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.

Overcast

43°F

6°C

Humidity 49%
Wind Speed S 16 G 21 mph
Barometer 30.12 in
Dewpoint 25°F (-4°C)
Visibility 10.00 mi
Wind Chill35°F (2°C)
Last update 18 Mar 9:47 am CDT
Extended Forecast for

Marion IL

  • Today

    Today: Partly sunny, then gradually becoming sunny, with a high near 61. Southwest wind 10 to 15 mph, with gusts as high as 24 mph.

    High: 61 °F

    Becoming
    Sunny

  • Tonight

    Tonight: Increasing clouds, with a low around 43. South wind 3 to 6 mph.

    Low: 43 °F

    Increasing
    Clouds

  • Thursday

    Thursday: Mostly cloudy, then gradually becoming sunny, with a high near 73. South southwest wind 5 to 7 mph.

    High: 73 °F

    Decreasing
    Clouds

  • Thursday Night

    Thursday Night: Mostly clear, with a low around 48. Calm wind.

    Low: 48 °F

    Mostly Clear

  • Friday

    Friday: Sunny, with a high near 78. Calm wind becoming southwest 5 to 8 mph in the morning.

    High: 78 °F

    Sunny

  • Friday Night

    Friday Night: Partly cloudy, with a low around 54. South southwest wind around 5 mph.

    Low: 54 °F

    Partly Cloudy

  • Saturday

    Saturday: Sunny, with a high near 79. West wind 3 to 7 mph.

    High: 79 °F

    Sunny

  • Saturday Night

    Saturday Night: Clear, with a low around 56. South southwest wind 5 to 7 mph.

    Low: 56 °F

    Clear

  • Sunday

    Sunday: Sunny, with a high near 82. South southwest wind 8 to 15 mph, with gusts as high as 23 mph.

    High: 82 °F

    Sunny

Detailed Forecast

Today
Partly sunny, then gradually becoming sunny, with a high near 61. Southwest wind 10 to 15 mph, with gusts as high as 24 mph.
Tonight
Increasing clouds, with a low around 43. South wind 3 to 6 mph.
Thursday
Mostly cloudy, then gradually becoming sunny, with a high near 73. South southwest wind 5 to 7 mph.
Thursday Night
Mostly clear, with a low around 48. Calm wind.
Friday
Sunny, with a high near 78. Calm wind becoming southwest 5 to 8 mph in the morning.
Friday Night
Partly cloudy, with a low around 54. South southwest wind around 5 mph.
Saturday
Sunny, with a high near 79. West wind 3 to 7 mph.
Saturday Night
Clear, with a low around 56. South southwest wind 5 to 7 mph.
Sunday
Sunny, with a high near 82. South southwest wind 8 to 15 mph, with gusts as high as 23 mph.
Sunday Night
Partly cloudy, with a low around 41. North northeast wind 11 to 13 mph, with gusts as high as 22 mph.
Monday
Mostly cloudy, with a high near 57. Northeast wind 11 to 13 mph, with gusts as high as 20 mph.
Monday Night
Mostly cloudy, with a low around 37. Northeast wind 6 to 8 mph.
Tuesday
A slight chance of showers. Partly sunny, with a high near 61. East wind 6 to 8 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:
9:36 am CDT Mar 18, 2026
Forecast Valid:
10am CDT Mar 18, 2026-6pm CDT Mar 24, 2026
 
Forecast Discussion
 
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Additional Resources

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Hourly Weather Forecast

National Digital Forecast Database

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High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation