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

82°F

28°C

Humidity 79%
Wind Speed Calm
Barometer 30.05 in (1017.5 mb)
Dewpoint 75°F (24°C)
Visibility 10.00 mi
Heat Index89°F (32°C)
Last update 14 Jul 3:53 am EDT
Extended Forecast for

23 Miles NNW Long Key FL

  • Overnight

    Overnight: A 20 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 76. Calm wind.

    Low: 76 °F

    Slight Chance
    T-storms

  • Monday

    Monday: Showers and thunderstorms. High near 87. Calm wind becoming southwest 5 to 7 mph in the afternoon. Chance of precipitation is 80%. New rainfall amounts between a quarter and half of an inch possible.

    High: 87 °F

    Chance
    T-storms then
    T-storms

  • Monday Night

    Monday Night: Showers and thunderstorms, mainly before 5am. Low around 74. North wind around 5 mph becoming calm in the evening. Chance of precipitation is 80%. New rainfall amounts between a half and three quarters of an inch possible.

    Low: 74 °F

    T-storms

  • Tuesday

    Tuesday: Showers and thunderstorms likely before 7am, then showers and possibly a thunderstorm between 7am and 2pm, then showers and thunderstorms likely after 2pm. High near 84. South wind 5 to 8 mph. Chance of precipitation is 80%.

    High: 84 °F

    T-storms

  • Tuesday Night

    Tuesday Night: Showers likely and possibly a thunderstorm before 8pm, then a chance of showers and thunderstorms between 8pm and 2am, then showers likely and possibly a thunderstorm after 2am. Mostly cloudy, with a low around 76. Southeast wind 6 to 8 mph. Chance of precipitation is 60%.

    Low: 76 °F

    Showers
    Likely

  • Wednesday

    Wednesday: Showers and thunderstorms likely, mainly before 2pm. Mostly cloudy, with a high near 86. Southeast wind around 10 mph. Chance of precipitation is 70%.

    High: 86 °F

    T-storms
    Likely

  • Wednesday Night

    Wednesday Night: A 30 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 79. East wind 7 to 9 mph.

    Low: 79 °F

    Chance
    T-storms

  • Thursday

    Thursday: Showers and thunderstorms likely, mainly before 2pm. Partly sunny, with a high near 87. Southeast wind 10 to 14 mph, with gusts as high as 20 mph. Chance of precipitation is 60%.

    High: 87 °F

    T-storms
    Likely

  • Thursday Night

    Thursday Night: A 30 percent chance of showers and thunderstorms, mainly before 8pm. Partly cloudy, with a low around 79. East wind around 10 mph.

    Low: 79 °F

    Chance
    T-storms

Detailed Forecast

Overnight
A 20 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 76. Calm wind.
Monday
Showers and thunderstorms. High near 87. Calm wind becoming southwest 5 to 7 mph in the afternoon. Chance of precipitation is 80%. New rainfall amounts between a quarter and half of an inch possible.
Monday Night
Showers and thunderstorms, mainly before 5am. Low around 74. North wind around 5 mph becoming calm in the evening. Chance of precipitation is 80%. New rainfall amounts between a half and three quarters of an inch possible.
Tuesday
Showers and thunderstorms likely before 7am, then showers and possibly a thunderstorm between 7am and 2pm, then showers and thunderstorms likely after 2pm. High near 84. South wind 5 to 8 mph. Chance of precipitation is 80%.
Tuesday Night
Showers likely and possibly a thunderstorm before 8pm, then a chance of showers and thunderstorms between 8pm and 2am, then showers likely and possibly a thunderstorm after 2am. Mostly cloudy, with a low around 76. Southeast wind 6 to 8 mph. Chance of precipitation is 60%.
Wednesday
Showers and thunderstorms likely, mainly before 2pm. Mostly cloudy, with a high near 86. Southeast wind around 10 mph. Chance of precipitation is 70%.
Wednesday Night
A 30 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 79. East wind 7 to 9 mph.
Thursday
Showers and thunderstorms likely, mainly before 2pm. Partly sunny, with a high near 87. Southeast wind 10 to 14 mph, with gusts as high as 20 mph. Chance of precipitation is 60%.
Thursday Night
A 30 percent chance of showers and thunderstorms, mainly before 8pm. Partly cloudy, with a low around 79. East wind around 10 mph.
Friday
A 30 percent chance of showers and thunderstorms. Mostly sunny, with a high near 88.
Friday Night
A 20 percent chance of showers and thunderstorms. Partly cloudy, with a low around 79.
Saturday
A 30 percent chance of showers and thunderstorms. Mostly sunny, with a high near 88.
Saturday Night
A 20 percent chance of showers and thunderstorms. Partly cloudy, with a low around 78.
Sunday
A 30 percent chance of showers and thunderstorms. Mostly sunny, with a high near 88.
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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:
3:47 am EDT Jul 14, 2025
Forecast Valid:
4am EDT Jul 14, 2025-6pm EDT Jul 20, 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