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

39°F

4°C

Humidity 93%
Wind Speed SW 3 mph
Barometer 30.32 in
Dewpoint 37°F (3°C)
Visibility 10.00 mi
Last update 6 Apr 1:55 am CDT
Extended Forecast for

Marion IL

  • Overnight

    Overnight: Patchy frost between 3am and 4am. Otherwise, clear, with a low around 37. Calm wind.

    Low: 37 °F

    Patchy Frost

  • Monday

    Monday: Sunny, with a high near 67. Light and variable wind becoming northwest 6 to 11 mph in the morning. Winds could gust as high as 18 mph.

    High: 67 °F

    Sunny

  • Monday Night

    Monday Night: Mostly clear, with a low around 41. Northeast wind around 6 mph.

    Low: 41 °F

    Mostly Clear

  • Tuesday

    Tuesday: Partly sunny, with a high near 58. East northeast wind 8 to 10 mph.

    High: 58 °F

    Partly Sunny

  • Tuesday Night

    Tuesday Night: Partly cloudy, with a low around 40. East wind around 6 mph.

    Low: 40 °F

    Partly Cloudy

  • Wednesday

    Wednesday: Partly sunny, with a high near 74. South wind 6 to 10 mph, with gusts as high as 18 mph.

    High: 74 °F

    Partly Sunny

  • Wednesday Night

    Wednesday Night: Mostly cloudy, with a low around 53. South wind 7 to 9 mph, with gusts as high as 18 mph.

    Low: 53 °F

    Mostly Cloudy

  • Thursday

    Thursday: Mostly sunny, with a high near 73. South wind 9 to 11 mph, with gusts as high as 20 mph.

    High: 73 °F

    Mostly Sunny

  • Thursday Night

    Thursday Night: A slight chance of showers and thunderstorms after 1am. Partly cloudy, with a low around 58. South wind around 6 mph.

    Low: 58 °F

    Partly Cloudy
    then Slight
    Chance
    T-storms

Detailed Forecast

Overnight
Patchy frost between 3am and 4am. Otherwise, clear, with a low around 37. Calm wind.
Monday
Sunny, with a high near 67. Light and variable wind becoming northwest 6 to 11 mph in the morning. Winds could gust as high as 18 mph.
Monday Night
Mostly clear, with a low around 41. Northeast wind around 6 mph.
Tuesday
Partly sunny, with a high near 58. East northeast wind 8 to 10 mph.
Tuesday Night
Partly cloudy, with a low around 40. East wind around 6 mph.
Wednesday
Partly sunny, with a high near 74. South wind 6 to 10 mph, with gusts as high as 18 mph.
Wednesday Night
Mostly cloudy, with a low around 53. South wind 7 to 9 mph, with gusts as high as 18 mph.
Thursday
Mostly sunny, with a high near 73. South wind 9 to 11 mph, with gusts as high as 20 mph.
Thursday Night
A slight chance of showers and thunderstorms after 1am. Partly cloudy, with a low around 58. South wind around 6 mph.
Friday
A chance of showers and thunderstorms. Partly sunny, with a high near 77. South southwest wind 5 to 8 mph.
Friday Night
A slight chance of showers and thunderstorms. Partly cloudy, with a low around 58. Southwest wind around 5 mph becoming light and variable in the evening.
Saturday
A slight chance of showers and thunderstorms. Mostly sunny, with a high near 82. South wind 5 to 8 mph.
Saturday Night
Partly cloudy, with a low around 62. South southeast wind around 6 mph.
Sunday
A slight chance of showers and thunderstorms. Partly sunny, with a high near 84. South southwest wind 7 to 14 mph, with gusts as high as 23 mph.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Marion IL
 37.73°N 88.95°W
Last Update:
1:26 am CDT Apr 6, 2026
Forecast Valid:
2am CDT Apr 6, 2026-6pm CDT Apr 12, 2026
 
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Additional Resources

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High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation