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

74°F

23°C

Humidity 69%
Wind Speed NE 9 mph
Barometer 30.10 in (1019.2 mb)
Dewpoint 63°F (17°C)
Visibility 10.00 mi
Last update 15 Apr 10:53 pm EDT
Extended Forecast for

Marathon FL

  • Tonight

    Tonight: Partly cloudy, with a low around 72. East wind 10 to 15 mph.

    Low: 72 °F

    Partly Cloudy

  • Thursday

    Thursday: Mostly sunny, with a high near 81. East wind around 10 mph.

    High: 81 °F

    Mostly Sunny

  • Thursday Night

    Thursday Night: Partly cloudy, with a low around 73. East wind 10 to 15 mph.

    Low: 73 °F

    Partly Cloudy

  • Friday

    Friday: Mostly sunny, with a high near 82. Northeast wind around 10 mph.

    High: 82 °F

    Mostly Sunny

  • Friday Night

    Friday Night: A slight chance of showers. Mostly clear, with a low around 75. East wind around 10 mph. Chance of precipitation is 10%.

    Low: 75 °F

    Slight Chance
    Showers

  • Saturday

    Saturday: Sunny, with a high near 83.

    High: 83 °F

    Sunny

  • Saturday Night

    Saturday Night: Partly cloudy, with a low around 75.

    Low: 75 °F

    Partly Cloudy

  • Sunday

    Sunday: Mostly sunny, with a high near 83.

    High: 83 °F

    Mostly Sunny

  • Sunday Night

    Sunday Night: Partly cloudy, with a low around 74.

    Low: 74 °F

    Partly Cloudy

Detailed Forecast

Tonight
Partly cloudy, with a low around 72. East wind 10 to 15 mph.
Thursday
Mostly sunny, with a high near 81. East wind around 10 mph.
Thursday Night
Partly cloudy, with a low around 73. East wind 10 to 15 mph.
Friday
Mostly sunny, with a high near 82. Northeast wind around 10 mph.
Friday Night
A slight chance of showers. Mostly clear, with a low around 75. East wind around 10 mph. Chance of precipitation is 10%.
Saturday
Sunny, with a high near 83.
Saturday Night
Partly cloudy, with a low around 75.
Sunday
Mostly sunny, with a high near 83.
Sunday Night
Partly cloudy, with a low around 74.
Monday
Mostly sunny, with a high near 81.
Monday Night
A slight chance of showers and thunderstorms. Partly cloudy, with a low around 73. Breezy. Chance of precipitation is 20%.
Tuesday
A slight chance of showers and thunderstorms. Partly sunny, with a high near 80. Windy. Chance of precipitation is 20%.
Tuesday Night
A slight chance of showers. Mostly cloudy, with a low around 72. Windy. Chance of precipitation is 20%.
Wednesday
A slight chance of showers. Partly sunny, with a high near 79. Breezy. Chance of precipitation is 10%.
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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:
11:15 pm EDT Apr 15, 2026
Forecast Valid:
11pm EDT Apr 15, 2026-6pm EDT Apr 22, 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