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

84°F

29°C

Humidity 77%
Wind Speed NE 5 mph
Barometer 30.06 in (1018.0 mb)
Dewpoint 76°F (24°C)
Visibility 10.00 mi
Heat Index93°F (34°C)
Last update 20 Jun 12:53 am EDT
Extended Forecast for

Marathon FL

  • Overnight

    Overnight: A slight chance of showers and thunderstorms. Partly cloudy, with a low around 84. Southeast wind 5 to 10 mph. Chance of precipitation is 10%.

    Low: 84 °F

    Slight Chance
    T-storms

  • Saturday

    Saturday: A slight chance of showers and thunderstorms. Mostly sunny, with a high near 88. Southeast wind around 5 mph. Chance of precipitation is 10%.

    High: 88 °F

    Slight Chance
    T-storms

  • Saturday Night

    Saturday Night: Partly cloudy, with a low around 84. Calm wind becoming east around 5 mph after midnight.

    Low: 84 °F

    Partly Cloudy

  • Sunday

    Sunday: Mostly sunny, with a high near 88. Southeast wind around 5 mph becoming calm in the morning.

    High: 88 °F

    Mostly Sunny

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 84. Northwest wind around 5 mph becoming southeast after midnight.

    Low: 84 °F

    Mostly Clear

  • Monday

    Monday: Mostly sunny, with a high near 88.

    High: 88 °F

    Mostly Sunny

  • Monday Night

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

    Low: 83 °F

    Partly Cloudy

  • Tuesday

    Tuesday: Mostly sunny, with a high near 88.

    High: 88 °F

    Mostly Sunny

  • Tuesday Night

    Tuesday Night: A slight chance of showers. Partly cloudy, with a low around 83. Chance of precipitation is 10%.

    Low: 83 °F

    Slight Chance
    Showers

Detailed Forecast

Overnight
A slight chance of showers and thunderstorms. Partly cloudy, with a low around 84. Southeast wind 5 to 10 mph. Chance of precipitation is 10%.
Saturday
A slight chance of showers and thunderstorms. Mostly sunny, with a high near 88. Southeast wind around 5 mph. Chance of precipitation is 10%.
Saturday Night
Partly cloudy, with a low around 84. Calm wind becoming east around 5 mph after midnight.
Sunday
Mostly sunny, with a high near 88. Southeast wind around 5 mph becoming calm in the morning.
Sunday Night
Mostly clear, with a low around 84. Northwest wind around 5 mph becoming southeast after midnight.
Monday
Mostly sunny, with a high near 88.
Monday Night
Partly cloudy, with a low around 83.
Tuesday
Mostly sunny, with a high near 88.
Tuesday Night
A slight chance of showers. Partly cloudy, with a low around 83. Chance of precipitation is 10%.
Wednesday
Mostly sunny, with a high near 88.
Wednesday Night
A slight chance of showers and thunderstorms. Partly cloudy, with a low around 82. Chance of precipitation is 20%.
Thursday
Mostly sunny, with a high near 88.
Thursday Night
A slight chance of showers. Mostly clear, with a low around 83. Chance of precipitation is 10%.
Friday
A slight chance of showers. Sunny, with a high near 88. Chance of precipitation is 10%.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Marathon FL
 24.72°N 81.1°W (Elev. 0 ft)
Last Update:
12:15 am EDT Jun 20, 2026
Forecast Valid:
12am EDT Jun 20, 2026-6pm EDT Jun 26, 2026
 
Forecast Discussion
 
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Additional Resources

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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