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.

Mostly Cloudy

58°F

14°C

Humidity 55%
Wind Speed N 15 G 22 mph
Barometer 29.87 in
Dewpoint 42°F (6°C)
Visibility 10.00 mi
Last update 22 Mar 8:35 pm CDT
Extended Forecast for

Marion IL

  • Tonight

    Tonight: A 30 percent chance of showers and thunderstorms, mainly before 10pm. Some of the storms could be severe. Mostly cloudy, then gradually becoming clear, with a low around 37. Southwest wind 14 to 16 mph becoming north after midnight. Winds could gust as high as 28 mph.

    Low: 37 °F

    Severe
    Thunderstorms
    then Mostly
    Clear

  • Monday

    Monday: Sunny, with a high near 57. North northeast wind 11 to 13 mph, with gusts as high as 22 mph.

    High: 57 °F

    Sunny

  • Monday Night

    Monday Night: Mostly cloudy, with a low around 39. Northeast wind around 6 mph.

    Low: 39 °F

    Mostly Cloudy

  • Tuesday

    Tuesday: Mostly sunny, with a high near 64. East southeast wind around 6 mph.

    High: 64 °F

    Mostly Sunny

  • Tuesday Night

    Tuesday Night: Partly cloudy, with a low around 44. Calm wind.

    Low: 44 °F

    Partly Cloudy

  • Wednesday

    Wednesday: Mostly sunny, with a high near 74. South southwest wind 3 to 8 mph.

    High: 74 °F

    Mostly Sunny

  • Wednesday Night

    Wednesday Night: Partly cloudy, with a low around 60. South wind 6 to 9 mph, with gusts as high as 18 mph.

    Low: 60 °F

    Partly Cloudy

  • Thursday

    Thursday: Sunny, with a high near 85. South southwest wind 9 to 15 mph, with gusts as high as 24 mph.

    High: 85 °F

    Sunny

  • Thursday Night

    Thursday Night: A chance of showers and thunderstorms. Partly cloudy, with a low around 45. South southwest wind 11 to 13 mph becoming north after midnight. Winds could gust as high as 22 mph.

    Low: 45 °F

    Chance
    Showers

Detailed Forecast

Tonight
A 30 percent chance of showers and thunderstorms, mainly before 10pm. Some of the storms could be severe. Mostly cloudy, then gradually becoming clear, with a low around 37. Southwest wind 14 to 16 mph becoming north after midnight. Winds could gust as high as 28 mph.
Monday
Sunny, with a high near 57. North northeast wind 11 to 13 mph, with gusts as high as 22 mph.
Monday Night
Mostly cloudy, with a low around 39. Northeast wind around 6 mph.
Tuesday
Mostly sunny, with a high near 64. East southeast wind around 6 mph.
Tuesday Night
Partly cloudy, with a low around 44. Calm wind.
Wednesday
Mostly sunny, with a high near 74. South southwest wind 3 to 8 mph.
Wednesday Night
Partly cloudy, with a low around 60. South wind 6 to 9 mph, with gusts as high as 18 mph.
Thursday
Sunny, with a high near 85. South southwest wind 9 to 15 mph, with gusts as high as 24 mph.
Thursday Night
A chance of showers and thunderstorms. Partly cloudy, with a low around 45. South southwest wind 11 to 13 mph becoming north after midnight. Winds could gust as high as 22 mph.
Friday
A chance of showers. Partly sunny, with a high near 56. North wind around 15 mph, with gusts as high as 23 mph.
Friday Night
A slight chance of showers. Partly cloudy, with a low around 32. North wind 7 to 11 mph, with gusts as high as 18 mph.
Saturday
Sunny, with a high near 58. Northeast wind 6 to 8 mph.
Saturday Night
Partly cloudy, with a low around 38. East northeast wind around 5 mph becoming light and variable in the evening.
Sunday
Mostly sunny, with a high near 66. South southwest wind 5 to 9 mph.
Basemap Options
Click map to change the forecast location
Loading map...
Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Marion IL
 37.73°N 88.92°W
Last Update:
8:21 pm CDT Mar 22, 2026
Forecast Valid:
8pm CDT Mar 22, 2026-6pm CDT Mar 29, 2026
 
Forecast Discussion
 
Get as KML Get as XML

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