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

81°F

27°C

Humidity 74%
Wind Speed E 12 mph
Barometer 30.01 in (1016.1 mb)
Dewpoint 72°F (22°C)
Visibility 10.00 mi
Heat Index85°F (29°C)
Last update 18 Apr 12:53 pm EDT
Extended Forecast for

Marathon FL

  • This Afternoon

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

    High: 81 °F

    Mostly Sunny

  • Tonight

    Tonight: A slight chance of showers. Partly cloudy, with a low around 74. East wind around 10 mph. Chance of precipitation is 10%.

    Low: 74 °F

    Slight Chance
    Showers

  • Sunday

    Sunday: Partly sunny, with a high near 82. East wind around 5 mph.

    High: 82 °F

    Partly Sunny

  • Sunday Night

    Sunday Night: A slight chance of showers. Mostly cloudy, with a low around 74. North wind around 5 mph. Chance of precipitation is 10%.

    Low: 74 °F

    Slight Chance
    Showers

  • Monday

    Monday: A slight chance of showers. Partly sunny, with a high near 81. North wind around 5 mph becoming east in the afternoon. Chance of precipitation is 20%.

    High: 81 °F

    Slight Chance
    Showers

  • Monday Night

    Monday Night: A chance of showers and thunderstorms. Mostly cloudy, with a low around 72. Breezy. 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. Windy. Chance of precipitation is 20%.

    High: 78 °F

    Slight Chance
    Showers and
    Windy

  • Tuesday Night

    Tuesday Night: Partly cloudy, with a low around 71. Windy.

    Low: 71 °F

    Partly Cloudy
    and Windy

  • Wednesday

    Wednesday: Mostly sunny, with a high near 78. Breezy.

    High: 78 °F

    Mostly Sunny
    and Breezy

Detailed Forecast

This Afternoon
Mostly sunny, with a high near 81. East wind around 10 mph.
Tonight
A slight chance of showers. Partly cloudy, with a low around 74. East wind around 10 mph. Chance of precipitation is 10%.
Sunday
Partly sunny, with a high near 82. East wind around 5 mph.
Sunday Night
A slight chance of showers. Mostly cloudy, with a low around 74. North wind around 5 mph. Chance of precipitation is 10%.
Monday
A slight chance of showers. Partly sunny, with a high near 81. North wind around 5 mph becoming east in the afternoon. Chance of precipitation is 20%.
Monday Night
A chance of showers and thunderstorms. Mostly cloudy, with a low around 72. Breezy. Chance of precipitation is 30%.
Tuesday
A slight chance of showers. Mostly sunny, with a high near 78. Windy. Chance of precipitation is 20%.
Tuesday Night
Partly cloudy, with a low around 71. Windy.
Wednesday
Mostly sunny, with a high near 78. Breezy.
Wednesday Night
Mostly cloudy, with a low around 70.
Thursday
A slight chance of showers. Partly sunny, with a high near 78. Chance of precipitation is 20%.
Thursday Night
A slight chance of showers. Partly cloudy, with a low around 72. Chance of precipitation is 10%.
Friday
Mostly sunny, with a high near 80.
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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:
12:15 pm EDT Apr 18, 2026
Forecast Valid:
1pm EDT Apr 18, 2026-6pm EDT Apr 24, 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