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.

Mostly Cloudy

84°F

29°C

Humidity 77%
Wind Speed SW 12 G 21 mph
Barometer 29.87 in (1011.6 mb)
Dewpoint 76°F (24°C)
Visibility 10.00 mi
Heat Index93°F (34°C)
Last update 13 May 3:53 pm EDT
Extended Forecast for

23 Miles NNW Long Key FL

  • Tonight

    Tonight: A 40 percent chance of showers and thunderstorms, mainly between midnight and 5am. Mostly cloudy, with a low around 75. West wind 8 to 14 mph, with gusts as high as 20 mph.

    Low: 75 °F

    Slight Chance
    T-storms then
    Chance
    Showers

  • Thursday

    Thursday: A 30 percent chance of showers, mainly before 7am. Sunny, with a high near 87. West wind 8 to 13 mph.

    High: 87 °F

    Chance
    Showers then
    Sunny

  • Thursday Night

    Thursday Night: Mostly clear, with a low around 73. Northwest wind 6 to 9 mph.

    Low: 73 °F

    Mostly Clear

  • Friday

    Friday: A 20 percent chance of showers after 2pm. Sunny, with a high near 88. Light and variable wind becoming south 5 to 9 mph in the afternoon.

    High: 88 °F

    Sunny then
    Slight Chance
    Showers

  • Friday Night

    Friday Night: A 10 percent chance of showers before 8pm. Mostly clear, with a low around 75. Southwest wind around 5 mph becoming light and variable in the evening.

    Low: 75 °F

    Slight Chance
    Showers then
    Mostly Clear

  • Saturday

    Saturday: A slight chance of showers, with thunderstorms also possible after 2pm. Sunny, with a high near 89. Southeast wind 5 to 10 mph. Chance of precipitation is 20%.

    High: 89 °F

    Slight Chance
    Showers then
    Slight Chance
    T-storms

  • Saturday Night

    Saturday Night: A slight chance of thunderstorms before 8pm, then a chance of showers and thunderstorms after 2am. Partly cloudy, with a low around 79. East wind around 11 mph. Chance of precipitation is 40%.

    Low: 79 °F

    Slight Chance
    T-storms then
    Chance
    T-storms

  • Sunday

    Sunday: A 40 percent chance of showers and thunderstorms. Mostly sunny, with a high near 85. East wind 13 to 15 mph.

    High: 85 °F

    Chance
    T-storms

  • Sunday Night

    Sunday Night: A 40 percent chance of showers and thunderstorms, mainly after 2am. Partly cloudy, with a low around 79. East wind around 14 mph, with gusts as high as 18 mph.

    Low: 79 °F

    Chance
    T-storms

Detailed Forecast

Tonight
A 40 percent chance of showers and thunderstorms, mainly between midnight and 5am. Mostly cloudy, with a low around 75. West wind 8 to 14 mph, with gusts as high as 20 mph.
Thursday
A 30 percent chance of showers, mainly before 7am. Sunny, with a high near 87. West wind 8 to 13 mph.
Thursday Night
Mostly clear, with a low around 73. Northwest wind 6 to 9 mph.
Friday
A 20 percent chance of showers after 2pm. Sunny, with a high near 88. Light and variable wind becoming south 5 to 9 mph in the afternoon.
Friday Night
A 10 percent chance of showers before 8pm. Mostly clear, with a low around 75. Southwest wind around 5 mph becoming light and variable in the evening.
Saturday
A slight chance of showers, with thunderstorms also possible after 2pm. Sunny, with a high near 89. Southeast wind 5 to 10 mph. Chance of precipitation is 20%.
Saturday Night
A slight chance of thunderstorms before 8pm, then a chance of showers and thunderstorms after 2am. Partly cloudy, with a low around 79. East wind around 11 mph. Chance of precipitation is 40%.
Sunday
A 40 percent chance of showers and thunderstorms. Mostly sunny, with a high near 85. East wind 13 to 15 mph.
Sunday Night
A 40 percent chance of showers and thunderstorms, mainly after 2am. Partly cloudy, with a low around 79. East wind around 14 mph, with gusts as high as 18 mph.
Monday
A 40 percent chance of showers and thunderstorms. Mostly sunny, with a high near 86. Breezy.
Monday Night
A 30 percent chance of showers and thunderstorms. Partly cloudy, with a low around 78. Breezy.
Tuesday
A 30 percent chance of showers and thunderstorms. Sunny, with a high near 86. Breezy.
Tuesday Night
A 30 percent chance of showers and thunderstorms. Mostly clear, with a low around 78. Breezy.
Wednesday
A 30 percent chance of showers and thunderstorms. Sunny, with a high near 86.
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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:
3:57 pm EDT May 13, 2026
Forecast Valid:
4pm EDT May 13, 2026-6pm EDT May 20, 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