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

82°F

28°C

Humidity 40%
Wind Speed S 6 mph
Barometer 29.98 in
Dewpoint 55°F (13°C)
Visibility 10.00 mi
Heat Index81°F (27°C)
Last update 11 Oct 3:45 pm CDT
Extended Forecast for

Benton IL

  • This Afternoon

    This Afternoon: Sunny, with a high near 84. West northwest wind around 6 mph.

    High: 84 °F

    Sunny

  • Tonight

    Tonight: Mostly clear, with a low around 61. Calm wind becoming south southwest around 5 mph after midnight.

    Low: 61 °F

    Mostly Clear

  • Columbus Day

    Columbus Day: Partly sunny, then gradually becoming sunny, with a high near 92. Southwest wind 5 to 14 mph, with gusts as high as 18 mph.

    High: 92 °F

    Becoming
    Sunny

  • Monday Night

    Monday Night: Clear, with a low around 66. South southwest wind around 8 mph.

    Low: 66 °F

    Clear

  • Tuesday

    Tuesday: Sunny, with a high near 93. Southwest wind 7 to 13 mph.

    High: 93 °F

    Sunny

  • Tuesday Night

    Tuesday Night: A 30 percent chance of showers and thunderstorms after 1am. Mostly clear, with a low around 70. South southwest wind 5 to 7 mph.

    Low: 70 °F

    Mostly Clear
    then Chance
    Showers

  • Wednesday

    Wednesday: Showers and possibly a thunderstorm. High near 86. Southwest wind 3 to 8 mph. Chance of precipitation is 80%.

    High: 86 °F

    Showers

  • Wednesday Night

    Wednesday Night: Showers likely and possibly a thunderstorm. Mostly cloudy, with a low around 65. Calm wind.

    Low: 65 °F

    Showers
    Likely

  • Thursday

    Thursday: Showers likely, with thunderstorms also possible after 1pm. Mostly cloudy, with a high near 81. East northeast wind 5 to 11 mph becoming south southeast in the afternoon.

    High: 81 °F

    Showers
    Likely

Detailed Forecast

This Afternoon
Sunny, with a high near 84. West northwest wind around 6 mph.
Tonight
Mostly clear, with a low around 61. Calm wind becoming south southwest around 5 mph after midnight.
Columbus Day
Partly sunny, then gradually becoming sunny, with a high near 92. Southwest wind 5 to 14 mph, with gusts as high as 18 mph.
Monday Night
Clear, with a low around 66. South southwest wind around 8 mph.
Tuesday
Sunny, with a high near 93. Southwest wind 7 to 13 mph.
Tuesday Night
A 30 percent chance of showers and thunderstorms after 1am. Mostly clear, with a low around 70. South southwest wind 5 to 7 mph.
Wednesday
Showers and possibly a thunderstorm. High near 86. Southwest wind 3 to 8 mph. Chance of precipitation is 80%.
Wednesday Night
Showers likely and possibly a thunderstorm. Mostly cloudy, with a low around 65. Calm wind.
Thursday
Showers likely, with thunderstorms also possible after 1pm. Mostly cloudy, with a high near 81. East northeast wind 5 to 11 mph becoming south southeast in the afternoon.
Thursday Night
A chance of showers and thunderstorms. Mostly cloudy, with a low around 56. West northwest wind 6 to 13 mph.
Friday
Partly sunny, with a high near 69. Breezy, with a northwest wind 17 to 23 mph, with gusts as high as 28 mph.
Friday Night
Mostly clear, with a low around 39. Breezy, with a north northwest wind 11 to 21 mph, with gusts as high as 24 mph.
Saturday
Sunny, with a high near 61. North wind 11 to 15 mph.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Benton IL
 38°N 88.9°W
Last Update:
2:01 pm CDT Oct 11, 2026
Forecast Valid:
4pm CDT Oct 11, 2026-6pm CDT Oct 17, 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