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.

Overcast

34°F

1°C

Humidity 81%
Wind Speed NE 6 mph
Barometer 29.94 in
Dewpoint 28°F (-2°C)
Visibility 10.00 mi
Wind Chill29°F (-2°C)
Last update 2 Jan 10:45 am CST
Extended Forecast for

Marion IL

  • Today

    Today: Cloudy, with a high near 38. Northeast wind around 6 mph.

    High: 38 °F

    Cloudy

  • Tonight

    Tonight: Mostly cloudy, with a low around 29. Northeast wind 3 to 5 mph.

    Low: 29 °F

    Mostly Cloudy

  • Saturday

    Saturday: Mostly cloudy, then gradually becoming sunny, with a high near 42. North northeast wind 5 to 7 mph.

    High: 42 °F

    Decreasing
    Clouds

  • Saturday Night

    Saturday Night: Mostly clear, with a low around 25. Light north northwest wind.

    Low: 25 °F

    Mostly Clear

  • Sunday

    Sunday: Mostly sunny, with a high near 42. Calm wind.

    High: 42 °F

    Mostly Sunny

  • Sunday Night

    Sunday Night: Partly cloudy, with a low around 31. Calm wind becoming south around 6 mph after midnight.

    Low: 31 °F

    Partly Cloudy

  • Monday

    Monday: Sunny, with a high near 55. South southwest wind 6 to 11 mph, with gusts as high as 18 mph.

    High: 55 °F

    Sunny

  • Monday Night

    Monday Night: Partly cloudy, with a low around 45. South southwest wind 6 to 8 mph.

    Low: 45 °F

    Partly Cloudy

  • Tuesday

    Tuesday: Partly sunny, with a high near 62. Southwest wind 7 to 11 mph, with gusts as high as 18 mph.

    High: 62 °F

    Partly Sunny

Detailed Forecast

Today
Cloudy, with a high near 38. Northeast wind around 6 mph.
Tonight
Mostly cloudy, with a low around 29. Northeast wind 3 to 5 mph.
Saturday
Mostly cloudy, then gradually becoming sunny, with a high near 42. North northeast wind 5 to 7 mph.
Saturday Night
Mostly clear, with a low around 25. Light north northwest wind.
Sunday
Mostly sunny, with a high near 42. Calm wind.
Sunday Night
Partly cloudy, with a low around 31. Calm wind becoming south around 6 mph after midnight.
Monday
Sunny, with a high near 55. South southwest wind 6 to 11 mph, with gusts as high as 18 mph.
Monday Night
Partly cloudy, with a low around 45. South southwest wind 6 to 8 mph.
Tuesday
Partly sunny, with a high near 62. Southwest wind 7 to 11 mph, with gusts as high as 18 mph.
Tuesday Night
Mostly cloudy, with a low around 43. South southwest wind around 6 mph becoming calm in the evening.
Wednesday
Partly sunny, with a high near 61. Calm wind becoming southwest around 5 mph.
Wednesday Night
A chance of showers. Mostly cloudy, with a low around 47. Calm wind becoming southeast around 5 mph after midnight.
Thursday
A chance of showers. Mostly cloudy, with a high near 62. South southeast wind 6 to 9 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:
10:27 am CST Jan 2, 2026
Forecast Valid:
11am CST Jan 2, 2026-6pm CST Jan 8, 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