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

42°F

6°C

Humidity 66%
Wind Speed N 10 G 18 mph
Barometer 30.16 in
Dewpoint 32°F (0°C)
Visibility 10.00 mi
Wind Chill36°F (2°C)
Last update 23 Mar 2:55 am CDT
Extended Forecast for

Marion IL

  • Overnight

    Overnight: Mostly clear, with a low around 37. North wind around 16 mph, with gusts as high as 29 mph.

    Low: 37 °F

    Mostly Clear

  • Monday

    Monday: Mostly sunny, with a high near 56. North northeast wind around 14 mph, with gusts as high as 25 mph.

    High: 56 °F

    Mostly Sunny

  • Monday Night

    Monday Night: Mostly cloudy, with a low around 38. East northeast wind 6 to 8 mph.

    Low: 38 °F

    Mostly Cloudy

  • Tuesday

    Tuesday: Partly sunny, with a high near 62. East southeast wind 5 to 8 mph.

    High: 62 °F

    Partly Sunny

  • Tuesday Night

    Tuesday Night: Partly cloudy, with a low around 42. East wind around 6 mph becoming calm in the evening.

    Low: 42 °F

    Partly Cloudy

  • Wednesday

    Wednesday: Mostly sunny, with a high near 73. Calm wind becoming south southwest 5 to 9 mph in the morning.

    High: 73 °F

    Mostly Sunny

  • Wednesday Night

    Wednesday Night: Partly cloudy, with a low around 59. South wind 6 to 9 mph, with gusts as high as 18 mph.

    Low: 59 °F

    Partly Cloudy

  • Thursday

    Thursday: Sunny, with a high near 85. South southwest wind 9 to 15 mph, with gusts as high as 23 mph.

    High: 85 °F

    Sunny

  • Thursday Night

    Thursday Night: A slight chance of showers, then a chance of showers and thunderstorms after 1am. Partly cloudy, with a low around 46. South southwest wind 11 to 14 mph becoming north northwest after midnight. Winds could gust as high as 23 mph.

    Low: 46 °F

    Chance
    Showers

Detailed Forecast

Overnight
Mostly clear, with a low around 37. North wind around 16 mph, with gusts as high as 29 mph.
Monday
Mostly sunny, with a high near 56. North northeast wind around 14 mph, with gusts as high as 25 mph.
Monday Night
Mostly cloudy, with a low around 38. East northeast wind 6 to 8 mph.
Tuesday
Partly sunny, with a high near 62. East southeast wind 5 to 8 mph.
Tuesday Night
Partly cloudy, with a low around 42. East wind around 6 mph becoming calm in the evening.
Wednesday
Mostly sunny, with a high near 73. Calm wind becoming south southwest 5 to 9 mph in the morning.
Wednesday Night
Partly cloudy, with a low around 59. South wind 6 to 9 mph, with gusts as high as 18 mph.
Thursday
Sunny, with a high near 85. South southwest wind 9 to 15 mph, with gusts as high as 23 mph.
Thursday Night
A slight chance of showers, then a chance of showers and thunderstorms after 1am. Partly cloudy, with a low around 46. South southwest wind 11 to 14 mph becoming north northwest after midnight. Winds could gust as high as 23 mph.
Friday
A chance of showers. Mostly cloudy, with a high near 55. North wind around 15 mph, with gusts as high as 24 mph.
Friday Night
A slight chance of showers. Partly cloudy, with a low around 33. North wind 7 to 13 mph, with gusts as high as 21 mph.
Saturday
Sunny, with a high near 58. North northeast wind 6 to 8 mph.
Saturday Night
Partly cloudy, with a low around 37. Light and variable wind.
Sunday
Mostly sunny, with a high near 65. South wind 3 to 8 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:
1:51 am CDT Mar 23, 2026
Forecast Valid:
3am CDT Mar 23, 2026-6pm CDT Mar 29, 2026
 
Forecast Discussion
 
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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