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

37°F

3°C

Humidity 66%
Wind Speed S 7 mph
Barometer 30.12 in
Dewpoint 27°F (-3°C)
Visibility 10.00 mi
Wind Chill32°F (0°C)
Last update 13 Jan 1:55 am CST
Extended Forecast for

Marion IL

  • Overnight

    Overnight: Mostly clear, with a low around 38. South southwest wind 8 to 10 mph, with gusts as high as 20 mph.

    Low: 38 °F

    Mostly Clear

  • Tuesday

    Tuesday: Mostly sunny, with a high near 60. Southwest wind 10 to 16 mph, with gusts as high as 30 mph.

    High: 60 °F

    Mostly Sunny

  • Tuesday Night

    Tuesday Night: A 40 percent chance of showers, mainly between 10pm and 1am. Cloudy, with a low around 41. Southwest wind 5 to 10 mph becoming light and variable.

    Low: 41 °F

    Chance
    Showers

  • Wednesday

    Wednesday: Partly sunny, with a high near 46. North northwest wind 6 to 11 mph increasing to 12 to 17 mph in the afternoon. Winds could gust as high as 28 mph.

    High: 46 °F

    Partly Sunny

  • Wednesday Night

    Wednesday Night: Mostly clear, with a low around 19. North northwest wind 6 to 16 mph, with gusts as high as 24 mph.

    Low: 19 °F

    Mostly Clear

  • Thursday

    Thursday: Sunny, with a high near 32. North northwest wind 5 to 7 mph becoming light and variable in the afternoon.

    High: 32 °F

    Sunny

  • Thursday Night

    Thursday Night: Mostly cloudy, with a low around 24. Light south southwest wind increasing to 8 to 13 mph in the evening. Winds could gust as high as 22 mph.

    Low: 24 °F

    Mostly Cloudy

  • Friday

    Friday: Partly sunny, with a high near 46. West wind 10 to 15 mph, with gusts as high as 24 mph.

    High: 46 °F

    Partly Sunny

  • Friday Night

    Friday Night: Mostly cloudy, with a low around 24. West wind 7 to 9 mph.

    Low: 24 °F

    Mostly Cloudy

Detailed Forecast

Overnight
Mostly clear, with a low around 38. South southwest wind 8 to 10 mph, with gusts as high as 20 mph.
Tuesday
Mostly sunny, with a high near 60. Southwest wind 10 to 16 mph, with gusts as high as 30 mph.
Tuesday Night
A 40 percent chance of showers, mainly between 10pm and 1am. Cloudy, with a low around 41. Southwest wind 5 to 10 mph becoming light and variable.
Wednesday
Partly sunny, with a high near 46. North northwest wind 6 to 11 mph increasing to 12 to 17 mph in the afternoon. Winds could gust as high as 28 mph.
Wednesday Night
Mostly clear, with a low around 19. North northwest wind 6 to 16 mph, with gusts as high as 24 mph.
Thursday
Sunny, with a high near 32. North northwest wind 5 to 7 mph becoming light and variable in the afternoon.
Thursday Night
Mostly cloudy, with a low around 24. Light south southwest wind increasing to 8 to 13 mph in the evening. Winds could gust as high as 22 mph.
Friday
Partly sunny, with a high near 46. West wind 10 to 15 mph, with gusts as high as 24 mph.
Friday Night
Mostly cloudy, with a low around 24. West wind 7 to 9 mph.
Saturday
Partly sunny, with a high near 34. West wind 9 to 14 mph, with gusts as high as 22 mph.
Saturday Night
Mostly cloudy, with a low around 12. West northwest wind 7 to 9 mph.
Sunday
Mostly sunny, with a high near 27. West northwest wind 8 to 11 mph, with gusts as high as 20 mph.
Sunday Night
Mostly clear, with a low around 13. West wind around 7 mph.
M.L.King Day
Sunny, with a high near 36. West southwest wind 6 to 10 mph, with gusts as high as 18 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:
1:51 am CST Jan 13, 2026
Forecast Valid:
2am CST Jan 13, 2026-6pm CST Jan 19, 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