Current conditions at

Marion - Williamson County Regional Airport (KMWA)

Lat: 37.77°NLon: 89.01°WElev: 486ft.

Fair

59°F

15°C

Humidity 34%
Wind Speed SW 8 mph
Barometer 29.79 in
Dewpoint 30°F (-1°C)
Visibility 10.00 mi
Last update 13 Jan 4:45 pm CST
Extended Forecast for

Marion IL

  • Tonight

    Tonight: Showers likely, mainly between 11pm and 2am.  Mostly cloudy, with a low around 42. Southwest wind 5 to 8 mph becoming west northwest after midnight.  Chance of precipitation is 60%.

    Low: 42 °F

    Showers
    Likely

  • Wednesday

    Wednesday: Partly sunny, with a temperature falling to around 32 by 5pm. Breezy, with a north northwest wind 8 to 13 mph increasing to 15 to 20 mph in the afternoon. Winds could gust as high as 29 mph.

    High: 43 °F

    Mostly Cloudy
    then Mostly
    Sunny and
    Breezy

  • Wednesday Night

    Wednesday Night: Mostly clear, with a low around 19. North northwest wind 6 to 15 mph, with gusts as high as 25 mph.

    Low: 19 °F

    Mostly Clear

  • Thursday

    Thursday: Sunny, with a high near 33. Northwest wind 5 to 7 mph becoming light and variable  in the afternoon.

    High: 33 °F

    Sunny

  • Thursday Night

    Thursday Night: A 20 percent chance of snow showers after midnight.  Mostly cloudy, with a low around 25. Light south southwest wind increasing to 8 to 13 mph in the evening. Winds could gust as high as 23 mph.

    Low: 25 °F

    Partly Cloudy
    then Slight
    Chance Snow
    Showers

  • Friday

    Friday: Partly sunny, with a high near 47. West wind 11 to 14 mph, with gusts as high as 24 mph.

    High: 47 °F

    Partly Sunny

  • Friday Night

    Friday Night: Mostly cloudy, with a low around 22. West wind 8 to 10 mph, with gusts as high as 18 mph.

    Low: 22 °F

    Mostly Cloudy

  • Saturday

    Saturday: Partly sunny, with a high near 30. West northwest wind 9 to 14 mph, with gusts as high as 22 mph.

    High: 30 °F

    Partly Sunny

  • Saturday Night

    Saturday Night: Partly cloudy, with a low around 13. West northwest wind 6 to 8 mph.

    Low: 13 °F

    Partly Cloudy

Detailed Forecast

Tonight
Showers likely, mainly between 11pm and 2am. Mostly cloudy, with a low around 42. Southwest wind 5 to 8 mph becoming west northwest after midnight. Chance of precipitation is 60%.
Wednesday
Partly sunny, with a temperature falling to around 32 by 5pm. Breezy, with a north northwest wind 8 to 13 mph increasing to 15 to 20 mph in the afternoon. Winds could gust as high as 29 mph.
Wednesday Night
Mostly clear, with a low around 19. North northwest wind 6 to 15 mph, with gusts as high as 25 mph.
Thursday
Sunny, with a high near 33. Northwest wind 5 to 7 mph becoming light and variable in the afternoon.
Thursday Night
A 20 percent chance of snow showers after midnight. Mostly cloudy, with a low around 25. Light south southwest wind increasing to 8 to 13 mph in the evening. Winds could gust as high as 23 mph.
Friday
Partly sunny, with a high near 47. West wind 11 to 14 mph, with gusts as high as 24 mph.
Friday Night
Mostly cloudy, with a low around 22. West wind 8 to 10 mph, with gusts as high as 18 mph.
Saturday
Partly sunny, with a high near 30. West northwest wind 9 to 14 mph, with gusts as high as 22 mph.
Saturday Night
Partly cloudy, with a low around 13. West northwest wind 6 to 8 mph.
Sunday
Sunny, with a high near 31. West southwest wind 7 to 11 mph, with gusts as high as 20 mph.
Sunday Night
Mostly clear, with a low around 18. Southwest wind around 8 mph.
M.L.King Day
Sunny, with a high near 36. West wind 7 to 11 mph, with gusts as high as 20 mph.
Monday Night
Mostly clear, with a low around 13. Northwest wind around 6 mph.
Tuesday
Sunny, with a high near 33. Northwest wind 5 to 8 mph becoming south in the afternoon.
Basemap Options
Click map to change the forecast location
Loading map...

ABOUT THIS FORECAST

 
Point Forecast:
Marion IL
 37.73°N 88.92°W
3:17 pm CST Jan 13, 2026
5pm CST Jan 13, 2026-6pm CST Jan 20, 2026
 
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