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

Late January Extreme Cold; Watching East Coast Storm Threat This Weekend

The next blast of Arctic air surges south down the Plains, across the Great Lakes and through the Southeast and East Friday through Saturday. This could be longest duration of cold in several decades. Forecast models are being closely monitored for potential of another significant winter storm to impact the eastern United States this coming weekend. Confidence in coastal impacts has increased. Read More >

Current conditions at

The Florida Keys - Marathon International Airport (KMTH)

Lat: 24.73°NLon: 81.05°WElev: 13ft.

N/A

Humidity NA
Wind Speed NA
Barometer NA
Dewpoint N/A
Visibility NA
Last update *** Not a current observation ***
Extended Forecast for

Marathon FL

  • Tonight

    Tonight: Partly cloudy, with a low around 58. North wind around 15 mph.

    Low: 58 °F

    Partly Cloudy

  • Wednesday

    Wednesday: Partly sunny, with a high near 68. North wind 10 to 15 mph.

    High: 68 °F

    Partly Sunny

  • Wednesday Night

    Wednesday Night: Mostly cloudy, with a low around 55. Breezy, with a north wind 15 to 20 mph.

    Low: 55 °F

    Mostly Cloudy
    then Mostly
    Cloudy and
    Breezy

  • Thursday

    Thursday: Mostly sunny, with a high near 70. North wind 10 to 15 mph.

    High: 70 °F

    Mostly Sunny

  • Thursday Night

    Thursday Night: A slight chance of showers. Mostly cloudy, with a low around 61. Northeast wind around 10 mph. Chance of precipitation is 20%.

    Low: 61 °F

    Slight Chance
    Showers

  • Friday

    Friday: A slight chance of showers. Mostly cloudy, with a high near 70. Chance of precipitation is 10%.

    High: 70 °F

    Slight Chance
    Showers

  • Friday Night

    Friday Night: A slight chance of showers. Mostly cloudy, with a low around 61. Chance of precipitation is 20%.

    Low: 61 °F

    Slight Chance
    Showers

  • Saturday

    Saturday: A slight chance of showers. Mostly cloudy, with a high near 67. Windy. Chance of precipitation is 20%.

    High: 67 °F

    Slight Chance
    Showers and
    Windy

  • Saturday Night

    Saturday Night: A slight chance of showers. Mostly cloudy, with a low around 47. Windy. Chance of precipitation is 10%.

    Low: 47 °F

    Slight Chance
    Showers and
    Windy

Detailed Forecast

Tonight
Partly cloudy, with a low around 58. North wind around 15 mph.
Wednesday
Partly sunny, with a high near 68. North wind 10 to 15 mph.
Wednesday Night
Mostly cloudy, with a low around 55. Breezy, with a north wind 15 to 20 mph.
Thursday
Mostly sunny, with a high near 70. North wind 10 to 15 mph.
Thursday Night
A slight chance of showers. Mostly cloudy, with a low around 61. Northeast wind around 10 mph. Chance of precipitation is 20%.
Friday
A slight chance of showers. Mostly cloudy, with a high near 70. Chance of precipitation is 10%.
Friday Night
A slight chance of showers. Mostly cloudy, with a low around 61. Chance of precipitation is 20%.
Saturday
A slight chance of showers. Mostly cloudy, with a high near 67. Windy. Chance of precipitation is 20%.
Saturday Night
A slight chance of showers. Mostly cloudy, with a low around 47. Windy. Chance of precipitation is 10%.
Sunday
Mostly sunny, with a high near 59. Breezy.
Sunday Night
Partly cloudy, with a low around 49.
Monday
Mostly sunny, with a high near 63.
Monday Night
Mostly clear, with a low around 53.
Tuesday
Sunny, with a high near 65.
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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:
9:15 pm EST Jan 27, 2026
Forecast Valid:
9pm EST Jan 27, 2026-6pm EST Feb 3, 2026
 
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