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.

Fair

68°F

20°C

Humidity 89%
Wind Speed Calm
Barometer 29.99 in
Dewpoint 65°F (18°C)
Visibility 10.00 mi
Last update 21 Sep 1:35 am CDT
Extended Forecast for

4 Miles SSW Carterville IL

  • Overnight

    Overnight: A 20 percent chance of showers and thunderstorms after 4am. Mostly cloudy, with a low around 67. Calm wind.

    Low: 67 °F

    Slight Chance
    T-storms

  • Sunday

    Sunday: Showers and thunderstorms likely, mainly before 3pm. Partly sunny, with a high near 84. Light south southwest wind becoming southwest 5 to 9 mph in the morning. Chance of precipitation is 60%.

    High: 84 °F

    Showers
    Likely then
    Chance
    T-storms

  • Sunday Night

    Sunday Night: A slight chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 1am. Partly cloudy, with a low around 67. South southwest wind around 5 mph becoming calm in the evening. Chance of precipitation is 60%.

    Low: 67 °F

    Slight Chance
    T-storms then
    Showers
    Likely

  • Monday

    Monday: Showers likely and possibly a thunderstorm. Mostly cloudy, with a high near 82. Light south wind becoming south southwest 5 to 9 mph in the morning. Chance of precipitation is 70%.

    High: 82 °F

    Showers
    Likely

  • Monday Night

    Monday Night: Showers and possibly a thunderstorm. Low around 66. South wind around 5 mph becoming calm in the evening. Chance of precipitation is 80%.

    Low: 66 °F

    Showers

  • Tuesday

    Tuesday: A chance of showers, with thunderstorms also possible after 1pm. Mostly cloudy, with a high near 78. Calm wind becoming southwest around 6 mph in the morning. Chance of precipitation is 50%.

    High: 78 °F

    Chance
    Showers then
    Chance
    T-storms

  • Tuesday Night

    Tuesday Night: A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 1am. Mostly cloudy, with a low around 67. Calm wind. Chance of precipitation is 70%.

    Low: 67 °F

    Chance
    T-storms then
    Showers
    Likely

  • Wednesday

    Wednesday: Showers likely and possibly a thunderstorm. Mostly cloudy, with a high near 75. Southeast wind 3 to 7 mph.

    High: 75 °F

    Showers
    Likely

  • Wednesday Night

    Wednesday Night: A chance of showers and thunderstorms. Mostly cloudy, with a low around 64. North northeast wind 3 to 6 mph.

    Low: 64 °F

    Chance
    T-storms

Detailed Forecast

Overnight
A 20 percent chance of showers and thunderstorms after 4am. Mostly cloudy, with a low around 67. Calm wind.
Sunday
Showers and thunderstorms likely, mainly before 3pm. Partly sunny, with a high near 84. Light south southwest wind becoming southwest 5 to 9 mph in the morning. Chance of precipitation is 60%.
Sunday Night
A slight chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 1am. Partly cloudy, with a low around 67. South southwest wind around 5 mph becoming calm in the evening. Chance of precipitation is 60%.
Monday
Showers likely and possibly a thunderstorm. Mostly cloudy, with a high near 82. Light south wind becoming south southwest 5 to 9 mph in the morning. Chance of precipitation is 70%.
Monday Night
Showers and possibly a thunderstorm. Low around 66. South wind around 5 mph becoming calm in the evening. Chance of precipitation is 80%.
Tuesday
A chance of showers, with thunderstorms also possible after 1pm. Mostly cloudy, with a high near 78. Calm wind becoming southwest around 6 mph in the morning. Chance of precipitation is 50%.
Tuesday Night
A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 1am. Mostly cloudy, with a low around 67. Calm wind. Chance of precipitation is 70%.
Wednesday
Showers likely and possibly a thunderstorm. Mostly cloudy, with a high near 75. Southeast wind 3 to 7 mph.
Wednesday Night
A chance of showers and thunderstorms. Mostly cloudy, with a low around 64. North northeast wind 3 to 6 mph.
Thursday
A chance of showers and thunderstorms. Partly sunny, with a high near 74. North wind 6 to 8 mph.
Thursday Night
A chance of showers. Partly cloudy, with a low around 60. North northwest wind around 5 mph becoming calm in the evening.
Friday
A chance of showers. Mostly sunny, with a high near 75. North northwest wind 3 to 7 mph.
Friday Night
A slight chance of showers. Partly cloudy, with a low around 59. Light north northwest wind.
Saturday
A slight chance of showers. Mostly sunny, with a high near 76. Calm wind becoming north 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:
1:16 am CDT Sep 21, 2025
Forecast Valid:
1am CDT Sep 21, 2025-6pm CDT Sep 27, 2025
 
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