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

39°F

4°C

Humidity 96%
Wind Speed Calm
Barometer 29.98 in
Dewpoint 38°F (3°C)
Visibility 10.00 mi
Last update 27 Feb 1:35 am CST
Extended Forecast for

Marion IL

  • Overnight

    Overnight: Clear, with a low around 37. Calm wind.

    Low: 37 °F

    Clear

  • Friday

    Friday: Patchy fog before 7am. Otherwise, sunny, with a high near 70. Light south wind becoming southwest 5 to 10 mph in the morning.

    High: 70 °F

    Patchy Fog
    then Sunny

  • Friday Night

    Friday Night: Mostly clear, with a low around 43. South wind 5 to 7 mph becoming light and variable after midnight.

    Low: 43 °F

    Mostly Clear

  • Saturday

    Saturday: Sunny, with a high near 68. Light and variable wind becoming southeast 5 to 7 mph in the morning.

    High: 68 °F

    Sunny

  • Saturday Night

    Saturday Night: A 20 percent chance of showers before midnight. Partly cloudy, with a low around 35. South wind 6 to 10 mph becoming north after midnight. Winds could gust as high as 18 mph.

    Low: 35 °F

    Slight Chance
    Showers then
    Partly Cloudy

  • Sunday

    Sunday: Mostly cloudy, with a high near 51. East northeast wind 9 to 11 mph, with gusts as high as 18 mph.

    High: 51 °F

    Mostly Cloudy

  • Sunday Night

    Sunday Night: Showers likely, mainly after midnight. Cloudy, with a low around 36. East northeast wind around 9 mph. Chance of precipitation is 70%.

    Low: 36 °F

    Showers
    Likely

  • Monday

    Monday: A chance of showers, mainly before noon. Cloudy, with a high near 46. East northeast wind 7 to 9 mph.

    High: 46 °F

    Chance
    Showers

  • Monday Night

    Monday Night: A chance of showers. Mostly cloudy, with a low around 39. East wind 5 to 7 mph becoming south southeast after midnight.

    Low: 39 °F

    Chance
    Showers

Detailed Forecast

Overnight
Clear, with a low around 37. Calm wind.
Friday
Patchy fog before 7am. Otherwise, sunny, with a high near 70. Light south wind becoming southwest 5 to 10 mph in the morning.
Friday Night
Mostly clear, with a low around 43. South wind 5 to 7 mph becoming light and variable after midnight.
Saturday
Sunny, with a high near 68. Light and variable wind becoming southeast 5 to 7 mph in the morning.
Saturday Night
A 20 percent chance of showers before midnight. Partly cloudy, with a low around 35. South wind 6 to 10 mph becoming north after midnight. Winds could gust as high as 18 mph.
Sunday
Mostly cloudy, with a high near 51. East northeast wind 9 to 11 mph, with gusts as high as 18 mph.
Sunday Night
Showers likely, mainly after midnight. Cloudy, with a low around 36. East northeast wind around 9 mph. Chance of precipitation is 70%.
Monday
A chance of showers, mainly before noon. Cloudy, with a high near 46. East northeast wind 7 to 9 mph.
Monday Night
A chance of showers. Mostly cloudy, with a low around 39. East wind 5 to 7 mph becoming south southeast after midnight.
Tuesday
Showers likely, with thunderstorms also possible after noon. Cloudy, with a high near 59. South southeast wind 7 to 9 mph becoming southwest in the afternoon.
Tuesday Night
Showers likely and possibly a thunderstorm. Cloudy, with a low around 48. Southwest wind around 7 mph becoming east in the evening.
Wednesday
A chance of showers and thunderstorms. Cloudy, with a high near 67. South wind 7 to 10 mph.
Wednesday Night
A chance of showers and thunderstorms. Mostly cloudy, with a low around 56. South wind 8 to 11 mph, with gusts as high as 21 mph.
Thursday
Showers likely. Mostly cloudy, with a high near 70. South southwest wind 10 to 14 mph, with gusts as high as 22 mph.
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ABOUT THIS FORECAST

 
Point Forecast:
Marion IL
 37.73°N 88.95°W
Last Update:
12:17 am CST Feb 27, 2026
Forecast Valid:
1am CST Feb 27, 2026-6pm CST Mar 5, 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