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

55°F

13°C

Humidity 94%
Wind Speed NW 5 mph
Barometer 30.02 in
Dewpoint 54°F (12°C)
Visibility 10.00 mi
Wind Chill54°F (12°C)
Last update 11 Oct 7:45 am CDT
Extended Forecast for

Carterville IL

  • Today

    Today: Sunny, with a high near 85. Northwest wind 3 to 5 mph.

    High: 85 °F

    Sunny

  • Tonight

    Tonight: Mostly clear, with a low around 61. Calm wind becoming southwest around 5 mph after midnight.

    Low: 61 °F

    Mostly Clear

  • Columbus Day

    Columbus Day: Sunny, with a high near 90. Southwest wind 5 to 11 mph, with gusts as high as 18 mph.

    High: 90 °F

    Sunny

  • Monday Night

    Monday Night: Clear, with a low around 67. Southwest wind around 7 mph.

    Low: 67 °F

    Clear

  • Tuesday

    Tuesday: Sunny, with a high near 92. Southwest wind 7 to 10 mph.

    High: 92 °F

    Sunny

  • Tuesday Night

    Tuesday Night: Mostly clear, with a low around 69. South southwest wind around 5 mph.

    Low: 69 °F

    Mostly Clear

  • Wednesday

    Wednesday: A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 1pm. Partly sunny, with a high near 86. West southwest wind 3 to 7 mph. Chance of precipitation is 60%.

    High: 86 °F

    Chance
    T-storms then
    Showers
    Likely

  • Wednesday Night

    Wednesday Night: A chance of showers and thunderstorms. Mostly cloudy, with a low around 65. Northeast wind 3 to 5 mph.

    Low: 65 °F

    Chance
    Showers

  • Thursday

    Thursday: A chance of showers, with thunderstorms also possible after 1pm. Partly sunny, with a high near 82. East wind 7 to 10 mph becoming south southwest in the afternoon.

    High: 82 °F

    Chance
    Showers

Detailed Forecast

Today
Sunny, with a high near 85. Northwest wind 3 to 5 mph.
Tonight
Mostly clear, with a low around 61. Calm wind becoming southwest around 5 mph after midnight.
Columbus Day
Sunny, with a high near 90. Southwest wind 5 to 11 mph, with gusts as high as 18 mph.
Monday Night
Clear, with a low around 67. Southwest wind around 7 mph.
Tuesday
Sunny, with a high near 92. Southwest wind 7 to 10 mph.
Tuesday Night
Mostly clear, with a low around 69. South southwest wind around 5 mph.
Wednesday
A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 1pm. Partly sunny, with a high near 86. West southwest wind 3 to 7 mph. Chance of precipitation is 60%.
Wednesday Night
A chance of showers and thunderstorms. Mostly cloudy, with a low around 65. Northeast wind 3 to 5 mph.
Thursday
A chance of showers, with thunderstorms also possible after 1pm. Partly sunny, with a high near 82. East wind 7 to 10 mph becoming south southwest in the afternoon.
Thursday Night
A chance of showers and thunderstorms. Mostly cloudy, with a low around 56. South southwest wind 6 to 9 mph becoming west northwest after midnight.
Friday
A slight chance of showers. Partly sunny, with a high near 70. Northwest wind 13 to 15 mph, with gusts as high as 22 mph.
Friday Night
Partly cloudy, with a low around 43. North northwest wind 9 to 16 mph, with gusts as high as 21 mph.
Saturday
Mostly sunny, with a high near 61. North wind 10 to 14 mph, with gusts as high as 20 mph.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Carterville IL
 37.76°N 89.09°W
Last Update:
4:56 am CDT Oct 11, 2026
Forecast Valid:
8am CDT Oct 11, 2026-6pm CDT Oct 17, 2026
 
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Additional Resources

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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