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.

A Few Clouds

87°F

31°C

Humidity 67%
Wind Speed E 9 mph
Barometer 30.02 in (1016.6 mb)
Dewpoint 75°F (24°C)
Visibility 10.00 mi
Heat Index96°F (36°C)
Last update 24 Jun 6:53 pm EDT
Extended Forecast for

23 Miles NNW Long Key FL

  • Tonight

    Tonight: A slight chance of showers and thunderstorms between 7pm and 11pm. Mostly cloudy, then gradually becoming mostly clear, with a low around 79. East wind 3 to 6 mph. Chance of precipitation is 20%.

    Low: 79 °F

    Slight Chance
    T-storms then
    Mostly Clear

  • Thursday

    Thursday: A 40 percent chance of showers and thunderstorms, mainly between 1pm and 5pm. Mostly sunny, with a high near 90. Heat index values as high as 100. Southeast wind 6 to 10 mph.

    High: 90 °F

    Chance
    T-storms

  • Thursday Night

    Thursday Night: A 30 percent chance of showers and thunderstorms, mainly between 4am and 5am. Partly cloudy, with a low around 80. East wind around 8 mph.

    Low: 80 °F

    Partly Cloudy
    then Chance
    Showers

  • Friday

    Friday: A 30 percent chance of showers and thunderstorms, mainly after 7am. Sunny, with a high near 90. Heat index values as high as 102. Southeast wind 9 to 11 mph.

    High: 90 °F

    Chance
    T-storms

  • Friday Night

    Friday Night: A 20 percent chance of showers and thunderstorms. Mostly clear, with a low around 79. East wind 7 to 9 mph.

    Low: 79 °F

    Slight Chance
    T-storms

  • Saturday

    Saturday: A 30 percent chance of showers and thunderstorms. Sunny, with a high near 90. East wind 7 to 10 mph.

    High: 90 °F

    Chance
    T-storms

  • Saturday Night

    Saturday Night: Mostly clear, with a low around 78. East wind around 10 mph.

    Low: 78 °F

    Mostly Clear

  • Sunday

    Sunday: A 30 percent chance of showers and thunderstorms, mainly after 2pm. Sunny, with a high near 90. East wind 8 to 13 mph.

    High: 90 °F

    Chance
    T-storms

  • Sunday Night

    Sunday Night: A 30 percent chance of showers and thunderstorms before 8pm. Mostly clear, with a low around 78. East wind around 10 mph.

    Low: 78 °F

    Chance
    T-storms then
    Mostly Clear

Detailed Forecast

Tonight
A slight chance of showers and thunderstorms between 7pm and 11pm. Mostly cloudy, then gradually becoming mostly clear, with a low around 79. East wind 3 to 6 mph. Chance of precipitation is 20%.
Thursday
A 40 percent chance of showers and thunderstorms, mainly between 1pm and 5pm. Mostly sunny, with a high near 90. Heat index values as high as 100. Southeast wind 6 to 10 mph.
Thursday Night
A 30 percent chance of showers and thunderstorms, mainly between 4am and 5am. Partly cloudy, with a low around 80. East wind around 8 mph.
Friday
A 30 percent chance of showers and thunderstorms, mainly after 7am. Sunny, with a high near 90. Heat index values as high as 102. Southeast wind 9 to 11 mph.
Friday Night
A 20 percent chance of showers and thunderstorms. Mostly clear, with a low around 79. East wind 7 to 9 mph.
Saturday
A 30 percent chance of showers and thunderstorms. Sunny, with a high near 90. East wind 7 to 10 mph.
Saturday Night
Mostly clear, with a low around 78. East wind around 10 mph.
Sunday
A 30 percent chance of showers and thunderstorms, mainly after 2pm. Sunny, with a high near 90. East wind 8 to 13 mph.
Sunday Night
A 30 percent chance of showers and thunderstorms before 8pm. Mostly clear, with a low around 78. East wind around 10 mph.
Monday
A 30 percent chance of showers and thunderstorms after 2pm. Sunny, with a high near 90.
Monday Night
A 30 percent chance of showers and thunderstorms. Mostly clear, with a low around 78.
Tuesday
A 40 percent chance of showers and thunderstorms. Sunny, with a high near 90.
Tuesday Night
A 30 percent chance of showers and thunderstorms. Mostly clear, with a low around 77.
Wednesday
A 40 percent chance of showers and thunderstorms. Sunny, with a high near 90.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
23 Miles NNW Long Key FL
 25.14°N 80.92°W
Last Update:
4:31 pm EDT Jun 24, 2026
Forecast Valid:
6pm EDT Jun 24, 2026-6pm EDT Jul 1, 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