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

83°F

28°C

Humidity 72%
Wind Speed S 5 mph
Barometer 30.06 in (1017.9 mb)
Dewpoint 73°F (23°C)
Visibility 10.00 mi
Heat Index89°F (32°C)
Last update 24 May 12:53 am EDT
Extended Forecast for

23 Miles NNW Long Key FL

  • Overnight

    Overnight: Mostly clear, with a low around 76. East wind 3 to 5 mph.

    Low: 76 °F

    Mostly Clear

  • Saturday

    Saturday: A 30 percent chance of showers and thunderstorms, mainly after 2pm. Sunny, with a high near 88. Southeast wind 5 to 10 mph.

    High: 88 °F

    Sunny then
    Chance
    T-storms

  • Saturday Night

    Saturday Night: A 20 percent chance of showers and thunderstorms before 2am. Partly cloudy, with a low around 76. East wind 6 to 8 mph.

    Low: 76 °F

    Slight Chance
    T-storms

  • Sunday

    Sunday: A 40 percent chance of showers and thunderstorms, mainly after 8am. Mostly sunny, with a high near 89. Southeast wind around 11 mph.

    High: 89 °F

    Chance
    Showers then
    Chance
    T-storms

  • Sunday Night

    Sunday Night: A 30 percent chance of showers and thunderstorms. Mostly clear, with a low around 77. East wind around 9 mph.

    Low: 77 °F

    Chance
    T-storms

  • Memorial Day

    Memorial Day: A chance of showers, with thunderstorms also possible after 11am. Sunny, with a high near 88. Southeast wind 9 to 11 mph. Chance of precipitation is 30%.

    High: 88 °F

    Chance
    T-storms

  • Monday Night

    Monday Night: A 20 percent chance of showers and thunderstorms after 2am. Mostly clear, with a low around 78. East wind around 9 mph.

    Low: 78 °F

    Mostly Clear
    then Slight
    Chance
    T-storms

  • Tuesday

    Tuesday: A 30 percent chance of showers and thunderstorms, mainly after 2pm. Sunny, with a high near 88. Southeast wind 10 to 13 mph, with gusts as high as 18 mph.

    High: 88 °F

    Slight Chance
    T-storms then
    Chance
    Showers

  • Tuesday Night

    Tuesday Night: A chance of showers before 8pm, then a slight chance of showers and thunderstorms after 2am. Partly cloudy, with a low around 78. East wind around 10 mph. Chance of precipitation is 30%.

    Low: 78 °F

    Chance
    Showers then
    Slight Chance
    T-storms

Detailed Forecast

Overnight
Mostly clear, with a low around 76. East wind 3 to 5 mph.
Saturday
A 30 percent chance of showers and thunderstorms, mainly after 2pm. Sunny, with a high near 88. Southeast wind 5 to 10 mph.
Saturday Night
A 20 percent chance of showers and thunderstorms before 2am. Partly cloudy, with a low around 76. East wind 6 to 8 mph.
Sunday
A 40 percent chance of showers and thunderstorms, mainly after 8am. Mostly sunny, with a high near 89. Southeast wind around 11 mph.
Sunday Night
A 30 percent chance of showers and thunderstorms. Mostly clear, with a low around 77. East wind around 9 mph.
Memorial Day
A chance of showers, with thunderstorms also possible after 11am. Sunny, with a high near 88. Southeast wind 9 to 11 mph. Chance of precipitation is 30%.
Monday Night
A 20 percent chance of showers and thunderstorms after 2am. Mostly clear, with a low around 78. East wind around 9 mph.
Tuesday
A 30 percent chance of showers and thunderstorms, mainly after 2pm. Sunny, with a high near 88. Southeast wind 10 to 13 mph, with gusts as high as 18 mph.
Tuesday Night
A chance of showers before 8pm, then a slight chance of showers and thunderstorms after 2am. Partly cloudy, with a low around 78. East wind around 10 mph. Chance of precipitation is 30%.
Wednesday
A 30 percent chance of showers and thunderstorms, mainly after 2pm. Mostly sunny, with a high near 88.
Wednesday Night
A 30 percent chance of showers and thunderstorms. Partly cloudy, with a low around 77.
Thursday
A 30 percent chance of showers and thunderstorms. Mostly sunny, with a high near 88.
Thursday Night
A 30 percent chance of showers and thunderstorms. Partly cloudy, with a low around 76.
Friday
A 30 percent chance of showers and thunderstorms. Mostly sunny, with a high near 87.
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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:
1:17 am EDT May 24, 2025
Forecast Valid:
1am EDT May 24, 2025-6pm EDT May 30, 2025
 
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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