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.

Fog/Mist

37°F

3°C

Humidity 100%
Wind Speed E 6 mph
Barometer 30.25 in
Dewpoint 37°F (3°C)
Visibility 4.00 mi
Wind Chill32°F (0°C)
Last update 2 Mar 9:45 am CST
Extended Forecast for

Marion IL

  • Today

    Today: A 20 percent chance of showers between noon and 3pm. Cloudy, with a high near 47. East northeast wind 5 to 9 mph.

    High: 47 °F

    Slight Chance
    Showers

  • Tonight

    Tonight: Showers likely, mainly after 5am. Mostly cloudy, with a low around 42. Light east northeast wind. Chance of precipitation is 60%.

    Low: 42 °F

    Mostly Cloudy
    then Showers
    Likely

  • Tuesday

    Tuesday: Showers likely, mainly before noon. Mostly cloudy, with a high near 71. East southeast wind 5 to 13 mph becoming south southwest in the morning. Winds could gust as high as 21 mph. Chance of precipitation is 60%.

    High: 71 °F

    Showers
    Likely then
    Chance
    Showers

  • Tuesday Night

    Tuesday Night: A 40 percent chance of showers. Mostly cloudy, with a low around 58. South wind 6 to 8 mph.

    Low: 58 °F

    Chance
    Showers

  • Wednesday

    Wednesday: Showers likely and possibly a thunderstorm. Mostly cloudy, with a high near 74. South southwest wind 8 to 13 mph, with gusts as high as 22 mph. Chance of precipitation is 60%.

    High: 74 °F

    Showers
    Likely

  • Wednesday Night

    Wednesday Night: A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after midnight. Mostly cloudy, with a low around 60. South wind 8 to 10 mph, with gusts as high as 20 mph. Chance of precipitation is 70%.

    Low: 60 °F

    Chance
    T-storms then
    Showers
    Likely

  • Thursday

    Thursday: Showers. High near 72. Southwest wind 7 to 13 mph, with gusts as high as 21 mph. Chance of precipitation is 80%.

    High: 72 °F

    Showers

  • Thursday Night

    Thursday Night: A chance of showers, then showers likely and possibly a thunderstorm after midnight. Mostly cloudy, with a low around 60. South wind around 7 mph.

    Low: 60 °F

    Showers
    Likely

  • Friday

    Friday: A chance of showers and thunderstorms before noon, then a slight chance of showers. Partly sunny, with a high near 78. South southwest wind 8 to 15 mph, with gusts as high as 24 mph.

    High: 78 °F

    Chance
    Showers

Detailed Forecast

Today
A 20 percent chance of showers between noon and 3pm. Cloudy, with a high near 47. East northeast wind 5 to 9 mph.
Tonight
Showers likely, mainly after 5am. Mostly cloudy, with a low around 42. Light east northeast wind. Chance of precipitation is 60%.
Tuesday
Showers likely, mainly before noon. Mostly cloudy, with a high near 71. East southeast wind 5 to 13 mph becoming south southwest in the morning. Winds could gust as high as 21 mph. Chance of precipitation is 60%.
Tuesday Night
A 40 percent chance of showers. Mostly cloudy, with a low around 58. South wind 6 to 8 mph.
Wednesday
Showers likely and possibly a thunderstorm. Mostly cloudy, with a high near 74. South southwest wind 8 to 13 mph, with gusts as high as 22 mph. Chance of precipitation is 60%.
Wednesday Night
A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after midnight. Mostly cloudy, with a low around 60. South wind 8 to 10 mph, with gusts as high as 20 mph. Chance of precipitation is 70%.
Thursday
Showers. High near 72. Southwest wind 7 to 13 mph, with gusts as high as 21 mph. Chance of precipitation is 80%.
Thursday Night
A chance of showers, then showers likely and possibly a thunderstorm after midnight. Mostly cloudy, with a low around 60. South wind around 7 mph.
Friday
A chance of showers and thunderstorms before noon, then a slight chance of showers. Partly sunny, with a high near 78. South southwest wind 8 to 15 mph, with gusts as high as 24 mph.
Friday Night
A chance of showers, then showers likely and possibly a thunderstorm after midnight. Mostly cloudy, with a low around 59. South wind around 10 mph, with gusts as high as 20 mph.
Saturday
Showers and possibly a thunderstorm. Cloudy, with a high near 71. Southwest wind 7 to 10 mph, with gusts as high as 18 mph.
Saturday Night
A chance of showers. Cloudy, with a low around 50. West wind around 6 mph becoming light and variable in the evening.
Sunday
A chance of showers. Mostly cloudy, with a high near 66. Light and variable wind becoming south 5 to 8 mph in the morning.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Marion IL
 37.73°N 88.92°W
Last Update:
6:51 am CST Mar 2, 2026
Forecast Valid:
10am CST Mar 2, 2026-6pm CDT Mar 8, 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