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.

Overcast

27°F

-3°C

Humidity 62%
Wind Speed SW 6 mph
Barometer 30.21 in
Dewpoint 15°F (-9°C)
Visibility 10.00 mi
Wind Chill20°F (-7°C)
Last update 2 Feb 3:35 am CST
Extended Forecast for

Marion IL

  • Overnight

    Overnight: Mostly cloudy, with a low around 18. South southwest wind around 6 mph.

    Low: 18 °F

    Mostly Cloudy

  • Monday

    Monday: Partly sunny, with a high near 39. Southwest wind 3 to 5 mph.

    High: 39 °F

    Partly Sunny

  • Monday Night

    Monday Night: Mostly cloudy, with a low around 25. South southeast wind around 5 mph becoming calm in the evening.

    Low: 25 °F

    Mostly Cloudy

  • Tuesday

    Tuesday: A chance of snow between 8am and 9am, then a chance of rain after 9am. Cloudy, with a high near 38. Calm wind becoming north 5 to 8 mph in the morning. Chance of precipitation is 40%.

    High: 38 °F

    Chance
    Rain/Snow
    then Chance
    Rain

  • Tuesday Night

    Tuesday Night: Mostly cloudy, with a low around 20. North wind 5 to 7 mph.

    Low: 20 °F

    Mostly Cloudy

  • Wednesday

    Wednesday: Partly sunny, with a high near 32. North wind 3 to 7 mph.

    High: 32 °F

    Partly Sunny

  • Wednesday Night

    Wednesday Night: Partly cloudy, with a low around 14. Calm wind.

    Low: 14 °F

    Partly Cloudy

  • Thursday

    Thursday: Mostly sunny, with a high near 37. Calm wind becoming southwest 5 to 7 mph in the afternoon.

    High: 37 °F

    Mostly Sunny

  • Thursday Night

    Thursday Night: Mostly clear, with a low around 28. Southwest wind 6 to 8 mph.

    Low: 28 °F

    Mostly Clear

Detailed Forecast

Overnight
Mostly cloudy, with a low around 18. South southwest wind around 6 mph.
Monday
Partly sunny, with a high near 39. Southwest wind 3 to 5 mph.
Monday Night
Mostly cloudy, with a low around 25. South southeast wind around 5 mph becoming calm in the evening.
Tuesday
A chance of snow between 8am and 9am, then a chance of rain after 9am. Cloudy, with a high near 38. Calm wind becoming north 5 to 8 mph in the morning. Chance of precipitation is 40%.
Tuesday Night
Mostly cloudy, with a low around 20. North wind 5 to 7 mph.
Wednesday
Partly sunny, with a high near 32. North wind 3 to 7 mph.
Wednesday Night
Partly cloudy, with a low around 14. Calm wind.
Thursday
Mostly sunny, with a high near 37. Calm wind becoming southwest 5 to 7 mph in the afternoon.
Thursday Night
Mostly clear, with a low around 28. Southwest wind 6 to 8 mph.
Friday
Mostly sunny, with a high near 47. West southwest wind 7 to 10 mph becoming north northwest in the afternoon.
Friday Night
Partly cloudy, with a low around 23. North northwest wind around 6 mph.
Saturday
Sunny, with a high near 38. North northeast wind around 6 mph.
Saturday Night
Partly cloudy, with a low around 23. Light and variable wind becoming southeast around 5 mph after midnight.
Sunday
Mostly sunny, with a high near 43. South wind 5 to 7 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 am CST Feb 2, 2026
Forecast Valid:
3am CST Feb 2, 2026-6pm CST Feb 8, 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