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

32°F

0°C

Humidity 51%
Wind Speed NW 14 mph
Barometer 30.50 in
Dewpoint 16°F (-9°C)
Visibility 10.00 mi
Wind Chill22°F (-6°C)
Last update 11 Jan 9:47 am CST
Extended Forecast for

Marion IL

  • Today

    Today: Sunny, with a high near 40. North northwest wind 6 to 11 mph becoming light west northwest in the afternoon. Winds could gust as high as 20 mph.

    High: 40 °F

    Sunny

  • Tonight

    Tonight: Clear, with a low around 26. Calm wind becoming south southwest around 6 mph after midnight.

    Low: 26 °F

    Clear

  • Monday

    Monday: Sunny, with a high near 50. Southwest wind 6 to 11 mph, with gusts as high as 18 mph.

    High: 50 °F

    Sunny

  • Monday Night

    Monday Night: Partly cloudy, with a low around 36. South southwest wind 6 to 8 mph.

    Low: 36 °F

    Partly Cloudy

  • Tuesday

    Tuesday: Mostly sunny, with a high near 58. Southwest wind 9 to 15 mph, with gusts as high as 24 mph.

    High: 58 °F

    Mostly Sunny

  • Tuesday Night

    Tuesday Night: A 20 percent chance of showers after midnight. Mostly cloudy, with a low around 41. West wind 6 to 10 mph.

    Low: 41 °F

    Mostly Cloudy
    then Slight
    Chance
    Showers

  • Wednesday

    Wednesday: A 20 percent chance of showers. Partly sunny, with a high near 46. Northwest wind 6 to 14 mph, with gusts as high as 23 mph.

    High: 46 °F

    Slight Chance
    Showers

  • Wednesday Night

    Wednesday Night: Mostly cloudy, with a low around 19. North northwest wind 8 to 11 mph, with gusts as high as 21 mph.

    Low: 19 °F

    Mostly Cloudy

  • Thursday

    Thursday: Mostly sunny, with a high near 37. North northwest wind 5 to 8 mph becoming west southwest in the afternoon.

    High: 37 °F

    Mostly Sunny

Detailed Forecast

Today
Sunny, with a high near 40. North northwest wind 6 to 11 mph becoming light west northwest in the afternoon. Winds could gust as high as 20 mph.
Tonight
Clear, with a low around 26. Calm wind becoming south southwest around 6 mph after midnight.
Monday
Sunny, with a high near 50. Southwest wind 6 to 11 mph, with gusts as high as 18 mph.
Monday Night
Partly cloudy, with a low around 36. South southwest wind 6 to 8 mph.
Tuesday
Mostly sunny, with a high near 58. Southwest wind 9 to 15 mph, with gusts as high as 24 mph.
Tuesday Night
A 20 percent chance of showers after midnight. Mostly cloudy, with a low around 41. West wind 6 to 10 mph.
Wednesday
A 20 percent chance of showers. Partly sunny, with a high near 46. Northwest wind 6 to 14 mph, with gusts as high as 23 mph.
Wednesday Night
Mostly cloudy, with a low around 19. North northwest wind 8 to 11 mph, with gusts as high as 21 mph.
Thursday
Mostly sunny, with a high near 37. North northwest wind 5 to 8 mph becoming west southwest in the afternoon.
Thursday Night
Mostly cloudy, with a low around 26. South southwest wind 5 to 8 mph.
Friday
Partly sunny, with a high near 44. West wind 7 to 13 mph, with gusts as high as 21 mph.
Friday Night
Mostly cloudy, with a low around 25. West wind 5 to 7 mph.
Saturday
Partly sunny, with a high near 36. West wind 7 to 11 mph, with gusts as high as 18 mph.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Marion IL
 37.73°N 88.92°W
Last Update:
10:36 am CST Jan 11, 2026
Forecast Valid:
11am CST Jan 11, 2026-6pm CST Jan 17, 2026
 
Forecast Discussion
 
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Additional Resources

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High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation