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

80°F

27°C

Humidity 55%
Wind Speed S 9 mph
Barometer 29.97 in
Dewpoint 62°F (17°C)
Visibility 10.00 mi
Heat Index81°F (27°C)
Last update 5 Jun 7:35 pm CDT
Extended Forecast for

Carterville IL

  • Tonight

    Tonight: Partly cloudy, with a low around 69. South southwest wind 5 to 7 mph.

    Low: 69 °F

    Partly Cloudy

  • Saturday

    Saturday: Partly sunny, with a high near 87. South southwest wind 5 to 9 mph.

    High: 87 °F

    Partly Sunny

  • Saturday Night

    Saturday Night: A 30 percent chance of showers and thunderstorms, mainly after 3am. Mostly cloudy, with a low around 70. South southwest wind 5 to 7 mph becoming calm in the evening.

    Low: 70 °F

    Mostly Cloudy
    then Chance
    T-storms

  • Sunday

    Sunday: A chance of showers and thunderstorms before 10am, then a chance of showers between 10am and 1pm, then a chance of showers and thunderstorms after 1pm. Mostly cloudy, with a high near 85. Calm wind becoming south 5 to 9 mph in the morning. Chance of precipitation is 50%.

    High: 85 °F

    Chance
    T-storms

  • Sunday Night

    Sunday Night: A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 1am. Mostly cloudy, with a low around 70. South wind 5 to 8 mph. Chance of precipitation is 70%.

    Low: 70 °F

    Chance
    T-storms then
    Showers
    Likely

  • Monday

    Monday: Showers and possibly a thunderstorm. High near 84. South southwest wind 6 to 9 mph. Chance of precipitation is 90%.

    High: 84 °F

    Showers then
    T-storms

  • Monday Night

    Monday Night: Showers likely and possibly a thunderstorm. Mostly cloudy, with a low around 71. South southwest wind 5 to 8 mph. Chance of precipitation is 60%.

    Low: 71 °F

    Showers
    Likely

  • Tuesday

    Tuesday: A chance of showers and thunderstorms. Partly sunny, with a high near 88. Southwest wind 6 to 8 mph.

    High: 88 °F

    Chance
    T-storms

  • Tuesday Night

    Tuesday Night: A chance of showers and thunderstorms. Mostly clear, with a low around 73. South southwest wind around 6 mph.

    Low: 73 °F

    Chance
    T-storms

Detailed Forecast

Tonight
Partly cloudy, with a low around 69. South southwest wind 5 to 7 mph.
Saturday
Partly sunny, with a high near 87. South southwest wind 5 to 9 mph.
Saturday Night
A 30 percent chance of showers and thunderstorms, mainly after 3am. Mostly cloudy, with a low around 70. South southwest wind 5 to 7 mph becoming calm in the evening.
Sunday
A chance of showers and thunderstorms before 10am, then a chance of showers between 10am and 1pm, then a chance of showers and thunderstorms after 1pm. Mostly cloudy, with a high near 85. Calm wind becoming south 5 to 9 mph in the morning. Chance of precipitation is 50%.
Sunday Night
A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 1am. Mostly cloudy, with a low around 70. South wind 5 to 8 mph. Chance of precipitation is 70%.
Monday
Showers and possibly a thunderstorm. High near 84. South southwest wind 6 to 9 mph. Chance of precipitation is 90%.
Monday Night
Showers likely and possibly a thunderstorm. Mostly cloudy, with a low around 71. South southwest wind 5 to 8 mph. Chance of precipitation is 60%.
Tuesday
A chance of showers and thunderstorms. Partly sunny, with a high near 88. Southwest wind 6 to 8 mph.
Tuesday Night
A chance of showers and thunderstorms. Mostly clear, with a low around 73. South southwest wind around 6 mph.
Wednesday
A slight chance of showers and thunderstorms before 1pm. Sunny, with a high near 90. South southwest wind 5 to 8 mph.
Wednesday Night
Mostly clear, with a low around 74. South wind 3 to 6 mph.
Thursday
Sunny, with a high near 92. South southwest wind 5 to 8 mph.
Thursday Night
Mostly clear, with a low around 75. South wind 3 to 7 mph.
Friday
A slight chance of showers and thunderstorms. Sunny, with a high near 92. Southwest wind 3 to 6 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:
7:26 pm CDT Jun 5, 2026
Forecast Valid:
7pm CDT Jun 5, 2026-6pm CDT Jun 12, 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