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

56°F

13°C

Humidity 96%
Wind Speed S 10 mph
Barometer 29.70 in
Dewpoint 55°F (13°C)
Visibility 10.00 mi
Last update 18 Feb 8:15 pm CST
Extended Forecast for

Marion IL

  • Tonight

    Tonight: Patchy fog after 4am. Otherwise, increasing clouds, with a low around 54. South wind around 7 mph, with gusts as high as 18 mph.

    Low: 54 °F

    Partly Cloudy
    then Patchy
    Fog

  • Thursday

    Thursday: Showers and thunderstorms likely, mainly before 3pm. Patchy fog before 8am. Otherwise, mostly cloudy, with a high near 71. South southwest wind 7 to 17 mph, with gusts as high as 33 mph. Chance of precipitation is 70%.

    High: 71 °F

    Chance
    Showers and
    Patchy Fog
    then Showers
    Likely

  • Thursday Night

    Thursday Night: A 20 percent chance of showers before 9pm. Mostly clear, with a low around 43. West southwest wind 9 to 14 mph, with gusts as high as 26 mph.

    Low: 43 °F

    Slight Chance
    Showers then
    Mostly Clear

  • Friday

    Friday: Sunny, with a high near 56. West wind 5 to 11 mph, with gusts as high as 20 mph.

    High: 56 °F

    Sunny

  • Friday Night

    Friday Night: Mostly cloudy, with a low around 34. Calm wind becoming north around 5 mph after midnight.

    Low: 34 °F

    Mostly Cloudy

  • Saturday

    Saturday: A 20 percent chance of showers after noon. Mostly sunny, with a high near 48. North wind 5 to 9 mph.

    High: 48 °F

    Mostly Sunny
    then Slight
    Chance
    Showers

  • Saturday Night

    Saturday Night: A slight chance of rain and snow showers before midnight. Mostly clear, with a low around 26. Northwest wind 7 to 10 mph, with gusts as high as 20 mph. Chance of precipitation is 20%.

    Low: 26 °F

    Slight Chance
    Rain/Snow
    then Mostly
    Clear

  • Sunday

    Sunday: Sunny, with a high near 42. Northwest wind 10 to 15 mph, with gusts as high as 24 mph.

    High: 42 °F

    Sunny

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 21. North northwest wind 8 to 10 mph, with gusts as high as 18 mph.

    Low: 21 °F

    Mostly Clear

Detailed Forecast

Tonight
Patchy fog after 4am. Otherwise, increasing clouds, with a low around 54. South wind around 7 mph, with gusts as high as 18 mph.
Thursday
Showers and thunderstorms likely, mainly before 3pm. Patchy fog before 8am. Otherwise, mostly cloudy, with a high near 71. South southwest wind 7 to 17 mph, with gusts as high as 33 mph. Chance of precipitation is 70%.
Thursday Night
A 20 percent chance of showers before 9pm. Mostly clear, with a low around 43. West southwest wind 9 to 14 mph, with gusts as high as 26 mph.
Friday
Sunny, with a high near 56. West wind 5 to 11 mph, with gusts as high as 20 mph.
Friday Night
Mostly cloudy, with a low around 34. Calm wind becoming north around 5 mph after midnight.
Saturday
A 20 percent chance of showers after noon. Mostly sunny, with a high near 48. North wind 5 to 9 mph.
Saturday Night
A slight chance of rain and snow showers before midnight. Mostly clear, with a low around 26. Northwest wind 7 to 10 mph, with gusts as high as 20 mph. Chance of precipitation is 20%.
Sunday
Sunny, with a high near 42. Northwest wind 10 to 15 mph, with gusts as high as 24 mph.
Sunday Night
Mostly clear, with a low around 21. North northwest wind 8 to 10 mph, with gusts as high as 18 mph.
Monday
Sunny, with a high near 40. North northwest wind 6 to 11 mph, with gusts as high as 18 mph.
Monday Night
Mostly clear, with a low around 20. Light and variable wind.
Tuesday
Mostly sunny, with a high near 48. Light south wind increasing to 6 to 11 mph in the morning. Winds could gust as high as 20 mph.
Tuesday Night
Mostly cloudy, with a low around 37. South southwest wind 9 to 11 mph, with gusts as high as 22 mph.
Wednesday
A chance of showers. Partly sunny, with a high near 58. Southwest wind 11 to 16 mph, with gusts as high as 25 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:
5:41 pm CST Feb 18, 2026
Forecast Valid:
8pm CST Feb 18, 2026-6pm CST Feb 25, 2026
 
Forecast Discussion
 
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Additional Resources

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Chance of Precipitation