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

63°F

17°C

Humidity 88%
Wind Speed SE 7 mph
Barometer 30.20 in
Dewpoint 59°F (15°C)
Visibility 10.00 mi
Last update 4 Oct 6:45 am CDT
Extended Forecast for

Carterville IL

  • Today

    Today: Sunny, with a high near 85. Light south wind becoming south southeast 5 to 9 mph in the morning.

    High: 85 °F

    Sunny

  • Tonight

    Tonight: Clear, with a low around 57. South southeast wind 3 to 5 mph.

    Low: 57 °F

    Clear

  • Sunday

    Sunday: Sunny, with a high near 86. South southeast wind 5 to 10 mph.

    High: 86 °F

    Sunny

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 64. South southeast wind 3 to 5 mph.

    Low: 64 °F

    Mostly Clear

  • Monday

    Monday: A chance of showers and thunderstorms. Mostly sunny, with a high near 83. South southeast wind 3 to 7 mph. Chance of precipitation is 50%.

    High: 83 °F

    Chance
    Showers

  • Monday Night

    Monday Night: A 50 percent chance of showers and thunderstorms. Partly cloudy, with a low around 65. Light south southeast wind.

    Low: 65 °F

    Chance
    Showers then
    Chance
    T-storms

  • Tuesday

    Tuesday: Showers likely and possibly a thunderstorm before 1pm, then a chance of showers and thunderstorms after 1pm. Mostly cloudy, with a high near 79. Calm wind becoming northwest 5 to 7 mph in the morning. Chance of precipitation is 60%.

    High: 79 °F

    Showers
    Likely

  • Tuesday Night

    Tuesday Night: A slight chance of showers. Mostly cloudy, with a low around 57. North wind 6 to 8 mph.

    Low: 57 °F

    Slight Chance
    Showers

  • Wednesday

    Wednesday: Mostly sunny, with a high near 73. North northeast wind 8 to 11 mph.

    High: 73 °F

    Mostly Sunny

Detailed Forecast

Today
Sunny, with a high near 85. Light south wind becoming south southeast 5 to 9 mph in the morning.
Tonight
Clear, with a low around 57. South southeast wind 3 to 5 mph.
Sunday
Sunny, with a high near 86. South southeast wind 5 to 10 mph.
Sunday Night
Mostly clear, with a low around 64. South southeast wind 3 to 5 mph.
Monday
A chance of showers and thunderstorms. Mostly sunny, with a high near 83. South southeast wind 3 to 7 mph. Chance of precipitation is 50%.
Monday Night
A 50 percent chance of showers and thunderstorms. Partly cloudy, with a low around 65. Light south southeast wind.
Tuesday
Showers likely and possibly a thunderstorm before 1pm, then a chance of showers and thunderstorms after 1pm. Mostly cloudy, with a high near 79. Calm wind becoming northwest 5 to 7 mph in the morning. Chance of precipitation is 60%.
Tuesday Night
A slight chance of showers. Mostly cloudy, with a low around 57. North wind 6 to 8 mph.
Wednesday
Mostly sunny, with a high near 73. North northeast wind 8 to 11 mph.
Wednesday Night
Mostly clear, with a low around 50. Northeast wind around 7 mph.
Thursday
Sunny, with a high near 72. East northeast wind around 7 mph.
Thursday Night
Mostly clear, with a low around 49. Light east wind.
Friday
Sunny, with a high near 76. Calm wind becoming south 5 to 7 mph in the afternoon.
Basemap Options
Click map to change the forecast location
Loading map...
Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Carterville IL
 37.76°N 89.09°W
Last Update:
4:45 am CDT Oct 4, 2025
Forecast Valid:
7am CDT Oct 4, 2025-6pm CDT Oct 10, 2025
 
Forecast Discussion
 
Get as KML Get as XML

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