National Oceanic and Atmospheric Administration National Weather Service United States Department of Commerce

Atmospheric River Bringing Heavy Rain to Southern California and Heavy Snow to the Sierra Nevadas

A strong atmospheric river will continue heavy rain over southern California through Friday. The heaviest rainfall is ongoing today in the Los Angeles Basin. Flash and urban flooding is possible. A prolonged heavy snowfall has begun over the Sierra Nevada Mountains and will continue through Friday. Travel will become increasingly difficult over the passes due to snow and strong winds. Read More >

Current conditions at

The Florida Keys - Marathon International Airport (KMTH)

Lat: 24.73°NLon: 81.05°WElev: 13ft.

Fair

72°F

22°C

Humidity 68%
Wind Speed NE 8 mph
Barometer 30.22 in (1023.2 mb)
Dewpoint 61°F (16°C)
Visibility 10.00 mi
Last update 24 Dec 9:53 pm EST
Extended Forecast for

Marathon FL

  • Tonight

    Tonight: Mostly clear, with a low around 69. Northeast wind 10 to 15 mph.

    Low: 69 °F

    Mostly Clear

  • Christmas Day

    Christmas Day: Sunny, with a high near 76. Northeast wind 5 to 10 mph.

    High: 76 °F

    Sunny

  • Thursday Night

    Thursday Night: Mostly clear, with a low around 69. North wind around 5 mph.

    Low: 69 °F

    Mostly Clear

  • Friday

    Friday: Sunny, with a high near 77. Northeast wind 5 to 10 mph.

    High: 77 °F

    Sunny

  • Friday Night

    Friday Night: Mostly clear, with a low around 69. North wind around 5 mph.

    Low: 69 °F

    Mostly Clear

  • Saturday

    Saturday: Sunny, with a high near 77.

    High: 77 °F

    Sunny

  • Saturday Night

    Saturday Night: Mostly clear, with a low around 69.

    Low: 69 °F

    Mostly Clear

  • Sunday

    Sunday: Sunny, with a high near 78.

    High: 78 °F

    Sunny

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 70.

    Low: 70 °F

    Mostly Clear

Detailed Forecast

Tonight
Mostly clear, with a low around 69. Northeast wind 10 to 15 mph.
Christmas Day
Sunny, with a high near 76. Northeast wind 5 to 10 mph.
Thursday Night
Mostly clear, with a low around 69. North wind around 5 mph.
Friday
Sunny, with a high near 77. Northeast wind 5 to 10 mph.
Friday Night
Mostly clear, with a low around 69. North wind around 5 mph.
Saturday
Sunny, with a high near 77.
Saturday Night
Mostly clear, with a low around 69.
Sunday
Sunny, with a high near 78.
Sunday Night
Mostly clear, with a low around 70.
Monday
Sunny, with a high near 77.
Monday Night
Mostly clear, with a low around 67.
Tuesday
A slight chance of showers. Sunny, with a high near 75. Chance of precipitation is 10%.
Tuesday Night
Partly cloudy, with a low around 60.
Wednesday
Mostly sunny, with a high near 72.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Marathon FL
 24.72°N 81.07°W (Elev. 7 ft)
Last Update:
10:15 pm EST Dec 24, 2025
Forecast Valid:
10pm EST Dec 24, 2025-6pm EST Dec 31, 2025
 
Forecast Discussion
 
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Additional Resources

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High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation