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.

Mostly Cloudy

28°F

-2°C

Humidity 47%
Wind Speed W 6 mph
Barometer 30.37 in
Dewpoint 10°F (-12°C)
Visibility 10.00 mi
Wind Chill21°F (-6°C)
Last update 28 Jan 11:45 am CST
Extended Forecast for

Marion IL

  • This Afternoon

    This Afternoon: Sunny, with a high near 28. West wind around 6 mph becoming calm.

    High: 28 °F

    Sunny

  • Tonight

    Tonight: Mostly cloudy, with a low around 12. Calm wind.

    Low: 12 °F

    Mostly Cloudy

  • Thursday

    Thursday: Mostly cloudy, with a high near 29. Calm wind becoming northeast around 6 mph in the morning.

    High: 29 °F

    Mostly Cloudy

  • Thursday Night

    Thursday Night: A 20 percent chance of snow showers. Mostly cloudy, with a low around 10. Northeast wind 3 to 6 mph.

    Low: 10 °F

    Slight Chance
    Snow Showers

  • Friday

    Friday: Partly sunny, with a high near 20. North wind 6 to 10 mph.

    High: 20 °F

    Partly Sunny

  • Friday Night

    Friday Night: Mostly cloudy, with a low around 3. North wind 7 to 9 mph.

    Low: 3 °F

    Mostly Cloudy

  • Saturday

    Saturday: Mostly sunny, with a high near 16. North northwest wind 8 to 13 mph, with gusts as high as 20 mph.

    High: 16 °F

    Mostly Sunny

  • Saturday Night

    Saturday Night: Partly cloudy, with a low around 3. Northwest wind 5 to 7 mph becoming calm in the evening.

    Low: 3 °F

    Partly Cloudy

  • Sunday

    Sunday: Partly sunny, with a high near 25. Calm wind becoming west around 6 mph in the morning.

    High: 25 °F

    Partly Sunny

Detailed Forecast

This Afternoon
Sunny, with a high near 28. West wind around 6 mph becoming calm.
Tonight
Mostly cloudy, with a low around 12. Calm wind.
Thursday
Mostly cloudy, with a high near 29. Calm wind becoming northeast around 6 mph in the morning.
Thursday Night
A 20 percent chance of snow showers. Mostly cloudy, with a low around 10. Northeast wind 3 to 6 mph.
Friday
Partly sunny, with a high near 20. North wind 6 to 10 mph.
Friday Night
Mostly cloudy, with a low around 3. North wind 7 to 9 mph.
Saturday
Mostly sunny, with a high near 16. North northwest wind 8 to 13 mph, with gusts as high as 20 mph.
Saturday Night
Partly cloudy, with a low around 3. Northwest wind 5 to 7 mph becoming calm in the evening.
Sunday
Partly sunny, with a high near 25. Calm wind becoming west around 6 mph in the morning.
Sunday Night
Partly cloudy, with a low around 13. South southwest wind 3 to 5 mph.
Monday
Partly sunny, with a high near 34. Southwest wind 3 to 7 mph.
Monday Night
Partly cloudy, with a low around 18. Light southwest wind.
Tuesday
Mostly cloudy, with a high near 36. Calm wind becoming southwest around 6 mph in the morning.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Marion IL
 37.73°N 88.92°W
Last Update:
10:56 am CST Jan 28, 2026
Forecast Valid:
12pm CST Jan 28, 2026-6pm CST Feb 3, 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