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.

Thunderstorm in Vicinity

82°F

28°C

Humidity 82%
Wind Speed Calm
Barometer 30.07 in (1018.1 mb)
Dewpoint 76°F (24°C)
Visibility 10.00 mi
Heat Index89°F (32°C)
Last update 24 Jun 4:53 am EDT
Extended Forecast for

Marathon FL

  • Today

    Today: Mostly sunny, with a high near 89. Southeast wind around 5 mph.

    High: 89 °F

    Mostly Sunny

  • Tonight

    Tonight: A slight chance of showers and thunderstorms. Partly cloudy, with a low around 82. East wind 5 to 10 mph. Chance of precipitation is 20%.

    Low: 82 °F

    Slight Chance
    T-storms

  • Thursday

    Thursday: Mostly sunny, with a high near 89. Southeast wind 5 to 10 mph.

    High: 89 °F

    Mostly Sunny

  • Thursday Night

    Thursday Night: A slight chance of showers and thunderstorms. Mostly clear, with a low around 83. East wind around 10 mph. Chance of precipitation is 10%.

    Low: 83 °F

    Slight Chance
    T-storms

  • Friday

    Friday: Sunny, with a high near 90. East wind around 10 mph.

    High: 90 °F

    Sunny

  • Friday Night

    Friday Night: Mostly clear, with a low around 83.

    Low: 83 °F

    Mostly Clear

  • Saturday

    Saturday: Sunny, with a high near 90.

    High: 90 °F

    Sunny

  • Saturday Night

    Saturday Night: A slight chance of showers. Mostly clear, with a low around 83. Chance of precipitation is 10%.

    Low: 83 °F

    Slight Chance
    Showers

  • Sunday

    Sunday: Sunny, with a high near 89.

    High: 89 °F

    Sunny

Detailed Forecast

Today
Mostly sunny, with a high near 89. Southeast wind around 5 mph.
Tonight
A slight chance of showers and thunderstorms. Partly cloudy, with a low around 82. East wind 5 to 10 mph. Chance of precipitation is 20%.
Thursday
Mostly sunny, with a high near 89. Southeast wind 5 to 10 mph.
Thursday Night
A slight chance of showers and thunderstorms. Mostly clear, with a low around 83. East wind around 10 mph. Chance of precipitation is 10%.
Friday
Sunny, with a high near 90. East wind around 10 mph.
Friday Night
Mostly clear, with a low around 83.
Saturday
Sunny, with a high near 90.
Saturday Night
A slight chance of showers. Mostly clear, with a low around 83. Chance of precipitation is 10%.
Sunday
Sunny, with a high near 89.
Sunday Night
Mostly clear, with a low around 83.
Monday
Sunny, with a high near 89.
Monday Night
A slight chance of showers and thunderstorms. Mostly clear, with a low around 82. Chance of precipitation is 20%.
Tuesday
A slight chance of showers and thunderstorms. Sunny, with a high near 89. Chance of precipitation is 20%.
Basemap Options
Click map to change the forecast location
Loading map...
Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Marathon FL
 24.72°N 81.07°W (Elev. 7 ft)
Last Update:
5:15 am EDT Jun 24, 2026
Forecast Valid:
5am EDT Jun 24, 2026-6pm EDT Jun 30, 2026
 
Forecast Discussion
 
Get as KML Get as XML

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