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

60°F

16°C

Humidity 100%
Wind Speed W 6 mph
Barometer 29.88 in (1011.4 mb)
Dewpoint 60°F (16°C)
Visibility 9.00 mi
Last update 25 Jun 3:51 am CDT
Extended Forecast for

Zion IL

  • Today

    Today: A 20 percent chance of showers after 2pm. Areas of fog before 7am. Otherwise, mostly sunny, with a high near 75. West northwest wind 5 to 10 mph.

    High: 75 °F

    Areas Fog
    then Slight
    Chance
    Showers

  • Tonight

    Tonight: Mostly cloudy, with a low around 54. East northeast wind around 5 mph.

    Low: 54 °F

    Mostly Cloudy

  • Friday

    Friday: Mostly cloudy, with a high near 68. East northeast wind 5 to 10 mph, with gusts as high as 15 mph.

    High: 68 °F

    Mostly Cloudy

  • Friday Night

    Friday Night: Cloudy, then gradually becoming partly cloudy, with a low around 57. Northeast wind 5 to 10 mph.

    Low: 57 °F

    Decreasing
    Clouds

  • Saturday

    Saturday: Mostly sunny, with a high near 72. East northeast wind 5 to 10 mph.

    High: 72 °F

    Mostly Sunny

  • Saturday Night

    Saturday Night: A 20 percent chance of showers and thunderstorms after 1am. Partly cloudy, with a low around 62.

    Low: 62 °F

    Partly Cloudy
    then Slight
    Chance
    T-storms

  • Sunday

    Sunday: A 20 percent chance of showers and thunderstorms before 1pm. Partly sunny, with a high near 78.

    High: 78 °F

    Slight Chance
    T-storms

  • Sunday Night

    Sunday Night: Partly cloudy, with a low around 70.

    Low: 70 °F

    Partly Cloudy

  • Monday

    Monday: Mostly sunny, with a high near 93.

    High: 93 °F

    Mostly Sunny

Detailed Forecast

Today
A 20 percent chance of showers after 2pm. Areas of fog before 7am. Otherwise, mostly sunny, with a high near 75. West northwest wind 5 to 10 mph.
Tonight
Mostly cloudy, with a low around 54. East northeast wind around 5 mph.
Friday
Mostly cloudy, with a high near 68. East northeast wind 5 to 10 mph, with gusts as high as 15 mph.
Friday Night
Cloudy, then gradually becoming partly cloudy, with a low around 57. Northeast wind 5 to 10 mph.
Saturday
Mostly sunny, with a high near 72. East northeast wind 5 to 10 mph.
Saturday Night
A 20 percent chance of showers and thunderstorms after 1am. Partly cloudy, with a low around 62.
Sunday
A 20 percent chance of showers and thunderstorms before 1pm. Partly sunny, with a high near 78.
Sunday Night
Partly cloudy, with a low around 70.
Monday
Mostly sunny, with a high near 93.
Monday Night
Mostly clear, with a low around 74.
Tuesday
Mostly sunny and hot, with a high near 95.
Tuesday Night
Mostly clear, with a low around 73.
Wednesday
Sunny, with a high near 94.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Zion IL
 42.48°N 87.87°W
Last Update:
3:01 am CDT Jun 25, 2026
Forecast Valid:
4am CDT Jun 25, 2026-6pm CDT Jul 1, 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