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

55°F

13°C

Humidity 63%
Wind Speed S 6 mph
Barometer 30.03 in
Dewpoint 42°F (6°C)
Visibility 10.00 mi
Wind Chill54°F (12°C)
Last update 20 Mar 1:55 am CDT
Extended Forecast for

Marion IL

  • Overnight

    Overnight: Mostly clear, with a steady temperature around 57. South southwest wind around 8 mph, with gusts as high as 18 mph.

    Low: 57 °F

    Mostly Clear

  • Friday

    Friday: Sunny, with a high near 82. Southwest wind around 10 mph, with gusts as high as 18 mph.

    High: 82 °F

    Sunny

  • Friday Night

    Friday Night: Partly cloudy, with a low around 53. South southwest wind around 6 mph becoming calm after midnight.

    Low: 53 °F

    Partly Cloudy

  • Saturday

    Saturday: Sunny, with a high near 81. Calm wind becoming east around 5 mph in the afternoon.

    High: 81 °F

    Sunny

  • Saturday Night

    Saturday Night: Clear, with a low around 60. Calm wind becoming south around 6 mph after midnight.

    Low: 60 °F

    Clear

  • Sunday

    Sunday: Sunny, with a high near 86. South southwest wind 8 to 15 mph, with gusts as high as 24 mph.

    High: 86 °F

    Sunny

  • Sunday Night

    Sunday Night: A 20 percent chance of showers and thunderstorms before 1am. Partly cloudy, with a low around 44. Southwest wind around 14 mph becoming north after midnight. Winds could gust as high as 23 mph.

    Low: 44 °F

    Slight Chance
    T-storms

  • Monday

    Monday: Sunny, with a high near 60. North wind around 11 mph, with gusts as high as 21 mph.

    High: 60 °F

    Sunny

  • Monday Night

    Monday Night: Partly cloudy, with a low around 40. East northeast wind 3 to 6 mph.

    Low: 40 °F

    Partly Cloudy

Detailed Forecast

Overnight
Mostly clear, with a steady temperature around 57. South southwest wind around 8 mph, with gusts as high as 18 mph.
Friday
Sunny, with a high near 82. Southwest wind around 10 mph, with gusts as high as 18 mph.
Friday Night
Partly cloudy, with a low around 53. South southwest wind around 6 mph becoming calm after midnight.
Saturday
Sunny, with a high near 81. Calm wind becoming east around 5 mph in the afternoon.
Saturday Night
Clear, with a low around 60. Calm wind becoming south around 6 mph after midnight.
Sunday
Sunny, with a high near 86. South southwest wind 8 to 15 mph, with gusts as high as 24 mph.
Sunday Night
A 20 percent chance of showers and thunderstorms before 1am. Partly cloudy, with a low around 44. Southwest wind around 14 mph becoming north after midnight. Winds could gust as high as 23 mph.
Monday
Sunny, with a high near 60. North wind around 11 mph, with gusts as high as 21 mph.
Monday Night
Partly cloudy, with a low around 40. East northeast wind 3 to 6 mph.
Tuesday
Partly sunny, with a high near 62. East southeast wind around 6 mph.
Tuesday Night
Mostly cloudy, with a low around 44. East wind 3 to 5 mph.
Wednesday
Partly sunny, with a high near 67. East wind 6 to 9 mph.
Wednesday Night
Partly cloudy, with a low around 51. South southeast wind around 8 mph.
Thursday
Sunny, with a high near 78. South southwest wind 9 to 15 mph, with gusts as high as 23 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:
1:26 am CDT Mar 20, 2026
Forecast Valid:
2am CDT Mar 20, 2026-6pm CDT Mar 26, 2026
 
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Additional Resources

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High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation