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.

N/A

Humidity NA
Wind Speed NA
Barometer NA
Dewpoint N/A
Visibility NA
Last update *** Not a current observation ***
Extended Forecast for

Carterville IL

  • Tonight

    Tonight: Increasing clouds, with a low around 60. South southwest wind 8 to 10 mph, with gusts as high as 20 mph.

    Low: 60 °F

    Increasing
    Clouds

  • Saturday

    Saturday: Mostly cloudy, then gradually becoming sunny, with a high near 75. Southwest wind 10 to 15 mph, with gusts as high as 23 mph.

    High: 75 °F

    Decreasing
    Clouds

  • Saturday Night

    Saturday Night: Mostly clear, with a low around 47. Southwest wind 6 to 8 mph becoming north after midnight.

    Low: 47 °F

    Mostly Clear

  • Sunday

    Sunday: Sunny, with a high near 60. North wind 3 to 7 mph.

    High: 60 °F

    Sunny

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 36. Calm wind.

    Low: 36 °F

    Mostly Clear

  • Monday

    Monday: A 30 percent chance of showers after noon. Mostly sunny, with a high near 60. Calm wind becoming east southeast 5 to 9 mph in the morning.

    High: 60 °F

    Sunny then
    Chance
    Showers

  • Monday Night

    Monday Night: Showers likely. Mostly cloudy, with a low around 48. East southeast wind 6 to 9 mph. Chance of precipitation is 70%.

    Low: 48 °F

    Showers
    Likely

  • Tuesday

    Tuesday: A chance of showers before noon. Partly sunny, with a high near 65. South southeast wind 7 to 10 mph becoming north northwest in the afternoon.

    High: 65 °F

    Chance
    Showers then
    Partly Sunny

  • Tuesday Night

    Tuesday Night: A slight chance of showers. Mostly cloudy, with a low around 41. North wind around 6 mph becoming calm in the evening.

    Low: 41 °F

    Slight Chance
    Showers

Detailed Forecast

Tonight
Increasing clouds, with a low around 60. South southwest wind 8 to 10 mph, with gusts as high as 20 mph.
Saturday
Mostly cloudy, then gradually becoming sunny, with a high near 75. Southwest wind 10 to 15 mph, with gusts as high as 23 mph.
Saturday Night
Mostly clear, with a low around 47. Southwest wind 6 to 8 mph becoming north after midnight.
Sunday
Sunny, with a high near 60. North wind 3 to 7 mph.
Sunday Night
Mostly clear, with a low around 36. Calm wind.
Monday
A 30 percent chance of showers after noon. Mostly sunny, with a high near 60. Calm wind becoming east southeast 5 to 9 mph in the morning.
Monday Night
Showers likely. Mostly cloudy, with a low around 48. East southeast wind 6 to 9 mph. Chance of precipitation is 70%.
Tuesday
A chance of showers before noon. Partly sunny, with a high near 65. South southeast wind 7 to 10 mph becoming north northwest in the afternoon.
Tuesday Night
A slight chance of showers. Mostly cloudy, with a low around 41. North wind around 6 mph becoming calm in the evening.
Wednesday
A chance of showers. Partly sunny, with a high near 59. Light and variable wind becoming east southeast 5 to 7 mph in the morning.
Wednesday Night
A chance of showers. Mostly cloudy, with a low around 47. South southeast wind 3 to 7 mph.
Thursday
Showers likely. Mostly cloudy, with a high near 65. South southwest wind 7 to 10 mph.
Thursday Night
Showers likely. Mostly cloudy, with a low around 47. South wind around 8 mph.
Friday
A chance of showers. Partly sunny, with a high near 62. South southwest wind 8 to 11 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:
7:47 pm CST Nov 14, 2025
Forecast Valid:
11pm CST Nov 14, 2025-6pm CST Nov 21, 2025
 
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Additional Resources

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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