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

54°F

12°C

Humidity 86%
Wind Speed S 17 G 23 mph
Barometer 29.82 in
Dewpoint 50°F (10°C)
Visibility 10.00 mi
Wind Chill49°F (9°C)
Last update 17 Feb 8:55 pm CST
Extended Forecast for

Marion IL

  • Tonight

    Tonight: A slight chance of showers between 1am and 4am. Cloudy, with a temperature falling to near 55 by 10pm, then rising to around 59 during the remainder of the night. Breezy, with a south wind 16 to 20 mph, with gusts as high as 36 mph. Chance of precipitation is 20%.

    Low: 55 °F⇑

    Breezy.
    Cloudy then
    Slight Chance
    Showers

  • Wednesday

    Wednesday: Mostly cloudy, then gradually becoming sunny, with a high near 73. Southwest wind 8 to 15 mph, with gusts as high as 29 mph.

    High: 73 °F

    Decreasing
    Clouds

  • Wednesday Night

    Wednesday Night: A 40 percent chance of showers after midnight. Partly cloudy, with a low around 56. South wind around 6 mph.

    Low: 56 °F

    Partly Cloudy
    then Chance
    Showers

  • Thursday

    Thursday: Showers likely, mainly after noon. Partly sunny, with a high near 71. South wind 6 to 15 mph, with gusts as high as 26 mph. Chance of precipitation is 60%.

    High: 71 °F

    Showers
    Likely

  • Thursday Night

    Thursday Night: A 20 percent chance of showers before midnight. Mostly clear, with a low around 43. South southwest wind 9 to 11 mph becoming west after midnight. Winds could gust as high as 20 mph.

    Low: 43 °F

    Slight Chance
    Showers then
    Mostly Clear

  • Friday

    Friday: Sunny, with a high near 55. West wind 5 to 10 mph, with gusts as high as 18 mph.

    High: 55 °F

    Sunny

  • Friday Night

    Friday Night: A 20 percent chance of showers after midnight. Partly cloudy, with a low around 35. North wind 3 to 5 mph.

    Low: 35 °F

    Mostly Cloudy
    then Slight
    Chance
    Showers

  • Saturday

    Saturday: A chance of showers, mainly after noon. Mostly sunny, with a high near 48. North northeast wind 5 to 9 mph.

    High: 48 °F

    Chance
    Showers

  • Saturday Night

    Saturday Night: A chance of rain and snow showers before midnight, then a slight chance of snow showers. Partly cloudy, with a low around 29. North northwest wind 8 to 10 mph, with gusts as high as 20 mph.

    Low: 29 °F

    Chance
    Rain/Snow
    then Slight
    Chance Snow
    Showers

Detailed Forecast

Tonight
A slight chance of showers between 1am and 4am. Cloudy, with a temperature falling to near 55 by 10pm, then rising to around 59 during the remainder of the night. Breezy, with a south wind 16 to 20 mph, with gusts as high as 36 mph. Chance of precipitation is 20%.
Wednesday
Mostly cloudy, then gradually becoming sunny, with a high near 73. Southwest wind 8 to 15 mph, with gusts as high as 29 mph.
Wednesday Night
A 40 percent chance of showers after midnight. Partly cloudy, with a low around 56. South wind around 6 mph.
Thursday
Showers likely, mainly after noon. Partly sunny, with a high near 71. South wind 6 to 15 mph, with gusts as high as 26 mph. Chance of precipitation is 60%.
Thursday Night
A 20 percent chance of showers before midnight. Mostly clear, with a low around 43. South southwest wind 9 to 11 mph becoming west after midnight. Winds could gust as high as 20 mph.
Friday
Sunny, with a high near 55. West wind 5 to 10 mph, with gusts as high as 18 mph.
Friday Night
A 20 percent chance of showers after midnight. Partly cloudy, with a low around 35. North wind 3 to 5 mph.
Saturday
A chance of showers, mainly after noon. Mostly sunny, with a high near 48. North northeast wind 5 to 9 mph.
Saturday Night
A chance of rain and snow showers before midnight, then a slight chance of snow showers. Partly cloudy, with a low around 29. North northwest wind 8 to 10 mph, with gusts as high as 20 mph.
Sunday
A slight chance of rain and snow showers before noon. Mostly sunny, with a high near 41. Northwest wind 10 to 15 mph, with gusts as high as 23 mph.
Sunday Night
Mostly clear, with a low around 22. North northwest wind 6 to 10 mph.
Monday
Sunny, with a high near 40. North northwest wind 3 to 8 mph.
Monday Night
Mostly clear, with a low around 21. Calm wind.
Tuesday
Mostly sunny, with a high near 47. Light south southeast wind becoming south 5 to 10 mph in the morning. Winds could gust as high as 18 mph.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Marion IL
 37.73°N 88.95°W
Last Update:
5:46 pm CST Feb 17, 2026
Forecast Valid:
8pm CST Feb 17, 2026-6pm CST Feb 24, 2026
 
Forecast Discussion
 
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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