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

81°F

27°C

Humidity 88%
Wind Speed NE 5 mph
Barometer 29.98 in (1015.3 mb)
Dewpoint 77°F (25°C)
Visibility 10.00 mi
Heat Index88°F (31°C)
Last update 16 Aug 10:53 pm EDT
Extended Forecast for

23 Miles NNW Long Key FL

  • Tonight

    Tonight: A slight chance of showers and thunderstorms between 1am and 2am. Partly cloudy, with a low around 78. North wind around 5 mph becoming calm after midnight. Chance of precipitation is 20%.

    Low: 78 °F

    Slight Chance
    T-storms

  • Sunday

    Sunday: A 30 percent chance of showers and thunderstorms, mainly after 2pm. Sunny, with a high near 88. Calm wind becoming south around 6 mph in the afternoon.

    High: 88 °F

    Sunny then
    Chance
    T-storms

  • Sunday Night

    Sunday Night: A 20 percent chance of showers and thunderstorms before 2am. Mostly clear, with a low around 78. Calm wind.

    Low: 78 °F

    Slight Chance
    T-storms

  • Monday

    Monday: A 30 percent chance of showers and thunderstorms after 2pm. Sunny, with a high near 89. Calm wind becoming southwest around 6 mph in the afternoon.

    High: 89 °F

    Sunny then
    Chance
    T-storms

  • Monday Night

    Monday Night: A 30 percent chance of showers and thunderstorms before 2am. Mostly clear, with a low around 78. Northwest wind 3 to 6 mph.

    Low: 78 °F

    Chance
    T-storms

  • Tuesday

    Tuesday: A 50 percent chance of showers and thunderstorms, mainly after 2pm. Sunny, with a high near 90. West wind 6 to 11 mph.

    High: 90 °F

    Slight Chance
    T-storms then
    Chance
    T-storms

  • Tuesday Night

    Tuesday Night: A 30 percent chance of showers and thunderstorms, mainly before 2am. Mostly clear, with a low around 78. Northwest wind 6 to 9 mph.

    Low: 78 °F

    Chance
    T-storms

  • Wednesday

    Wednesday: A 30 percent chance of showers and thunderstorms, mainly after 2pm. Sunny, with a high near 90. West wind 6 to 13 mph.

    High: 90 °F

    Chance
    T-storms

  • Wednesday Night

    Wednesday Night: A 30 percent chance of showers and thunderstorms, mainly before 8pm. Mostly clear, with a low around 79. West wind 6 to 9 mph.

    Low: 79 °F

    Chance
    T-storms

Detailed Forecast

Tonight
A slight chance of showers and thunderstorms between 1am and 2am. Partly cloudy, with a low around 78. North wind around 5 mph becoming calm after midnight. Chance of precipitation is 20%.
Sunday
A 30 percent chance of showers and thunderstorms, mainly after 2pm. Sunny, with a high near 88. Calm wind becoming south around 6 mph in the afternoon.
Sunday Night
A 20 percent chance of showers and thunderstorms before 2am. Mostly clear, with a low around 78. Calm wind.
Monday
A 30 percent chance of showers and thunderstorms after 2pm. Sunny, with a high near 89. Calm wind becoming southwest around 6 mph in the afternoon.
Monday Night
A 30 percent chance of showers and thunderstorms before 2am. Mostly clear, with a low around 78. Northwest wind 3 to 6 mph.
Tuesday
A 50 percent chance of showers and thunderstorms, mainly after 2pm. Sunny, with a high near 90. West wind 6 to 11 mph.
Tuesday Night
A 30 percent chance of showers and thunderstorms, mainly before 2am. Mostly clear, with a low around 78. Northwest wind 6 to 9 mph.
Wednesday
A 30 percent chance of showers and thunderstorms, mainly after 2pm. Sunny, with a high near 90. West wind 6 to 13 mph.
Wednesday Night
A 30 percent chance of showers and thunderstorms, mainly before 8pm. Mostly clear, with a low around 79. West wind 6 to 9 mph.
Thursday
A 30 percent chance of showers and thunderstorms. Sunny, with a high near 89.
Thursday Night
A 20 percent chance of showers and thunderstorms. Mostly clear, with a low around 78.
Friday
A 30 percent chance of showers and thunderstorms. Mostly sunny, with a high near 89.
Friday Night
A 20 percent chance of showers and thunderstorms. Partly cloudy, with a low around 78.
Saturday
A 30 percent chance of showers and thunderstorms. Mostly sunny, with a high near 89.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
23 Miles NNW Long Key FL
 25.14°N 80.92°W
Last Update:
11:31 pm EDT Aug 16, 2025
Forecast Valid:
11pm EDT Aug 16, 2025-6pm EDT Aug 23, 2025
 
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