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

Chicago/Waukegan Regional Airport (KUGN)

Lat: 42.43°NLon: 87.86°WElev: 709ft.

Overcast

25°F

-4°C

Humidity 55%
Wind Speed S 10 mph
Barometer 30.26 in (1026.6 mb)
Dewpoint 11°F (-12°C)
Visibility 10.00 mi
Wind Chill15°F (-9°C)
Last update 8 Dec 2:51 pm CST
Extended Forecast for

Zion IL

  • Tonight

    Tonight: A 30 percent chance of snow, mainly between 11pm and 4am. Mostly cloudy, with a temperature rising to around 24 by 5am. South wind 10 to 15 mph, with gusts as high as 30 mph.

    Low: 20 °F⇑

    Chance Snow

  • Tuesday

    Tuesday: A chance of rain or freezing rain after 5pm. Cloudy, with a high near 34. Breezy, with a west southwest wind 15 to 20 mph, with gusts as high as 25 mph. Chance of precipitation is 30%.

    High: 34 °F

    Cloudy and
    Breezy then
    Chance
    Rain/Freezing
    Rain

  • Tuesday Night

    Tuesday Night: Rain, snow, and freezing rain, becoming all rain after 11pm. Low around 31. Breezy, with a south southwest wind 15 to 20 mph becoming west 20 to 25 mph after midnight. Winds could gust as high as 40 mph. Chance of precipitation is 100%. Little or no ice accumulation expected. New snow accumulation of less than a half inch possible.

    Low: 31 °F

    Breezy.
    Wintry Mix
    then Rain
    Likely

  • Wednesday

    Wednesday: Rain and snow likely, becoming all snow after 9am. Cloudy, with a high near 35. Breezy, with a northwest wind 15 to 25 mph, with gusts as high as 35 mph. Chance of precipitation is 70%. New snow accumulation of less than a half inch possible.

    High: 35 °F

    Breezy.
    Rain/Snow
    Likely then
    Chance Snow

  • Wednesday Night

    Wednesday Night: A 30 percent chance of snow before midnight. Mostly cloudy, with a low around 15. West northwest wind 5 to 15 mph, with gusts as high as 20 mph.

    Low: 15 °F

    Chance Snow
    then Partly
    Cloudy

  • Thursday

    Thursday: A 20 percent chance of snow. Partly sunny, with a high near 24.

    High: 24 °F

    Slight Chance
    Snow

  • Thursday Night

    Thursday Night: A 40 percent chance of snow. Mostly cloudy, with a low around 11.

    Low: 11 °F

    Chance Snow

  • Friday

    Friday: A chance of snow. Mostly cloudy, with a high near 23.

    High: 23 °F

    Chance Snow

  • Friday Night

    Friday Night: A chance of snow before midnight. Mostly cloudy, with a low around 3.

    Low: 3 °F

    Chance Snow
    then Mostly
    Cloudy

Detailed Forecast

Tonight
A 30 percent chance of snow, mainly between 11pm and 4am. Mostly cloudy, with a temperature rising to around 24 by 5am. South wind 10 to 15 mph, with gusts as high as 30 mph.
Tuesday
A chance of rain or freezing rain after 5pm. Cloudy, with a high near 34. Breezy, with a west southwest wind 15 to 20 mph, with gusts as high as 25 mph. Chance of precipitation is 30%.
Tuesday Night
Rain, snow, and freezing rain, becoming all rain after 11pm. Low around 31. Breezy, with a south southwest wind 15 to 20 mph becoming west 20 to 25 mph after midnight. Winds could gust as high as 40 mph. Chance of precipitation is 100%. Little or no ice accumulation expected. New snow accumulation of less than a half inch possible.
Wednesday
Rain and snow likely, becoming all snow after 9am. Cloudy, with a high near 35. Breezy, with a northwest wind 15 to 25 mph, with gusts as high as 35 mph. Chance of precipitation is 70%. New snow accumulation of less than a half inch possible.
Wednesday Night
A 30 percent chance of snow before midnight. Mostly cloudy, with a low around 15. West northwest wind 5 to 15 mph, with gusts as high as 20 mph.
Thursday
A 20 percent chance of snow. Partly sunny, with a high near 24.
Thursday Night
A 40 percent chance of snow. Mostly cloudy, with a low around 11.
Friday
A chance of snow. Mostly cloudy, with a high near 23.
Friday Night
A chance of snow before midnight. Mostly cloudy, with a low around 3.
Saturday
Mostly cloudy and cold, with a high near 10.
Saturday Night
A chance of snow. Mostly cloudy, with a low around 1.
Sunday
Mostly sunny, with a high near 18.
Sunday Night
Mostly cloudy, with a low around 9.
Monday
A chance of snow. Mostly cloudy, with a high near 26.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Zion IL
 42.45°N 87.84°W
Last Update:
3:11 pm CST Dec 8, 2025
Forecast Valid:
4pm CST Dec 8, 2025-6pm CST Dec 15, 2025
 
Forecast Discussion
 
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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