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

21°F

-6°C

Humidity 78%
Wind Speed S 7 mph
Barometer 30.13 in (1022.1 mb)
Dewpoint 15°F (-9°C)
Visibility 10.00 mi
Wind Chill12°F (-11°C)
Last update 24 Feb 2:51 am CST
Extended Forecast for

Zion IL

  • Overnight

    Overnight: Mostly cloudy, with a steady temperature around 21. South southwest wind 5 to 10 mph, with gusts as high as 15 mph.

    Low: 21 °F

    Mostly Cloudy

  • Tuesday

    Tuesday: A chance of rain and snow showers after 3pm. Mostly cloudy, with a high near 40. Breezy, with a south southwest wind 10 to 15 mph increasing to 20 to 25 mph in the morning. Winds could gust as high as 40 mph. Chance of precipitation is 40%.

    High: 40 °F

    Breezy.
    Partly Sunny
    then Chance
    Rain/Snow

  • Tuesday Night

    Tuesday Night: A 30 percent chance of light rain with a slight chance of showers before 7pm. Mostly cloudy, with a low around 22. West northwest wind around 15 mph, with gusts as high as 30 mph.

    Low: 22 °F

    Chance Light
    Rain then
    Partly Cloudy

  • Wednesday

    Wednesday: Sunny, with a high near 31. West northwest wind 10 to 15 mph, with gusts as high as 30 mph.

    High: 31 °F

    Sunny

  • Wednesday Night

    Wednesday Night: A 20 percent chance of snow after midnight. Mostly cloudy, with a low around 22. West northwest wind 5 to 10 mph becoming north northeast after midnight.

    Low: 22 °F

    Mostly Cloudy
    then Slight
    Chance Snow

  • Thursday

    Thursday: Mostly sunny, with a high near 38.

    High: 38 °F

    Mostly Sunny

  • Thursday Night

    Thursday Night: Mostly clear, with a low around 29.

    Low: 29 °F

    Mostly Clear

  • Friday

    Friday: Sunny, with a high near 52.

    High: 52 °F

    Sunny

  • Friday Night

    Friday Night: Partly cloudy, with a low around 31.

    Low: 31 °F

    Partly Cloudy

Detailed Forecast

Overnight
Mostly cloudy, with a steady temperature around 21. South southwest wind 5 to 10 mph, with gusts as high as 15 mph.
Tuesday
A chance of rain and snow showers after 3pm. Mostly cloudy, with a high near 40. Breezy, with a south southwest wind 10 to 15 mph increasing to 20 to 25 mph in the morning. Winds could gust as high as 40 mph. Chance of precipitation is 40%.
Tuesday Night
A 30 percent chance of light rain with a slight chance of showers before 7pm. Mostly cloudy, with a low around 22. West northwest wind around 15 mph, with gusts as high as 30 mph.
Wednesday
Sunny, with a high near 31. West northwest wind 10 to 15 mph, with gusts as high as 30 mph.
Wednesday Night
A 20 percent chance of snow after midnight. Mostly cloudy, with a low around 22. West northwest wind 5 to 10 mph becoming north northeast after midnight.
Thursday
Mostly sunny, with a high near 38.
Thursday Night
Mostly clear, with a low around 29.
Friday
Sunny, with a high near 52.
Friday Night
Partly cloudy, with a low around 31.
Saturday
A chance of snow after noon. Partly sunny, with a high near 38.
Saturday Night
Mostly cloudy, with a low around 20.
Sunday
Mostly sunny, with a high near 30.
Sunday Night
A chance of snow. Partly cloudy, with a low around 22.
Monday
A chance of snow. Partly sunny, with a high near 33.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Zion IL
 42.45°N 87.81°W
Last Update:
2:01 am CST Feb 24, 2026
Forecast Valid:
3am CST Feb 24, 2026-6pm CST Mar 2, 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