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

63°F

17°C

Humidity 24%
Wind Speed NE 5 mph
Barometer 30.21 in
Dewpoint 25°F (-4°C)
Visibility 10.00 mi
Last update 24 Mar 3:47 pm CDT
Extended Forecast for

Marion IL

  • This Afternoon

    This Afternoon: Mostly sunny, with a high near 64. East northeast wind around 6 mph.

    High: 64 °F

    Mostly Sunny

  • Tonight

    Tonight: Mostly cloudy, with a low around 45. East wind around 5 mph becoming calm in the evening.

    Low: 45 °F

    Mostly Cloudy

  • Wednesday

    Wednesday: Mostly sunny, with a high near 75. Light south southeast wind becoming south southwest 5 to 10 mph in the morning. Winds could gust as high as 18 mph.

    High: 75 °F

    Mostly Sunny

  • Wednesday Night

    Wednesday Night: Mostly clear, with a low around 61. South wind 8 to 11 mph, with gusts as high as 22 mph.

    Low: 61 °F

    Mostly Clear

  • Thursday

    Thursday: Sunny, with a high near 86. South southwest wind 11 to 17 mph, with gusts as high as 26 mph.

    High: 86 °F

    Sunny

  • Thursday Night

    Thursday Night: A 50 percent chance of showers and thunderstorms after 1am. Mostly cloudy, with a low around 46. South southwest wind 11 to 14 mph becoming north after midnight. Winds could gust as high as 24 mph.

    Low: 46 °F

    Partly Cloudy
    then Chance
    T-storms

  • Friday

    Friday: Showers likely and possibly a thunderstorm. Mostly cloudy, with a high near 55. North wind around 15 mph, with gusts as high as 25 mph. Chance of precipitation is 70%.

    High: 55 °F

    Showers
    Likely

  • Friday Night

    Friday Night: Mostly clear, with a low around 33. North wind 5 to 11 mph, with gusts as high as 18 mph.

    Low: 33 °F

    Mostly Clear

  • Saturday

    Saturday: Sunny, with a high near 59. East wind around 6 mph.

    High: 59 °F

    Sunny

Detailed Forecast

This Afternoon
Mostly sunny, with a high near 64. East northeast wind around 6 mph.
Tonight
Mostly cloudy, with a low around 45. East wind around 5 mph becoming calm in the evening.
Wednesday
Mostly sunny, with a high near 75. Light south southeast wind becoming south southwest 5 to 10 mph in the morning. Winds could gust as high as 18 mph.
Wednesday Night
Mostly clear, with a low around 61. South wind 8 to 11 mph, with gusts as high as 22 mph.
Thursday
Sunny, with a high near 86. South southwest wind 11 to 17 mph, with gusts as high as 26 mph.
Thursday Night
A 50 percent chance of showers and thunderstorms after 1am. Mostly cloudy, with a low around 46. South southwest wind 11 to 14 mph becoming north after midnight. Winds could gust as high as 24 mph.
Friday
Showers likely and possibly a thunderstorm. Mostly cloudy, with a high near 55. North wind around 15 mph, with gusts as high as 25 mph. Chance of precipitation is 70%.
Friday Night
Mostly clear, with a low around 33. North wind 5 to 11 mph, with gusts as high as 18 mph.
Saturday
Sunny, with a high near 59. East wind around 6 mph.
Saturday Night
Partly cloudy, with a low around 39. Light southeast wind.
Sunday
Mostly sunny, with a high near 65. Light southeast wind becoming south 5 to 9 mph in the morning.
Sunday Night
Mostly cloudy, with a low around 52. South wind around 8 mph.
Monday
Mostly sunny, with a high near 78. South southwest wind 8 to 13 mph, with gusts as high as 21 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:
4:31 pm CDT Mar 24, 2026
Forecast Valid:
4pm CDT Mar 24, 2026-6pm CDT Mar 30, 2026
 
Forecast Discussion
 
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Additional Resources

Radar & Satellite Image

Link to Local Radar Data Link to Satellite Data

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