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

33°F

1°C

Humidity 79%
Wind Speed NW 3 mph
Barometer 30.26 in
Dewpoint 28°F (-2°C)
Visibility 10.00 mi
Last update 11 Feb 5:55 am CST
Extended Forecast for

Marion IL

  • Today

    Today: Mostly sunny, with a high near 49. North wind 5 to 9 mph.

    High: 49 °F

    Mostly Sunny

  • Tonight

    Tonight: Partly cloudy, with a low around 29. North wind around 5 mph becoming calm in the evening.

    Low: 29 °F

    Partly Cloudy

  • Thursday

    Thursday: Mostly cloudy, with a high near 50. Light east southeast wind.

    High: 50 °F

    Mostly Cloudy

  • Thursday Night

    Thursday Night: Mostly cloudy, with a low around 32. Calm wind.

    Low: 32 °F

    Mostly Cloudy

  • Friday

    Friday: Mostly sunny, with a high near 57. Calm wind becoming southeast around 5 mph.

    High: 57 °F

    Mostly Sunny

  • Friday Night

    Friday Night: Mostly cloudy, with a low around 37. Calm wind.

    Low: 37 °F

    Mostly Cloudy

  • Saturday

    Saturday: A 40 percent chance of showers, mainly after noon. Cloudy, with a high near 53. Calm wind becoming east southeast 5 to 7 mph in the morning.

    High: 53 °F

    Chance
    Showers

  • Saturday Night

    Saturday Night: Showers likely, mainly before midnight. Mostly cloudy, with a low around 43. East wind around 6 mph.

    Low: 43 °F

    Showers
    Likely

  • Sunday

    Sunday: A chance of showers before noon. Mostly sunny, with a high near 55. North wind 6 to 9 mph.

    High: 55 °F

    Chance
    Showers then
    Mostly Sunny

Detailed Forecast

Today
Mostly sunny, with a high near 49. North wind 5 to 9 mph.
Tonight
Partly cloudy, with a low around 29. North wind around 5 mph becoming calm in the evening.
Thursday
Mostly cloudy, with a high near 50. Light east southeast wind.
Thursday Night
Mostly cloudy, with a low around 32. Calm wind.
Friday
Mostly sunny, with a high near 57. Calm wind becoming southeast around 5 mph.
Friday Night
Mostly cloudy, with a low around 37. Calm wind.
Saturday
A 40 percent chance of showers, mainly after noon. Cloudy, with a high near 53. Calm wind becoming east southeast 5 to 7 mph in the morning.
Saturday Night
Showers likely, mainly before midnight. Mostly cloudy, with a low around 43. East wind around 6 mph.
Sunday
A chance of showers before noon. Mostly sunny, with a high near 55. North wind 6 to 9 mph.
Sunday Night
Partly cloudy, with a low around 39. North wind around 5 mph becoming calm in the evening.
Washington's Birthday
Mostly sunny, with a high near 60. Calm wind becoming south southeast 5 to 7 mph in the morning.
Monday Night
Mostly cloudy, with a low around 45. South wind around 6 mph.
Tuesday
Mostly cloudy, with a high near 64. South wind 7 to 14 mph, with gusts as high as 24 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:
5:06 am CST Feb 11, 2026
Forecast Valid:
6am CST Feb 11, 2026-6pm CST Feb 17, 2026
 
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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