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

11°F

-12°C

Humidity 89%
Wind Speed Calm
Barometer 30.30 in
Dewpoint 9°F (-13°C)
Visibility 7.00 mi
Last update 5 Feb 5:55 am CST
Extended Forecast for

Marion IL

  • Today

    Today: Mostly cloudy, with a high near 35. Calm wind becoming south southwest 5 to 8 mph in the afternoon.

    High: 35 °F

    Mostly Cloudy

  • Tonight

    Tonight: Mostly cloudy, with a low around 29. South wind around 6 mph becoming light and variable.

    Low: 29 °F

    Mostly Cloudy

  • Friday

    Friday: Mostly sunny, with a high near 49. West southwest wind 5 to 13 mph becoming north northwest in the afternoon. Winds could gust as high as 21 mph.

    High: 49 °F

    Mostly Sunny

  • Friday Night

    Friday Night: Partly cloudy, with a low around 25. North northwest wind 6 to 9 mph.

    Low: 25 °F

    Partly Cloudy

  • Saturday

    Saturday: Sunny, with a high near 36. North northeast wind around 6 mph becoming calm in the afternoon.

    High: 36 °F

    Sunny

  • Saturday Night

    Saturday Night: Partly cloudy, with a low around 25. Calm wind becoming south southeast around 5 mph after midnight.

    Low: 25 °F

    Partly Cloudy

  • Sunday

    Sunday: Mostly sunny, with a high near 53. South southwest wind 3 to 8 mph.

    High: 53 °F

    Mostly Sunny

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 33. Calm wind.

    Low: 33 °F

    Mostly Clear

  • Monday

    Monday: Sunny, with a high near 59. Calm wind becoming south southwest around 5 mph.

    High: 59 °F

    Sunny

Detailed Forecast

Today
Mostly cloudy, with a high near 35. Calm wind becoming south southwest 5 to 8 mph in the afternoon.
Tonight
Mostly cloudy, with a low around 29. South wind around 6 mph becoming light and variable.
Friday
Mostly sunny, with a high near 49. West southwest wind 5 to 13 mph becoming north northwest in the afternoon. Winds could gust as high as 21 mph.
Friday Night
Partly cloudy, with a low around 25. North northwest wind 6 to 9 mph.
Saturday
Sunny, with a high near 36. North northeast wind around 6 mph becoming calm in the afternoon.
Saturday Night
Partly cloudy, with a low around 25. Calm wind becoming south southeast around 5 mph after midnight.
Sunday
Mostly sunny, with a high near 53. South southwest wind 3 to 8 mph.
Sunday Night
Mostly clear, with a low around 33. Calm wind.
Monday
Sunny, with a high near 59. Calm wind becoming south southwest around 5 mph.
Monday Night
Partly cloudy, with a low around 43. South southwest wind 3 to 5 mph.
Tuesday
A slight chance of showers. Mostly cloudy, with a high near 63. South southwest wind 5 to 9 mph.
Tuesday Night
A chance of showers. Mostly cloudy, with a low around 44. South southwest wind around 6 mph.
Wednesday
A chance of showers. Mostly cloudy, with a high near 58. West southwest wind 6 to 9 mph.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Marion IL
 37.73°N 88.92°W
Last Update:
5:12 am CST Feb 5, 2026
Forecast Valid:
6am CST Feb 5, 2026-6pm CST Feb 11, 2026
 
Forecast Discussion
 
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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