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

65°F

18°C

Humidity 46%
Wind Speed S 8 mph
Barometer 30.19 in
Dewpoint 43°F (6°C)
Visibility 10.00 mi
Last update 9 Apr 10:55 pm CDT
Extended Forecast for

Marion IL

  • Tonight

    Tonight: Mostly clear, with a low around 57. South wind around 8 mph.

    Low: 57 °F

    Mostly Clear

  • Friday

    Friday: A 40 percent chance of showers and thunderstorms, mainly after 4pm. Mostly sunny, with a high near 79. South wind 8 to 14 mph becoming west in the afternoon. Winds could gust as high as 21 mph.

    High: 79 °F

    Mostly Sunny
    then Chance
    T-storms

  • Friday Night

    Friday Night: A chance of showers and thunderstorms before 1am, then a slight chance of showers. Mostly cloudy, with a low around 54. North wind around 6 mph becoming calm in the evening. Chance of precipitation is 40%.

    Low: 54 °F

    Chance
    T-storms then
    Chance
    Showers

  • Saturday

    Saturday: A 20 percent chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 80. East northeast wind around 5 mph becoming south southeast in the afternoon.

    High: 80 °F

    Partly Sunny
    then Slight
    Chance
    T-storms

  • Saturday Night

    Saturday Night: Partly cloudy, with a low around 60. Southeast wind 3 to 6 mph.

    Low: 60 °F

    Partly Cloudy

  • Sunday

    Sunday: Partly sunny, with a high near 82. South southwest wind 6 to 11 mph increasing to 12 to 17 mph in the afternoon. Winds could gust as high as 28 mph.

    High: 82 °F

    Partly Sunny

  • Sunday Night

    Sunday Night: A slight chance of showers, then a chance of showers and thunderstorms after 1am. Mostly cloudy, with a low around 66. South southwest wind around 14 mph, with gusts as high as 24 mph. Chance of precipitation is 50%.

    Low: 66 °F

    Slight Chance
    Showers then
    Chance
    T-storms

  • Monday

    Monday: A chance of showers and thunderstorms, mainly before 1pm. Mostly cloudy, with a high near 83. South southwest wind 14 to 17 mph, with gusts as high as 28 mph.

    High: 83 °F

    Chance
    Showers

  • Monday Night

    Monday Night: Partly cloudy, with a low around 69. South southwest wind 11 to 14 mph, with gusts as high as 23 mph.

    Low: 69 °F

    Partly Cloudy

Detailed Forecast

Tonight
Mostly clear, with a low around 57. South wind around 8 mph.
Friday
A 40 percent chance of showers and thunderstorms, mainly after 4pm. Mostly sunny, with a high near 79. South wind 8 to 14 mph becoming west in the afternoon. Winds could gust as high as 21 mph.
Friday Night
A chance of showers and thunderstorms before 1am, then a slight chance of showers. Mostly cloudy, with a low around 54. North wind around 6 mph becoming calm in the evening. Chance of precipitation is 40%.
Saturday
A 20 percent chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 80. East northeast wind around 5 mph becoming south southeast in the afternoon.
Saturday Night
Partly cloudy, with a low around 60. Southeast wind 3 to 6 mph.
Sunday
Partly sunny, with a high near 82. South southwest wind 6 to 11 mph increasing to 12 to 17 mph in the afternoon. Winds could gust as high as 28 mph.
Sunday Night
A slight chance of showers, then a chance of showers and thunderstorms after 1am. Mostly cloudy, with a low around 66. South southwest wind around 14 mph, with gusts as high as 24 mph. Chance of precipitation is 50%.
Monday
A chance of showers and thunderstorms, mainly before 1pm. Mostly cloudy, with a high near 83. South southwest wind 14 to 17 mph, with gusts as high as 28 mph.
Monday Night
Partly cloudy, with a low around 69. South southwest wind 11 to 14 mph, with gusts as high as 23 mph.
Tuesday
A slight chance of showers and thunderstorms after 1pm. Partly sunny, with a high near 86. South southwest wind 11 to 17 mph, with gusts as high as 29 mph.
Tuesday Night
A chance of showers and thunderstorms. Mostly cloudy, with a low around 67. South wind 11 to 13 mph, with gusts as high as 23 mph.
Wednesday
A chance of showers and thunderstorms. Partly sunny, with a high near 84. South southwest wind 13 to 16 mph, with gusts as high as 26 mph.
Wednesday Night
A chance of showers and thunderstorms. Mostly cloudy, with a low around 62. South southwest wind 7 to 10 mph, with gusts as high as 18 mph.
Thursday
A chance of showers and thunderstorms. Partly sunny, with a high near 80. Southwest wind 6 to 10 mph.
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ABOUT THIS FORECAST

 
Point Forecast:
Marion IL
 37.73°N 88.92°W
Last Update:
9:46 pm CDT Apr 9, 2026
Forecast Valid:
11pm CDT Apr 9, 2026-6pm CDT Apr 16, 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