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.

Thunderstorm in Vicinity Rain Fog/Mist

78°F

26°C

Humidity 87%
Wind Speed SW 8 mph
Barometer 29.95 in (1014.3 mb)
Dewpoint 74°F (23°C)
Visibility 3.00 mi
Heat Index80°F (27°C)
Last update 28 Jul 8:53 am EDT
Extended Forecast for

Marathon FL

  • Today

    Today: A chance of showers and thunderstorms. Mostly sunny, with a high near 90. West wind 5 to 10 mph. Chance of precipitation is 40%.

    High: 90 °F

    Chance
    T-storms

  • Tonight

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

    Low: 82 °F

    Slight Chance
    T-storms

  • Wednesday

    Wednesday: A slight chance of showers and thunderstorms. Mostly sunny, with a high near 90. Southwest wind around 10 mph. Chance of precipitation is 10%.

    High: 90 °F

    Slight Chance
    T-storms

  • Wednesday Night

    Wednesday Night: Mostly clear, with a low around 82. West wind 5 to 10 mph.

    Low: 82 °F

    Mostly Clear

  • Thursday

    Thursday: A slight chance of showers and thunderstorms after 9am. Sunny, with a high near 91. Southwest wind around 5 mph. Chance of precipitation is 10%.

    High: 91 °F

    Slight Chance
    T-storms

  • Thursday Night

    Thursday Night: Partly cloudy, with a low around 83.

    Low: 83 °F

    Partly Cloudy

  • Friday

    Friday: A slight chance of showers and thunderstorms. Mostly sunny, with a high near 91. Chance of precipitation is 10%.

    High: 91 °F

    Slight Chance
    T-storms

  • Friday Night

    Friday Night: Partly cloudy, with a low around 84.

    Low: 84 °F

    Partly Cloudy

  • Saturday

    Saturday: Mostly sunny, with a high near 90.

    High: 90 °F

    Mostly Sunny

Detailed Forecast

Today
A chance of showers and thunderstorms. Mostly sunny, with a high near 90. West wind 5 to 10 mph. Chance of precipitation is 40%.
Tonight
A slight chance of showers and thunderstorms. Partly cloudy, with a low around 82. West wind around 10 mph. Chance of precipitation is 10%.
Wednesday
A slight chance of showers and thunderstorms. Mostly sunny, with a high near 90. Southwest wind around 10 mph. Chance of precipitation is 10%.
Wednesday Night
Mostly clear, with a low around 82. West wind 5 to 10 mph.
Thursday
A slight chance of showers and thunderstorms after 9am. Sunny, with a high near 91. Southwest wind around 5 mph. Chance of precipitation is 10%.
Thursday Night
Partly cloudy, with a low around 83.
Friday
A slight chance of showers and thunderstorms. Mostly sunny, with a high near 91. Chance of precipitation is 10%.
Friday Night
Partly cloudy, with a low around 84.
Saturday
Mostly sunny, with a high near 90.
Saturday Night
Partly cloudy, with a low around 84.
Sunday
Mostly sunny, with a high near 90.
Sunday Night
A slight chance of showers. Partly cloudy, with a low around 84. Chance of precipitation is 10%.
Monday
A slight chance of showers. Mostly sunny, with a high near 90. Chance of precipitation is 10%.
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 81.1°W (Elev. 0 ft)
Last Update:
9:15 am EDT Jul 28, 2026
Forecast Valid:
9am EDT Jul 28, 2026-6pm EDT Aug 3, 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