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

39°F

4°C

Humidity 81%
Wind Speed S 12 mph
Barometer 29.98 in
Dewpoint 34°F (1°C)
Visibility 10.00 mi
Wind Chill32°F (0°C)
Last update 6 Dec 6:45 pm CST
Extended Forecast for

Marion IL

  • Tonight

    Tonight: A slight chance of drizzle after 4am. Patchy fog between 10pm and midnight. Otherwise, mostly cloudy, with a low around 34. South southeast wind around 5 mph becoming calm in the evening.

    Low: 34 °F

    Patchy Fog
    then Slight
    Chance
    Drizzle

  • Sunday

    Sunday: A slight chance of drizzle. Cloudy, with a high near 46. Light and variable wind becoming north northwest 5 to 10 mph in the morning.

    High: 46 °F

    Slight Chance
    Drizzle

  • Sunday Night

    Sunday Night: A slight chance of rain showers, mixing with snow after 9pm, then gradually ending. Cloudy, with a low around 25. North wind 6 to 10 mph. Chance of precipitation is 20%.

    Low: 25 °F

    Slight Chance
    Rain/Snow
    then Mostly
    Cloudy

  • Monday

    Monday: Mostly cloudy, then gradually becoming sunny, with a high near 37. North wind around 6 mph becoming calm in the afternoon.

    High: 37 °F

    Decreasing
    Clouds

  • Monday Night

    Monday Night: Partly cloudy, with a low around 25. Calm wind becoming south southwest 5 to 9 mph after midnight.

    Low: 25 °F

    Partly Cloudy

  • Tuesday

    Tuesday: Mostly sunny, with a high near 49. South southwest wind 10 to 14 mph, with gusts as high as 23 mph.

    High: 49 °F

    Mostly Sunny

  • Tuesday Night

    Tuesday Night: Mostly cloudy, with a low around 42. South southwest wind 14 to 16 mph, with gusts as high as 25 mph.

    Low: 42 °F

    Mostly Cloudy

  • Wednesday

    Wednesday: Partly sunny, with a high near 52. Southwest wind 8 to 14 mph becoming northwest in the afternoon. Winds could gust as high as 24 mph.

    High: 52 °F

    Partly Sunny

  • Wednesday Night

    Wednesday Night: A slight chance of rain showers before midnight, then a slight chance of rain and snow showers. Mostly cloudy, with a low around 29. Northwest wind around 6 mph becoming light and variable.

    Low: 29 °F

    Slight Chance
    Showers then
    Slight Chance
    Rain/Snow

Detailed Forecast

Tonight
A slight chance of drizzle after 4am. Patchy fog between 10pm and midnight. Otherwise, mostly cloudy, with a low around 34. South southeast wind around 5 mph becoming calm in the evening.
Sunday
A slight chance of drizzle. Cloudy, with a high near 46. Light and variable wind becoming north northwest 5 to 10 mph in the morning.
Sunday Night
A slight chance of rain showers, mixing with snow after 9pm, then gradually ending. Cloudy, with a low around 25. North wind 6 to 10 mph. Chance of precipitation is 20%.
Monday
Mostly cloudy, then gradually becoming sunny, with a high near 37. North wind around 6 mph becoming calm in the afternoon.
Monday Night
Partly cloudy, with a low around 25. Calm wind becoming south southwest 5 to 9 mph after midnight.
Tuesday
Mostly sunny, with a high near 49. South southwest wind 10 to 14 mph, with gusts as high as 23 mph.
Tuesday Night
Mostly cloudy, with a low around 42. South southwest wind 14 to 16 mph, with gusts as high as 25 mph.
Wednesday
Partly sunny, with a high near 52. Southwest wind 8 to 14 mph becoming northwest in the afternoon. Winds could gust as high as 24 mph.
Wednesday Night
A slight chance of rain showers before midnight, then a slight chance of rain and snow showers. Mostly cloudy, with a low around 29. Northwest wind around 6 mph becoming light and variable.
Thursday
A chance of rain and snow showers before noon, then a slight chance of rain showers. Mostly cloudy, with a high near 41. East wind 6 to 10 mph becoming west in the afternoon.
Thursday Night
Mostly cloudy, with a low around 23. West northwest wind around 7 mph.
Friday
Partly sunny, with a high near 31. Northwest wind 7 to 11 mph.
Friday Night
Partly cloudy, with a low around 12. Northwest wind 6 to 8 mph.
Saturday
Mostly sunny, with a high near 29. Northwest 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:
5:11 pm CST Dec 6, 2025
Forecast Valid:
7pm CST Dec 6, 2025-6pm CST Dec 13, 2025
 
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Additional Resources

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Hourly Weather Forecast

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High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation