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.

Mostly Cloudy

59°F

15°C

Humidity 88%
Wind Speed SE 5 mph
Barometer 30.09 in
Dewpoint 55°F (13°C)
Visibility 10.00 mi
Last update 4 Mar 6:45 am CST
Extended Forecast for

Carterville IL

  • Today

    Today: A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 3pm. Mostly cloudy, with a high near 72. South southwest wind 6 to 10 mph, with gusts as high as 18 mph. Chance of precipitation is 60%.

    High: 72 °F

    Chance
    T-storms then
    Showers
    Likely

  • Tonight

    Tonight: Showers and thunderstorms likely, then showers and possibly a thunderstorm after midnight. Low around 59. South wind 6 to 9 mph. Chance of precipitation is 100%.

    Low: 59 °F

    T-storms
    Likely then
    Showers

  • Thursday

    Thursday: Showers and possibly a thunderstorm. High near 72. Southwest wind 7 to 11 mph, with gusts as high as 20 mph. Chance of precipitation is 90%.

    High: 72 °F

    Showers

  • Thursday Night

    Thursday Night: A chance of showers and thunderstorms. Mostly cloudy, with a low around 60. South wind 5 to 7 mph. Chance of precipitation is 40%.

    Low: 60 °F

    Chance
    T-storms then
    Chance
    Showers

  • Friday

    Friday: A 20 percent chance of showers. Partly sunny, with a high near 78. South wind 8 to 16 mph, with gusts as high as 26 mph.

    High: 78 °F

    Slight Chance
    Showers

  • Friday Night

    Friday Night: A slight chance of showers before 9pm, then a slight chance of showers and thunderstorms between 9pm and midnight, then showers likely and possibly a thunderstorm after midnight. Mostly cloudy, with a low around 59. South wind 10 to 14 mph, with gusts as high as 23 mph. Chance of precipitation is 70%.

    Low: 59 °F

    Slight Chance
    T-storms then
    Showers
    Likely

  • Saturday

    Saturday: Showers and possibly a thunderstorm before noon, then a chance of showers. High near 68. Southwest wind 7 to 11 mph becoming northwest in the afternoon. Winds could gust as high as 21 mph. Chance of precipitation is 80%.

    High: 68 °F

    Showers then
    Chance
    Showers

  • Saturday Night

    Saturday Night: A slight chance of showers. Partly cloudy, with a low around 43. Northwest wind around 6 mph becoming calm in the evening.

    Low: 43 °F

    Slight Chance
    Showers

  • Sunday

    Sunday: Mostly sunny, with a high near 65. Calm wind becoming southwest around 6 mph.

    High: 65 °F

    Mostly Sunny

Detailed Forecast

Today
A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 3pm. Mostly cloudy, with a high near 72. South southwest wind 6 to 10 mph, with gusts as high as 18 mph. Chance of precipitation is 60%.
Tonight
Showers and thunderstorms likely, then showers and possibly a thunderstorm after midnight. Low around 59. South wind 6 to 9 mph. Chance of precipitation is 100%.
Thursday
Showers and possibly a thunderstorm. High near 72. Southwest wind 7 to 11 mph, with gusts as high as 20 mph. Chance of precipitation is 90%.
Thursday Night
A chance of showers and thunderstorms. Mostly cloudy, with a low around 60. South wind 5 to 7 mph. Chance of precipitation is 40%.
Friday
A 20 percent chance of showers. Partly sunny, with a high near 78. South wind 8 to 16 mph, with gusts as high as 26 mph.
Friday Night
A slight chance of showers before 9pm, then a slight chance of showers and thunderstorms between 9pm and midnight, then showers likely and possibly a thunderstorm after midnight. Mostly cloudy, with a low around 59. South wind 10 to 14 mph, with gusts as high as 23 mph. Chance of precipitation is 70%.
Saturday
Showers and possibly a thunderstorm before noon, then a chance of showers. High near 68. Southwest wind 7 to 11 mph becoming northwest in the afternoon. Winds could gust as high as 21 mph. Chance of precipitation is 80%.
Saturday Night
A slight chance of showers. Partly cloudy, with a low around 43. Northwest wind around 6 mph becoming calm in the evening.
Sunday
Mostly sunny, with a high near 65. Calm wind becoming southwest around 6 mph.
Sunday Night
Mostly clear, with a low around 49. Light south southwest wind.
Monday
Mostly sunny, with a high near 76. Light south southwest wind increasing to 5 to 10 mph in the morning.
Monday Night
A chance of showers. Partly cloudy, with a low around 61. South southwest wind 7 to 10 mph, with gusts as high as 20 mph.
Tuesday
A chance of showers and thunderstorms. Mostly cloudy, with a high near 77. South southwest wind 10 to 17 mph, with gusts as high as 29 mph.
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ABOUT THIS FORECAST

 
Point Forecast:
Carterville IL
 37.76°N 89.09°W
Last Update:
4:36 am CST Mar 4, 2026
Forecast Valid:
7am CST Mar 4, 2026-6pm CDT Mar 10, 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