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

16°F

-9°C

Humidity 79%
Wind Speed Calm
Barometer 30.40 in
Dewpoint 10°F (-12°C)
Visibility 10.00 mi
Last update 28 Jan 7:45 am CST
Extended Forecast for

Marion IL

  • Today

    Today: Mostly sunny, with a high near 28. Calm wind becoming west 5 to 7 mph in the morning.

    High: 28 °F

    Mostly Sunny

  • Tonight

    Tonight: Mostly cloudy, with a low around 12. South wind around 5 mph becoming calm in the evening.

    Low: 12 °F

    Mostly Cloudy

  • Thursday

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

    High: 29 °F

    Mostly Cloudy

  • Thursday Night

    Thursday Night: Mostly cloudy, with a low around 10. North wind 3 to 5 mph.

    Low: 10 °F

    Mostly Cloudy

  • Friday

    Friday: Partly sunny, with a high near 20. North wind 5 to 10 mph.

    High: 20 °F

    Partly Sunny

  • Friday Night

    Friday Night: Partly cloudy, with a low around 3. North wind 6 to 8 mph.

    Low: 3 °F

    Partly Cloudy

  • Saturday

    Saturday: Mostly sunny, with a high near 16. Northwest wind 6 to 10 mph.

    High: 16 °F

    Mostly Sunny

  • Saturday Night

    Saturday Night: Partly cloudy, with a low around 2. Northwest wind around 5 mph becoming calm in the evening.

    Low: 2 °F

    Partly Cloudy

  • Sunday

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

    High: 25 °F

    Mostly Sunny

Detailed Forecast

Today
Mostly sunny, with a high near 28. Calm wind becoming west 5 to 7 mph in the morning.
Tonight
Mostly cloudy, with a low around 12. South wind around 5 mph becoming calm in the evening.
Thursday
Mostly cloudy, with a high near 29. Calm wind becoming northeast around 6 mph in the afternoon.
Thursday Night
Mostly cloudy, with a low around 10. North wind 3 to 5 mph.
Friday
Partly sunny, with a high near 20. North wind 5 to 10 mph.
Friday Night
Partly cloudy, with a low around 3. North wind 6 to 8 mph.
Saturday
Mostly sunny, with a high near 16. Northwest wind 6 to 10 mph.
Saturday Night
Partly cloudy, with a low around 2. Northwest wind around 5 mph becoming calm in the evening.
Sunday
Mostly sunny, with a high near 25. Calm wind becoming west southwest around 6 mph in the morning.
Sunday Night
A slight chance of snow showers before midnight. Mostly cloudy, with a low around 13. Light south southwest wind.
Monday
Partly sunny, with a high near 34. Southwest wind 3 to 7 mph.
Monday Night
Mostly cloudy, with a low around 18. Light southwest wind.
Tuesday
Mostly cloudy, with a high near 36. South wind 3 to 7 mph.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Marion IL
 37.73°N 88.95°W
Last Update:
8:11 am CST Jan 28, 2026
Forecast Valid:
8am 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