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

80°F

27°C

Humidity 85%
Wind Speed Calm
Barometer 30.00 in (1015.7 mb)
Dewpoint 75°F (24°C)
Visibility 10.00 mi
Heat Index85°F (29°C)
Last update 12 May 1:53 am EDT
Extended Forecast for

Marathon FLSimilar City Names

  • Overnight

    Overnight: Partly cloudy, with a low around 80. East wind around 10 mph.

    Low: 80 °F

    Partly Cloudy

  • Tuesday

    Tuesday: Mostly sunny, with a high near 88. Southeast wind 5 to 10 mph.

    High: 88 °F

    Mostly Sunny

  • Tuesday Night

    Tuesday Night: A chance of showers and thunderstorms. Mostly cloudy, with a low around 79. Calm wind. Chance of precipitation is 30%.

    Low: 79 °F

    Chance
    Showers

  • Wednesday

    Wednesday: A slight chance of showers and thunderstorms. Mostly cloudy, with a high near 88. Southwest wind 5 to 10 mph. Chance of precipitation is 10%.

    High: 88 °F

    Slight Chance
    T-storms

  • Wednesday Night

    Wednesday Night: A chance of showers and thunderstorms. Mostly cloudy, with a low around 79. West wind around 15 mph. Chance of precipitation is 30%.

    Low: 79 °F

    Chance
    Showers

  • Thursday

    Thursday: A slight chance of showers and thunderstorms. Mostly sunny, with a high near 87. Chance of precipitation is 10%.

    High: 87 °F

    Slight Chance
    T-storms

  • Thursday Night

    Thursday Night: Mostly clear, with a low around 79.

    Low: 79 °F

    Mostly Clear

  • Friday

    Friday: Sunny, with a high near 87.

    High: 87 °F

    Sunny

  • Friday Night

    Friday Night: A slight chance of showers. Mostly clear, with a low around 80. Chance of precipitation is 20%.

    Low: 80 °F

    Slight Chance
    Showers

Detailed Forecast

Overnight
Partly cloudy, with a low around 80. East wind around 10 mph.
Tuesday
Mostly sunny, with a high near 88. Southeast wind 5 to 10 mph.
Tuesday Night
A chance of showers and thunderstorms. Mostly cloudy, with a low around 79. Calm wind. Chance of precipitation is 30%.
Wednesday
A slight chance of showers and thunderstorms. Mostly cloudy, with a high near 88. Southwest wind 5 to 10 mph. Chance of precipitation is 10%.
Wednesday Night
A chance of showers and thunderstorms. Mostly cloudy, with a low around 79. West wind around 15 mph. Chance of precipitation is 30%.
Thursday
A slight chance of showers and thunderstorms. Mostly sunny, with a high near 87. Chance of precipitation is 10%.
Thursday Night
Mostly clear, with a low around 79.
Friday
Sunny, with a high near 87.
Friday Night
A slight chance of showers. Mostly clear, with a low around 80. Chance of precipitation is 20%.
Saturday
Sunny, with a high near 88.
Saturday Night
A slight chance of showers and thunderstorms. Partly cloudy, with a low around 80. Chance of precipitation is 20%.
Sunday
A slight chance of showers and thunderstorms. Sunny, with a high near 88. Chance of precipitation is 10%.
Sunday Night
A slight chance of showers. Partly cloudy, with a low around 81. Chance of precipitation is 10%.
Monday
A slight chance of showers. Mostly sunny, with a high near 88. Chance of precipitation is 10%.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Marathon FLSimilar City Names
 24.72°N 81.07°W (Elev. 7 ft)
Last Update:
2:15 am EDT May 12, 2026
Forecast Valid:
2am EDT May 12, 2026-6pm EDT May 18, 2026
 
Forecast Discussion
 
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Additional Resources

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Chance of Precipitation