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

73°F

23°C

Humidity 65%
Wind Speed N 9 mph
Barometer 30.21 in
Dewpoint 61°F (16°C)
Visibility 10.00 mi
Last update 24 Sep 4:45 pm CDT
Extended Forecast for

Marion IL

  • This Afternoon

    This Afternoon: Mostly cloudy, with a high near 74. North wind around 7 mph.

    High: 74 °F

    Mostly Cloudy

  • Tonight

    Tonight: Mostly cloudy, with a low around 59. North northeast wind around 5 mph becoming calm in the evening.

    Low: 59 °F

    Mostly Cloudy

  • Friday

    Friday: Mostly sunny, with a high near 80. Calm wind becoming northeast 5 to 8 mph in the morning.

    High: 80 °F

    Mostly Sunny

  • Friday Night

    Friday Night: Increasing clouds, with a low around 57. Northeast wind around 5 mph becoming calm in the evening.

    Low: 57 °F

    Increasing
    Clouds

  • Saturday

    Saturday: Mostly cloudy, with a high near 75. Calm wind becoming east northeast around 5 mph in the afternoon.

    High: 75 °F

    Mostly Cloudy

  • Saturday Night

    Saturday Night: Mostly cloudy, with a low around 58. Calm wind.

    Low: 58 °F

    Mostly Cloudy

  • Sunday

    Sunday: Partly sunny, with a high near 78. Calm wind becoming northeast around 5 mph in the afternoon.

    High: 78 °F

    Partly Sunny

  • Sunday Night

    Sunday Night: Partly cloudy, with a low around 54. Calm wind.

    Low: 54 °F

    Partly Cloudy

  • Monday

    Monday: Sunny, with a high near 81. Calm wind becoming east southeast around 5 mph in the afternoon.

    High: 81 °F

    Sunny

Detailed Forecast

This Afternoon
Mostly cloudy, with a high near 74. North wind around 7 mph.
Tonight
Mostly cloudy, with a low around 59. North northeast wind around 5 mph becoming calm in the evening.
Friday
Mostly sunny, with a high near 80. Calm wind becoming northeast 5 to 8 mph in the morning.
Friday Night
Increasing clouds, with a low around 57. Northeast wind around 5 mph becoming calm in the evening.
Saturday
Mostly cloudy, with a high near 75. Calm wind becoming east northeast around 5 mph in the afternoon.
Saturday Night
Mostly cloudy, with a low around 58. Calm wind.
Sunday
Partly sunny, with a high near 78. Calm wind becoming northeast around 5 mph in the afternoon.
Sunday Night
Partly cloudy, with a low around 54. Calm wind.
Monday
Sunny, with a high near 81. Calm wind becoming east southeast around 5 mph in the afternoon.
Monday Night
Mostly clear, with a low around 59. Calm wind.
Tuesday
Mostly sunny, with a high near 84. Light southeast wind becoming south 5 to 10 mph in the morning.
Tuesday Night
A chance of showers. Mostly cloudy, with a low around 67. South southeast wind 7 to 13 mph.
Wednesday
A chance of showers. Partly sunny, with a high near 83. South southwest wind 14 to 17 mph, with gusts as high as 22 mph.
Basemap Options
Click map to change the forecast location
Loading map...
Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Marion IL
 37.76°N 88.97°W
Last Update:
4:06 pm CDT Sep 24, 2026
Forecast Valid:
4pm CDT Sep 24, 2026-6pm CDT Sep 30, 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