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

45°F

7°C

Humidity 57%
Wind Speed N 7 mph
Barometer 30.12 in
Dewpoint 30°F (-1°C)
Visibility 10.00 mi
Wind Chill41°F (5°C)
Last update 10 Feb 11:55 pm CST
Extended Forecast for

Marion IL

  • Overnight

    Overnight: Mostly cloudy, with a low around 31. North wind around 8 mph.

    Low: 31 °F

    Mostly Cloudy

  • Wednesday

    Wednesday: Partly sunny, then gradually becoming sunny, with a high near 49. North wind 5 to 8 mph.

    High: 49 °F

    Becoming
    Sunny

  • Wednesday Night

    Wednesday Night: Increasing clouds, with a low around 30. Light and variable wind.

    Low: 30 °F

    Increasing
    Clouds

  • Thursday

    Thursday: Cloudy, with a high near 48. Calm wind becoming east southeast around 5 mph.

    High: 48 °F

    Cloudy

  • Thursday Night

    Thursday Night: A 20 percent chance of showers before midnight. Mostly cloudy, with a low around 33. Light east wind.

    Low: 33 °F

    Slight Chance
    Showers then
    Mostly Cloudy

  • Friday

    Friday: Partly sunny, with a high near 54. Calm wind becoming southeast around 6 mph.

    High: 54 °F

    Partly Sunny

  • Friday Night

    Friday Night: Mostly cloudy, with a low around 39. Light east southeast wind.

    Low: 39 °F

    Mostly Cloudy

  • Saturday

    Saturday: A chance of showers. Cloudy, with a high near 52. East southeast wind 3 to 8 mph.

    High: 52 °F

    Chance
    Showers

  • Saturday Night

    Saturday Night: Showers likely. Cloudy, with a low around 45. East wind 6 to 8 mph.

    Low: 45 °F

    Showers
    Likely

Detailed Forecast

Overnight
Mostly cloudy, with a low around 31. North wind around 8 mph.
Wednesday
Partly sunny, then gradually becoming sunny, with a high near 49. North wind 5 to 8 mph.
Wednesday Night
Increasing clouds, with a low around 30. Light and variable wind.
Thursday
Cloudy, with a high near 48. Calm wind becoming east southeast around 5 mph.
Thursday Night
A 20 percent chance of showers before midnight. Mostly cloudy, with a low around 33. Light east wind.
Friday
Partly sunny, with a high near 54. Calm wind becoming southeast around 6 mph.
Friday Night
Mostly cloudy, with a low around 39. Light east southeast wind.
Saturday
A chance of showers. Cloudy, with a high near 52. East southeast wind 3 to 8 mph.
Saturday Night
Showers likely. Cloudy, with a low around 45. East wind 6 to 8 mph.
Sunday
A chance of showers, mainly before noon. Partly sunny, with a high near 56. North wind 7 to 10 mph.
Sunday Night
Mostly clear, with a low around 37. North wind around 6 mph becoming calm in the evening.
Washington's Birthday
Sunny, with a high near 60. Calm wind becoming south southeast around 6 mph in the morning.
Monday Night
Mostly cloudy, with a low around 42. South southeast wind 3 to 6 mph.
Tuesday
Mostly cloudy, with a high near 65. South wind 6 to 13 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:
10:07 pm CST Feb 10, 2026
Forecast Valid:
12am CST Feb 11, 2026-6pm CST Feb 17, 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