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

Tracking Winter Weather and Frigid Temperatures Through This Weekend

A clipper storm will move across the Great Lakes through this weekend with periods of light snow, gusty winds, and lake effect snow bands which could make for hazardous travel at times. A frigid airmass will spread eastward behind this storm into the Midwest and Eastern U.S. through the weekend. Read More >

Current conditions at

The Florida Keys - Marathon International Airport (KMTH)

Lat: 24.73°NLon: 81.05°WElev: 13ft.

A Few Clouds

75°F

24°C

Humidity 66%
Wind Speed NE 6 mph
Barometer 30.06 in (1017.7 mb)
Dewpoint 63°F (17°C)
Visibility 10.00 mi
Last update 17 Jan 2:53 pm EST
Extended Forecast for

Marathon FL

  • This Afternoon

    This Afternoon: A slight chance of showers. Mostly sunny, with a high near 75. Northeast wind around 5 mph. Chance of precipitation is 10%.

    High: 75 °F

    Slight Chance
    Showers

  • Tonight

    Tonight: A slight chance of showers. Mostly cloudy, with a low around 67. Northeast wind around 5 mph. Chance of precipitation is 20%.

    Low: 67 °F

    Slight Chance
    Showers

  • Sunday

    Sunday: A chance of showers. Mostly cloudy, with a high near 74. Breezy, with a north wind 5 to 10 mph increasing to 15 to 20 mph in the afternoon. Chance of precipitation is 40%.

    High: 74 °F

    Chance
    Showers and
    Breezy

  • Sunday Night

    Sunday Night: Mostly cloudy, with a low around 56. North wind around 15 mph.

    Low: 56 °F

    Mostly Cloudy

  • M.L.King Day

    M.L.King Day: Mostly sunny, with a high near 65. North wind around 15 mph.

    High: 65 °F

    Mostly Sunny

  • Monday Night

    Monday Night: Mostly cloudy, with a low around 59.

    Low: 59 °F

    Mostly Cloudy

  • Tuesday

    Tuesday: Mostly sunny, with a high near 71. Breezy.

    High: 71 °F

    Mostly Sunny
    and Breezy

  • Tuesday Night

    Tuesday Night: Partly cloudy, with a low around 65. Breezy.

    Low: 65 °F

    Partly Cloudy
    and Breezy

  • Wednesday

    Wednesday: A slight chance of showers. Partly sunny, with a high near 76. Breezy. Chance of precipitation is 10%.

    High: 76 °F

    Slight Chance
    Showers and
    Breezy

Detailed Forecast

This Afternoon
A slight chance of showers. Mostly sunny, with a high near 75. Northeast wind around 5 mph. Chance of precipitation is 10%.
Tonight
A slight chance of showers. Mostly cloudy, with a low around 67. Northeast wind around 5 mph. Chance of precipitation is 20%.
Sunday
A chance of showers. Mostly cloudy, with a high near 74. Breezy, with a north wind 5 to 10 mph increasing to 15 to 20 mph in the afternoon. Chance of precipitation is 40%.
Sunday Night
Mostly cloudy, with a low around 56. North wind around 15 mph.
M.L.King Day
Mostly sunny, with a high near 65. North wind around 15 mph.
Monday Night
Mostly cloudy, with a low around 59.
Tuesday
Mostly sunny, with a high near 71. Breezy.
Tuesday Night
Partly cloudy, with a low around 65. Breezy.
Wednesday
A slight chance of showers. Partly sunny, with a high near 76. Breezy. Chance of precipitation is 10%.
Wednesday Night
A slight chance of showers. Mostly cloudy, with a low around 70. Chance of precipitation is 20%.
Thursday
A chance of showers. Partly sunny, with a high near 79. Chance of precipitation is 30%.
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. Sunny, with a high near 79. Chance of precipitation is 20%.
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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:
3:15 pm EST Jan 17, 2026
Forecast Valid:
3pm EST Jan 17, 2026-6pm EST Jan 23, 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