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

90°F

32°C

Humidity 49%
Wind Speed SW 12 mph
Barometer 29.96 in
Dewpoint 68°F (20°C)
Visibility 10.00 mi
Heat Index94°F (34°C)
Last update 13 Oct 1:45 pm CDT
Extended Forecast for

Carterville IL

  • This Afternoon

    This Afternoon: Sunny, with a high near 92. South southwest wind around 11 mph.

    High: 92 °F

    Sunny

  • Tonight

    Tonight: A 20 percent chance of showers and thunderstorms after 4am. Mostly clear, with a low around 73. South southwest wind around 5 mph.

    Low: 73 °F

    Clear then
    Slight Chance
    T-storms

  • Wednesday

    Wednesday: Showers and thunderstorms before 11am, then showers likely and possibly a thunderstorm between 11am and 3pm, then a chance of showers and thunderstorms after 3pm. High near 82. Southwest wind 5 to 7 mph becoming north northwest in the morning. Chance of precipitation is 80%.

    High: 82 °F

    Showers

  • Wednesday Night

    Wednesday Night: A chance of showers and thunderstorms before 9pm, then a chance of showers and thunderstorms after 1am. Mostly cloudy, with a low around 67. Calm wind. Chance of precipitation is 50%.

    Low: 67 °F

    Chance
    Showers then
    Chance
    T-storms

  • Thursday

    Thursday: Showers likely and possibly a thunderstorm before 1pm, then a chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 86. Light and variable wind becoming southwest 5 to 10 mph in the morning. Chance of precipitation is 60%.

    High: 86 °F

    Showers
    Likely

  • Thursday Night

    Thursday Night: A chance of showers and thunderstorms. Mostly cloudy, with a low around 53. South southwest wind 6 to 16 mph becoming northwest after midnight. Winds could gust as high as 23 mph. Chance of precipitation is 40%.

    Low: 53 °F

    Chance
    Showers

  • Friday

    Friday: Mostly sunny, with a high near 62. Breezy, with a north northwest wind 17 to 20 mph, with gusts as high as 30 mph.

    High: 62 °F

    Mostly Sunny
    and Breezy

  • Friday Night

    Friday Night: Mostly clear, with a low around 40. North wind 6 to 14 mph, with gusts as high as 20 mph.

    Low: 40 °F

    Mostly Clear

  • Saturday

    Saturday: Sunny, with a high near 62. Northeast wind 3 to 7 mph.

    High: 62 °F

    Sunny

Detailed Forecast

This Afternoon
Sunny, with a high near 92. South southwest wind around 11 mph.
Tonight
A 20 percent chance of showers and thunderstorms after 4am. Mostly clear, with a low around 73. South southwest wind around 5 mph.
Wednesday
Showers and thunderstorms before 11am, then showers likely and possibly a thunderstorm between 11am and 3pm, then a chance of showers and thunderstorms after 3pm. High near 82. Southwest wind 5 to 7 mph becoming north northwest in the morning. Chance of precipitation is 80%.
Wednesday Night
A chance of showers and thunderstorms before 9pm, then a chance of showers and thunderstorms after 1am. Mostly cloudy, with a low around 67. Calm wind. Chance of precipitation is 50%.
Thursday
Showers likely and possibly a thunderstorm before 1pm, then a chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 86. Light and variable wind becoming southwest 5 to 10 mph in the morning. Chance of precipitation is 60%.
Thursday Night
A chance of showers and thunderstorms. Mostly cloudy, with a low around 53. South southwest wind 6 to 16 mph becoming northwest after midnight. Winds could gust as high as 23 mph. Chance of precipitation is 40%.
Friday
Mostly sunny, with a high near 62. Breezy, with a north northwest wind 17 to 20 mph, with gusts as high as 30 mph.
Friday Night
Mostly clear, with a low around 40. North wind 6 to 14 mph, with gusts as high as 20 mph.
Saturday
Sunny, with a high near 62. Northeast wind 3 to 7 mph.
Saturday Night
Clear, with a low around 38. Calm wind.
Sunday
Sunny, with a high near 69. Calm wind becoming south 5 to 7 mph in the afternoon.
Sunday Night
Partly cloudy, with a low around 46. Light south southeast wind.
Monday
Partly sunny, with a high near 72. South wind 3 to 7 mph.
Basemap Options
Click map to change the forecast location
Loading map...
Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Carterville IL
 37.76°N 89.09°W
Last Update:
1:56 pm CDT Oct 13, 2026
Forecast Valid:
2pm CDT Oct 13, 2026-6pm CDT Oct 19, 2026
 
Forecast Discussion
 
Get as KML Get as XML

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