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

Snow Squalls May Impact the Northeast on Thursday; Dangerously Cold Arctic Air Impact the North-Central US

Snow showers and snow squalls are likely to develop across the Northeast on Thursday. Lake effect snow will persist downwind of the Great Lakes. An arctic blast will bring frigid temperatures, gusty winds and dangerous wind chills to the Northern Plains before expanding to the South and East. A major winter storm will begin impacting the Southern Plains and Lower Mississippi Valley Friday. Read More >

Hazardous Weather Conditions

Current conditions at

The Florida Keys - Marathon International Airport (KMTH)

Lat: 24.73°NLon: 81.05°WElev: 13ft.

Mostly Cloudy

N/A

Humidity NA
Wind Speed NE 8 mph
Barometer 30.15 in (1021.1 mb)
Dewpoint N/A
Visibility 10.00 mi
Last update 21 Jan 10:53 pm EST
Extended Forecast for

Marathon FL

  • Tonight

    Tonight: A chance of showers. Mostly cloudy, with a low around 69. Northeast wind around 10 mph. Chance of precipitation is 30%.

    Low: 69 °F

    Chance
    Showers

  • Thursday

    Thursday: A slight chance of showers. Partly sunny, with a high near 78. Northeast wind 5 to 10 mph. Chance of precipitation is 20%.

    High: 78 °F

    Slight Chance
    Showers

  • Thursday Night

    Thursday Night: A slight chance of showers. Partly cloudy, with a low around 68. Northeast wind around 5 mph. Chance of precipitation is 20%.

    Low: 68 °F

    Slight Chance
    Showers

  • Friday

    Friday: A slight chance of showers. Mostly sunny, with a high near 79. East wind around 5 mph. Chance of precipitation is 10%.

    High: 79 °F

    Slight Chance
    Showers

  • Friday Night

    Friday Night: Mostly clear, with a low around 70. Northeast wind around 5 mph.

    Low: 70 °F

    Mostly Clear

  • Saturday

    Saturday: Sunny, with a high near 80.

    High: 80 °F

    Sunny

  • Saturday Night

    Saturday Night: Mostly clear, with a low around 72.

    Low: 72 °F

    Mostly Clear

  • Sunday

    Sunday: Sunny, with a high near 81.

    High: 81 °F

    Sunny

  • Sunday Night

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

    Low: 70 °F

    Mostly Clear

Detailed Forecast

Tonight
A chance of showers. Mostly cloudy, with a low around 69. Northeast wind around 10 mph. Chance of precipitation is 30%.
Thursday
A slight chance of showers. Partly sunny, with a high near 78. Northeast wind 5 to 10 mph. Chance of precipitation is 20%.
Thursday Night
A slight chance of showers. Partly cloudy, with a low around 68. Northeast wind around 5 mph. Chance of precipitation is 20%.
Friday
A slight chance of showers. Mostly sunny, with a high near 79. East wind around 5 mph. Chance of precipitation is 10%.
Friday Night
Mostly clear, with a low around 70. Northeast wind around 5 mph.
Saturday
Sunny, with a high near 80.
Saturday Night
Mostly clear, with a low around 72.
Sunday
Sunny, with a high near 81.
Sunday Night
Mostly clear, with a low around 70.
Monday
A slight chance of showers. Sunny, with a high near 79. Chance of precipitation is 10%.
Monday Night
A slight chance of showers. Partly cloudy, with a low around 65. Chance of precipitation is 10%.
Tuesday
A slight chance of showers. Partly sunny, with a high near 75. Chance of precipitation is 10%.
Tuesday Night
A slight chance of showers. Partly cloudy, with a low around 63. Chance of precipitation is 10%.
Wednesday
A slight chance of showers. Partly sunny, with a high near 72. Chance of precipitation is 10%.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Marathon FL
 24.72°N 81.07°W (Elev. 7 ft)
Last Update:
11:15 pm EST Jan 21, 2026
Forecast Valid:
11pm EST Jan 21, 2026-6pm EST Jan 28, 2026
 
Forecast Discussion
 
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Additional Resources

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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