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

61°F

16°C

Humidity 82%
Wind Speed Calm
Barometer 30.08 in
Dewpoint 55°F (13°C)
Visibility 10.00 mi
Last update 4 Mar 2:35 am CST
Extended Forecast for

Marion IL

  • Overnight

    Overnight: A 30 percent chance of showers and thunderstorms, mainly after 5am. Mostly cloudy, with a low around 58. South wind around 6 mph.

    Low: 58 °F

    Chance
    Showers

  • Wednesday

    Wednesday: A chance of showers and thunderstorms before 3pm, then showers likely and possibly a thunderstorm between 3pm and 5pm, then a chance of showers and thunderstorms after 5pm. Mostly cloudy, with a high near 73. South wind 6 to 10 mph, with gusts as high as 18 mph. Chance of precipitation is 60%.

    High: 73 °F

    Chance
    T-storms then
    Showers
    Likely

  • Wednesday Night

    Wednesday Night: Showers and thunderstorms likely, then showers and possibly a thunderstorm after 9pm. Low around 60. South southwest wind 6 to 8 mph. Chance of precipitation is 100%.

    Low: 60 °F

    Showers
    Likely then
    Showers

  • Thursday

    Thursday: Showers and possibly a thunderstorm. High near 72. Southwest wind 7 to 11 mph, with gusts as high as 20 mph. Chance of precipitation is 90%.

    High: 72 °F

    Showers

  • Thursday Night

    Thursday Night: A chance of showers and thunderstorms. Mostly cloudy, with a low around 60. South wind 3 to 7 mph. Chance of precipitation is 40%.

    Low: 60 °F

    Chance
    T-storms then
    Chance
    Showers

  • Friday

    Friday: A 20 percent chance of showers. Partly sunny, with a high near 79. South wind 8 to 16 mph, with gusts as high as 26 mph.

    High: 79 °F

    Slight Chance
    Showers

  • Friday Night

    Friday Night: A slight chance of showers, then showers likely and possibly a thunderstorm after midnight. Mostly cloudy, with a low around 60. South wind 10 to 13 mph, with gusts as high as 23 mph. Chance of precipitation is 70%.

    Low: 60 °F

    Slight Chance
    Showers then
    Showers
    Likely

  • Saturday

    Saturday: Showers and possibly a thunderstorm before noon, then a chance of showers. Mostly cloudy, with a high near 69. South southwest wind 7 to 11 mph becoming northwest in the afternoon. Winds could gust as high as 21 mph.

    High: 69 °F

    Showers

  • Saturday Night

    Saturday Night: A slight chance of showers. Partly cloudy, with a low around 43. Northwest wind around 6 mph becoming calm in the evening.

    Low: 43 °F

    Slight Chance
    Showers

Detailed Forecast

Overnight
A 30 percent chance of showers and thunderstorms, mainly after 5am. Mostly cloudy, with a low around 58. South wind around 6 mph.
Wednesday
A chance of showers and thunderstorms before 3pm, then showers likely and possibly a thunderstorm between 3pm and 5pm, then a chance of showers and thunderstorms after 5pm. Mostly cloudy, with a high near 73. South wind 6 to 10 mph, with gusts as high as 18 mph. Chance of precipitation is 60%.
Wednesday Night
Showers and thunderstorms likely, then showers and possibly a thunderstorm after 9pm. Low around 60. South southwest wind 6 to 8 mph. Chance of precipitation is 100%.
Thursday
Showers and possibly a thunderstorm. High near 72. Southwest wind 7 to 11 mph, with gusts as high as 20 mph. Chance of precipitation is 90%.
Thursday Night
A chance of showers and thunderstorms. Mostly cloudy, with a low around 60. South wind 3 to 7 mph. Chance of precipitation is 40%.
Friday
A 20 percent chance of showers. Partly sunny, with a high near 79. South wind 8 to 16 mph, with gusts as high as 26 mph.
Friday Night
A slight chance of showers, then showers likely and possibly a thunderstorm after midnight. Mostly cloudy, with a low around 60. South wind 10 to 13 mph, with gusts as high as 23 mph. Chance of precipitation is 70%.
Saturday
Showers and possibly a thunderstorm before noon, then a chance of showers. Mostly cloudy, with a high near 69. South southwest wind 7 to 11 mph becoming northwest in the afternoon. Winds could gust as high as 21 mph.
Saturday Night
A slight chance of showers. Partly cloudy, with a low around 43. Northwest wind around 6 mph becoming calm in the evening.
Sunday
Mostly sunny, with a high near 66. Calm wind becoming southwest around 6 mph in the morning.
Sunday Night
Mostly clear, with a low around 50. Light south southwest wind.
Monday
Mostly sunny, with a high near 76. Light south southwest wind increasing to 5 to 10 mph in the morning.
Monday Night
A chance of showers. Partly cloudy, with a low around 61. South southwest wind 7 to 9 mph, with gusts as high as 20 mph.
Tuesday
A chance of showers and thunderstorms. Mostly cloudy, with a high near 77. South southwest wind 10 to 18 mph, with gusts as high as 29 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:
1:36 am CST Mar 4, 2026
Forecast Valid:
2am CST Mar 4, 2026-6pm CDT Mar 10, 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