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.

Light Rain

62°F

17°C

Humidity 41%
Wind Speed Calm
Barometer 30.06 in
Dewpoint 38°F (3°C)
Visibility 10.00 mi
Last update 28 Feb 10:35 pm CST
Extended Forecast for

Marion IL

  • Tonight

    Tonight: Isolated showers before 11pm. Mostly cloudy, then gradually becoming mostly clear, with a low around 35. Light northeast wind becoming north 5 to 10 mph after midnight. Winds could gust as high as 18 mph. Chance of precipitation is 20%.

    Low: 35 °F

    Isolated
    Showers then
    Partly Cloudy

  • Sunday

    Sunday: Partly sunny, with a high near 50. North northeast wind 10 to 13 mph, with gusts as high as 20 mph.

    High: 50 °F

    Partly Sunny

  • Sunday Night

    Sunday Night: Rain showers likely before 3am, then rain likely, possibly mixed with snow showers. Cloudy, with a low around 36. East northeast wind around 8 mph. Chance of precipitation is 70%. Little or no snow accumulation expected.

    Low: 36 °F

    Chance
    Showers then
    Rain/Snow
    Likely

  • Monday

    Monday: Showers likely, mainly before noon. Cloudy, with a high near 48. East wind 6 to 8 mph. Chance of precipitation is 60%.

    High: 48 °F

    Showers
    Likely then
    Slight Chance
    Showers

  • Monday Night

    Monday Night: A 50 percent chance of showers. Cloudy, with a low around 44. East wind 5 to 9 mph becoming south after midnight. Winds could gust as high as 18 mph.

    Low: 44 °F

    Chance
    Showers

  • Tuesday

    Tuesday: A 40 percent chance of showers. Mostly cloudy, with a high near 70. South southwest wind 10 to 16 mph, with gusts as high as 26 mph.

    High: 70 °F

    Chance
    Showers

  • Tuesday Night

    Tuesday Night: A 50 percent chance of showers. Mostly cloudy, with a low around 58. South wind 6 to 9 mph.

    Low: 58 °F

    Chance
    Showers

  • Wednesday

    Wednesday: Showers likely and possibly a thunderstorm. Cloudy, with a high near 71. South southwest wind 7 to 11 mph, with gusts as high as 20 mph.

    High: 71 °F

    Showers
    Likely

  • Wednesday Night

    Wednesday Night: Showers likely and possibly a thunderstorm. Mostly cloudy, with a low around 58. South southwest wind around 8 mph.

    Low: 58 °F

    Showers
    Likely

Detailed Forecast

Tonight
Isolated showers before 11pm. Mostly cloudy, then gradually becoming mostly clear, with a low around 35. Light northeast wind becoming north 5 to 10 mph after midnight. Winds could gust as high as 18 mph. Chance of precipitation is 20%.
Sunday
Partly sunny, with a high near 50. North northeast wind 10 to 13 mph, with gusts as high as 20 mph.
Sunday Night
Rain showers likely before 3am, then rain likely, possibly mixed with snow showers. Cloudy, with a low around 36. East northeast wind around 8 mph. Chance of precipitation is 70%. Little or no snow accumulation expected.
Monday
Showers likely, mainly before noon. Cloudy, with a high near 48. East wind 6 to 8 mph. Chance of precipitation is 60%.
Monday Night
A 50 percent chance of showers. Cloudy, with a low around 44. East wind 5 to 9 mph becoming south after midnight. Winds could gust as high as 18 mph.
Tuesday
A 40 percent chance of showers. Mostly cloudy, with a high near 70. South southwest wind 10 to 16 mph, with gusts as high as 26 mph.
Tuesday Night
A 50 percent chance of showers. Mostly cloudy, with a low around 58. South wind 6 to 9 mph.
Wednesday
Showers likely and possibly a thunderstorm. Cloudy, with a high near 71. South southwest wind 7 to 11 mph, with gusts as high as 20 mph.
Wednesday Night
Showers likely and possibly a thunderstorm. Mostly cloudy, with a low around 58. South southwest wind around 8 mph.
Thursday
Showers likely. Mostly cloudy, with a high near 72. South southwest wind 8 to 13 mph, with gusts as high as 21 mph.
Thursday Night
Showers likely and possibly a thunderstorm. Mostly cloudy, with a low around 60. South wind 6 to 8 mph.
Friday
Showers likely and possibly a thunderstorm. Mostly cloudy, with a high near 75. South southwest wind 7 to 13 mph, with gusts as high as 22 mph.
Friday Night
Showers likely. Mostly cloudy, with a low around 57. South southwest wind 8 to 10 mph, with gusts as high as 20 mph.
Saturday
Showers likely and possibly a thunderstorm. Cloudy, with a high near 68. Southwest wind 9 to 13 mph, with gusts as high as 21 mph.
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ABOUT THIS FORECAST

 
Point Forecast:
Marion IL
 37.73°N 88.92°W
Last Update:
10:01 pm CST Feb 28, 2026
Forecast Valid:
10pm CST Feb 28, 2026-6pm CST Mar 7, 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