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

Strong to Severe Thunderstorms Continue Tonight in the East; Early Heat Wave in the West

Scattered strong to severe storms with damaging winds and potentially a tornado or two are expected tonight from the coastal Carolinas into the Mid-Atlantic states. An anomalously early heat wave will continue to intensify and expand across the West and Southwest as the week progresses. Numerous daily and potentially monthly record highs are expected to be broken. Read More >

Hazardous Weather Conditions

Current conditions at

The Florida Keys - Marathon International Airport (KMTH)

Lat: 24.73°NLon: 81.05°WElev: 13ft.

Light Rain

74°F

23°C

Humidity 88%
Wind Speed SE 6 mph
Barometer 29.95 in (1014.0 mb)
Dewpoint 70°F (21°C)
Visibility 9.00 mi
Last update 16 Mar 11:53 pm EDT
Extended Forecast for

Marathon Shores FL

  • Overnight

    Overnight: Showers and possibly a thunderstorm. Steady temperature around 75. Southwest wind 5 to 10 mph. Chance of precipitation is 80%.

    Low: 75 °F

    Showers

  • Tuesday

    Tuesday: A chance of showers and thunderstorms. Cloudy, with a high near 76. North wind 10 to 15 mph. Chance of precipitation is 40%.

    High: 76 °F

    Chance
    Showers

  • Tuesday Night

    Tuesday Night: A chance of showers and thunderstorms. Cloudy, with a low around 64. North wind around 15 mph. Chance of precipitation is 40%.

    Low: 64 °F

    Chance
    Showers

  • Wednesday

    Wednesday: A chance of showers and thunderstorms. Cloudy, with a high near 76. North wind around 15 mph. Chance of precipitation is 50%.

    High: 76 °F

    Chance
    Showers

  • Wednesday Night

    Wednesday Night: A chance of showers and thunderstorms. Cloudy, with a low around 67. Breezy, with a northeast wind 15 to 20 mph. Chance of precipitation is 50%.

    Low: 67 °F

    Chance
    Showers and
    Breezy

  • Thursday

    Thursday: A chance of showers and thunderstorms. Mostly cloudy, with a high near 76. Breezy. Chance of precipitation is 40%.

    High: 76 °F

    Chance
    Showers and
    Breezy

  • Thursday Night

    Thursday Night: A slight chance of showers. Partly cloudy, with a low around 66. Chance of precipitation is 10%.

    Low: 66 °F

    Slight Chance
    Showers

  • Friday

    Friday: Sunny, with a high near 76.

    High: 76 °F

    Sunny

  • Friday Night

    Friday Night: Mostly clear, with a low around 68.

    Low: 68 °F

    Mostly Clear

Detailed Forecast

Overnight
Showers and possibly a thunderstorm. Steady temperature around 75. Southwest wind 5 to 10 mph. Chance of precipitation is 80%.
Tuesday
A chance of showers and thunderstorms. Cloudy, with a high near 76. North wind 10 to 15 mph. Chance of precipitation is 40%.
Tuesday Night
A chance of showers and thunderstorms. Cloudy, with a low around 64. North wind around 15 mph. Chance of precipitation is 40%.
Wednesday
A chance of showers and thunderstorms. Cloudy, with a high near 76. North wind around 15 mph. Chance of precipitation is 50%.
Wednesday Night
A chance of showers and thunderstorms. Cloudy, with a low around 67. Breezy, with a northeast wind 15 to 20 mph. Chance of precipitation is 50%.
Thursday
A chance of showers and thunderstorms. Mostly cloudy, with a high near 76. Breezy. Chance of precipitation is 40%.
Thursday Night
A slight chance of showers. Partly cloudy, with a low around 66. Chance of precipitation is 10%.
Friday
Sunny, with a high near 76.
Friday Night
Mostly clear, with a low around 68.
Saturday
Sunny, with a high near 77.
Saturday Night
Mostly clear, with a low around 69.
Sunday
Sunny, with a high near 78.
Sunday Night
Mostly clear, with a low around 70.
Monday
Sunny, with a high near 78.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Marathon Shores FL
 24.74°N 81.04°W (Elev. 0 ft)
Last Update:
12:15 am EDT Mar 17, 2026
Forecast Valid:
12am EDT Mar 17, 2026-6pm EDT Mar 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