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

54°F

12°C

Humidity 67%
Wind Speed N 9 mph
Barometer 29.96 in
Dewpoint 43°F (6°C)
Visibility 10.00 mi
Wind Chill51°F (11°C)
Last update 15 Feb 4:47 pm CST
Extended Forecast for

Marion IL

  • Tonight

    Tonight: Widespread fog, mainly after 5am. Otherwise, partly cloudy, with a low around 37. North wind around 6 mph becoming calm in the evening.

    Low: 37 °F

    Mostly Clear
    then Fog

  • Washington's Birthday

    Washington's Birthday: Widespread fog, mainly before 8am. Otherwise, mostly sunny, with a high near 62. Calm wind becoming south 5 to 9 mph in the morning.

    High: 62 °F

    Fog then
    Mostly Sunny

  • Monday Night

    Monday Night: Mostly cloudy, with a low around 42. South wind 3 to 5 mph.

    Low: 42 °F

    Mostly Cloudy

  • Tuesday

    Tuesday: Mostly cloudy, with a high near 65. South wind 6 to 11 mph increasing to 12 to 17 mph in the afternoon. Winds could gust as high as 26 mph.

    High: 65 °F

    Mostly Cloudy

  • Tuesday Night

    Tuesday Night: Mostly cloudy, with a low around 58. Breezy, with a south southwest wind 17 to 20 mph, with gusts as high as 33 mph.

    Low: 58 °F

    Mostly Cloudy
    and Breezy

  • Wednesday

    Wednesday: Mostly sunny, with a high near 73. Southwest wind 10 to 18 mph, with gusts as high as 30 mph.

    High: 73 °F

    Mostly Sunny

  • Wednesday Night

    Wednesday Night: Mostly clear, with a low around 53. South southwest wind 5 to 9 mph.

    Low: 53 °F

    Mostly Clear

  • Thursday

    Thursday: A slight chance of showers and thunderstorms after noon. Mostly sunny, with a high near 74. South wind 5 to 14 mph, with gusts as high as 24 mph.

    High: 74 °F

    Mostly Sunny
    then Slight
    Chance
    T-storms

  • Thursday Night

    Thursday Night: A chance of showers and thunderstorms before midnight, then a slight chance of showers. Partly cloudy, with a low around 45. West wind 7 to 10 mph, with gusts as high as 18 mph.

    Low: 45 °F

    Chance
    T-storms then
    Slight Chance
    Showers

Detailed Forecast

Tonight
Widespread fog, mainly after 5am. Otherwise, partly cloudy, with a low around 37. North wind around 6 mph becoming calm in the evening.
Washington's Birthday
Widespread fog, mainly before 8am. Otherwise, mostly sunny, with a high near 62. Calm wind becoming south 5 to 9 mph in the morning.
Monday Night
Mostly cloudy, with a low around 42. South wind 3 to 5 mph.
Tuesday
Mostly cloudy, with a high near 65. South wind 6 to 11 mph increasing to 12 to 17 mph in the afternoon. Winds could gust as high as 26 mph.
Tuesday Night
Mostly cloudy, with a low around 58. Breezy, with a south southwest wind 17 to 20 mph, with gusts as high as 33 mph.
Wednesday
Mostly sunny, with a high near 73. Southwest wind 10 to 18 mph, with gusts as high as 30 mph.
Wednesday Night
Mostly clear, with a low around 53. South southwest wind 5 to 9 mph.
Thursday
A slight chance of showers and thunderstorms after noon. Mostly sunny, with a high near 74. South wind 5 to 14 mph, with gusts as high as 24 mph.
Thursday Night
A chance of showers and thunderstorms before midnight, then a slight chance of showers. Partly cloudy, with a low around 45. West wind 7 to 10 mph, with gusts as high as 18 mph.
Friday
A chance of showers, mainly after noon. Partly sunny, with a high near 57. West northwest wind 7 to 9 mph.
Friday Night
A chance of showers. Mostly cloudy, with a low around 36. North wind around 6 mph.
Saturday
A chance of showers. Mostly sunny, with a high near 51. North northwest wind 5 to 9 mph.
Saturday Night
A chance of showers. Partly cloudy, with a low around 30. North northwest wind 5 to 7 mph.
Sunday
Mostly sunny, with a high near 48. North northwest wind 7 to 10 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:
3:57 pm CST Feb 15, 2026
Forecast Valid:
5pm CST Feb 15, 2026-6pm CST Feb 22, 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