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

25°F

-4°C

Humidity 77%
Wind Speed NE 3 mph
Barometer 30.16 in
Dewpoint 19°F (-7°C)
Visibility 10.00 mi
Last update 9 Feb 1:35 am CST
Extended Forecast for

Marion IL

  • Overnight

    Overnight: Clear, with a low around 27. Calm wind.

    Low: 27 °F

    Clear

  • Monday

    Monday: Sunny, with a high near 54. Calm wind.

    High: 54 °F

    Sunny

  • Monday Night

    Monday Night: Partly cloudy, with a low around 39. Calm wind becoming south southwest 5 to 7 mph in the evening.

    Low: 39 °F

    Partly Cloudy

  • Tuesday

    Tuesday: Mostly sunny, with a high near 63. Southwest wind 6 to 8 mph becoming north northwest in the afternoon.

    High: 63 °F

    Mostly Sunny

  • Tuesday Night

    Tuesday Night: A 30 percent chance of showers. Mostly cloudy, with a low around 33. North wind around 6 mph.

    Low: 33 °F

    Chance
    Showers

  • Wednesday

    Wednesday: Mostly sunny, with a high near 50. North wind 3 to 6 mph.

    High: 50 °F

    Mostly Sunny

  • Wednesday Night

    Wednesday Night: Mostly cloudy, with a low around 31. Calm wind.

    Low: 31 °F

    Mostly Cloudy

  • Thursday

    Thursday: Mostly cloudy, with a high near 48. Calm wind becoming east around 6 mph in the morning.

    High: 48 °F

    Mostly Cloudy

  • Thursday Night

    Thursday Night: A chance of showers. Cloudy, with a low around 34. East wind around 5 mph.

    Low: 34 °F

    Chance
    Showers

Detailed Forecast

Overnight
Clear, with a low around 27. Calm wind.
Monday
Sunny, with a high near 54. Calm wind.
Monday Night
Partly cloudy, with a low around 39. Calm wind becoming south southwest 5 to 7 mph in the evening.
Tuesday
Mostly sunny, with a high near 63. Southwest wind 6 to 8 mph becoming north northwest in the afternoon.
Tuesday Night
A 30 percent chance of showers. Mostly cloudy, with a low around 33. North wind around 6 mph.
Wednesday
Mostly sunny, with a high near 50. North wind 3 to 6 mph.
Wednesday Night
Mostly cloudy, with a low around 31. Calm wind.
Thursday
Mostly cloudy, with a high near 48. Calm wind becoming east around 6 mph in the morning.
Thursday Night
A chance of showers. Cloudy, with a low around 34. East wind around 5 mph.
Friday
A slight chance of showers. Mostly cloudy, with a high near 47. East northeast wind 5 to 7 mph.
Friday Night
A chance of showers and thunderstorms. Mostly cloudy, with a low around 34. East northeast wind around 6 mph.
Saturday
Showers likely. Cloudy, with a high near 48. East northeast wind 6 to 10 mph.
Saturday Night
Showers likely. Mostly cloudy, with a low around 36. North wind around 9 mph, with gusts as high as 18 mph.
Sunday
A chance of showers. Mostly sunny, with a high near 51. Northwest wind 7 to 11 mph, with gusts as high as 18 mph.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Marion IL
 37.73°N 88.92°W
Last Update:
1:17 am CST Feb 9, 2026
Forecast Valid:
1am CST Feb 9, 2026-6pm CST Feb 15, 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