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

Hazardous Weather Conditions

Current conditions at

Marion - Williamson County Regional Airport (KMWA)

Lat: 37.77°NLon: 89.01°WElev: 486ft.

Fair

93°F

34°C

Humidity 53%
Wind Speed SW 9 mph
Barometer 30.07 in
Dewpoint 73°F (23°C)
Visibility 10.00 mi
Heat Index103°F (39°C)
Last update 2 Jul 4:45 pm CDT
Extended Forecast for

Carterville IL

Heat Advisory July 3, 08:00pm until July 4, 08:00pm
Extreme Heat Warning July 2, 05:40pm until July 3, 08:00pm
Click here for hazard details and duration
Heat Advisory
Extreme Heat Warning
  •  
    Extreme Heat Warning July 2, 05:40pm until July 3, 08:00pm

    NOW until 8:00pm Fri

    Extreme Heat Warning

  • This Afternoon

    High: 96 °F

    Slight Chance
    T-storms

  • Tonight

    Tonight: A 10 percent chance of showers and thunderstorms before 7pm. Mostly clear, with a low around 75. Light and variable wind.

    Low: 75 °F

    Slight Chance
    T-storms then
    Mostly Clear

  • Friday

    Friday: Sunny, with a high near 95. Heat index values as high as 106. Calm wind becoming south southwest 5 to 7 mph in the afternoon.

    High: 95 °F

    Sunny

  • Friday Night

    Friday Night: Mostly clear, with a low around 75. Light and variable wind.

    Low: 75 °F

    Mostly Clear

  • Independence Day

    Independence Day: A 30 percent chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 95. Calm wind becoming south southwest around 5 mph in the afternoon.

    High: 95 °F

    Mostly Sunny
    then Chance
    T-storms

  • Saturday Night

    Saturday Night: A 30 percent chance of showers and thunderstorms. Partly cloudy, with a low around 74. Calm wind.

    Low: 74 °F

    Chance
    T-storms then
    Chance
    Showers

  • Sunday

    Sunday: A 40 percent chance of showers and thunderstorms, mainly after 1pm. Mostly sunny, with a high near 93. Light west southwest wind.

    High: 93 °F

    Chance
    T-storms

  • Sunday Night

    Sunday Night: A chance of showers and thunderstorms, mainly before 1am. Partly cloudy, with a low around 72. Calm wind.

    Low: 72 °F

    Chance
    T-storms

Detailed Forecast

This Afternoon
A 20 percent chance of showers and thunderstorms. Sunny, with a high near 96. Heat index values as high as 110. Calm wind.
Tonight
A 10 percent chance of showers and thunderstorms before 7pm. Mostly clear, with a low around 75. Light and variable wind.
Friday
Sunny, with a high near 95. Heat index values as high as 106. Calm wind becoming south southwest 5 to 7 mph in the afternoon.
Friday Night
Mostly clear, with a low around 75. Light and variable wind.
Independence Day
A 30 percent chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 95. Calm wind becoming south southwest around 5 mph in the afternoon.
Saturday Night
A 30 percent chance of showers and thunderstorms. Partly cloudy, with a low around 74. Calm wind.
Sunday
A 40 percent chance of showers and thunderstorms, mainly after 1pm. Mostly sunny, with a high near 93. Light west southwest wind.
Sunday Night
A chance of showers and thunderstorms, mainly before 1am. Partly cloudy, with a low around 72. Calm wind.
Monday
A chance of showers and thunderstorms, mainly after 1pm. Mostly sunny, with a high near 91. Calm wind becoming northwest around 5 mph in the afternoon.
Monday Night
A slight chance of showers and thunderstorms before 1am. Partly cloudy, with a low around 71. Calm wind.
Tuesday
A chance of showers and thunderstorms. Partly sunny, with a high near 90. Light north northeast wind.
Tuesday Night
A slight chance of showers and thunderstorms. Partly cloudy, with a low around 71. Light north wind.
Wednesday
A chance of showers and thunderstorms. Mostly sunny, with a high near 91. Light and variable wind.
Wednesday Night
A slight chance of showers and thunderstorms. Mostly clear, with a low around 72. Calm wind.
Thursday
A chance of showers and thunderstorms. Sunny, with a high near 91. Calm wind becoming southwest around 6 mph in the afternoon.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Carterville IL
 37.76°N 89.09°W
Last Update:
5:06 pm CDT Jul 2, 2026
Forecast Valid:
5pm CDT Jul 2, 2026-6pm CDT Jul 9, 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