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.

Partly Cloudy

86°F

30°C

Humidity 43%
Wind Speed SW 8 mph
Barometer 29.98 in
Dewpoint 61°F (16°C)
Visibility 10.00 mi
Heat Index86°F (30°C)
Last update 20 Jun 2:45 pm CDT
Extended Forecast for

Benton IL

  • This Afternoon

    This Afternoon: Sunny, with a high near 89. Light west northwest wind.

    High: 89 °F

    Sunny

  • Tonight

    Tonight: Partly cloudy, with a low around 67. Light and variable wind.

    Low: 67 °F

    Partly Cloudy

  • Sunday

    Sunday: A chance of showers and thunderstorms before 2pm, then showers likely and possibly a thunderstorm between 2pm and 4pm, then a chance of showers and thunderstorms after 4pm. Increasing clouds, with a high near 89. Breezy, with a south wind 5 to 10 mph increasing to 15 to 20 mph in the afternoon. Winds could gust as high as 28 mph. Chance of precipitation is 70%.

    High: 89 °F

    Chance
    T-storms then
    Showers
    Likely and
    Breezy

  • Sunday Night

    Sunday Night: Showers and thunderstorms before 3am, then showers and possibly a thunderstorm, mainly after 3am. Some of the storms could produce heavy rainfall. Low around 70. Southwest wind 11 to 18 mph, with gusts as high as 25 mph. Chance of precipitation is 100%.

    Low: 70 °F

    Heavy Rain
    then Showers

  • Monday

    Monday: A chance of showers and thunderstorms before 10am, then a chance of showers between 10am and 1pm. Mostly cloudy, with a high near 81. West southwest wind around 11 mph becoming north northwest in the afternoon. Chance of precipitation is 30%.

    High: 81 °F

    Chance
    Showers

  • Monday Night

    Monday Night: Partly cloudy, with a low around 63. North wind 5 to 10 mph becoming light in the evening.

    Low: 63 °F

    Partly Cloudy

  • Tuesday

    Tuesday: Mostly sunny, with a high near 82. Light northeast wind.

    High: 82 °F

    Mostly Sunny

  • Tuesday Night

    Tuesday Night: Mostly clear, with a low around 64. Calm wind.

    Low: 64 °F

    Mostly Clear

  • Wednesday

    Wednesday: Mostly sunny, with a high near 85. Calm wind becoming west around 5 mph in the afternoon.

    High: 85 °F

    Mostly Sunny

Detailed Forecast

This Afternoon
Sunny, with a high near 89. Light west northwest wind.
Tonight
Partly cloudy, with a low around 67. Light and variable wind.
Sunday
A chance of showers and thunderstorms before 2pm, then showers likely and possibly a thunderstorm between 2pm and 4pm, then a chance of showers and thunderstorms after 4pm. Increasing clouds, with a high near 89. Breezy, with a south wind 5 to 10 mph increasing to 15 to 20 mph in the afternoon. Winds could gust as high as 28 mph. Chance of precipitation is 70%.
Sunday Night
Showers and thunderstorms before 3am, then showers and possibly a thunderstorm, mainly after 3am. Some of the storms could produce heavy rainfall. Low around 70. Southwest wind 11 to 18 mph, with gusts as high as 25 mph. Chance of precipitation is 100%.
Monday
A chance of showers and thunderstorms before 10am, then a chance of showers between 10am and 1pm. Mostly cloudy, with a high near 81. West southwest wind around 11 mph becoming north northwest in the afternoon. Chance of precipitation is 30%.
Monday Night
Partly cloudy, with a low around 63. North wind 5 to 10 mph becoming light in the evening.
Tuesday
Mostly sunny, with a high near 82. Light northeast wind.
Tuesday Night
Mostly clear, with a low around 64. Calm wind.
Wednesday
Mostly sunny, with a high near 85. Calm wind becoming west around 5 mph in the afternoon.
Wednesday Night
Partly cloudy, with a low around 64. Light and variable wind.
Thursday
Mostly sunny, with a high near 84. Calm wind becoming west northwest around 6 mph in the afternoon.
Thursday Night
A slight chance of showers. Partly cloudy, with a low around 64. Light north wind.
Friday
A chance of showers and thunderstorms. Mostly sunny, with a high near 86. Light and variable wind.
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ABOUT THIS FORECAST

 
Point Forecast:
Benton IL
 38°N 88.93°W
Last Update:
2:11 pm CDT Jun 20, 2026
Forecast Valid:
3pm CDT Jun 20, 2026-6pm CDT Jun 26, 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