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

Prolonged Atmospheric River Will Impact the Northwest Early this Week

A weather system in the Pacific Northwest will produce rain throughout the day, before a potent atmospheric river produces a prolonged round of heavy rainfall, widespread urban and river flooding, and high elevation snow to the region Monday through Wednesday. Showers and thunderstorms may produce isolated damaging winds, a brief tornado, and locally heavy rainfall across parts of Florida today. Read More >

Current conditions at

The Florida Keys - Marathon International Airport (KMTH)

Lat: 24.73°NLon: 81.05°WElev: 13ft.

Fair

81°F

27°C

Humidity 79%
Wind Speed SE 8 mph
Barometer 29.94 in (1013.8 mb)
Dewpoint 74°F (23°C)
Visibility 10.00 mi
Heat Index86°F (30°C)
Last update 7 Dec 3:53 pm EST
Extended Forecast for

Marathon Shores FL

  • This Afternoon

    This Afternoon: A slight chance of showers. Mostly sunny, with a high near 82. South wind around 5 mph. Chance of precipitation is 20%.

    High: 82 °F

    Slight Chance
    Showers

  • Tonight

    Tonight: A slight chance of showers, then a chance of showers and thunderstorms after 7pm. Mostly cloudy, with a low around 75. South wind 5 to 10 mph. Chance of precipitation is 40%.

    Low: 75 °F

    Chance
    Showers

  • Monday

    Monday: A chance of showers and thunderstorms. Partly sunny, with a high near 81. West wind 10 to 15 mph. Chance of precipitation is 40%.

    High: 81 °F

    Chance
    Showers

  • Monday Night

    Monday Night: A chance of showers. Mostly cloudy, with a low around 70. Northwest wind 10 to 15 mph becoming north after midnight. Chance of precipitation is 30%.

    Low: 70 °F

    Chance
    Showers

  • Tuesday

    Tuesday: A chance of showers. Mostly cloudy, with a high near 78. Northeast wind 10 to 15 mph. Chance of precipitation is 30%.

    High: 78 °F

    Chance
    Showers

  • Tuesday Night

    Tuesday Night: A chance of showers. Mostly cloudy, with a low around 71. Chance of precipitation is 30%.

    Low: 71 °F

    Chance
    Showers

  • Wednesday

    Wednesday: A slight chance of showers. Partly sunny, with a high near 78. Chance of precipitation is 20%.

    High: 78 °F

    Slight Chance
    Showers

  • Wednesday Night

    Wednesday Night: A slight chance of showers. Mostly cloudy, with a low around 69. Chance of precipitation is 20%.

    Low: 69 °F

    Slight Chance
    Showers

  • Thursday

    Thursday: A slight chance of showers. Mostly sunny, with a high near 78. Chance of precipitation is 10%.

    High: 78 °F

    Slight Chance
    Showers

Detailed Forecast

This Afternoon
A slight chance of showers. Mostly sunny, with a high near 82. South wind around 5 mph. Chance of precipitation is 20%.
Tonight
A slight chance of showers, then a chance of showers and thunderstorms after 7pm. Mostly cloudy, with a low around 75. South wind 5 to 10 mph. Chance of precipitation is 40%.
Monday
A chance of showers and thunderstorms. Partly sunny, with a high near 81. West wind 10 to 15 mph. Chance of precipitation is 40%.
Monday Night
A chance of showers. Mostly cloudy, with a low around 70. Northwest wind 10 to 15 mph becoming north after midnight. Chance of precipitation is 30%.
Tuesday
A chance of showers. Mostly cloudy, with a high near 78. Northeast wind 10 to 15 mph. Chance of precipitation is 30%.
Tuesday Night
A chance of showers. Mostly cloudy, with a low around 71. Chance of precipitation is 30%.
Wednesday
A slight chance of showers. Partly sunny, with a high near 78. Chance of precipitation is 20%.
Wednesday Night
A slight chance of showers. Mostly cloudy, with a low around 69. Chance of precipitation is 20%.
Thursday
A slight chance of showers. Mostly sunny, with a high near 78. Chance of precipitation is 10%.
Thursday Night
A slight chance of showers. Partly cloudy, with a low around 71. Chance of precipitation is 20%.
Friday
A slight chance of showers. Partly sunny, with a high near 79. Chance of precipitation is 20%.
Friday Night
A slight chance of showers. Mostly cloudy, with a low around 70. Chance of precipitation is 20%.
Saturday
A slight chance of showers. Partly sunny, with a high near 78. Chance of precipitation is 20%.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Marathon Shores FL
 24.74°N 81.04°W (Elev. 0 ft)
Last Update:
4:15 pm EST Dec 7, 2025
Forecast Valid:
4pm EST Dec 7, 2025-6pm EST Dec 13, 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