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

24°F

-4°C

Humidity 81%
Wind Speed Calm
Barometer 30.12 in (1021.2 mb)
Dewpoint 19°F (-7°C)
Visibility 10.00 mi
Last update 14 Mar 2:51 am CDT
Extended Forecast for

Zion IL

  • Overnight

    Overnight: Mostly cloudy, with a low around 29. North northwest wind 5 to 10 mph, with gusts as high as 15 mph.

    Low: 29 °F

    Mostly Cloudy

  • Saturday

    Saturday: A 20 percent chance of snow showers after 2pm. Mostly cloudy, with a high near 36. North northwest wind 5 to 10 mph becoming east southeast in the afternoon. Winds could gust as high as 15 mph.

    High: 36 °F

    Mostly Cloudy
    then Slight
    Chance Snow
    Showers

  • Saturday Night

    Saturday Night: A 30 percent chance of showers, mainly after 1am. Cloudy, with a temperature rising to around 39 by 4am. Breezy, with an east wind 15 to 20 mph, with gusts as high as 30 mph.

    Low: 35 °F⇑

    Chance
    Showers and
    Breezy

  • Sunday

    Sunday: Showers and possibly a thunderstorm. High near 55. Breezy, with a south wind 15 to 20 mph, with gusts as high as 35 mph. Chance of precipitation is 80%.

    High: 55 °F

    Showers and
    Breezy

  • Sunday Night

    Sunday Night: Snow showers, possibly mixed with rain, becoming all snow after 4am. Patchy blowing snow after 1am. Low around 22. Blustery, with a southwest wind 20 to 25 mph becoming north in the evening. Winds could gust as high as 35 mph. Chance of precipitation is 100%.

    Low: 22 °F

    Rain/Snow and
    Patchy
    Blowing Snow

  • Monday

    Monday: Snow showers, mainly before 1pm. Patchy blowing snow. High near 26. Blustery. Chance of precipitation is 80%.

    High: 26 °F

    Snow Showers
    and Patchy
    Blowing Snow

  • Monday Night

    Monday Night: Mostly cloudy, with a low around 10. Blustery.

    Low: 10 °F

    Mostly Cloudy
    and Blustery

  • Tuesday

    Tuesday: Mostly sunny, with a high near 24.

    High: 24 °F

    Mostly Sunny

  • Tuesday Night

    Tuesday Night: A chance of snow after 1am. Mostly cloudy, with a low around 18.

    Low: 18 °F

    Mostly Cloudy
    then Chance
    Snow

Detailed Forecast

Overnight
Mostly cloudy, with a low around 29. North northwest wind 5 to 10 mph, with gusts as high as 15 mph.
Saturday
A 20 percent chance of snow showers after 2pm. Mostly cloudy, with a high near 36. North northwest wind 5 to 10 mph becoming east southeast in the afternoon. Winds could gust as high as 15 mph.
Saturday Night
A 30 percent chance of showers, mainly after 1am. Cloudy, with a temperature rising to around 39 by 4am. Breezy, with an east wind 15 to 20 mph, with gusts as high as 30 mph.
Sunday
Showers and possibly a thunderstorm. High near 55. Breezy, with a south wind 15 to 20 mph, with gusts as high as 35 mph. Chance of precipitation is 80%.
Sunday Night
Snow showers, possibly mixed with rain, becoming all snow after 4am. Patchy blowing snow after 1am. Low around 22. Blustery, with a southwest wind 20 to 25 mph becoming north in the evening. Winds could gust as high as 35 mph. Chance of precipitation is 100%.
Monday
Snow showers, mainly before 1pm. Patchy blowing snow. High near 26. Blustery. Chance of precipitation is 80%.
Monday Night
Mostly cloudy, with a low around 10. Blustery.
Tuesday
Mostly sunny, with a high near 24.
Tuesday Night
A chance of snow after 1am. Mostly cloudy, with a low around 18.
Wednesday
Mostly cloudy, with a high near 41.
Wednesday Night
Partly cloudy, with a low around 33.
Thursday
Mostly sunny, with a high near 49.
Thursday Night
Mostly cloudy, with a low around 36.
Friday
Partly sunny, with a high near 47.
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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:
3:31 am CDT Mar 14, 2026
Forecast Valid:
3am CDT Mar 14, 2026-6pm CDT Mar 20, 2026
 
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