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.

Overcast

76°F

24°C

Humidity 88%
Wind Speed SE 10 mph
Barometer 30.06 in (1016.7 mb)
Dewpoint 72°F (22°C)
Visibility 10.00 mi
Heat Index76°F (24°C)
Last update 15 Aug 11:51 am CDT
Extended Forecast for

Zion IL

  • This Afternoon

    This Afternoon: A 30 percent chance of showers, mainly before 2pm. Mostly cloudy, with a high near 76. Southeast wind around 10 mph, with gusts as high as 15 mph.

    High: 76 °F

    Chance
    Showers

  • Tonight

    Tonight: A slight chance of showers, then a chance of showers and thunderstorms after 2am. Mostly cloudy, with a low around 71. Southeast wind around 5 mph becoming west southwest after midnight. Chance of precipitation is 40%.

    Low: 71 °F

    Slight Chance
    Showers then
    Chance
    T-storms

  • Sunday

    Sunday: A chance of showers and thunderstorms before 8am, then a slight chance of showers between 8am and 9am. Partly sunny, with a high near 83. Northwest wind around 10 mph, with gusts as high as 15 mph. Chance of precipitation is 30%.

    High: 83 °F

    Chance
    Showers then
    Mostly Sunny

  • Sunday Night

    Sunday Night: Partly cloudy, with a low around 65. North northwest wind around 10 mph.

    Low: 65 °F

    Partly Cloudy

  • Monday

    Monday: Sunny, with a high near 76. North wind around 5 mph becoming southeast in the afternoon.

    High: 76 °F

    Sunny

  • Monday Night

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

    Low: 63 °F

    Mostly Clear

  • Tuesday

    Tuesday: Partly sunny, with a high near 81.

    High: 81 °F

    Partly Sunny

  • Tuesday Night

    Tuesday Night: A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 1am. Mostly cloudy, with a low around 65.

    Low: 65 °F

    Chance
    T-storms then
    Showers
    Likely

  • Wednesday

    Wednesday: A chance of showers and thunderstorms before 1pm. Partly sunny, with a high near 75.

    High: 75 °F

    Chance
    T-storms

Detailed Forecast

This Afternoon
A 30 percent chance of showers, mainly before 2pm. Mostly cloudy, with a high near 76. Southeast wind around 10 mph, with gusts as high as 15 mph.
Tonight
A slight chance of showers, then a chance of showers and thunderstorms after 2am. Mostly cloudy, with a low around 71. Southeast wind around 5 mph becoming west southwest after midnight. Chance of precipitation is 40%.
Sunday
A chance of showers and thunderstorms before 8am, then a slight chance of showers between 8am and 9am. Partly sunny, with a high near 83. Northwest wind around 10 mph, with gusts as high as 15 mph. Chance of precipitation is 30%.
Sunday Night
Partly cloudy, with a low around 65. North northwest wind around 10 mph.
Monday
Sunny, with a high near 76. North wind around 5 mph becoming southeast in the afternoon.
Monday Night
Mostly clear, with a low around 63.
Tuesday
Partly sunny, with a high near 81.
Tuesday Night
A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 1am. Mostly cloudy, with a low around 65.
Wednesday
A chance of showers and thunderstorms before 1pm. Partly sunny, with a high near 75.
Wednesday Night
Mostly cloudy, with a low around 59.
Thursday
Mostly sunny, with a high near 70.
Thursday Night
Partly cloudy, with a low around 58.
Friday
Mostly sunny, with a high near 72.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Zion IL
 42.45°N 87.84°W
Last Update:
8:46 am CDT Aug 15, 2026
Forecast Valid:
12pm CDT Aug 15, 2026-6pm CDT Aug 21, 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