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

28°F

-2°C

Humidity 80%
Wind Speed SW 7 mph
Barometer 29.93 in
Dewpoint 22°F (-6°C)
Visibility 10.00 mi
Wind Chill21°F (-6°C)
Last update 6 Feb 12:35 am CST
Extended Forecast for

Marion IL

  • Overnight

    Overnight: Mostly clear, with a low around 27. West southwest wind around 6 mph.

    Low: 27 °F

    Mostly Clear

  • Friday

    Friday: Increasing clouds, with a high near 47. West southwest wind 6 to 15 mph becoming north northwest in the afternoon. Winds could gust as high as 24 mph.

    High: 47 °F

    Increasing
    Clouds

  • Friday Night

    Friday Night: Mostly cloudy, with a low around 23. North northwest wind 6 to 9 mph.

    Low: 23 °F

    Mostly Cloudy

  • Saturday

    Saturday: Sunny, with a high near 35. North northeast wind around 6 mph becoming light and variable in the afternoon.

    High: 35 °F

    Sunny

  • Saturday Night

    Saturday Night: Mostly cloudy, with a low around 24. Calm wind becoming south southeast around 5 mph after midnight.

    Low: 24 °F

    Mostly Cloudy

  • Sunday

    Sunday: Mostly sunny, with a high near 50. South southwest wind 5 to 8 mph.

    High: 50 °F

    Mostly Sunny

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 32. Light south wind.

    Low: 32 °F

    Mostly Clear

  • Monday

    Monday: Sunny, with a high near 59. Light southwest wind.

    High: 59 °F

    Sunny

  • Monday Night

    Monday Night: Partly cloudy, with a low around 42. Calm wind becoming south southwest around 6 mph after midnight.

    Low: 42 °F

    Partly Cloudy

Detailed Forecast

Overnight
Mostly clear, with a low around 27. West southwest wind around 6 mph.
Friday
Increasing clouds, with a high near 47. West southwest wind 6 to 15 mph becoming north northwest in the afternoon. Winds could gust as high as 24 mph.
Friday Night
Mostly cloudy, with a low around 23. North northwest wind 6 to 9 mph.
Saturday
Sunny, with a high near 35. North northeast wind around 6 mph becoming light and variable in the afternoon.
Saturday Night
Mostly cloudy, with a low around 24. Calm wind becoming south southeast around 5 mph after midnight.
Sunday
Mostly sunny, with a high near 50. South southwest wind 5 to 8 mph.
Sunday Night
Mostly clear, with a low around 32. Light south wind.
Monday
Sunny, with a high near 59. Light southwest wind.
Monday Night
Partly cloudy, with a low around 42. Calm wind becoming south southwest around 6 mph after midnight.
Tuesday
A chance of showers, mainly after noon. Mostly cloudy, with a high near 65. South southwest wind 6 to 9 mph.
Tuesday Night
A chance of showers. Mostly cloudy, with a low around 42. Southwest wind around 7 mph becoming northwest after midnight.
Wednesday
A slight chance of showers. Mostly cloudy, with a high near 54. North northwest wind 6 to 9 mph.
Wednesday Night
A slight chance of showers. Mostly cloudy, with a low around 33. North wind around 5 mph.
Thursday
A slight chance of showers. Mostly cloudy, with a high near 47. North 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 88.92°W
Last Update:
12:46 am CST Feb 6, 2026
Forecast Valid:
12am CST Feb 6, 2026-6pm CST Feb 12, 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