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.

Overcast

64°F

18°C

Humidity 84%
Wind Speed NE 3 mph
Barometer 30.06 in
Dewpoint 59°F (15°C)
Visibility 10.00 mi
Last update 21 May 8:35 pm CDT
Extended Forecast for

Benton IL

  • Tonight

    Tonight: Mostly cloudy, with a low around 58. East northeast wind 5 to 7 mph.

    Low: 58 °F

    Mostly Cloudy

  • Friday

    Friday: A chance of showers before 1pm, then showers likely and possibly a thunderstorm between 1pm and 4pm, then a chance of showers and thunderstorms after 4pm. Cloudy, with a high near 73. East northeast wind around 8 mph. Chance of precipitation is 70%.

    High: 73 °F

    Showers
    Likely

  • Friday Night

    Friday Night: A chance of showers and thunderstorms. Mostly cloudy, with a low around 60. East northeast wind around 6 mph becoming calm in the evening. Chance of precipitation is 50%.

    Low: 60 °F

    Chance
    T-storms then
    Chance
    Showers

  • Saturday

    Saturday: Cloudy, then gradually becoming mostly sunny, with a high near 80. West northwest wind 3 to 5 mph.

    High: 80 °F

    Decreasing
    Clouds

  • Saturday Night

    Saturday Night: A 20 percent chance of showers before 1am. Partly cloudy, with a low around 61. Calm wind.

    Low: 61 °F

    Slight Chance
    Showers

  • Sunday

    Sunday: A chance of showers, with thunderstorms also possible after 1pm. Mostly cloudy, with a high near 82. Calm wind. Chance of precipitation is 50%.

    High: 82 °F

    Chance
    Showers then
    Chance
    T-storms

  • Sunday Night

    Sunday Night: A slight chance of showers and thunderstorms, then a chance of showers after 1am. Mostly cloudy, with a low around 63. Calm wind. Chance of precipitation is 30%.

    Low: 63 °F

    Slight Chance
    T-storms then
    Chance
    Showers

  • Memorial Day

    Memorial Day: A chance of showers and thunderstorms. Mostly cloudy, with a high near 81. Calm wind becoming east around 6 mph in the afternoon.

    High: 81 °F

    Chance
    Showers then
    Chance
    T-storms

  • Monday Night

    Monday Night: A chance of showers and thunderstorms, mainly after 1am. Mostly cloudy, with a low around 65. Light east wind.

    Low: 65 °F

    Slight Chance
    T-storms then
    Chance
    Showers

Detailed Forecast

Tonight
Mostly cloudy, with a low around 58. East northeast wind 5 to 7 mph.
Friday
A chance of showers before 1pm, then showers likely and possibly a thunderstorm between 1pm and 4pm, then a chance of showers and thunderstorms after 4pm. Cloudy, with a high near 73. East northeast wind around 8 mph. Chance of precipitation is 70%.
Friday Night
A chance of showers and thunderstorms. Mostly cloudy, with a low around 60. East northeast wind around 6 mph becoming calm in the evening. Chance of precipitation is 50%.
Saturday
Cloudy, then gradually becoming mostly sunny, with a high near 80. West northwest wind 3 to 5 mph.
Saturday Night
A 20 percent chance of showers before 1am. Partly cloudy, with a low around 61. Calm wind.
Sunday
A chance of showers, with thunderstorms also possible after 1pm. Mostly cloudy, with a high near 82. Calm wind. Chance of precipitation is 50%.
Sunday Night
A slight chance of showers and thunderstorms, then a chance of showers after 1am. Mostly cloudy, with a low around 63. Calm wind. Chance of precipitation is 30%.
Memorial Day
A chance of showers and thunderstorms. Mostly cloudy, with a high near 81. Calm wind becoming east around 6 mph in the afternoon.
Monday Night
A chance of showers and thunderstorms, mainly after 1am. Mostly cloudy, with a low around 65. Light east wind.
Tuesday
A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 1pm. Partly sunny, with a high near 82. East wind 5 to 7 mph.
Tuesday Night
A chance of showers and thunderstorms. Mostly cloudy, with a low around 66. Southeast wind 3 to 7 mph.
Wednesday
Showers and thunderstorms likely. Partly sunny, with a high near 84. South southeast wind 5 to 8 mph.
Wednesday Night
A chance of showers and thunderstorms. Partly cloudy, with a low around 67. South southeast wind around 6 mph becoming calm in the evening.
Thursday
A chance of showers and thunderstorms. Mostly sunny, with a high near 86. Southeast wind 3 to 6 mph.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Benton IL
 38.02°N 88.9°W
Last Update:
7:56 pm CDT May 21, 2026
Forecast Valid:
8pm CDT May 21, 2026-6pm CDT May 28, 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