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

86°F

30°C

Humidity 77%
Wind Speed SE 7 mph
Barometer 30.02 in (1016.5 mb)
Dewpoint 78°F (26°C)
Visibility 10.00 mi
Heat Index98°F (37°C)
Last update 18 Jun 4:53 pm EDT
Extended Forecast for

Marathon Shores FL

  • Tonight

    Tonight: A slight chance of showers and thunderstorms after 8pm. Mostly cloudy, with a low around 84. Southeast wind 5 to 10 mph. Chance of precipitation is 10%.

    Low: 84 °F

    Slight Chance
    T-storms

  • Juneteenth

    Juneteenth: A slight chance of showers and thunderstorms before 2pm. Mostly sunny, with a high near 88. Southeast wind around 5 mph. Chance of precipitation is 10%.

    High: 88 °F

    Slight Chance
    T-storms

  • Friday Night

    Friday Night: A slight chance of showers and thunderstorms after 8pm. Partly cloudy, with a low around 84. Southeast wind around 5 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 82. Southeast wind around 5 mph becoming northeast in the evening.

    Low: 82 °F

    Partly Cloudy

  • Sunday

    Sunday: Mostly sunny, with a high near 88.

    High: 88 °F

    Mostly Sunny

  • Sunday Night

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

    Low: 83 °F

    Mostly Clear

  • Monday

    Monday: Sunny, with a high near 89.

    High: 89 °F

    Sunny

  • Monday Night

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

    Low: 83 °F

    Partly Cloudy

Detailed Forecast

Tonight
A slight chance of showers and thunderstorms after 8pm. Mostly cloudy, with a low around 84. Southeast wind 5 to 10 mph. Chance of precipitation is 10%.
Juneteenth
A slight chance of showers and thunderstorms before 2pm. Mostly sunny, with a high near 88. Southeast wind around 5 mph. Chance of precipitation is 10%.
Friday Night
A slight chance of showers and thunderstorms after 8pm. Partly cloudy, with a low around 84. Southeast wind around 5 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 82. Southeast wind around 5 mph becoming northeast in the evening.
Sunday
Mostly sunny, with a high near 88.
Sunday Night
Mostly clear, with a low around 83.
Monday
Sunny, with a high near 89.
Monday Night
Partly cloudy, with a low around 83.
Tuesday
Sunny, with a high near 89.
Tuesday Night
A slight chance of showers. Mostly clear, with a low around 83. Chance of precipitation is 10%.
Wednesday
Mostly sunny, with a high near 89.
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 89.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Marathon Shores FL
 24.72°N 81.05°W (Elev. 0 ft)
Last Update:
5:15 pm EDT Jun 18, 2026
Forecast Valid:
5pm EDT Jun 18, 2026-6pm EDT Jun 25, 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