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

69°F

21°C

Humidity 64%
Wind Speed S 6 mph
Barometer 29.82 in
Dewpoint 56°F (13°C)
Visibility 10.00 mi
Last update 21 Mar 8:55 pm CDT
Extended Forecast for

Benton IL

  • Tonight

    Tonight: Mostly clear, with a low around 63. Calm wind becoming south southwest 5 to 9 mph in the evening.

    Low: 63 °F

    Mostly Clear

  • Sunday

    Sunday: A 10 percent chance of showers and thunderstorms after 5pm. Mostly sunny, with a high near 84. South southwest wind 10 to 15 mph, with gusts as high as 24 mph.

    High: 84 °F

    Mostly Sunny
    then Slight
    Chance
    T-storms

  • Sunday Night

    Sunday Night: A chance of showers and thunderstorms before 7pm, then a chance of showers between 7pm and 1am. Mostly cloudy, then gradually becoming mostly clear, with a low around 39. North wind 13 to 16 mph, with gusts as high as 29 mph. Chance of precipitation is 30%.

    Low: 39 °F

    Chance
    Showers

  • Monday

    Monday: Mostly sunny, with a high near 58. North northeast wind around 10 mph, with gusts as high as 18 mph.

    High: 58 °F

    Mostly Sunny

  • Monday Night

    Monday Night: Mostly cloudy, with a low around 41. Northeast wind around 6 mph.

    Low: 41 °F

    Mostly Cloudy

  • Tuesday

    Tuesday: Partly sunny, with a high near 64. Southeast wind around 6 mph.

    High: 64 °F

    Partly Sunny

  • Tuesday Night

    Tuesday Night: Mostly cloudy, with a low around 45. Light east southeast wind.

    Low: 45 °F

    Mostly Cloudy

  • Wednesday

    Wednesday: Partly sunny, with a high near 72. Light south southeast wind becoming south 5 to 9 mph in the morning.

    High: 72 °F

    Partly Sunny

  • Wednesday Night

    Wednesday Night: A slight chance of showers and thunderstorms. Partly cloudy, with a low around 57. South southwest wind 6 to 8 mph.

    Low: 57 °F

    Slight Chance
    T-storms

Detailed Forecast

Tonight
Mostly clear, with a low around 63. Calm wind becoming south southwest 5 to 9 mph in the evening.
Sunday
A 10 percent chance of showers and thunderstorms after 5pm. Mostly sunny, with a high near 84. South southwest wind 10 to 15 mph, with gusts as high as 24 mph.
Sunday Night
A chance of showers and thunderstorms before 7pm, then a chance of showers between 7pm and 1am. Mostly cloudy, then gradually becoming mostly clear, with a low around 39. North wind 13 to 16 mph, with gusts as high as 29 mph. Chance of precipitation is 30%.
Monday
Mostly sunny, with a high near 58. North northeast wind around 10 mph, with gusts as high as 18 mph.
Monday Night
Mostly cloudy, with a low around 41. Northeast wind around 6 mph.
Tuesday
Partly sunny, with a high near 64. Southeast wind around 6 mph.
Tuesday Night
Mostly cloudy, with a low around 45. Light east southeast wind.
Wednesday
Partly sunny, with a high near 72. Light south southeast wind becoming south 5 to 9 mph in the morning.
Wednesday Night
A slight chance of showers and thunderstorms. Partly cloudy, with a low around 57. South southwest wind 6 to 8 mph.
Thursday
A slight chance of showers and thunderstorms after 1pm. Sunny, with a high near 83. Southwest wind 9 to 14 mph, with gusts as high as 22 mph.
Thursday Night
A chance of showers and thunderstorms. Partly cloudy, with a low around 48. South southwest wind around 11 mph becoming north after midnight. Winds could gust as high as 22 mph.
Friday
A chance of showers. Partly sunny, with a high near 59. North northeast wind 11 to 13 mph, with gusts as high as 20 mph.
Friday Night
A chance of showers. Mostly cloudy, with a low around 38. North northeast wind 7 to 10 mph.
Saturday
A slight chance of showers. Partly sunny, with a high near 58. Northeast wind 7 to 9 mph.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Benton IL
 38°N 88.93°W
Last Update:
8:41 pm CDT Mar 21, 2026
Forecast Valid:
9pm CDT Mar 21, 2026-6pm CDT Mar 28, 2026
 
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Additional Resources

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Hourly Weather Forecast

National Digital Forecast Database

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High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation