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

Marion - Williamson County Regional Airport (KMWA)

Lat: 37.77°NLon: 89.01°WElev: 486ft.

Fair

81°F

27°C

Humidity 39%
Wind Speed S 9 mph
Barometer 29.91 in
Dewpoint 54°F (12°C)
Visibility 10.00 mi
Heat Index81°F (27°C)
Last update 7 Oct 5:48 pm CDT
Extended Forecast for

Carterville IL

  • Tonight

    Tonight: Clear, with a low around 58. South southwest wind around 5 mph becoming calm in the evening.

    Low: 58 °F

    Clear

  • Thursday

    Thursday: Sunny, with a high near 84. Calm wind becoming northeast around 5 mph.

    High: 84 °F

    Sunny

  • Thursday Night

    Thursday Night: Clear, with a low around 57. Calm wind.

    Low: 57 °F

    Clear

  • Friday

    Friday: Sunny, with a high near 87. Calm wind becoming south southeast 5 to 7 mph in the morning.

    High: 87 °F

    Sunny

  • Friday Night

    Friday Night: Mostly clear, with a low around 61. Light south southeast wind.

    Low: 61 °F

    Mostly Clear

  • Saturday

    Saturday: A 40 percent chance of showers after 1pm. Partly sunny, with a high near 82. Light and variable wind becoming east southeast 5 to 9 mph in the morning.

    High: 82 °F

    Mostly Sunny
    then Chance
    Showers

  • Saturday Night

    Saturday Night: Showers and possibly a thunderstorm before 1am, then showers likely. Low around 58. East northeast wind 7 to 10 mph. Chance of precipitation is 80%.

    Low: 58 °F

    Showers

  • Sunday

    Sunday: Partly sunny, with a high near 75. Northeast wind 8 to 10 mph becoming west northwest in the afternoon.

    High: 75 °F

    Partly Sunny

  • Sunday Night

    Sunday Night: Partly cloudy, with a low around 58. Calm wind.

    Low: 58 °F

    Partly Cloudy

Detailed Forecast

Tonight
Clear, with a low around 58. South southwest wind around 5 mph becoming calm in the evening.
Thursday
Sunny, with a high near 84. Calm wind becoming northeast around 5 mph.
Thursday Night
Clear, with a low around 57. Calm wind.
Friday
Sunny, with a high near 87. Calm wind becoming south southeast 5 to 7 mph in the morning.
Friday Night
Mostly clear, with a low around 61. Light south southeast wind.
Saturday
A 40 percent chance of showers after 1pm. Partly sunny, with a high near 82. Light and variable wind becoming east southeast 5 to 9 mph in the morning.
Saturday Night
Showers and possibly a thunderstorm before 1am, then showers likely. Low around 58. East northeast wind 7 to 10 mph. Chance of precipitation is 80%.
Sunday
Partly sunny, with a high near 75. Northeast wind 8 to 10 mph becoming west northwest in the afternoon.
Sunday Night
Partly cloudy, with a low around 58. Calm wind.
Columbus Day
Mostly sunny, with a high near 85. Light southwest wind becoming south southwest 5 to 10 mph in the afternoon.
Monday Night
Mostly clear, with a low around 57. South southwest wind 6 to 8 mph.
Tuesday
Sunny, with a high near 76. West wind 7 to 11 mph becoming north northwest in the afternoon. Winds could gust as high as 18 mph.
Tuesday Night
Mostly clear, with a low around 50. North northeast wind 5 to 8 mph.
Wednesday
Mostly sunny, with a high near 73. East wind 5 to 7 mph.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Carterville IL
 37.76°N 89.09°W
Last Update:
1:50 pm CDT Oct 7, 2026
Forecast Valid:
6pm CDT Oct 7, 2026-6pm CDT Oct 14, 2026
 
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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