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.

Fair

35°F

2°C

Humidity 61%
Wind Speed W 12 mph
Barometer 30.09 in (1020.1 mb)
Dewpoint 23°F (-5°C)
Visibility 10.00 mi
Wind Chill27°F (-3°C)
Last update 12 Jan 10:51 am CST
Extended Forecast for

Zion IL

  • Today

    Today: Sunny, with a high near 43. West southwest wind 10 to 15 mph, with gusts as high as 20 mph.

    High: 43 °F

    Sunny

  • Tonight

    Tonight: Increasing clouds, with a low around 35. Southwest wind 10 to 15 mph, with gusts as high as 25 mph.

    Low: 35 °F

    Increasing
    Clouds

  • Tuesday

    Tuesday: A slight chance of sprinkles before 7am, then a slight chance of sprinkles and flurries between 7am and 8am, then a slight chance of sprinkles after 8am. Cloudy, then gradually becoming mostly sunny, with a high near 48. Breezy, with a west southwest wind 15 to 20 mph, with gusts as high as 30 mph.

    High: 48 °F

    Slight Chance
    Sprinkles/Flurries
    and Breezy

  • Tuesday Night

    Tuesday Night: Mostly cloudy, with a low around 31. West wind around 15 mph, with gusts as high as 25 mph.

    Low: 31 °F

    Mostly Cloudy

  • Wednesday

    Wednesday: Snow showers likely, mainly before noon. Mostly cloudy, with a high near 33. Breezy, with a north wind 20 to 25 mph, with gusts as high as 40 mph. Chance of precipitation is 70%.

    High: 33 °F

    Snow Showers
    Likely and
    Breezy

  • Wednesday Night

    Wednesday Night: A 30 percent chance of snow showers. Mostly cloudy, with a low around 16. Blustery.

    Low: 16 °F

    Chance Snow
    Showers and
    Blustery

  • Thursday

    Thursday: A 20 percent chance of snow showers before noon. Partly sunny, with a high near 26.

    High: 26 °F

    Slight Chance
    Snow Showers
    then Mostly
    Sunny

  • Thursday Night

    Thursday Night: A chance of snow. Mostly cloudy, with a low around 21.

    Low: 21 °F

    Chance Snow

  • Friday

    Friday: Scattered snow showers. Mostly cloudy, with a high near 32.

    High: 32 °F

    Scattered
    Snow Showers

Detailed Forecast

Today
Sunny, with a high near 43. West southwest wind 10 to 15 mph, with gusts as high as 20 mph.
Tonight
Increasing clouds, with a low around 35. Southwest wind 10 to 15 mph, with gusts as high as 25 mph.
Tuesday
A slight chance of sprinkles before 7am, then a slight chance of sprinkles and flurries between 7am and 8am, then a slight chance of sprinkles after 8am. Cloudy, then gradually becoming mostly sunny, with a high near 48. Breezy, with a west southwest wind 15 to 20 mph, with gusts as high as 30 mph.
Tuesday Night
Mostly cloudy, with a low around 31. West wind around 15 mph, with gusts as high as 25 mph.
Wednesday
Snow showers likely, mainly before noon. Mostly cloudy, with a high near 33. Breezy, with a north wind 20 to 25 mph, with gusts as high as 40 mph. Chance of precipitation is 70%.
Wednesday Night
A 30 percent chance of snow showers. Mostly cloudy, with a low around 16. Blustery.
Thursday
A 20 percent chance of snow showers before noon. Partly sunny, with a high near 26.
Thursday Night
A chance of snow. Mostly cloudy, with a low around 21.
Friday
Scattered snow showers. Mostly cloudy, with a high near 32.
Friday Night
Scattered snow showers. Mostly cloudy, with a low around 20.
Saturday
A chance of snow showers. Mostly cloudy, with a high near 22.
Saturday Night
Mostly cloudy, with a low around 8.
Sunday
Partly sunny, with a high near 18.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Zion IL
 42.45°N 87.81°W
Last Update:
11:06 am CST Jan 12, 2026
Forecast Valid:
11am CST Jan 12, 2026-6pm CST Jan 18, 2026
 
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Additional Resources

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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