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

Atmospheric River to Begin to Impact the Northwest U.S.; Gusty Winds in the Northeast U.S.

A strong atmospheric river moving into northern California later Tuesday will bring a threat for moderate to heavy rainfall and flooding, gusty to high winds, and mountain snows for parts of the Northwest U.S. through at least Wednesday. Gusty winds and isolated rain and snow showers will continue in the Northeast U.S. Tuesday behind a cold front. Read More >

Current conditions at

The Florida Keys - Marathon International Airport (KMTH)

Lat: 24.73°NLon: 81.05°WElev: 13ft.

Fair

76°F

24°C

Humidity 85%
Wind Speed NE 9 G 21 mph
Barometer 30.13 in (1020.1 mb)
Dewpoint 71°F (22°C)
Visibility 10.00 mi
Heat Index77°F (25°C)
Last update 3 Nov 10:53 pm EST
Extended Forecast for

Long Key FL

  • Tonight

    Tonight: A slight chance of showers. Mostly cloudy, with a low around 74. Northeast wind around 15 mph. Chance of precipitation is 10%.

    Low: 74 °F

    Slight Chance
    Showers

  • Tuesday

    Tuesday: Mostly cloudy, with a high near 79. Northeast wind around 15 mph.

    High: 79 °F

    Mostly Cloudy

  • Tuesday Night

    Tuesday Night: Mostly cloudy, with a low around 72. Northeast wind around 15 mph.

    Low: 72 °F

    Mostly Cloudy

  • Wednesday

    Wednesday: Mostly cloudy, with a high near 80. East wind 10 to 15 mph.

    High: 80 °F

    Mostly Cloudy

  • Wednesday Night

    Wednesday Night: A slight chance of showers. Mostly cloudy, with a low around 75. Northeast wind around 10 mph. Chance of precipitation is 10%.

    Low: 75 °F

    Slight Chance
    Showers

  • Thursday

    Thursday: A slight chance of showers. Partly sunny, with a high near 82. Chance of precipitation is 20%.

    High: 82 °F

    Slight Chance
    Showers

  • Thursday Night

    Thursday Night: A chance of showers. Mostly cloudy, with a low around 75. Chance of precipitation is 30%.

    Low: 75 °F

    Chance
    Showers

  • Friday

    Friday: A chance of showers. Mostly cloudy, with a high near 82. Chance of precipitation is 30%.

    High: 82 °F

    Chance
    Showers

  • Friday Night

    Friday Night: A chance of showers. Mostly cloudy, with a low around 75. Chance of precipitation is 30%.

    Low: 75 °F

    Chance
    Showers

Detailed Forecast

Tonight
A slight chance of showers. Mostly cloudy, with a low around 74. Northeast wind around 15 mph. Chance of precipitation is 10%.
Tuesday
Mostly cloudy, with a high near 79. Northeast wind around 15 mph.
Tuesday Night
Mostly cloudy, with a low around 72. Northeast wind around 15 mph.
Wednesday
Mostly cloudy, with a high near 80. East wind 10 to 15 mph.
Wednesday Night
A slight chance of showers. Mostly cloudy, with a low around 75. Northeast wind around 10 mph. Chance of precipitation is 10%.
Thursday
A slight chance of showers. Partly sunny, with a high near 82. Chance of precipitation is 20%.
Thursday Night
A chance of showers. Mostly cloudy, with a low around 75. Chance of precipitation is 30%.
Friday
A chance of showers. Mostly cloudy, with a high near 82. Chance of precipitation is 30%.
Friday Night
A chance of showers. Mostly cloudy, with a low around 75. Chance of precipitation is 30%.
Saturday
A chance of showers. Mostly sunny, with a high near 83. Chance of precipitation is 30%.
Saturday Night
A slight chance of showers. Mostly clear, with a low around 75. Chance of precipitation is 20%.
Sunday
A slight chance of showers. Sunny, with a high near 83. Chance of precipitation is 20%.
Sunday Night
A slight chance of showers. Partly cloudy, with a low around 75. Chance of precipitation is 20%.
Monday
Mostly sunny, with a high near 80.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Long Key FL
 24.83°N 80.81°W (Elev. 0 ft)
Last Update:
11:15 pm EST Nov 3, 2025
Forecast Valid:
11pm EST Nov 3, 2025-6pm EST Nov 10, 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