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

57°F

14°C

Humidity 67%
Wind Speed S 9 mph
Barometer 29.99 in
Dewpoint 46°F (8°C)
Visibility 10.00 mi
Last update 20 Mar 3:55 am CDT
Extended Forecast for

Marion IL

  • Today

    Today: Sunny, with a high near 81. Southwest wind 8 to 10 mph, with gusts as high as 18 mph.

    High: 81 °F

    Sunny

  • Tonight

    Tonight: Partly cloudy, with a low around 53. 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 slight chance of showers and thunderstorms before 10pm, then a slight chance of showers between 10pm and 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. Chance of precipitation is 20%.

    Low: 44 °F

    Slight Chance
    T-storms then
    Slight Chance
    Showers

  • 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 41. East northeast wind 3 to 6 mph.

    Low: 41 °F

    Partly Cloudy

  • Tuesday

    Tuesday: Partly sunny, with a high near 62. East southeast wind around 6 mph.

    High: 62 °F

    Partly Sunny

Detailed Forecast

Today
Sunny, with a high near 81. Southwest wind 8 to 10 mph, with gusts as high as 18 mph.
Tonight
Partly cloudy, with a low around 53. 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 slight chance of showers and thunderstorms before 10pm, then a slight chance of showers between 10pm and 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. Chance of precipitation is 20%.
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 41. 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 14 mph, with gusts as high as 23 mph.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Marion IL
 37.73°N 88.95°W
Last Update:
1:26 am CDT Mar 20, 2026
Forecast Valid:
4am CDT Mar 20, 2026-6pm CDT Mar 26, 2026
 
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Additional Resources

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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