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

Tracking a Winter Storm; Unusual Early-Season Heat Wave in the Southwest

A major winter storm will organize across the Northern Plains today and then rapidly strengthen as it moves into the Great Lakes on Sunday. Heavy snow and blowing snow are likely to persist over the Great Lakes into Monday night. Dry and gusty winds will produce a critical fire risk across the central/southern Plains. An early heatwave will begin to intensify over the western U.S. into next week. Read More >

Current conditions at

The Florida Keys - Marathon International Airport (KMTH)

Lat: 24.73°NLon: 81.05°WElev: 13ft.

A Few Clouds

78°F

26°C

Humidity 85%
Wind Speed SE 6 mph
Barometer 30.04 in (1017.3 mb)
Dewpoint 73°F (23°C)
Visibility 10.00 mi
Heat Index80°F (27°C)
Last update 14 Mar 9:53 pm EDT
Extended Forecast for

Marathon Shores FL

  • Tonight

    Tonight: A chance of showers and thunderstorms. Mostly cloudy, with a low around 76. Southeast wind 10 to 15 mph. Chance of precipitation is 50%.

    Low: 76 °F

    Chance
    T-storms

  • Sunday

    Sunday: Showers likely and possibly a thunderstorm. Mostly cloudy, with a high near 81. Southeast wind around 15 mph. Chance of precipitation is 60%.

    High: 81 °F

    Showers
    Likely

  • Sunday Night

    Sunday Night: A chance of showers and thunderstorms. Mostly cloudy, with a low around 76. East wind around 15 mph. Chance of precipitation is 50%.

    Low: 76 °F

    Chance
    T-storms

  • Monday

    Monday: A chance of showers and thunderstorms. Mostly sunny, with a high near 82. South wind around 15 mph. Chance of precipitation is 50%.

    High: 82 °F

    Chance
    Showers

  • Monday Night

    Monday Night: Showers likely and possibly a thunderstorm. Mostly cloudy, with a low around 66. Southwest wind 10 to 15 mph. Chance of precipitation is 70%.

    Low: 66 °F

    Showers
    Likely

  • Tuesday

    Tuesday: A chance of showers and thunderstorms. Cloudy, with a high near 74. Chance of precipitation is 40%.

    High: 74 °F

    Chance
    Showers

  • Tuesday Night

    Tuesday Night: Showers likely and possibly a thunderstorm. Cloudy, with a low around 64. Chance of precipitation is 60%.

    Low: 64 °F

    Showers
    Likely

  • Wednesday

    Wednesday: Showers likely and possibly a thunderstorm. Cloudy, with a high near 74. Breezy. Chance of precipitation is 70%.

    High: 74 °F

    Showers
    Likely and
    Breezy

  • Wednesday Night

    Wednesday Night: Showers likely. Cloudy, with a low around 66. Chance of precipitation is 60%.

    Low: 66 °F

    Showers
    Likely

Detailed Forecast

Tonight
A chance of showers and thunderstorms. Mostly cloudy, with a low around 76. Southeast wind 10 to 15 mph. Chance of precipitation is 50%.
Sunday
Showers likely and possibly a thunderstorm. Mostly cloudy, with a high near 81. Southeast wind around 15 mph. Chance of precipitation is 60%.
Sunday Night
A chance of showers and thunderstorms. Mostly cloudy, with a low around 76. East wind around 15 mph. Chance of precipitation is 50%.
Monday
A chance of showers and thunderstorms. Mostly sunny, with a high near 82. South wind around 15 mph. Chance of precipitation is 50%.
Monday Night
Showers likely and possibly a thunderstorm. Mostly cloudy, with a low around 66. Southwest wind 10 to 15 mph. Chance of precipitation is 70%.
Tuesday
A chance of showers and thunderstorms. Cloudy, with a high near 74. Chance of precipitation is 40%.
Tuesday Night
Showers likely and possibly a thunderstorm. Cloudy, with a low around 64. Chance of precipitation is 60%.
Wednesday
Showers likely and possibly a thunderstorm. Cloudy, with a high near 74. Breezy. Chance of precipitation is 70%.
Wednesday Night
Showers likely. Cloudy, with a low around 66. Chance of precipitation is 60%.
Thursday
A chance of showers. Mostly cloudy, with a high near 76. Breezy. Chance of precipitation is 40%.
Thursday Night
A chance of showers. Mostly cloudy, with a low around 65. Chance of precipitation is 30%.
Friday
A slight chance of showers. Mostly sunny, with a high near 76. Chance of precipitation is 20%.
Friday Night
A slight chance of showers. Mostly clear, with a low around 66. Chance of precipitation is 10%.
Saturday
Sunny, with a high near 76.
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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:
10:15 pm EDT Mar 14, 2026
Forecast Valid:
10pm EDT Mar 14, 2026-6pm EDT Mar 21, 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