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

38°F

3°C

Humidity 93%
Wind Speed Calm
Barometer 29.94 in
Dewpoint 37°F (3°C)
Visibility 10.00 mi
Last update 26 Feb 10:35 pm CST
Extended Forecast for

Marion IL

  • Tonight

    Tonight: Clear, with a low around 36. Calm wind.

    Low: 36 °F

    Clear

  • Friday

    Friday: Patchy fog before 8am. Otherwise, sunny, with a high near 68. Calm wind becoming southwest 5 to 9 mph in the morning.

    High: 68 °F

    Patchy Fog
    then Sunny

  • Friday Night

    Friday Night: Mostly clear, with a low around 43. South wind around 6 mph becoming light and variable after midnight.

    Low: 43 °F

    Mostly Clear

  • Saturday

    Saturday: Mostly sunny, with a high near 68. Light and variable wind becoming south 5 to 8 mph in the morning.

    High: 68 °F

    Mostly Sunny

  • Saturday Night

    Saturday Night: A 20 percent chance of showers before midnight. Mostly clear, with a low around 35. South wind 6 to 10 mph becoming north in the evening. Winds could gust as high as 18 mph.

    Low: 35 °F

    Slight Chance
    Showers then
    Partly Cloudy

  • Sunday

    Sunday: A 20 percent chance of showers after noon. Mostly cloudy, with a high near 47. Northeast wind around 10 mph, with gusts as high as 18 mph.

    High: 47 °F

    Mostly Cloudy
    then Slight
    Chance
    Showers

  • Sunday Night

    Sunday Night: Rain and snow showers likely. Cloudy, with a low around 34. Northeast wind around 9 mph. Chance of precipitation is 70%.

    Low: 34 °F

    Rain/Snow
    Likely

  • Monday

    Monday: A chance of rain and snow showers before noon. Mostly cloudy, with a high near 45. East northeast wind 7 to 10 mph.

    High: 45 °F

    Chance
    Rain/Snow
    then Mostly
    Cloudy

  • Monday Night

    Monday Night: A chance of showers, mainly after midnight. Mostly cloudy, with a low around 33. East wind around 6 mph.

    Low: 33 °F

    Chance
    Showers

Detailed Forecast

Tonight
Clear, with a low around 36. Calm wind.
Friday
Patchy fog before 8am. Otherwise, sunny, with a high near 68. Calm wind becoming southwest 5 to 9 mph in the morning.
Friday Night
Mostly clear, with a low around 43. South wind around 6 mph becoming light and variable after midnight.
Saturday
Mostly sunny, with a high near 68. Light and variable wind becoming south 5 to 8 mph in the morning.
Saturday Night
A 20 percent chance of showers before midnight. Mostly clear, with a low around 35. South wind 6 to 10 mph becoming north in the evening. Winds could gust as high as 18 mph.
Sunday
A 20 percent chance of showers after noon. Mostly cloudy, with a high near 47. Northeast wind around 10 mph, with gusts as high as 18 mph.
Sunday Night
Rain and snow showers likely. Cloudy, with a low around 34. Northeast wind around 9 mph. Chance of precipitation is 70%.
Monday
A chance of rain and snow showers before noon. Mostly cloudy, with a high near 45. East northeast wind 7 to 10 mph.
Monday Night
A chance of showers, mainly after midnight. Mostly cloudy, with a low around 33. East wind around 6 mph.
Tuesday
A chance of showers. Cloudy, with a high near 52. East wind 6 to 8 mph becoming south in the afternoon.
Tuesday Night
Showers likely. Cloudy, with a low around 42. South wind around 6 mph.
Wednesday
A chance of showers. Cloudy, with a high near 62. South wind 6 to 10 mph.
Wednesday Night
A chance of showers. Cloudy, with a low around 52. South wind 8 to 11 mph, with gusts as high as 20 mph.
Thursday
Showers and thunderstorms likely. Cloudy, with a high near 68. South southwest wind 10 to 14 mph, with gusts as high as 22 mph.
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ABOUT THIS FORECAST

 
Point Forecast:
Marion IL
 37.73°N 88.92°W
Last Update:
9:13 pm CST Feb 26, 2026
Forecast Valid:
10pm CST Feb 26, 2026-6pm CST Mar 5, 2026
 
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Additional Resources

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High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation