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.

Partly Cloudy

70°F

21°C

Humidity 64%
Wind Speed NA
Barometer 29.89 in
Dewpoint 57°F (14°C)
Visibility 10.00 mi
Last update 21 Mar 10:45 am CDT
Extended Forecast for

Marion IL

  • Today

    Today: Sunny, with a high near 86. Southwest wind 3 to 5 mph.

    High: 86 °F

    Sunny

  • Tonight

    Tonight: Mostly clear, with a low around 64. South southwest wind 3 to 8 mph.

    Low: 64 °F

    Mostly Clear

  • Sunday

    Sunday: Mostly sunny, with a high near 84. South southwest wind 9 to 16 mph, with gusts as high as 26 mph.

    High: 84 °F

    Mostly Sunny

  • Sunday Night

    Sunday Night: A chance of showers and thunderstorms before 10pm, then a chance of showers between 10pm and 1am. Partly cloudy, with a low around 40. North wind 11 to 16 mph, with gusts as high as 29 mph. Chance of precipitation is 30%.

    Low: 40 °F

    Chance
    Showers

  • Monday

    Monday: Mostly sunny, with a high near 59. North northeast wind around 10 mph, with gusts as high as 20 mph.

    High: 59 °F

    Mostly Sunny

  • Monday Night

    Monday Night: Mostly cloudy, with a low around 41. Northeast wind around 6 mph.

    Low: 41 °F

    Mostly Cloudy

  • Tuesday

    Tuesday: Partly sunny, with a high near 65. Southeast wind around 6 mph.

    High: 65 °F

    Partly Sunny

  • Tuesday Night

    Tuesday Night: Mostly cloudy, with a low around 46. Calm wind.

    Low: 46 °F

    Mostly Cloudy

  • Wednesday

    Wednesday: Partly sunny, with a high near 73. South wind 3 to 8 mph.

    High: 73 °F

    Partly Sunny

Detailed Forecast

Today
Sunny, with a high near 86. Southwest wind 3 to 5 mph.
Tonight
Mostly clear, with a low around 64. South southwest wind 3 to 8 mph.
Sunday
Mostly sunny, with a high near 84. South southwest wind 9 to 16 mph, with gusts as high as 26 mph.
Sunday Night
A chance of showers and thunderstorms before 10pm, then a chance of showers between 10pm and 1am. Partly cloudy, with a low around 40. North wind 11 to 16 mph, with gusts as high as 29 mph. Chance of precipitation is 30%.
Monday
Mostly sunny, with a high near 59. North northeast wind around 10 mph, with gusts as high as 20 mph.
Monday Night
Mostly cloudy, with a low around 41. Northeast wind around 6 mph.
Tuesday
Partly sunny, with a high near 65. Southeast wind around 6 mph.
Tuesday Night
Mostly cloudy, with a low around 46. Calm wind.
Wednesday
Partly sunny, with a high near 73. South wind 3 to 8 mph.
Wednesday Night
A slight chance of showers and thunderstorms. Partly cloudy, with a low around 58. South wind 6 to 8 mph.
Thursday
A slight chance of showers and thunderstorms. Sunny, with a high near 84. Southwest wind 8 to 15 mph, with gusts as high as 23 mph.
Thursday Night
A chance of showers and thunderstorms. Partly cloudy, with a low around 49. South southwest wind around 11 mph becoming north after midnight. Winds could gust as high as 21 mph.
Friday
A chance of showers. Partly sunny, with a high near 60. North northeast wind 10 to 13 mph, with gusts as high as 21 mph.
Basemap Options
Click map to change the forecast location
Loading map...
Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Marion IL
 37.73°N 88.95°W
Last Update:
11:06 am CDT Mar 21, 2026
Forecast Valid:
11am CDT Mar 21, 2026-6pm CDT Mar 27, 2026
 
Forecast Discussion
 
Get as KML Get as XML

Additional Resources

Radar & Satellite Image

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