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

45°F

7°C

Humidity 68%
Wind Speed S 6 mph
Barometer 30.13 in (1020.7 mb)
Dewpoint 35°F (2°C)
Visibility 10.00 mi
Wind Chill42°F (6°C)
Last update 20 Apr 8:51 pm CDT
Extended Forecast for

Zion IL

  • Tonight

    Tonight: Mostly cloudy, with a temperature rising to around 45 by 4am. South wind 10 to 15 mph, with gusts as high as 25 mph.

    Low: 41 °F⇑

    Mostly Cloudy

  • Tuesday

    Tuesday: A 20 percent chance of showers and thunderstorms after 2pm. Mostly sunny, with a high near 73. Southwest wind 10 to 15 mph, with gusts as high as 25 mph.

    High: 73 °F

    Mostly Sunny
    then Slight
    Chance
    T-storms

  • Tuesday Night

    Tuesday Night: Partly cloudy, with a low around 44. West wind around 5 mph becoming north after midnight. Winds could gust as high as 10 mph.

    Low: 44 °F

    Partly Cloudy

  • Wednesday

    Wednesday: Mostly sunny, with a high near 57. East northeast wind around 5 mph, with gusts as high as 10 mph.

    High: 57 °F

    Mostly Sunny

  • Wednesday Night

    Wednesday Night: Partly cloudy, with a low around 46. East wind around 5 mph becoming south after midnight. Winds could gust as high as 10 mph.

    Low: 46 °F

    Partly Cloudy

  • Thursday

    Thursday: Mostly sunny, with a high near 72.

    High: 72 °F

    Mostly Sunny

  • Thursday Night

    Thursday Night: A 50 percent chance of showers and thunderstorms, mainly after 1am. Mostly cloudy, with a low around 57.

    Low: 57 °F

    Slight Chance
    T-storms then
    Chance
    Showers

  • Friday

    Friday: A chance of showers, then showers likely and possibly a thunderstorm after 1pm. Mostly cloudy, with a high near 68.

    High: 68 °F

    Showers
    Likely

  • Friday Night

    Friday Night: A chance of showers before 1am. Mostly cloudy, with a low around 45.

    Low: 45 °F

    Chance
    Showers

Detailed Forecast

Tonight
Mostly cloudy, with a temperature rising to around 45 by 4am. South wind 10 to 15 mph, with gusts as high as 25 mph.
Tuesday
A 20 percent chance of showers and thunderstorms after 2pm. Mostly sunny, with a high near 73. Southwest wind 10 to 15 mph, with gusts as high as 25 mph.
Tuesday Night
Partly cloudy, with a low around 44. West wind around 5 mph becoming north after midnight. Winds could gust as high as 10 mph.
Wednesday
Mostly sunny, with a high near 57. East northeast wind around 5 mph, with gusts as high as 10 mph.
Wednesday Night
Partly cloudy, with a low around 46. East wind around 5 mph becoming south after midnight. Winds could gust as high as 10 mph.
Thursday
Mostly sunny, with a high near 72.
Thursday Night
A 50 percent chance of showers and thunderstorms, mainly after 1am. Mostly cloudy, with a low around 57.
Friday
A chance of showers, then showers likely and possibly a thunderstorm after 1pm. Mostly cloudy, with a high near 68.
Friday Night
A chance of showers before 1am. Mostly cloudy, with a low around 45.
Saturday
Mostly sunny, with a high near 59.
Saturday Night
Mostly cloudy, with a low around 43.
Sunday
Partly sunny, with a high near 55.
Sunday Night
A chance of showers. Mostly cloudy, with a low around 43.
Monday
A chance of showers. Mostly cloudy, with a high near 57.
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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:
8:41 pm CDT Apr 20, 2026
Forecast Valid:
9pm CDT Apr 20, 2026-6pm CDT Apr 27, 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