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

23°F

-5°C

Humidity 81%
Wind Speed SW 14 mph
Barometer 29.84 in (1012.1 mb)
Dewpoint 18°F (-8°C)
Visibility 10.00 mi
Wind Chill11°F (-12°C)
Last update 9 Dec 3:51 am CST
Extended Forecast for

Zion IL

  • Overnight

    Overnight: A 20 percent chance of snow before 5am. Cloudy, with a steady temperature around 23. South southwest wind around 15 mph, with gusts as high as 30 mph.

    Low: 23 °F

    Slight Chance
    Snow

  • Tuesday

    Tuesday: A 20 percent chance of rain after 5pm. Cloudy, with a high near 34. West southwest wind 10 to 15 mph, with gusts as high as 30 mph.

    High: 34 °F

    Cloudy then
    Slight Chance
    Rain

  • Tuesday Night

    Tuesday Night: Rain, snow and freezing rain, possibly mixed with sleet before 1am, then a chance of rain between 1am and 5am, then rain and snow likely after 5am. Low around 31. Breezy, with a south southwest wind 15 to 25 mph becoming west after midnight. Winds could gust as high as 40 mph. Chance of precipitation is 100%. Little or no ice accumulation expected. Little or no snow and sleet accumulation expected.

    Low: 31 °F

    Breezy.
    Wintry Mix
    then
    Rain/Snow
    Likely

  • Wednesday

    Wednesday: Rain and snow showers, becoming all snow after 7am. High near 34. Breezy, with a northwest wind 15 to 25 mph, with gusts as high as 40 mph. Chance of precipitation is 80%. New snow accumulation of less than one inch possible.

    High: 34 °F

    Breezy.
    Rain/Snow
    then Slight
    Chance Snow
    Showers

  • Wednesday Night

    Wednesday Night: A 20 percent chance of snow before midnight. Mostly cloudy, with a low around 14. Northwest wind 5 to 10 mph, with gusts as high as 20 mph.

    Low: 14 °F

    Slight Chance
    Snow then
    Mostly Cloudy

  • Thursday

    Thursday: A 20 percent chance of snow after noon. Partly sunny, with a high near 23.

    High: 23 °F

    Mostly Sunny
    then Slight
    Chance Snow

  • Thursday Night

    Thursday Night: A 40 percent chance of snow. Mostly cloudy, with a low around 14.

    Low: 14 °F

    Chance Snow

  • Friday

    Friday: A chance of snow. Mostly cloudy, with a high near 27.

    High: 27 °F

    Chance Snow

  • Friday Night

    Friday Night: A chance of snow before midnight. Mostly cloudy, with a low around 4.

    Low: 4 °F

    Chance Snow
    then Mostly
    Cloudy

Detailed Forecast

Overnight
A 20 percent chance of snow before 5am. Cloudy, with a steady temperature around 23. South southwest wind around 15 mph, with gusts as high as 30 mph.
Tuesday
A 20 percent chance of rain after 5pm. Cloudy, with a high near 34. West southwest wind 10 to 15 mph, with gusts as high as 30 mph.
Tuesday Night
Rain, snow and freezing rain, possibly mixed with sleet before 1am, then a chance of rain between 1am and 5am, then rain and snow likely after 5am. Low around 31. Breezy, with a south southwest wind 15 to 25 mph becoming west after midnight. Winds could gust as high as 40 mph. Chance of precipitation is 100%. Little or no ice accumulation expected. Little or no snow and sleet accumulation expected.
Wednesday
Rain and snow showers, becoming all snow after 7am. High near 34. Breezy, with a northwest wind 15 to 25 mph, with gusts as high as 40 mph. Chance of precipitation is 80%. New snow accumulation of less than one inch possible.
Wednesday Night
A 20 percent chance of snow before midnight. Mostly cloudy, with a low around 14. Northwest wind 5 to 10 mph, with gusts as high as 20 mph.
Thursday
A 20 percent chance of snow after noon. Partly sunny, with a high near 23.
Thursday Night
A 40 percent chance of snow. Mostly cloudy, with a low around 14.
Friday
A chance of snow. Mostly cloudy, with a high near 27.
Friday Night
A chance of snow before midnight. Mostly cloudy, with a low around 4.
Saturday
A chance of snow. 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 13.
Sunday Night
Mostly cloudy, with a low around 4.
Monday
A chance of snow. Mostly cloudy, with a high near 22.
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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:
2:51 am CST Dec 9, 2025
Forecast Valid:
4am CST Dec 9, 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