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.

N/A

Humidity NA
Wind Speed NA
Barometer NA
Dewpoint N/A
Visibility NA
Last update *** Not a current observation ***
Extended Forecast for

Marion IL

  • Today

    Today: Sunny, with a high near 62. Calm wind becoming southeast 5 to 9 mph in the morning.

    High: 62 °F

    Sunny

  • Tonight

    Tonight: Showers and thunderstorms likely, then showers and possibly a thunderstorm after 4am. Low around 49. South southeast wind 6 to 10 mph. Chance of precipitation is 80%.

    Low: 49 °F

    Chance
    T-storms then
    Showers

  • Tuesday

    Tuesday: Showers likely and possibly a thunderstorm before noon, then a chance of showers and thunderstorms after noon. Partly sunny, with a high near 73. South southwest wind 7 to 13 mph, with gusts as high as 20 mph. Chance of precipitation is 60%.

    High: 73 °F

    Showers
    Likely then
    Chance
    T-storms

  • Tuesday Night

    Tuesday Night: A 30 percent chance of showers before midnight. Partly cloudy, with a low around 50. Southwest wind around 6 mph becoming calm in the evening.

    Low: 50 °F

    Chance
    Showers then
    Mostly Cloudy

  • Wednesday

    Wednesday: Mostly cloudy, with a high near 65. Calm wind becoming north northwest around 5 mph.

    High: 65 °F

    Mostly Cloudy

  • Wednesday Night

    Wednesday Night: A 50 percent chance of showers, mainly after midnight. Mostly cloudy, with a low around 50. Light and variable wind.

    Low: 50 °F

    Slight Chance
    Showers then
    Chance
    Showers

  • Thursday

    Thursday: Showers and possibly a thunderstorm. High near 67. Light southeast wind becoming south 5 to 9 mph in the morning. Chance of precipitation is 90%.

    High: 67 °F

    Showers

  • Thursday Night

    Thursday Night: Showers and possibly a thunderstorm. Cloudy, with a low around 57. South southwest wind 6 to 8 mph.

    Low: 57 °F

    Showers

  • Friday

    Friday: Showers likely, mainly before noon. Mostly cloudy, with a high near 68. South southwest wind 8 to 11 mph, with gusts as high as 18 mph.

    High: 68 °F

    Showers
    Likely

Detailed Forecast

Today
Sunny, with a high near 62. Calm wind becoming southeast 5 to 9 mph in the morning.
Tonight
Showers and thunderstorms likely, then showers and possibly a thunderstorm after 4am. Low around 49. South southeast wind 6 to 10 mph. Chance of precipitation is 80%.
Tuesday
Showers likely and possibly a thunderstorm before noon, then a chance of showers and thunderstorms after noon. Partly sunny, with a high near 73. South southwest wind 7 to 13 mph, with gusts as high as 20 mph. Chance of precipitation is 60%.
Tuesday Night
A 30 percent chance of showers before midnight. Partly cloudy, with a low around 50. Southwest wind around 6 mph becoming calm in the evening.
Wednesday
Mostly cloudy, with a high near 65. Calm wind becoming north northwest around 5 mph.
Wednesday Night
A 50 percent chance of showers, mainly after midnight. Mostly cloudy, with a low around 50. Light and variable wind.
Thursday
Showers and possibly a thunderstorm. High near 67. Light southeast wind becoming south 5 to 9 mph in the morning. Chance of precipitation is 90%.
Thursday Night
Showers and possibly a thunderstorm. Cloudy, with a low around 57. South southwest wind 6 to 8 mph.
Friday
Showers likely, mainly before noon. Mostly cloudy, with a high near 68. South southwest wind 8 to 11 mph, with gusts as high as 18 mph.
Friday Night
A chance of showers and thunderstorms before midnight, then a slight chance of showers. Mostly cloudy, with a low around 47. Southwest wind 6 to 8 mph becoming west northwest after midnight.
Saturday
Partly sunny, with a high near 58. West northwest wind 5 to 8 mph.
Saturday Night
Mostly cloudy, with a low around 41. Light northwest wind.
Sunday
A slight chance of showers. Mostly sunny, with a high near 58. Calm wind becoming west northwest 5 to 7 mph in the morning.
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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:
3:16 am CST Nov 17, 2025
Forecast Valid:
4am CST Nov 17, 2025-6pm CST Nov 23, 2025
 
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