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

Severe Weather and Heavy Rain from the Great Lakes to the Mid-Atlantic; Heat Persists in the East

Widespread strong thunderstorms with damaging winds and locally heavy rain are expected from the Upper Ohio Valley into the southern Mid-Atlantic today and portions of the central Appalachians and Carolinas on Saturday. Monsoonal moisture will bring a flash flooding threat to the Desert Southwest. Sweltering heat persists from the Plains to the southern Mid-Atlantic through tonight. Read More >

Hazardous Weather Conditions

Current conditions at

The Florida Keys - Marathon International Airport (KMTH)

Lat: 24.73°NLon: 81.05°WElev: 13ft.

Fair

86°F

30°C

Humidity 77%
Wind Speed S 5 mph
Barometer 29.97 in (1014.8 mb)
Dewpoint 78°F (26°C)
Visibility 10.00 mi
Heat Index98°F (37°C)
Last update 4 Sep 7:53 am EDT
Extended Forecast for

Islamorada FL

  • Today

    Today: A chance of showers and thunderstorms. Partly sunny, with a high near 88. Southeast wind around 5 mph. Chance of precipitation is 50%.

    High: 88 °F

    Chance
    T-storms

  • Tonight

    Tonight: A chance of showers and thunderstorms. Partly cloudy, with a low around 83. East wind around 5 mph. Chance of precipitation is 50%.

    Low: 83 °F

    Chance
    T-storms

  • Saturday

    Saturday: A chance of showers and thunderstorms. Partly sunny, with a high near 88. Southeast wind around 5 mph. Chance of precipitation is 40%.

    High: 88 °F

    Chance
    T-storms

  • Saturday Night

    Saturday Night: A chance of showers and thunderstorms. Mostly cloudy, with a low around 83. East wind around 5 mph. Chance of precipitation is 40%.

    Low: 83 °F

    Chance
    T-storms

  • Sunday

    Sunday: A chance of showers and thunderstorms. Mostly sunny, with a high near 88. Southeast wind around 5 mph becoming calm. Chance of precipitation is 50%.

    High: 88 °F

    Chance
    T-storms

  • Sunday Night

    Sunday Night: A chance of showers and thunderstorms. Partly cloudy, with a low around 83. Chance of precipitation is 30%.

    Low: 83 °F

    Chance
    T-storms

  • Labor Day

    Labor Day: Showers likely and possibly a thunderstorm. Mostly sunny, with a high near 88. Chance of precipitation is 60%.

    High: 88 °F

    Showers
    Likely

  • Monday Night

    Monday Night: A chance of showers and thunderstorms. Partly cloudy, with a low around 83. Chance of precipitation is 40%.

    Low: 83 °F

    Chance
    T-storms

  • Tuesday

    Tuesday: A chance of showers and thunderstorms. Mostly sunny, with a high near 89. Chance of precipitation is 30%.

    High: 89 °F

    Chance
    T-storms

Detailed Forecast

Today
A chance of showers and thunderstorms. Partly sunny, with a high near 88. Southeast wind around 5 mph. Chance of precipitation is 50%.
Tonight
A chance of showers and thunderstorms. Partly cloudy, with a low around 83. East wind around 5 mph. Chance of precipitation is 50%.
Saturday
A chance of showers and thunderstorms. Partly sunny, with a high near 88. Southeast wind around 5 mph. Chance of precipitation is 40%.
Saturday Night
A chance of showers and thunderstorms. Mostly cloudy, with a low around 83. East wind around 5 mph. Chance of precipitation is 40%.
Sunday
A chance of showers and thunderstorms. Mostly sunny, with a high near 88. Southeast wind around 5 mph becoming calm. Chance of precipitation is 50%.
Sunday Night
A chance of showers and thunderstorms. Partly cloudy, with a low around 83. Chance of precipitation is 30%.
Labor Day
Showers likely and possibly a thunderstorm. Mostly sunny, with a high near 88. Chance of precipitation is 60%.
Monday Night
A chance of showers and thunderstorms. Partly cloudy, with a low around 83. Chance of precipitation is 40%.
Tuesday
A chance of showers and thunderstorms. Mostly sunny, with a high near 89. Chance of precipitation is 30%.
Tuesday Night
A chance of showers and thunderstorms. Partly cloudy, with a low around 83. Chance of precipitation is 30%.
Wednesday
A chance of showers and thunderstorms. Mostly sunny, with a high near 89. Chance of precipitation is 30%.
Wednesday Night
A chance of showers and thunderstorms. Partly cloudy, with a low around 83. Chance of precipitation is 40%.
Thursday
A chance of showers and thunderstorms. Mostly sunny, with a high near 89. Chance of precipitation is 30%.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Islamorada FL
 24.93°N 80.62°W (Elev. 3 ft)
Last Update:
8:15 am EDT Sep 4, 2026
Forecast Valid:
8am EDT Sep 4, 2026-6pm EDT Sep 10, 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