National Oceanic and Atmospheric Administration National Weather Service United States Department of Commerce

Hazardous Weather Conditions

Current conditions at

Marion - Williamson County Regional Airport (KMWA)

Lat: 37.77°NLon: 89.01°WElev: 486ft.

Fair

76°F

24°C

Humidity 52%
Wind Speed S 14 mph
Barometer 29.95 in
Dewpoint 57°F (14°C)
Visibility 10.00 mi
Heat Index78°F (26°C)
Last update 17 May 11:15 pm CDT
Extended Forecast for

Benton IL

Lake Wind Advisory May 18, 11:00am until May 18, 04:00pm
Click here for hazard details and duration
Lake Wind Advisory

  • Overnight

    Overnight: Partly cloudy, with a low around 72. South wind 6 to 10 mph, with gusts as high as 21 mph.

    Low: 72 °F

    Partly Cloudy

  • Monday

    Monday: A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 3pm. Partly sunny, with a high near 87. South southwest wind 11 to 17 mph, with gusts as high as 28 mph. Chance of precipitation is 70%.

    High: 87 °F

    Chance
    Showers then
    Showers
    Likely

  • Monday Night

    Monday Night: A 30 percent chance of showers and thunderstorms, mainly before 7pm. Partly cloudy, with a low around 72. South wind 10 to 13 mph, with gusts as high as 23 mph.

    Low: 72 °F

    Chance
    Showers then
    Mostly Clear

  • Tuesday

    Tuesday: A chance of showers and thunderstorms before noon, then showers likely and possibly a thunderstorm between noon and 4pm, then showers and thunderstorms likely after 4pm. Increasing clouds, with a high near 87. South southwest wind 14 to 17 mph, with gusts as high as 25 mph. Chance of precipitation is 70%.

    High: 87 °F

    T-storms
    Likely

  • Tuesday Night

    Tuesday Night: Showers and possibly a thunderstorm. Low around 62. Light and variable wind becoming north northwest 5 to 8 mph after midnight. Chance of precipitation is 90%.

    Low: 62 °F

    T-storms then
    Showers

  • Wednesday

    Wednesday: A 50 percent chance of showers, mainly before 1pm. Mostly cloudy, with a high near 73. North wind around 10 mph.

    High: 73 °F

    Chance
    Showers

  • Wednesday Night

    Wednesday Night: A 20 percent chance of showers. Mostly cloudy, with a low around 54. Northeast wind 6 to 8 mph.

    Low: 54 °F

    Slight Chance
    Showers

  • Thursday

    Thursday: Partly sunny, with a high near 74. East northeast wind around 8 mph.

    High: 74 °F

    Partly Sunny

  • Thursday Night

    Thursday Night: A chance of showers after 1am. Mostly cloudy, with a low around 58. East wind 3 to 6 mph.

    Low: 58 °F

    Mostly Cloudy
    then Chance
    Showers

Detailed Forecast

Overnight
Partly cloudy, with a low around 72. South wind 6 to 10 mph, with gusts as high as 21 mph.
Monday
A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 3pm. Partly sunny, with a high near 87. South southwest wind 11 to 17 mph, with gusts as high as 28 mph. Chance of precipitation is 70%.
Monday Night
A 30 percent chance of showers and thunderstorms, mainly before 7pm. Partly cloudy, with a low around 72. South wind 10 to 13 mph, with gusts as high as 23 mph.
Tuesday
A chance of showers and thunderstorms before noon, then showers likely and possibly a thunderstorm between noon and 4pm, then showers and thunderstorms likely after 4pm. Increasing clouds, with a high near 87. South southwest wind 14 to 17 mph, with gusts as high as 25 mph. Chance of precipitation is 70%.
Tuesday Night
Showers and possibly a thunderstorm. Low around 62. Light and variable wind becoming north northwest 5 to 8 mph after midnight. Chance of precipitation is 90%.
Wednesday
A 50 percent chance of showers, mainly before 1pm. Mostly cloudy, with a high near 73. North wind around 10 mph.
Wednesday Night
A 20 percent chance of showers. Mostly cloudy, with a low around 54. Northeast wind 6 to 8 mph.
Thursday
Partly sunny, with a high near 74. East northeast wind around 8 mph.
Thursday Night
A chance of showers after 1am. Mostly cloudy, with a low around 58. East wind 3 to 6 mph.
Friday
A chance of showers, with thunderstorms also possible after 1pm. Mostly cloudy, with a high near 77. East southeast wind around 6 mph becoming west southwest in the afternoon.
Friday Night
A chance of showers and thunderstorms. Mostly cloudy, with a low around 62. Southeast wind around 5 mph becoming calm in the evening.
Saturday
A chance of showers and thunderstorms. Partly sunny, with a high near 82. Calm wind becoming east around 5 mph in the morning.
Saturday Night
A chance of showers and thunderstorms. Mostly cloudy, with a low around 64. Light south southwest wind.
Sunday
A chance of showers and thunderstorms. Mostly sunny, with a high near 86. Calm wind becoming south around 6 mph in the morning.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Benton IL
 38°N 88.93°W
Last Update:
12:56 am CDT May 18, 2026
Forecast Valid:
1am CDT May 18, 2026-6pm CDT May 24, 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