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

68°F

20°C

Humidity 70%
Wind Speed Calm
Barometer 30.16 in
Dewpoint 58°F (14°C)
Visibility 10.00 mi
Last update 23 Jun 8:35 pm CDT
Extended Forecast for

4 Miles SSW Carterville IL

  • Tonight

    Tonight: Partly cloudy, with a low around 63. Calm wind.

    Low: 63 °F

    Partly Cloudy

  • Wednesday

    Wednesday: Mostly sunny, with a high near 83. Calm wind becoming south around 5 mph in the afternoon.

    High: 83 °F

    Mostly Sunny

  • Wednesday Night

    Wednesday Night: A 30 percent chance of showers, mainly after 5am. Partly cloudy, with a low around 67. Light south wind.

    Low: 67 °F

    Partly Cloudy
    then Chance
    Showers

  • Thursday

    Thursday: A 50 percent chance of showers and thunderstorms, mainly after 1pm. Mostly sunny, with a high near 85. Calm wind becoming south southwest around 5 mph in the afternoon.

    High: 85 °F

    Chance
    Showers then
    Chance
    T-storms

  • Thursday Night

    Thursday Night: Showers and possibly a thunderstorm. Low around 70. Light south wind. Chance of precipitation is 90%.

    Low: 70 °F

    Showers

  • Friday

    Friday: Showers, with thunderstorms also possible after 7am. High near 83. Southwest wind 5 to 9 mph, with gusts as high as 18 mph. Chance of precipitation is 80%.

    High: 83 °F

    Showers

  • Friday Night

    Friday Night: Showers likely and possibly a thunderstorm. Mostly cloudy, with a low around 73. South southwest wind 5 to 7 mph becoming calm in the evening. Chance of precipitation is 60%.

    Low: 73 °F

    Showers
    Likely

  • Saturday

    Saturday: A chance of showers and thunderstorms. Partly sunny, with a high near 87. Southwest wind 3 to 7 mph.

    High: 87 °F

    Chance
    T-storms

  • Saturday Night

    Saturday Night: A slight chance of showers and thunderstorms. Partly cloudy, with a low around 74. South wind 3 to 5 mph.

    Low: 74 °F

    Slight Chance
    T-storms

Detailed Forecast

Tonight
Partly cloudy, with a low around 63. Calm wind.
Wednesday
Mostly sunny, with a high near 83. Calm wind becoming south around 5 mph in the afternoon.
Wednesday Night
A 30 percent chance of showers, mainly after 5am. Partly cloudy, with a low around 67. Light south wind.
Thursday
A 50 percent chance of showers and thunderstorms, mainly after 1pm. Mostly sunny, with a high near 85. Calm wind becoming south southwest around 5 mph in the afternoon.
Thursday Night
Showers and possibly a thunderstorm. Low around 70. Light south wind. Chance of precipitation is 90%.
Friday
Showers, with thunderstorms also possible after 7am. High near 83. Southwest wind 5 to 9 mph, with gusts as high as 18 mph. Chance of precipitation is 80%.
Friday Night
Showers likely and possibly a thunderstorm. Mostly cloudy, with a low around 73. South southwest wind 5 to 7 mph becoming calm in the evening. Chance of precipitation is 60%.
Saturday
A chance of showers and thunderstorms. Partly sunny, with a high near 87. Southwest wind 3 to 7 mph.
Saturday Night
A slight chance of showers and thunderstorms. Partly cloudy, with a low around 74. South wind 3 to 5 mph.
Sunday
Mostly sunny, with a high near 93. South southwest wind 6 to 11 mph, with gusts as high as 20 mph.
Sunday Night
Mostly clear, with a low around 75. South southwest wind 5 to 9 mph.
Monday
Sunny, with a high near 95. South southwest wind 5 to 9 mph.
Monday Night
Clear, with a low around 76. South wind 3 to 7 mph.
Tuesday
Sunny, with a high near 96. Calm wind becoming south southwest 5 to 7 mph in the morning.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
4 Miles SSW Carterville IL
 37.72°N 89.12°W
Last Update:
8:06 pm CDT Jun 23, 2026
Forecast Valid:
8pm CDT Jun 23, 2026-6pm CDT Jun 30, 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