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

28°F

-2°C

Humidity 69%
Wind Speed N 8 mph
Barometer 30.29 in
Dewpoint 19°F (-7°C)
Visibility 10.00 mi
Wind Chill20°F (-7°C)
Last update 4 Feb 3:35 am CST
Extended Forecast for

Marion IL

  • Overnight

    Overnight: Mostly cloudy, with a low around 23. North wind around 6 mph.

    Low: 23 °F

    Mostly Cloudy

  • Wednesday

    Wednesday: Partly sunny, with a high near 32. North wind 6 to 10 mph, with gusts as high as 18 mph.

    High: 32 °F

    Partly Sunny

  • Wednesday Night

    Wednesday Night: Partly cloudy, with a low around 14. North wind 5 to 7 mph becoming calm in the evening.

    Low: 14 °F

    Partly Cloudy

  • Thursday

    Thursday: Partly sunny, with a high near 35. Calm wind becoming southwest 5 to 7 mph in the afternoon.

    High: 35 °F

    Partly Sunny

  • Thursday Night

    Thursday Night: Partly cloudy, with a low around 29. West southwest wind around 7 mph.

    Low: 29 °F

    Partly Cloudy

  • Friday

    Friday: Mostly sunny, with a high near 50. West southwest wind 6 to 11 mph becoming north northwest in the afternoon. Winds could gust as high as 20 mph.

    High: 50 °F

    Mostly Sunny

  • Friday Night

    Friday Night: Partly cloudy, with a low around 26. North northwest wind 3 to 6 mph.

    Low: 26 °F

    Partly Cloudy

  • Saturday

    Saturday: Sunny, with a high near 42. Light and variable wind becoming east northeast around 6 mph in the morning.

    High: 42 °F

    Sunny

  • Saturday Night

    Saturday Night: Partly cloudy, with a low around 28. South wind 3 to 6 mph.

    Low: 28 °F

    Partly Cloudy

Detailed Forecast

Overnight
Mostly cloudy, with a low around 23. North wind around 6 mph.
Wednesday
Partly sunny, with a high near 32. North wind 6 to 10 mph, with gusts as high as 18 mph.
Wednesday Night
Partly cloudy, with a low around 14. North wind 5 to 7 mph becoming calm in the evening.
Thursday
Partly sunny, with a high near 35. Calm wind becoming southwest 5 to 7 mph in the afternoon.
Thursday Night
Partly cloudy, with a low around 29. West southwest wind around 7 mph.
Friday
Mostly sunny, with a high near 50. West southwest wind 6 to 11 mph becoming north northwest in the afternoon. Winds could gust as high as 20 mph.
Friday Night
Partly cloudy, with a low around 26. North northwest wind 3 to 6 mph.
Saturday
Sunny, with a high near 42. Light and variable wind becoming east northeast around 6 mph in the morning.
Saturday Night
Partly cloudy, with a low around 28. South wind 3 to 6 mph.
Sunday
Mostly sunny, with a high near 52. South wind 5 to 8 mph becoming north northwest in the afternoon.
Sunday Night
Partly cloudy, with a low around 29. Light north northeast wind.
Monday
Mostly sunny, with a high near 51. Calm wind becoming south around 5 mph.
Monday Night
Mostly cloudy, with a low around 37. South wind 3 to 5 mph.
Tuesday
A slight chance of showers. Partly sunny, with a high near 58. South southwest wind 5 to 8 mph.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Marion IL
 37.73°N 88.95°W
Last Update:
3:16 am CST Feb 4, 2026
Forecast Valid:
3am CST Feb 4, 2026-6pm CST Feb 10, 2026
 
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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