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.

A Few Clouds

52°F

11°C

Humidity 38%
Wind Speed S 7 mph
Barometer 30.27 in
Dewpoint 27°F (-3°C)
Visibility 10.00 mi
Wind Chill50°F (10°C)
Last update 12 Feb 12:45 pm CST
Extended Forecast for

Marion IL

  • This Afternoon

    This Afternoon: Mostly sunny, with a high near 52. Southeast wind around 5 mph becoming calm.

    High: 52 °F

    Mostly Sunny

  • Tonight

    Tonight: Mostly clear, with a low around 32. Calm wind.

    Low: 32 °F

    Mostly Clear

  • Friday

    Friday: Sunny, with a high near 58. Calm wind becoming south around 6 mph.

    High: 58 °F

    Sunny

  • Friday Night

    Friday Night: Increasing clouds, with a low around 38. Calm wind.

    Low: 38 °F

    Increasing
    Clouds

  • Saturday

    Saturday: Showers likely, mainly after noon. Cloudy, with a high near 55. Calm wind becoming south southeast around 6 mph in the afternoon. Chance of precipitation is 70%.

    High: 55 °F

    Chance
    Showers then
    Showers
    Likely

  • Saturday Night

    Saturday Night: Showers. Low around 46. East southeast wind around 6 mph. Chance of precipitation is 90%.

    Low: 46 °F

    Showers

  • Sunday

    Sunday: A 50 percent chance of showers, mainly before noon. Mostly cloudy, with a high near 57. Northeast wind 6 to 10 mph.

    High: 57 °F

    Chance
    Showers then
    Slight Chance
    Showers

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 39. North northeast wind around 6 mph becoming calm in the evening.

    Low: 39 °F

    Mostly Clear

  • Washington's Birthday

    Washington's Birthday: Mostly sunny, with a high near 63. Calm wind becoming south southeast around 6 mph in the afternoon.

    High: 63 °F

    Mostly Sunny

Detailed Forecast

This Afternoon
Mostly sunny, with a high near 52. Southeast wind around 5 mph becoming calm.
Tonight
Mostly clear, with a low around 32. Calm wind.
Friday
Sunny, with a high near 58. Calm wind becoming south around 6 mph.
Friday Night
Increasing clouds, with a low around 38. Calm wind.
Saturday
Showers likely, mainly after noon. Cloudy, with a high near 55. Calm wind becoming south southeast around 6 mph in the afternoon. Chance of precipitation is 70%.
Saturday Night
Showers. Low around 46. East southeast wind around 6 mph. Chance of precipitation is 90%.
Sunday
A 50 percent chance of showers, mainly before noon. Mostly cloudy, with a high near 57. Northeast wind 6 to 10 mph.
Sunday Night
Mostly clear, with a low around 39. North northeast wind around 6 mph becoming calm in the evening.
Washington's Birthday
Mostly sunny, with a high near 63. Calm wind becoming south southeast around 6 mph in the afternoon.
Monday Night
Mostly cloudy, with a low around 46. South wind 3 to 6 mph.
Tuesday
Mostly cloudy, with a high near 66. South wind 6 to 14 mph, with gusts as high as 23 mph.
Tuesday Night
Mostly cloudy, with a low around 57. South southwest wind 13 to 15 mph, with gusts as high as 25 mph.
Wednesday
Mostly cloudy, with a high near 70. South southwest wind 13 to 16 mph, with gusts as high as 25 mph.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Marion IL
 37.73°N 88.92°W
Last Update:
12:16 pm CST Feb 12, 2026
Forecast Valid:
12pm CST Feb 12, 2026-6pm CST Feb 18, 2026
 
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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