National Oceanic and Atmospheric Administration National Weather Service United States Department of Commerce

Hazardous Weather Conditions

Current conditions at

Marion - Williamson County Regional Airport (KMWA)

Lat: 37.77°NLon: 89.01°WElev: 486ft.

Fair

69°F

21°C

Humidity 77%
Wind Speed S 13 mph
Barometer 30.00 in
Dewpoint 62°F (17°C)
Visibility 10.00 mi
Last update 6 Mar 8:15 pm CST
Extended Forecast for

Marion IL

  • Tonight

    Tonight: Showers and thunderstorms likely, mainly after 5am. Mostly cloudy, with a low around 64. South wind 10 to 14 mph, with gusts as high as 24 mph. Chance of precipitation is 60%.

    Low: 64 °F

    Mostly Cloudy
    then T-storms
    Likely

  • Saturday

    Saturday: Showers and thunderstorms, mainly before 11am. High near 73. South southwest wind 10 to 14 mph becoming west northwest in the afternoon. Winds could gust as high as 23 mph. Chance of precipitation is 90%.

    High: 73 °F

    T-storms then
    Chance
    T-storms

  • Saturday Night

    Saturday Night: A slight chance of showers and thunderstorms before 9pm, then a slight chance of showers between 9pm and midnight. Mostly cloudy, with a low around 41. Northwest wind 5 to 9 mph becoming calm after midnight. Chance of precipitation is 20%.

    Low: 41 °F

    Slight Chance
    T-storms then
    Partly Cloudy

  • Sunday

    Sunday: Sunny, with a high near 65. Calm wind becoming west southwest around 6 mph in the afternoon.

    High: 65 °F

    Sunny

  • Sunday Night

    Sunday Night: Clear, with a low around 46. South southwest wind 3 to 5 mph.

    Low: 46 °F

    Clear

  • Monday

    Monday: Sunny, with a high near 74. South southwest wind 6 to 14 mph, with gusts as high as 24 mph.

    High: 74 °F

    Sunny

  • Monday Night

    Monday Night: A 40 percent chance of showers and thunderstorms, mainly after midnight. Partly cloudy, with a low around 61. South southwest wind 7 to 10 mph, with gusts as high as 18 mph.

    Low: 61 °F

    Slight Chance
    T-storms then
    Chance
    Showers

  • Tuesday

    Tuesday: Showers likely and possibly a thunderstorm. Mostly cloudy, with a high near 78. South southwest wind 7 to 15 mph, with gusts as high as 24 mph.

    High: 78 °F

    Showers
    Likely

  • Tuesday Night

    Tuesday Night: Showers and possibly a thunderstorm. Cloudy, with a low around 58. South southwest wind 11 to 14 mph, with gusts as high as 22 mph.

    Low: 58 °F

    Showers

Detailed Forecast

Tonight
Showers and thunderstorms likely, mainly after 5am. Mostly cloudy, with a low around 64. South wind 10 to 14 mph, with gusts as high as 24 mph. Chance of precipitation is 60%.
Saturday
Showers and thunderstorms, mainly before 11am. High near 73. South southwest wind 10 to 14 mph becoming west northwest in the afternoon. Winds could gust as high as 23 mph. Chance of precipitation is 90%.
Saturday Night
A slight chance of showers and thunderstorms before 9pm, then a slight chance of showers between 9pm and midnight. Mostly cloudy, with a low around 41. Northwest wind 5 to 9 mph becoming calm after midnight. Chance of precipitation is 20%.
Sunday
Sunny, with a high near 65. Calm wind becoming west southwest around 6 mph in the afternoon.
Sunday Night
Clear, with a low around 46. South southwest wind 3 to 5 mph.
Monday
Sunny, with a high near 74. South southwest wind 6 to 14 mph, with gusts as high as 24 mph.
Monday Night
A 40 percent chance of showers and thunderstorms, mainly after midnight. Partly cloudy, with a low around 61. South southwest wind 7 to 10 mph, with gusts as high as 18 mph.
Tuesday
Showers likely and possibly a thunderstorm. Mostly cloudy, with a high near 78. South southwest wind 7 to 15 mph, with gusts as high as 24 mph.
Tuesday Night
Showers and possibly a thunderstorm. Cloudy, with a low around 58. South southwest wind 11 to 14 mph, with gusts as high as 22 mph.
Wednesday
Showers and possibly a thunderstorm before noon, then showers likely. Cloudy, with a high near 67. Southwest wind 11 to 14 mph becoming north northwest in the afternoon. Winds could gust as high as 23 mph.
Wednesday Night
A chance of showers. Mostly cloudy, with a low around 38. North wind 7 to 11 mph, with gusts as high as 20 mph.
Thursday
Partly sunny, with a high near 58. North northeast wind 6 to 9 mph.
Thursday Night
Mostly clear, with a low around 39. East wind 5 to 7 mph becoming south after midnight.
Friday
Sunny, with a high near 65. South southwest wind 8 to 14 mph, with gusts as high as 23 mph.
Basemap Options
Click map to change the forecast location
Loading map...
Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Marion IL
 37.73°N 88.92°W
Last Update:
2:26 pm CST Mar 6, 2026
Forecast Valid:
8pm CST Mar 6, 2026-6pm CDT Mar 13, 2026
 
Forecast Discussion
 
Get as KML Get as XML

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