National Oceanic and Atmospheric Administration National Weather Service United States Department of Commerce

Hazardous Weather Conditions

Current conditions at

Marion - Williamson County Regional Airport (KMWA)

Lat: 37.77°NLon: 89.01°WElev: 486ft.

Fair

64°F

18°C

Humidity 30%
Wind Speed E 5 mph
Barometer 30.04 in
Dewpoint 32°F (0°C)
Visibility 10.00 mi
Last update 28 Feb 11:47 am CST
Extended Forecast for

Marion IL

  • This Afternoon

    This Afternoon: A 20 percent chance of showers after 3pm. Partly sunny, with a high near 68. Southeast wind 5 to 7 mph becoming south southwest.

    High: 68 °F

    Slight Chance
    Showers

  • Tonight

    Tonight: A 20 percent chance of showers before 10pm. Mostly cloudy, then gradually becoming mostly clear, with a low around 35. Light and variable wind becoming north 5 to 10 mph in the evening. Winds could gust as high as 18 mph.

    Low: 35 °F

    Slight Chance
    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%.

    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 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

Detailed Forecast

This Afternoon
A 20 percent chance of showers after 3pm. Partly sunny, with a high near 68. Southeast wind 5 to 7 mph becoming south southwest.
Tonight
A 20 percent chance of showers before 10pm. Mostly cloudy, then gradually becoming mostly clear, with a low around 35. Light and variable wind becoming north 5 to 10 mph in the evening. Winds could gust as high as 18 mph.
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%.
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 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.
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ABOUT THIS FORECAST

 
Point Forecast:
Marion IL
 37.73°N 88.92°W
Last Update:
12:26 pm CST Feb 28, 2026
Forecast Valid:
12pm CST Feb 28, 2026-6pm CST Mar 6, 2026
 
Forecast Discussion
 
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Additional Resources

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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