National Oceanic and Atmospheric Administration National Weather Service United States Department of Commerce

Hazardous Weather Conditions

Current conditions at

Chicago/Waukegan Regional Airport (KUGN)

Lat: 42.43°NLon: 87.86°WElev: 709ft.

Fair

85°F

29°C

Humidity 63%
Wind Speed SW 5 mph
Barometer 29.94 in (1012.4 mb)
Dewpoint 71°F (22°C)
Visibility 10.00 mi
Heat Index90°F (32°C)
Last update 2 Sep 10:51 am CDT
Extended Forecast for

Zion IL

Heat Advisory September 2, 12:00pm until September 2, 09:00pm
Click here for hazard details and duration
Heat Advisory

  • Today

    Today: Mostly sunny, with a high near 89. Heat index values as high as 97. Southwest wind 10 to 15 mph, with gusts as high as 25 mph.

    High: 89 °F

    Mostly Sunny

  • Tonight

    Tonight: A 30 percent chance of showers and thunderstorms, mainly after 1am. Partly cloudy, with a low around 72. South southwest wind 5 to 10 mph, with gusts as high as 15 mph.

    Low: 72 °F

    Chance
    T-storms

  • Thursday

    Thursday: A 40 percent chance of showers and thunderstorms. Partly sunny, with a high near 86. Southwest wind around 5 mph becoming northeast in the afternoon.

    High: 86 °F

    Chance
    T-storms

  • Thursday Night

    Thursday Night: Showers and thunderstorms likely, mainly after 1am. Mostly cloudy, with a low around 71. East wind around 5 mph. Chance of precipitation is 60%.

    Low: 71 °F

    Slight Chance
    T-storms then
    T-storms
    Likely

  • Friday

    Friday: A 50 percent chance of showers and thunderstorms before 1pm. Partly sunny, with a high near 79. East southeast wind around 5 mph.

    High: 79 °F

    Chance
    T-storms

  • Friday Night

    Friday Night: A 50 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 70.

    Low: 70 °F

    Chance
    T-storms

  • Saturday

    Saturday: A 30 percent chance of showers and thunderstorms, mainly before 1pm. Partly sunny, with a high near 79.

    High: 79 °F

    Chance
    T-storms

  • Saturday Night

    Saturday Night: A chance of showers before 1am. Partly cloudy, with a low around 68.

    Low: 68 °F

    Chance
    Showers

  • Sunday

    Sunday: Partly sunny, with a high near 79.

    High: 79 °F

    Partly Sunny

Detailed Forecast

Today
Mostly sunny, with a high near 89. Heat index values as high as 97. Southwest wind 10 to 15 mph, with gusts as high as 25 mph.
Tonight
A 30 percent chance of showers and thunderstorms, mainly after 1am. Partly cloudy, with a low around 72. South southwest wind 5 to 10 mph, with gusts as high as 15 mph.
Thursday
A 40 percent chance of showers and thunderstorms. Partly sunny, with a high near 86. Southwest wind around 5 mph becoming northeast in the afternoon.
Thursday Night
Showers and thunderstorms likely, mainly after 1am. Mostly cloudy, with a low around 71. East wind around 5 mph. Chance of precipitation is 60%.
Friday
A 50 percent chance of showers and thunderstorms before 1pm. Partly sunny, with a high near 79. East southeast wind around 5 mph.
Friday Night
A 50 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 70.
Saturday
A 30 percent chance of showers and thunderstorms, mainly before 1pm. Partly sunny, with a high near 79.
Saturday Night
A chance of showers before 1am. Partly cloudy, with a low around 68.
Sunday
Partly sunny, with a high near 79.
Sunday Night
A chance of showers after 1am. Mostly cloudy, with a low around 66.
Labor Day
Partly sunny, with a high near 78.
Monday Night
Mostly cloudy, with a low around 64.
Tuesday
Partly sunny, with a high near 79.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Zion IL
 42.45°N 87.84°W
Last Update:
9:56 am CDT Sep 2, 2026
Forecast Valid:
11am CDT Sep 2, 2026-6pm CDT Sep 8, 2026
 
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Additional Resources

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Hourly Weather Forecast

National Digital Forecast Database

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High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation