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.

Partly Cloudy

32°F

0°C

Humidity 55%
Wind Speed E 6 mph
Barometer 30.37 in
Dewpoint 18°F (-8°C)
Visibility 10.00 mi
Wind Chill26°F (-3°C)
Last update 7 Feb 5:45 pm CST
Extended Forecast for

Marion IL

  • Tonight

    Tonight: Mostly cloudy, with a low around 26. Southeast wind 5 to 7 mph.

    Low: 26 °F

    Mostly Cloudy

  • Sunday

    Sunday: Partly sunny, with a high near 48. Southeast wind 5 to 8 mph.

    High: 48 °F

    Partly Sunny

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 30. East wind around 5 mph becoming calm in the evening.

    Low: 30 °F

    Mostly Clear

  • Monday

    Monday: Sunny, with a high near 57. Light and variable wind.

    High: 57 °F

    Sunny

  • Monday Night

    Monday Night: Mostly clear, with a low around 40. Calm wind becoming south southwest around 6 mph after midnight.

    Low: 40 °F

    Mostly Clear

  • Tuesday

    Tuesday: A 20 percent chance of showers after noon. Mostly sunny, with a high near 65. South southwest wind 5 to 8 mph becoming north northwest in the afternoon.

    High: 65 °F

    Mostly Sunny
    then Slight
    Chance
    Showers

  • Tuesday Night

    Tuesday Night: Showers likely. Mostly cloudy, with a low around 40. North northeast wind around 6 mph. Chance of precipitation is 70%.

    Low: 40 °F

    Showers
    Likely

  • Wednesday

    Wednesday: A chance of showers, mainly before noon. Mostly cloudy, with a high near 50. Northeast wind 6 to 8 mph.

    High: 50 °F

    Chance
    Showers

  • Wednesday Night

    Wednesday Night: A slight chance of showers. Mostly cloudy, with a low around 37. East northeast wind 3 to 5 mph.

    Low: 37 °F

    Slight Chance
    Showers

Detailed Forecast

Tonight
Mostly cloudy, with a low around 26. Southeast wind 5 to 7 mph.
Sunday
Partly sunny, with a high near 48. Southeast wind 5 to 8 mph.
Sunday Night
Mostly clear, with a low around 30. East wind around 5 mph becoming calm in the evening.
Monday
Sunny, with a high near 57. Light and variable wind.
Monday Night
Mostly clear, with a low around 40. Calm wind becoming south southwest around 6 mph after midnight.
Tuesday
A 20 percent chance of showers after noon. Mostly sunny, with a high near 65. South southwest wind 5 to 8 mph becoming north northwest in the afternoon.
Tuesday Night
Showers likely. Mostly cloudy, with a low around 40. North northeast wind around 6 mph. Chance of precipitation is 70%.
Wednesday
A chance of showers, mainly before noon. Mostly cloudy, with a high near 50. Northeast wind 6 to 8 mph.
Wednesday Night
A slight chance of showers. Mostly cloudy, with a low around 37. East northeast wind 3 to 5 mph.
Thursday
A chance of showers, mainly after noon. Mostly cloudy, with a high near 47. East northeast wind 5 to 7 mph.
Thursday Night
A chance of showers. Mostly cloudy, with a low around 32. Northeast wind 3 to 5 mph.
Friday
A slight chance of showers. Partly sunny, with a high near 48. Northeast wind 5 to 8 mph.
Friday Night
A chance of showers. Mostly cloudy, with a low around 30. East northeast wind around 6 mph.
Saturday
A chance of showers. Mostly cloudy, with a high near 44. East northeast wind 6 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 88.95°W
Last Update:
3:22 pm CST Feb 7, 2026
Forecast Valid:
6pm CST Feb 7, 2026-6pm CST Feb 14, 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