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.

Overcast

83°F

28°C

Humidity 74%
Wind Speed NE 5 mph
Barometer 29.89 in (1012.1 mb)
Dewpoint 74°F (23°C)
Visibility 10.00 mi
Heat Index90°F (32°C)
Last update 18 Sep 5:53 pm EDT
Extended Forecast for

5 Miles WSW Long Key FL

  • Tonight

    Tonight: Showers likely and possibly a thunderstorm before 8pm, then a chance of showers and thunderstorms after 8pm. Mostly cloudy, with a low around 79. Northeast wind around 10 mph. Chance of precipitation is 70%.

    Low: 79 °F

    Showers
    Likely

  • Friday

    Friday: A chance of showers and thunderstorms. Mostly sunny, with a high near 86. Northeast wind around 5 mph. Chance of precipitation is 40%.

    High: 86 °F

    Chance
    Showers

  • Friday Night

    Friday Night: A chance of showers and thunderstorms. Partly cloudy, with a low around 80. Northeast wind 5 to 10 mph. Chance of precipitation is 40%.

    Low: 80 °F

    Chance
    Showers

  • Saturday

    Saturday: A chance of showers and thunderstorms. Mostly sunny, with a high near 86. Northeast wind 5 to 10 mph. Chance of precipitation is 40%.

    High: 86 °F

    Chance
    Showers

  • Saturday Night

    Saturday Night: A chance of showers and thunderstorms. Partly cloudy, with a low around 80. Northeast wind 5 to 10 mph. Chance of precipitation is 40%.

    Low: 80 °F

    Chance
    Showers

  • Sunday

    Sunday: A chance of showers and thunderstorms. Mostly sunny, with a high near 86. Chance of precipitation is 40%.

    High: 86 °F

    Chance
    Showers

  • Sunday Night

    Sunday Night: A chance of showers and thunderstorms. Partly cloudy, with a low around 80. Chance of precipitation is 40%.

    Low: 80 °F

    Chance
    Showers

  • Monday

    Monday: A chance of showers and thunderstorms. Mostly sunny, with a high near 87. Chance of precipitation is 30%.

    High: 87 °F

    Chance
    Showers

  • Monday Night

    Monday Night: A chance of showers and thunderstorms. Partly cloudy, with a low around 81. Chance of precipitation is 30%.

    Low: 81 °F

    Chance
    Showers

Detailed Forecast

Tonight
Showers likely and possibly a thunderstorm before 8pm, then a chance of showers and thunderstorms after 8pm. Mostly cloudy, with a low around 79. Northeast wind around 10 mph. Chance of precipitation is 70%.
Friday
A chance of showers and thunderstorms. Mostly sunny, with a high near 86. Northeast wind around 5 mph. Chance of precipitation is 40%.
Friday Night
A chance of showers and thunderstorms. Partly cloudy, with a low around 80. Northeast wind 5 to 10 mph. Chance of precipitation is 40%.
Saturday
A chance of showers and thunderstorms. Mostly sunny, with a high near 86. Northeast wind 5 to 10 mph. Chance of precipitation is 40%.
Saturday Night
A chance of showers and thunderstorms. Partly cloudy, with a low around 80. Northeast wind 5 to 10 mph. Chance of precipitation is 40%.
Sunday
A chance of showers and thunderstorms. Mostly sunny, with a high near 86. Chance of precipitation is 40%.
Sunday Night
A chance of showers and thunderstorms. Partly cloudy, with a low around 80. Chance of precipitation is 40%.
Monday
A chance of showers and thunderstorms. Mostly sunny, with a high near 87. Chance of precipitation is 30%.
Monday Night
A chance of showers and thunderstorms. Partly cloudy, with a low around 81. Chance of precipitation is 30%.
Tuesday
A chance of showers and thunderstorms. Mostly sunny, with a high near 87. Chance of precipitation is 30%.
Tuesday Night
A chance of showers and thunderstorms. Partly cloudy, with a low around 82. Chance of precipitation is 30%.
Wednesday
A chance of showers and thunderstorms. Mostly sunny, with a high near 87. Chance of precipitation is 30%.
Wednesday Night
A chance of showers and thunderstorms. Mostly clear, with a low around 82. Chance of precipitation is 30%.
Thursday
A chance of showers and thunderstorms. Sunny, with a high near 87. Chance of precipitation is 30%.
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ABOUT THIS FORECAST

 
Point Forecast:
5 Miles WSW Long Key FL
 24.79°N 80.89°W (Elev. 0 ft)
Last Update:
5:15 pm EDT Sep 18, 2025
Forecast Valid:
6pm EDT Sep 18, 2025-6pm EDT Sep 25, 2025
 
Forecast Discussion
 
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Additional Resources

Radar & Satellite Image

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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