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

30°F

-1°C

Humidity 69%
Wind Speed S 9 mph
Barometer 30.03 in
Dewpoint 21°F (-6°C)
Visibility 10.00 mi
Wind Chill22°F (-6°C)
Last update 5 Feb 2:45 pm CST
Extended Forecast for

Marion IL

  • This Afternoon

    This Afternoon: Mostly cloudy, with a high near 31. South southwest wind around 9 mph.

    High: 31 °F

    Mostly Cloudy

  • Tonight

    Tonight: Mostly cloudy, then gradually becoming mostly clear, with a temperature rising to around 32 by 9pm. South southwest wind 3 to 7 mph.

    Low: 27 °F⇑

    Decreasing
    Clouds

  • Friday

    Friday: Increasing clouds, with a high near 47. West southwest wind 6 to 11 mph becoming north northwest 13 to 18 mph in the afternoon. Winds could gust as high as 32 mph.

    High: 47 °F

    Increasing
    Clouds

  • Friday Night

    Friday Night: Mostly cloudy, with a low around 24. North northwest wind 6 to 9 mph.

    Low: 24 °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: Partly cloudy, with a low around 23. Calm wind becoming south southeast around 5 mph after midnight.

    Low: 23 °F

    Partly Cloudy

  • Sunday

    Sunday: Mostly sunny, with a high near 49. South wind 5 to 8 mph.

    High: 49 °F

    Mostly Sunny

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 29. Light and variable wind.

    Low: 29 °F

    Mostly Clear

  • Monday

    Monday: Sunny, with a high near 56. Calm wind becoming south southwest around 5 mph.

    High: 56 °F

    Sunny

Detailed Forecast

This Afternoon
Mostly cloudy, with a high near 31. South southwest wind around 9 mph.
Tonight
Mostly cloudy, then gradually becoming mostly clear, with a temperature rising to around 32 by 9pm. South southwest wind 3 to 7 mph.
Friday
Increasing clouds, with a high near 47. West southwest wind 6 to 11 mph becoming north northwest 13 to 18 mph in the afternoon. Winds could gust as high as 32 mph.
Friday Night
Mostly cloudy, with a low around 24. 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
Partly cloudy, with a low around 23. Calm wind becoming south southeast around 5 mph after midnight.
Sunday
Mostly sunny, with a high near 49. South wind 5 to 8 mph.
Sunday Night
Mostly clear, with a low around 29. Light and variable wind.
Monday
Sunny, with a high near 56. Calm wind becoming south southwest around 5 mph.
Monday Night
Mostly clear, with a low around 40. Calm wind becoming south around 5 mph after midnight.
Tuesday
Partly sunny, with a high near 62. South southwest wind 5 to 9 mph.
Tuesday Night
A chance of showers. Mostly cloudy, with a low around 46. 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
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Marion IL
 37.73°N 88.95°W
Last Update:
3:22 pm CST Feb 5, 2026
Forecast Valid:
3pm CST Feb 5, 2026-6pm CST Feb 11, 2026
 
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Additional Resources

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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