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

28°C

83°F

Humidity 74%
Wind Speed SW 13 G 30 km/h
Barometer 1017.0 mb (30.03 in)
Dewpoint 23°C (74°F)
Visibility 16 km
Heat Index32°C (90°F)
Last update 14 Jul 4:53 pm EDT
Extended Forecast for

Marathon FL

  • This Afternoon

    This Afternoon: A chance of showers and thunderstorms. Partly sunny, with a high near 33. Northwest wind around 10 km/h. Chance of precipitation is 50%.

    High: 33 °C

    Chance
    T-storms

  • Tonight

    Tonight: A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 8pm. Mostly cloudy, with a low around 24. Calm wind. Chance of precipitation is 70%.

    Low: 24 °C

    Showers
    Likely

  • Tuesday

    Tuesday: Showers and possibly a thunderstorm. High near 30. South wind around 10 km/h. Chance of precipitation is 80%.

    High: 30 °C

    Showers

  • Tuesday Night

    Tuesday Night: Showers likely and possibly a thunderstorm. Mostly cloudy, with a low around 27. Southeast wind 5 to 10 km/h increasing to 15 to 20 km/h after midnight. Chance of precipitation is 60%.

    Low: 27 °C

    Showers
    Likely

  • Wednesday

    Wednesday: Showers likely and possibly a thunderstorm. Mostly cloudy, with a high near 32. Southeast wind 10 to 20 km/h. Chance of precipitation is 60%.

    High: 32 °C

    Showers
    Likely

  • Wednesday Night

    Wednesday Night: A chance of showers and thunderstorms. Mostly cloudy, with a low around 27. Chance of precipitation is 40%.

    Low: 27 °C

    Chance
    Showers

  • Thursday

    Thursday: A chance of showers and thunderstorms. Partly sunny, with a high near 33. Chance of precipitation is 40%.

    High: 33 °C

    Chance
    Showers

  • Thursday Night

    Thursday Night: A chance of showers and thunderstorms. Partly cloudy, with a low around 28. Chance of precipitation is 30%.

    Low: 28 °C

    Chance
    Showers

  • Friday

    Friday: A chance of showers and thunderstorms. Mostly sunny, with a high near 33. Chance of precipitation is 30%.

    High: 33 °C

    Chance
    Showers

Detailed Forecast

This Afternoon
A chance of showers and thunderstorms. Partly sunny, with a high near 33. Northwest wind around 10 km/h. Chance of precipitation is 50%.
Tonight
A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 8pm. Mostly cloudy, with a low around 24. Calm wind. Chance of precipitation is 70%.
Tuesday
Showers and possibly a thunderstorm. High near 30. South wind around 10 km/h. Chance of precipitation is 80%.
Tuesday Night
Showers likely and possibly a thunderstorm. Mostly cloudy, with a low around 27. Southeast wind 5 to 10 km/h increasing to 15 to 20 km/h after midnight. Chance of precipitation is 60%.
Wednesday
Showers likely and possibly a thunderstorm. Mostly cloudy, with a high near 32. Southeast wind 10 to 20 km/h. Chance of precipitation is 60%.
Wednesday Night
A chance of showers and thunderstorms. Mostly cloudy, with a low around 27. Chance of precipitation is 40%.
Thursday
A chance of showers and thunderstorms. Partly sunny, with a high near 33. Chance of precipitation is 40%.
Thursday Night
A chance of showers and thunderstorms. Partly cloudy, with a low around 28. Chance of precipitation is 30%.
Friday
A chance of showers and thunderstorms. Mostly sunny, with a high near 33. Chance of precipitation is 30%.
Friday Night
A chance of showers and thunderstorms. Partly cloudy, with a low around 28. Chance of precipitation is 30%.
Saturday
A chance of showers and thunderstorms. Mostly sunny, with a high near 33. Chance of precipitation is 30%.
Saturday Night
A chance of showers and thunderstorms. Mostly clear, with a low around 28. Chance of precipitation is 30%.
Sunday
A chance of showers and thunderstorms. Mostly sunny, with a high near 33. Chance of precipitation is 30%.
Sunday Night
A chance of showers and thunderstorms. Partly cloudy, with a low around 27. Chance of precipitation is 30%.
Monday
A chance of showers and thunderstorms. Mostly sunny, with a high near 32. Chance of precipitation is 30%.
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 m)
Last Update:
5:15 pm EDT Jul 14, 2025
Forecast Valid:
5pm EDT Jul 14, 2025-6pm EDT Jul 21, 2025
 
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