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.

Partly Cloudy

97°F

36°C

Humidity 42%
Wind Speed SW 12 mph
Barometer 29.99 in
Dewpoint 70°F (21°C)
Visibility 10.00 mi
Heat Index104°F (40°C)
Last update 2 Sep 4:45 pm CDT
Extended Forecast for

2 Miles SW Carterville IL

Extreme Heat Warning September 2, 05:32pm until September 5, 08:00pm
Click here for hazard details and duration
Extreme Heat Warning
  •  
    Extreme Heat Warning September 2, 05:32pm until September 5, 08:00pm

    NOW until 8:00pm Sat

    Extreme Heat Warning

  • Tonight

    Low: 76 °F

    Mostly Clear

  • Thursday

    Thursday: Sunny and hot, with a high near 97. Heat index values as high as 105. Calm wind becoming southwest around 6 mph in the afternoon.

    High: 97 °F

    Hot

  • Thursday Night

    Thursday Night: Clear, with a low around 77. Calm wind.

    Low: 77 °F

    Clear

  • Friday

    Friday: Sunny and hot, with a high near 98. Heat index values as high as 106. Calm wind.

    High: 98 °F

    Hot

  • Friday Night

    Friday Night: Mostly clear, with a low around 76. Calm wind.

    Low: 76 °F

    Mostly Clear

  • Saturday

    Saturday: Mostly sunny and hot, with a high near 97. Calm wind.

    High: 97 °F

    Hot

  • Saturday Night

    Saturday Night: Partly cloudy, with a low around 73. Calm wind.

    Low: 73 °F

    Partly Cloudy

  • Sunday

    Sunday: Sunny, with a high near 94. Calm wind becoming northeast around 6 mph in the afternoon.

    High: 94 °F

    Sunny

Detailed Forecast

Tonight
Mostly clear, with a low around 76. South wind around 5 mph becoming calm in the evening.
Thursday
Sunny and hot, with a high near 97. Heat index values as high as 105. Calm wind becoming southwest around 6 mph in the afternoon.
Thursday Night
Clear, with a low around 77. Calm wind.
Friday
Sunny and hot, with a high near 98. Heat index values as high as 106. Calm wind.
Friday Night
Mostly clear, with a low around 76. Calm wind.
Saturday
Mostly sunny and hot, with a high near 97. Calm wind.
Saturday Night
Partly cloudy, with a low around 73. Calm wind.
Sunday
Sunny, with a high near 94. Calm wind becoming northeast around 6 mph in the afternoon.
Sunday Night
Mostly clear, with a low around 71. East northeast wind around 5 mph becoming calm in the evening.
Labor Day
Sunny, with a high near 93. Calm wind becoming east southeast around 5 mph in the afternoon.
Monday Night
Mostly clear, with a low around 71. Light east southeast wind.
Tuesday
Mostly sunny, with a high near 93. Calm wind becoming south southwest around 6 mph in the morning.
Tuesday Night
Mostly clear, with a low around 73. South wind 3 to 6 mph.
Wednesday
Sunny, with a high near 94. Southwest wind 6 to 9 mph.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
2 Miles SW Carterville IL
 37.74°N 89.12°W
Last Update:
1:25 pm CDT Sep 2, 2026
Forecast Valid:
5pm CDT Sep 2, 2026-6pm CDT Sep 9, 2026
 
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Additional Resources

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Hourly Weather Forecast

National Digital Forecast Database

National Digital Forecast Database Maximum Temperature Forecast

High Temperature

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Chance of Precipitation