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

47°F

8°C

Humidity 57%
Wind Speed N 3 mph
Barometer 29.80 in
Dewpoint 32°F (0°C)
Visibility 10.00 mi
Last update 26 Feb 1:15 am CST
Extended Forecast for

Marion IL

  • Overnight

    Overnight: A 50 percent chance of showers, mainly before 5am. Mostly cloudy, with a low around 39. Northeast wind around 6 mph.

    Low: 39 °F

    Chance
    Showers

  • Thursday

    Thursday: Mostly cloudy, then gradually becoming sunny, with a high near 58. East northeast wind around 6 mph becoming calm in the afternoon.

    High: 58 °F

    Decreasing
    Clouds

  • Thursday Night

    Thursday Night: Mostly clear, with a low around 36. Calm wind.

    Low: 36 °F

    Mostly Clear

  • Friday

    Friday: Sunny, with a high near 66. Light south southwest wind becoming southwest 6 to 11 mph in the morning. Winds could gust as high as 20 mph.

    High: 66 °F

    Sunny

  • Friday Night

    Friday Night: Mostly clear, with a low around 43. South southwest wind 5 to 7 mph becoming light and variable after midnight.

    Low: 43 °F

    Mostly Clear

  • Saturday

    Saturday: Sunny, with a high near 68. Light and variable wind becoming south 5 to 9 mph in the morning.

    High: 68 °F

    Sunny

  • Saturday Night

    Saturday Night: A 20 percent chance of showers. Mostly clear, with a low around 36. South southwest wind 7 to 10 mph becoming north northeast after midnight. Winds could gust as high as 18 mph.

    Low: 36 °F

    Slight Chance
    Showers

  • Sunday

    Sunday: A chance of showers, mainly after noon. Mostly cloudy, with a high near 46. East northeast wind around 11 mph, with gusts as high as 20 mph.

    High: 46 °F

    Chance
    Showers

  • Sunday Night

    Sunday Night: Rain and snow showers likely before midnight, then rain showers, snow showers, and freezing rain likely. Cloudy, with a low around 32. Northeast wind around 10 mph, with gusts as high as 18 mph.

    Low: 32 °F

    Wintry Mix
    Likely

Detailed Forecast

Overnight
A 50 percent chance of showers, mainly before 5am. Mostly cloudy, with a low around 39. Northeast wind around 6 mph.
Thursday
Mostly cloudy, then gradually becoming sunny, with a high near 58. East northeast wind around 6 mph becoming calm in the afternoon.
Thursday Night
Mostly clear, with a low around 36. Calm wind.
Friday
Sunny, with a high near 66. Light south southwest wind becoming southwest 6 to 11 mph in the morning. Winds could gust as high as 20 mph.
Friday Night
Mostly clear, with a low around 43. South southwest wind 5 to 7 mph becoming light and variable after midnight.
Saturday
Sunny, with a high near 68. Light and variable wind becoming south 5 to 9 mph in the morning.
Saturday Night
A 20 percent chance of showers. Mostly clear, with a low around 36. South southwest wind 7 to 10 mph becoming north northeast after midnight. Winds could gust as high as 18 mph.
Sunday
A chance of showers, mainly after noon. Mostly cloudy, with a high near 46. East northeast wind around 11 mph, with gusts as high as 20 mph.
Sunday Night
Rain and snow showers likely before midnight, then rain showers, snow showers, and freezing rain likely. Cloudy, with a low around 32. Northeast wind around 10 mph, with gusts as high as 18 mph.
Monday
A chance of rain and snow showers before noon, then a slight chance of rain showers. Cloudy, with a high near 44. Northeast wind 8 to 10 mph, with gusts as high as 18 mph.
Monday Night
A chance of showers. Mostly cloudy, with a low around 31. East northeast wind around 7 mph.
Tuesday
A chance of showers. Cloudy, with a high near 50. East northeast wind 6 to 8 mph becoming southwest in the morning.
Tuesday Night
A chance of showers. Cloudy, with a low around 35. North northeast wind around 6 mph.
Wednesday
A chance of showers. Mostly cloudy, with a high near 56. Northeast wind 6 to 8 mph becoming east southeast in the afternoon.
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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:
12:46 am CST Feb 26, 2026
Forecast Valid:
1am CST Feb 26, 2026-6pm CST Mar 4, 2026
 
Forecast Discussion
 
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Additional Resources

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High Temperature

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Chance of Precipitation