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.

Fair

89°F

32°C

Humidity 65%
Wind Speed E 9 mph
Barometer 30.12 in (1019.9 mb)
Dewpoint 76°F (24°C)
Visibility 10.00 mi
Heat Index100°F (38°C)
Last update 7 Jul 11:53 am EDT
Extended Forecast for

Marathon FL

  • This Afternoon

    This Afternoon: A slight chance of showers and thunderstorms. Mostly sunny, with a high near 91. Southeast wind around 5 mph. Chance of precipitation is 20%.

    High: 91 °F

    Slight Chance
    T-storms

  • Tonight

    Tonight: A slight chance of showers and thunderstorms. Partly cloudy, with a low around 84. East wind around 10 mph. Chance of precipitation is 20%.

    Low: 84 °F

    Slight Chance
    T-storms

  • Wednesday

    Wednesday: A slight chance of showers and thunderstorms. Mostly sunny, with a high near 91. East wind around 10 mph. Chance of precipitation is 10%.

    High: 91 °F

    Slight Chance
    T-storms

  • Wednesday Night

    Wednesday Night: Partly cloudy, with a low around 84. East wind around 15 mph.

    Low: 84 °F

    Partly Cloudy

  • Thursday

    Thursday: Sunny, with a high near 92. Southeast wind around 15 mph.

    High: 92 °F

    Sunny

  • Thursday Night

    Thursday Night: A slight chance of showers and thunderstorms. Mostly clear, with a low around 83. Chance of precipitation is 20%.

    Low: 83 °F

    Slight Chance
    T-storms

  • Friday

    Friday: A chance of showers and thunderstorms. Sunny, with a high near 92. Chance of precipitation is 30%.

    High: 92 °F

    Chance
    Showers

  • Friday Night

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

    Low: 83 °F

    Partly Cloudy

  • Saturday

    Saturday: Mostly sunny, with a high near 90.

    High: 90 °F

    Mostly Sunny

Detailed Forecast

This Afternoon
A slight chance of showers and thunderstorms. Mostly sunny, with a high near 91. Southeast wind around 5 mph. Chance of precipitation is 20%.
Tonight
A slight chance of showers and thunderstorms. Partly cloudy, with a low around 84. East wind around 10 mph. Chance of precipitation is 20%.
Wednesday
A slight chance of showers and thunderstorms. Mostly sunny, with a high near 91. East wind around 10 mph. Chance of precipitation is 10%.
Wednesday Night
Partly cloudy, with a low around 84. East wind around 15 mph.
Thursday
Sunny, with a high near 92. Southeast wind around 15 mph.
Thursday Night
A slight chance of showers and thunderstorms. Mostly clear, with a low around 83. Chance of precipitation is 20%.
Friday
A chance of showers and thunderstorms. Sunny, with a high near 92. Chance of precipitation is 30%.
Friday Night
Partly cloudy, with a low around 83.
Saturday
Mostly sunny, with a high near 90.
Saturday Night
Partly cloudy, with a low around 84.
Sunday
Mostly sunny, with a high near 89.
Sunday Night
Mostly clear, with a low around 84.
Monday
Sunny, with a high near 90.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Marathon FL
 24.72°N 81.1°W (Elev. 0 ft)
Last Update:
11:15 am EDT Jul 7, 2026
Forecast Valid:
12pm EDT Jul 7, 2026-6pm EDT Jul 13, 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