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

57°F

14°C

Humidity 59%
Wind Speed SE 10 mph
Barometer 29.98 in
Dewpoint 43°F (6°C)
Visibility 10.00 mi
Last update 15 May 6:45 am CDT
Extended Forecast for

Carterville IL

  • Today

    Today: Partly sunny, with a high near 82. South southeast wind 7 to 15 mph, with gusts as high as 24 mph.

    High: 82 °F

    Partly Sunny

  • Tonight

    Tonight: A slight chance of showers and thunderstorms before 11pm, then a slight chance of showers and thunderstorms after 1am. Mostly cloudy, with a low around 68. South wind around 11 mph, with gusts as high as 21 mph. Chance of precipitation is 20%.

    Low: 68 °F

    Slight Chance
    T-storms

  • Saturday

    Saturday: A 40 percent chance of showers and thunderstorms, mainly after 11am. Mostly cloudy, with a high near 86. South southwest wind around 11 mph, with gusts as high as 21 mph.

    High: 86 °F

    Chance
    Showers then
    Chance
    T-storms

  • Saturday Night

    Saturday Night: Partly cloudy, with a low around 66. South wind around 9 mph.

    Low: 66 °F

    Partly Cloudy

  • Sunday

    Sunday: Sunny, with a high near 88. South wind 8 to 15 mph, with gusts as high as 24 mph.

    High: 88 °F

    Sunny

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 70. South wind 10 to 13 mph, with gusts as high as 21 mph.

    Low: 70 °F

    Mostly Clear

  • Monday

    Monday: A 30 percent chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 90. South wind 11 to 17 mph, with gusts as high as 26 mph.

    High: 90 °F

    Mostly Sunny
    then Chance
    T-storms

  • Monday Night

    Monday Night: A slight chance of showers and thunderstorms. Partly cloudy, with a low around 72. South wind 13 to 15 mph, with gusts as high as 23 mph.

    Low: 72 °F

    Slight Chance
    T-storms

  • Tuesday

    Tuesday: A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 1pm. Partly sunny, with a high near 86. South southwest wind 11 to 15 mph, with gusts as high as 25 mph.

    High: 86 °F

    Chance
    T-storms then
    Showers
    Likely

Detailed Forecast

Today
Partly sunny, with a high near 82. South southeast wind 7 to 15 mph, with gusts as high as 24 mph.
Tonight
A slight chance of showers and thunderstorms before 11pm, then a slight chance of showers and thunderstorms after 1am. Mostly cloudy, with a low around 68. South wind around 11 mph, with gusts as high as 21 mph. Chance of precipitation is 20%.
Saturday
A 40 percent chance of showers and thunderstorms, mainly after 11am. Mostly cloudy, with a high near 86. South southwest wind around 11 mph, with gusts as high as 21 mph.
Saturday Night
Partly cloudy, with a low around 66. South wind around 9 mph.
Sunday
Sunny, with a high near 88. South wind 8 to 15 mph, with gusts as high as 24 mph.
Sunday Night
Mostly clear, with a low around 70. South wind 10 to 13 mph, with gusts as high as 21 mph.
Monday
A 30 percent chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 90. South wind 11 to 17 mph, with gusts as high as 26 mph.
Monday Night
A slight chance of showers and thunderstorms. Partly cloudy, with a low around 72. South wind 13 to 15 mph, with gusts as high as 23 mph.
Tuesday
A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 1pm. Partly sunny, with a high near 86. South southwest wind 11 to 15 mph, with gusts as high as 25 mph.
Tuesday Night
Showers likely and possibly a thunderstorm. Mostly cloudy, with a low around 64. South southwest wind 6 to 11 mph becoming west after midnight. Winds could gust as high as 18 mph.
Wednesday
A chance of showers and thunderstorms. Partly sunny, with a high near 78. North wind around 8 mph.
Wednesday Night
A chance of showers and thunderstorms. Mostly cloudy, with a low around 58. North northeast wind 5 to 7 mph.
Thursday
A chance of showers and thunderstorms. Partly sunny, with a high near 77. Northeast wind 6 to 8 mph.
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ABOUT THIS FORECAST

 
Point Forecast:
Carterville IL
 37.76°N 89.09°W
Last Update:
3:32 am CDT May 15, 2026
Forecast Valid:
6am CDT May 15, 2026-6pm CDT May 21, 2026
 
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Additional Resources

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Hourly Weather Forecast

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High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation