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

48°F

9°C

Humidity 90%
Wind Speed Calm
Barometer 30.11 in
Dewpoint 45°F (7°C)
Visibility 10.00 mi
Last update 2 May 7:55 pm CDT
Extended Forecast for

Carterville IL

  • Tonight

    Tonight: Mostly clear, with a low around 39. North northeast wind around 5 mph becoming calm in the evening.

    Low: 39 °F

    Mostly Clear

  • Sunday

    Sunday: Sunny, with a high near 71. Light south southwest wind increasing to 10 to 15 mph in the morning. Winds could gust as high as 24 mph.

    High: 71 °F

    Sunny

  • Sunday Night

    Sunday Night: A 50 percent chance of showers and thunderstorms. Partly cloudy, with a low around 56. South southwest wind 7 to 11 mph, with gusts as high as 20 mph.

    Low: 56 °F

    Chance
    T-storms

  • Monday

    Monday: A slight chance of showers and thunderstorms before 10am, then a slight chance of showers between 10am and 1pm, then a chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 80. Southwest wind 8 to 15 mph, with gusts as high as 25 mph. Chance of precipitation is 30%.

    High: 80 °F

    Chance
    T-storms

  • Monday Night

    Monday Night: A chance of showers and thunderstorms before 1am, then a chance of showers between 1am and 4am, then a chance of showers and thunderstorms after 4am. Partly cloudy, with a low around 59. South southwest wind 11 to 13 mph, with gusts as high as 22 mph. Chance of precipitation is 50%.

    Low: 59 °F

    Chance
    T-storms then
    Chance
    Showers

  • Tuesday

    Tuesday: Showers and possibly a thunderstorm before 10am, then showers between 10am and 1pm, then showers and possibly a thunderstorm after 1pm. High near 71. South southwest wind 11 to 14 mph, with gusts as high as 24 mph. Chance of precipitation is 90%.

    High: 71 °F

    Showers

  • Tuesday Night

    Tuesday Night: Showers and possibly a thunderstorm. Low around 49. Southwest wind 8 to 14 mph becoming north after midnight. Winds could gust as high as 21 mph. Chance of precipitation is 90%.

    Low: 49 °F

    Showers

  • Wednesday

    Wednesday: Showers likely and possibly a thunderstorm. Mostly cloudy, with a high near 61. North northeast wind 6 to 8 mph.

    High: 61 °F

    Showers
    Likely

  • Wednesday Night

    Wednesday Night: A chance of showers, mainly before 1am. Mostly cloudy, with a low around 45. North northeast wind around 9 mph.

    Low: 45 °F

    Chance
    Showers

Detailed Forecast

Tonight
Mostly clear, with a low around 39. North northeast wind around 5 mph becoming calm in the evening.
Sunday
Sunny, with a high near 71. Light south southwest wind increasing to 10 to 15 mph in the morning. Winds could gust as high as 24 mph.
Sunday Night
A 50 percent chance of showers and thunderstorms. Partly cloudy, with a low around 56. South southwest wind 7 to 11 mph, with gusts as high as 20 mph.
Monday
A slight chance of showers and thunderstorms before 10am, then a slight chance of showers between 10am and 1pm, then a chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 80. Southwest wind 8 to 15 mph, with gusts as high as 25 mph. Chance of precipitation is 30%.
Monday Night
A chance of showers and thunderstorms before 1am, then a chance of showers between 1am and 4am, then a chance of showers and thunderstorms after 4am. Partly cloudy, with a low around 59. South southwest wind 11 to 13 mph, with gusts as high as 22 mph. Chance of precipitation is 50%.
Tuesday
Showers and possibly a thunderstorm before 10am, then showers between 10am and 1pm, then showers and possibly a thunderstorm after 1pm. High near 71. South southwest wind 11 to 14 mph, with gusts as high as 24 mph. Chance of precipitation is 90%.
Tuesday Night
Showers and possibly a thunderstorm. Low around 49. Southwest wind 8 to 14 mph becoming north after midnight. Winds could gust as high as 21 mph. Chance of precipitation is 90%.
Wednesday
Showers likely and possibly a thunderstorm. Mostly cloudy, with a high near 61. North northeast wind 6 to 8 mph.
Wednesday Night
A chance of showers, mainly before 1am. Mostly cloudy, with a low around 45. North northeast wind around 9 mph.
Thursday
Mostly sunny, with a high near 65. Northwest wind 7 to 10 mph, with gusts as high as 20 mph.
Thursday Night
Mostly clear, with a low around 46. West wind around 5 mph becoming calm in the evening.
Friday
Mostly sunny, with a high near 72. South southwest wind 5 to 10 mph, with gusts as high as 18 mph.
Friday Night
A slight chance of showers and thunderstorms. Partly cloudy, with a low around 53. South wind 5 to 8 mph.
Saturday
Mostly sunny, with a high near 79. West southwest wind 3 to 7 mph.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Carterville IL
 37.76°N 89.09°W
Last Update:
4:31 pm CDT May 2, 2026
Forecast Valid:
8pm CDT May 2, 2026-6pm CDT May 9, 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