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

58°F

14°C

Humidity 58%
Wind Speed W 13 mph
Barometer 29.74 in (1007.3 mb)
Dewpoint 43°F (6°C)
Visibility 10.00 mi
Last update 20 Mar 8:51 am CDT
Extended Forecast for

Zion IL

  • Today

    Today: Mostly cloudy, with a temperature rising to near 60 by noon, then falling to around 44 during the remainder of the day. West southwest wind 10 to 15 mph becoming north northeast in the afternoon. Winds could gust as high as 20 mph.

    High: 60 °F⇓

    Mostly Cloudy

  • Tonight

    Tonight: Mostly cloudy, with a low around 37. North northeast wind 5 to 10 mph becoming east after midnight. Winds could gust as high as 15 mph.

    Low: 37 °F

    Mostly Cloudy

  • Saturday

    Saturday: Partly sunny, with a high near 54. East wind 5 to 15 mph becoming south in the afternoon. Winds could gust as high as 20 mph.

    High: 54 °F

    Partly Sunny

  • Saturday Night

    Saturday Night: Partly cloudy, with a low around 44. Southwest wind around 10 mph, with gusts as high as 15 mph.

    Low: 44 °F

    Partly Cloudy

  • Sunday

    Sunday: A 30 percent chance of showers, mainly before 1pm. Mostly cloudy, with a high near 48. Breezy, with a north wind 10 to 20 mph, with gusts as high as 30 mph.

    High: 48 °F

    Chance
    Showers and
    Breezy

  • Sunday Night

    Sunday Night: Mostly cloudy, with a low around 32.

    Low: 32 °F

    Mostly Cloudy

  • Monday

    Monday: Mostly sunny, with a high near 40.

    High: 40 °F

    Mostly Sunny

  • Monday Night

    Monday Night: Mostly cloudy, with a low around 32.

    Low: 32 °F

    Mostly Cloudy

  • Tuesday

    Tuesday: Mostly cloudy, with a high near 50.

    High: 50 °F

    Mostly Cloudy

Detailed Forecast

Today
Mostly cloudy, with a temperature rising to near 60 by noon, then falling to around 44 during the remainder of the day. West southwest wind 10 to 15 mph becoming north northeast in the afternoon. Winds could gust as high as 20 mph.
Tonight
Mostly cloudy, with a low around 37. North northeast wind 5 to 10 mph becoming east after midnight. Winds could gust as high as 15 mph.
Saturday
Partly sunny, with a high near 54. East wind 5 to 15 mph becoming south in the afternoon. Winds could gust as high as 20 mph.
Saturday Night
Partly cloudy, with a low around 44. Southwest wind around 10 mph, with gusts as high as 15 mph.
Sunday
A 30 percent chance of showers, mainly before 1pm. Mostly cloudy, with a high near 48. Breezy, with a north wind 10 to 20 mph, with gusts as high as 30 mph.
Sunday Night
Mostly cloudy, with a low around 32.
Monday
Mostly sunny, with a high near 40.
Monday Night
Mostly cloudy, with a low around 32.
Tuesday
Mostly cloudy, with a high near 50.
Tuesday Night
Mostly cloudy, with a low around 35.
Wednesday
Partly sunny, with a high near 47.
Wednesday Night
Partly cloudy, with a low around 39.
Thursday
A chance of showers. Partly sunny, with a high near 55.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Zion IL
 42.45°N 87.81°W
Last Update:
9:01 am CDT Mar 20, 2026
Forecast Valid:
9am CDT Mar 20, 2026-6pm CDT Mar 26, 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