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

78°F

26°C

Humidity 76%
Wind Speed N 7 mph
Barometer 30.03 in (1017.0 mb)
Dewpoint 70°F (21°C)
Visibility 10.00 mi
Heat Index80°F (27°C)
Last update 19 Apr 10:53 pm EDT
Extended Forecast for

Marathon FL

  • Tonight

    Tonight: Mostly cloudy, with a low around 74. North wind around 5 mph.

    Low: 74 °F

    Mostly Cloudy

  • Monday

    Monday: A slight chance of showers. Mostly sunny, with a high near 82. North wind around 5 mph. Chance of precipitation is 20%.

    High: 82 °F

    Slight Chance
    Showers

  • Monday Night

    Monday Night: A chance of showers and thunderstorms. Mostly cloudy, with a low around 72. Breezy, with a northeast wind 15 to 20 mph. Chance of precipitation is 30%.

    Low: 72 °F

    Chance
    Showers and
    Breezy

  • Tuesday

    Tuesday: A slight chance of showers. Mostly sunny, with a high near 78. Breezy, with a northeast wind around 20 mph. Chance of precipitation is 20%.

    High: 78 °F

    Slight Chance
    Showers and
    Breezy

  • Tuesday Night

    Tuesday Night: Mostly clear, with a low around 71. Breezy, with an east wind around 20 mph.

    Low: 71 °F

    Mostly Clear
    and Breezy

  • Wednesday

    Wednesday: Mostly sunny, with a high near 78.

    High: 78 °F

    Mostly Sunny

  • Wednesday Night

    Wednesday Night: Mostly cloudy, with a low around 71.

    Low: 71 °F

    Mostly Cloudy

  • Thursday

    Thursday: A slight chance of showers. Partly sunny, with a high near 79. Chance of precipitation is 10%.

    High: 79 °F

    Slight Chance
    Showers

  • Thursday Night

    Thursday Night: A slight chance of showers. Mostly cloudy, with a low around 72. Chance of precipitation is 20%.

    Low: 72 °F

    Slight Chance
    Showers

Detailed Forecast

Tonight
Mostly cloudy, with a low around 74. North wind around 5 mph.
Monday
A slight chance of showers. Mostly sunny, with a high near 82. North wind around 5 mph. Chance of precipitation is 20%.
Monday Night
A chance of showers and thunderstorms. Mostly cloudy, with a low around 72. Breezy, with a northeast wind 15 to 20 mph. Chance of precipitation is 30%.
Tuesday
A slight chance of showers. Mostly sunny, with a high near 78. Breezy, with a northeast wind around 20 mph. Chance of precipitation is 20%.
Tuesday Night
Mostly clear, with a low around 71. Breezy, with an east wind around 20 mph.
Wednesday
Mostly sunny, with a high near 78.
Wednesday Night
Mostly cloudy, with a low around 71.
Thursday
A slight chance of showers. Partly sunny, with a high near 79. Chance of precipitation is 10%.
Thursday Night
A slight chance of showers. Mostly cloudy, with a low around 72. Chance of precipitation is 20%.
Friday
Mostly sunny, with a high near 80.
Friday Night
Partly cloudy, with a low around 74.
Saturday
Sunny, with a high near 81.
Saturday Night
Mostly clear, with a low around 75.
Sunday
Sunny, with a high near 82.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Marathon FL
 24.72°N 81.07°W (Elev. 7 ft)
Last Update:
11:15 pm EDT Apr 19, 2026
Forecast Valid:
11pm EDT Apr 19, 2026-6pm EDT Apr 26, 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