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

67°F

19°C

Humidity 84%
Wind Speed Calm
Barometer 30.00 in (1014.7 mb)
Dewpoint 62°F (17°C)
Visibility 10.00 mi
Last update 31 Jul 2:51 am CDT
Extended Forecast for

Zion IL

  • Overnight

    Overnight: Partly cloudy, with a low around 65. South southwest wind around 5 mph.

    Low: 65 °F

    Partly Cloudy

  • Friday

    Friday: A 40 percent chance of showers, mainly after 3pm. Increasing clouds, with a high near 81. South southwest wind 5 to 15 mph becoming southeast in the afternoon.

    High: 81 °F

    Partly Sunny
    then Chance
    Showers

  • Friday Night

    Friday Night: Showers and possibly a thunderstorm. Low around 66. Breezy, with a south wind 15 to 20 mph becoming east after midnight. Winds could gust as high as 25 mph. Chance of precipitation is 100%. New rainfall amounts between three quarters and one inch possible.

    Low: 66 °F

    Showers and
    Breezy

  • Saturday

    Saturday: Showers and possibly a thunderstorm before 4pm, then a chance of showers. High near 73. Breezy, with an east northeast wind around 20 mph, with gusts as high as 30 mph. Chance of precipitation is 80%.

    High: 73 °F

    Showers and
    Breezy

  • Saturday Night

    Saturday Night: A 30 percent chance of showers, mainly before 7pm. Mostly cloudy, with a low around 62. Breezy, with a north northeast wind 15 to 20 mph, with gusts as high as 30 mph.

    Low: 62 °F

    Chance
    Showers and
    Breezy

  • Sunday

    Sunday: Partly sunny, with a high near 72.

    High: 72 °F

    Partly Sunny

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 59.

    Low: 59 °F

    Mostly Clear

  • Monday

    Monday: Sunny, with a high near 76.

    High: 76 °F

    Sunny

  • Monday Night

    Monday Night: Mostly clear, with a low around 63.

    Low: 63 °F

    Mostly Clear

Detailed Forecast

Overnight
Partly cloudy, with a low around 65. South southwest wind around 5 mph.
Friday
A 40 percent chance of showers, mainly after 3pm. Increasing clouds, with a high near 81. South southwest wind 5 to 15 mph becoming southeast in the afternoon.
Friday Night
Showers and possibly a thunderstorm. Low around 66. Breezy, with a south wind 15 to 20 mph becoming east after midnight. Winds could gust as high as 25 mph. Chance of precipitation is 100%. New rainfall amounts between three quarters and one inch possible.
Saturday
Showers and possibly a thunderstorm before 4pm, then a chance of showers. High near 73. Breezy, with an east northeast wind around 20 mph, with gusts as high as 30 mph. Chance of precipitation is 80%.
Saturday Night
A 30 percent chance of showers, mainly before 7pm. Mostly cloudy, with a low around 62. Breezy, with a north northeast wind 15 to 20 mph, with gusts as high as 30 mph.
Sunday
Partly sunny, with a high near 72.
Sunday Night
Mostly clear, with a low around 59.
Monday
Sunny, with a high near 76.
Monday Night
Mostly clear, with a low around 63.
Tuesday
Sunny, with a high near 79.
Tuesday Night
Mostly clear, with a low around 66.
Wednesday
A chance of showers. Mostly sunny, with a high near 81.
Wednesday Night
Partly cloudy, with a low around 65.
Thursday
A chance of showers. Partly sunny, with a high near 78.
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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 CDT Jul 31, 2026
Forecast Valid:
3am CDT Jul 31, 2026-6pm CDT Aug 6, 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