Current conditions at

Chicago/Waukegan Regional Airport (KUGN)

Lat: 42.43°NLon: 87.86°WElev: 709ft.

Fog

50°F

10°C

Humidity 100%
Wind Speed NE 6 mph
Barometer 29.88 in (1011.9 mb)
Dewpoint 50°F (10°C)
Visibility 0.25 mi
Wind Chill48°F (9°C)
Last update 16 Apr 6:51 pm CDT
Extended Forecast for

Zion IL

Dense Fog Advisory until April 17, 10:00am
Click here for hazard details and duration
Dense Fog Advisory
  •  
    Dense Fog Advisory until April 17, 10:00am

    NOW until 10:00am Fri

    Dense Fog Advisory

  • Tonight

    Low: 42 °F

    Dense Fog

  • Friday

    Friday: Widespread dense fog, mainly before 9am.  Otherwise, mostly cloudy, with a high near 65. South southeast wind 5 to 15 mph, with gusts as high as 30 mph.

    High: 65 °F

    Dense Fog
    then Partly
    Sunny

  • Friday Night

    Friday Night: Showers and thunderstorms likely, then showers and possibly a thunderstorm after 10pm.  Low around 42. South wind around 15 mph becoming west after midnight. Winds could gust as high as 25 mph.  Chance of precipitation is 90%. New rainfall amounts between a half and three quarters of an inch possible.

    Low: 42 °F

    T-storms

  • Saturday

    Saturday: A 20 percent chance of showers before 1pm.  Cloudy, then gradually becoming mostly sunny, with a high near 53. Breezy, with a west wind 15 to 20 mph, with gusts as high as 30 mph.

    High: 53 °F

    Slight Chance
    Showers and
    Breezy

  • Saturday Night

    Saturday Night: Mostly clear, with a low around 35. West northwest wind 10 to 15 mph, with gusts as high as 25 mph.

    Low: 35 °F

    Mostly Clear

  • Sunday

    Sunday: Mostly sunny, with a high near 49.

    High: 49 °F

    Mostly Sunny

  • Sunday Night

    Sunday Night: Areas of frost after 3am.  Otherwise, mostly clear, with a low around 33.

    Low: 33 °F

    Partly Cloudy
    then Areas
    Frost

  • Monday

    Monday: Sunny, with a high near 51.

    High: 51 °F

    Sunny

Detailed Forecast

Tonight
Widespread dense fog, mainly after 8pm. Otherwise, mostly cloudy, with a low around 42. Northeast wind around 5 mph becoming south southeast after midnight.
Friday
Widespread dense fog, mainly before 9am. Otherwise, mostly cloudy, with a high near 65. South southeast wind 5 to 15 mph, with gusts as high as 30 mph.
Friday Night
Showers and thunderstorms likely, then showers and possibly a thunderstorm after 10pm. Low around 42. South wind around 15 mph becoming west after midnight. Winds could gust as high as 25 mph. Chance of precipitation is 90%. New rainfall amounts between a half and three quarters of an inch possible.
Saturday
A 20 percent chance of showers before 1pm. Cloudy, then gradually becoming mostly sunny, with a high near 53. Breezy, with a west wind 15 to 20 mph, with gusts as high as 30 mph.
Saturday Night
Mostly clear, with a low around 35. West northwest wind 10 to 15 mph, with gusts as high as 25 mph.
Sunday
Mostly sunny, with a high near 49.
Sunday Night
Areas of frost after 3am. Otherwise, mostly clear, with a low around 33.
Monday
Sunny, with a high near 51.
Monday Night
Partly cloudy, with a low around 44.
Tuesday
Mostly sunny, with a high near 70.
Tuesday Night
Partly cloudy, with a low around 45.
Wednesday
Sunny, with a high near 53.
Wednesday Night
Mostly clear, with a low around 45.
Thursday
Mostly sunny, with a high near 55.
Basemap Options
Click map to change the forecast location
Loading map...

ABOUT THIS FORECAST

 
Point Forecast:
Zion IL
 42.45°N 87.81°W
7:16 pm CDT Apr 16, 2026
7pm CDT Apr 16, 2026-6pm CDT Apr 23, 2026
 
Get as KML Get as XML

Additional Resources

Radar & Satellite Image

Link to Local Radar Data Link to Satellite Data

Hourly Weather Forecast

National Digital Forecast Database