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 >

Hazardous Weather Conditions

Current conditions at

The Florida Keys - Marathon International Airport (KMTH)

Lat: 24.73°NLon: 81.05°WElev: 13ft.

Fair

82°F

28°C

Humidity 72%
Wind Speed E 8 mph
Barometer 30.04 in (1017.2 mb)
Dewpoint 72°F (22°C)
Visibility 10.00 mi
Heat Index87°F (31°C)
Last update 14 Mar 1:53 pm EDT
Extended Forecast for

Marathon Shores FL

  • This Afternoon

    This Afternoon: A chance of showers and thunderstorms. Mostly sunny, with a high near 82. Southeast wind around 10 mph. Chance of precipitation is 40%.

    High: 82 °F

    Chance
    Showers

  • Tonight

    Tonight: A chance of showers and thunderstorms. Partly cloudy, with a low around 76. East 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. 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: A chance of showers and thunderstorms. Cloudy, with a low around 62. Chance of precipitation is 50%.

    Low: 62 °F

    Chance
    Showers

  • Wednesday

    Wednesday: Showers likely and possibly a thunderstorm. Cloudy, with a high near 73. Breezy. Chance of precipitation is 60%.

    High: 73 °F

    Showers
    Likely and
    Breezy

Detailed Forecast

This Afternoon
A chance of showers and thunderstorms. Mostly sunny, with a high near 82. Southeast wind around 10 mph. Chance of precipitation is 40%.
Tonight
A chance of showers and thunderstorms. Partly cloudy, with a low around 76. East 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. 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
A chance of showers and thunderstorms. Cloudy, with a low around 62. Chance of precipitation is 50%.
Wednesday
Showers likely and possibly a thunderstorm. Cloudy, with a high near 73. Breezy. Chance of precipitation is 60%.
Wednesday Night
Showers likely and possibly a thunderstorm. Cloudy, with a low around 65. Breezy. Chance of precipitation is 60%.
Thursday
A chance of showers and thunderstorms. Mostly cloudy, with a high near 75. Breezy. Chance of precipitation is 40%.
Thursday Night
A chance of showers. Partly cloudy, with a low around 66. Chance of precipitation is 30%.
Friday
A slight chance of showers. Mostly sunny, with a high near 77. Chance of precipitation is 20%.
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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:
2:15 pm EDT Mar 14, 2026
Forecast Valid:
2pm EDT Mar 14, 2026-6pm EDT Mar 20, 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