitation is 10%.

    Low: 77 °F

    Slight Chance
    Showers

  • Thursday

    Thursday: A slight chance of showers. Sunny, with a high near 86. Chance of precipitation is 10%.

    High: 86 °F

    Slight Chance
    Showers

  • Thursday Night

    Thursday Night: Mostly clear, with a low around 75.

    Low: 75 °F

    Mostly Clear

  • Friday

    Friday: Sunny, with a high near 83.

    High: 83 °F

    Sunny

Detailed Forecast

Today
A slight chance of showers. Sunny, with a high near 85. North wind around 5 mph. Chance of precipitation is 10%.
Tonight
A slight chance of showers. Mostly clear, with a low around 76. North wind 5 to 10 mph becoming northeast after midnight. Chance of precipitation is 10%.
Tuesday
A slight chance of showers. Sunny, with a high near 85. Northeast wind around 10 mph. Chance of precipitation is 10%.
Tuesday Night
A slight chance of showers. Mostly clear, with a low around 77. East wind around 10 mph. Chance of precipitation is 10%.
Wednesday
A slight chance of showers. Sunny, with a high near 86. East wind around 10 mph. Chance of precipitation is 10%.
Wednesday Night
A slight chance of showers. Mostly clear, with a low around 77. Chance of precipitation is 10%.
Thursday
A slight chance of showers. Sunny, with a high near 86. Chance of precipitation is 10%.
Thursday Night
Mostly clear, with a low around 75.
Friday
Sunny, with a high near 83.
Friday Night
Mostly clear, with a low around 77.
Saturday
Sunny, with a high near 84.
Saturday Night
A slight chance of showers. Partly cloudy, with a low around 76. Chance of precipitation is 10%.
Sunday
A slight chance of showers and thunderstorms. Mostly sunny, with a high near 84. 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 81.07°W (Elev. 7 ft)
Last Update:
8:15 am EDT Apr 27, 2026
Forecast Valid:
8am EDT Apr 27, 2026-6pm EDT May 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