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.

Mostly Cloudy

86°F

30°C

Humidity 75%
Wind Speed S 14 mph
Barometer 29.91 in (1011.2 mb)
Dewpoint 77°F (25°C)
Visibility 10.00 mi
Heat Index97°F (36°C)
Last update 29 Jun 10:51 am CDT
Extended Forecast for

Zion IL

Heat Advisory June 29, 12:00pm until July 1, 10:00pm
Click here for hazard details and duration
Heat Advisory

  • Today

    Today: Sunny, with a high near 91. Heat index values as high as 99. South wind around 15 mph, with gusts as high as 25 mph.

    High: 91 °F

    Sunny

  • Tonight

    Tonight: Mostly clear, with a low around 75. South southwest wind 10 to 15 mph, with gusts as high as 25 mph.

    Low: 75 °F

    Mostly Clear

  • Tuesday

    Tuesday: Mostly sunny, with a high near 94. Heat index values as high as 107. Southwest wind around 15 mph, with gusts as high as 25 mph.

    High: 94 °F

    Mostly Sunny

  • Tuesday Night

    Tuesday Night: Mostly clear, with a low around 75. Southwest wind around 15 mph, with gusts as high as 25 mph.

    Low: 75 °F

    Mostly Clear

  • Wednesday

    Wednesday: Sunny and hot, with a high near 95. Southwest wind 10 to 15 mph, with gusts as high as 25 mph.

    High: 95 °F

    Hot

  • Wednesday Night

    Wednesday Night: Mostly clear, with a low around 74.

    Low: 74 °F

    Mostly Clear

  • Thursday

    Thursday: A 20 percent chance of showers and thunderstorms after 1pm. Sunny, with a high near 93.

    High: 93 °F

    Sunny then
    Slight Chance
    T-storms

  • Thursday Night

    Thursday Night: A chance of showers and thunderstorms. Partly cloudy, with a low around 72.

    Low: 72 °F

    Chance
    T-storms

  • Friday

    Friday: A chance of showers, with thunderstorms also possible after 1pm. Mostly sunny, with a high near 87.

    High: 87 °F

    Chance
    Showers then
    Chance
    T-storms

Detailed Forecast

Today
Sunny, with a high near 91. Heat index values as high as 99. South wind around 15 mph, with gusts as high as 25 mph.
Tonight
Mostly clear, with a low around 75. South southwest wind 10 to 15 mph, with gusts as high as 25 mph.
Tuesday
Mostly sunny, with a high near 94. Heat index values as high as 107. Southwest wind around 15 mph, with gusts as high as 25 mph.
Tuesday Night
Mostly clear, with a low around 75. Southwest wind around 15 mph, with gusts as high as 25 mph.
Wednesday
Sunny and hot, with a high near 95. Southwest wind 10 to 15 mph, with gusts as high as 25 mph.
Wednesday Night
Mostly clear, with a low around 74.
Thursday
A 20 percent chance of showers and thunderstorms after 1pm. Sunny, with a high near 93.
Thursday Night
A chance of showers and thunderstorms. Partly cloudy, with a low around 72.
Friday
A chance of showers, with thunderstorms also possible after 1pm. Mostly sunny, with a high near 87.
Friday Night
A chance of showers and thunderstorms. Partly cloudy, with a low around 69.
Independence Day
Mostly sunny, with a high near 83.
Saturday Night
A chance of showers and thunderstorms. Partly cloudy, with a low around 68.
Sunday
A chance of showers and thunderstorms. Partly sunny, with a high near 82.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Zion IL
 42.45°N 87.84°W
Last Update:
10:16 am CDT Jun 29, 2026
Forecast Valid:
11am CDT Jun 29, 2026-6pm CDT Jul 5, 2026
 
Forecast Discussion
 
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Additional Resources

Radar & Satellite Image

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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