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.

N/A

Humidity NA
Wind Speed NA
Barometer NA
Dewpoint N/A
Visibility NA
Last update *** Not a current observation ***
Extended Forecast for

Marion IL

  • Overnight

    Overnight: A slight chance of freezing rain before 3am. Mostly cloudy, with a steady temperature around 29. Calm wind becoming north 5 to 9 mph. Chance of precipitation is 20%.

    Low: 29 °F

    Slight Chance
    Freezing Rain

  • Thursday

    Thursday: Partly sunny, with a high near 31. North wind 5 to 10 mph.

    High: 31 °F

    Partly Sunny

  • Thursday Night

    Thursday Night: Partly cloudy, with a low around 19. Calm wind.

    Low: 19 °F

    Partly Cloudy

  • Friday

    Friday: Sunny, with a high near 41. Calm wind becoming south southwest around 6 mph in the afternoon.

    High: 41 °F

    Sunny

  • Friday Night

    Friday Night: Partly cloudy, with a low around 27. South wind around 5 mph becoming calm in the evening.

    Low: 27 °F

    Partly Cloudy

  • Saturday

    Saturday: Mostly sunny, with a high near 45. Calm wind becoming west around 5 mph.

    High: 45 °F

    Mostly Sunny

  • Saturday Night

    Saturday Night: A 20 percent chance of showers after midnight. Mostly cloudy, with a low around 30. Calm wind becoming northeast around 5 mph after midnight.

    Low: 30 °F

    Mostly Cloudy
    then Slight
    Chance
    Showers

  • Sunday

    Sunday: A slight chance of showers before noon. Mostly cloudy, with a high near 40. North wind 5 to 9 mph.

    High: 40 °F

    Slight Chance
    Showers then
    Mostly Cloudy

  • Sunday Night

    Sunday Night: Mostly cloudy, with a low around 22. North wind 5 to 8 mph.

    Low: 22 °F

    Mostly Cloudy

Detailed Forecast

Overnight
A slight chance of freezing rain before 3am. Mostly cloudy, with a steady temperature around 29. Calm wind becoming north 5 to 9 mph. Chance of precipitation is 20%.
Thursday
Partly sunny, with a high near 31. North wind 5 to 10 mph.
Thursday Night
Partly cloudy, with a low around 19. Calm wind.
Friday
Sunny, with a high near 41. Calm wind becoming south southwest around 6 mph in the afternoon.
Friday Night
Partly cloudy, with a low around 27. South wind around 5 mph becoming calm in the evening.
Saturday
Mostly sunny, with a high near 45. Calm wind becoming west around 5 mph.
Saturday Night
A 20 percent chance of showers after midnight. Mostly cloudy, with a low around 30. Calm wind becoming northeast around 5 mph after midnight.
Sunday
A slight chance of showers before noon. Mostly cloudy, with a high near 40. North wind 5 to 9 mph.
Sunday Night
Mostly cloudy, with a low around 22. North wind 5 to 8 mph.
Monday
Mostly sunny, with a high near 37. North northeast wind around 6 mph becoming light and variable in the afternoon.
Monday Night
Partly cloudy, with a low around 24. Calm wind becoming south southwest 5 to 7 mph after midnight.
Tuesday
Mostly sunny, with a high near 46. Southwest wind 7 to 11 mph, with gusts as high as 18 mph.
Tuesday Night
Mostly cloudy, with a low around 34. South southwest wind 7 to 10 mph.
Wednesday
A chance of showers. Mostly cloudy, with a high near 51. South southwest wind 9 to 13 mph, with gusts as high as 21 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:
12:46 am CST Dec 4, 2025
Forecast Valid:
1am CST Dec 4, 2025-6pm CST Dec 10, 2025
 
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