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

47°F

8°C

Humidity 86%
Wind Speed W 10 G 23 mph
Barometer 29.67 in (1004.3 mb)
Dewpoint 43°F (6°C)
Visibility 10.00 mi
Wind Chill42°F (6°C)
Last update 18 Apr 5:51 am CDT
Extended Forecast for

Zion IL

Flood Warning until April 18, 08:00am
Click here for hazard details and duration
...
  •  
    Flood Warning until April 18, 08:00am

    NOW until 8:00am Sat

    Flood Warning

  • Today

    High: 49 °F

    Decreasing
    Clouds and
    Breezy

  • Tonight

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

    Low: 35 °F

    Mostly Clear

  • Sunday

    Sunday: A 30 percent chance of showers after 1pm. Partly sunny, with a high near 48. West southwest wind 10 to 15 mph becoming northwest in the afternoon. Winds could gust as high as 25 mph.

    High: 48 °F

    Mostly Sunny
    then Chance
    Showers

  • Sunday Night

    Sunday Night: Widespread frost, mainly after 5am. Otherwise, partly cloudy, with a low around 33. North northwest wind 5 to 10 mph becoming northeast after midnight. Winds could gust as high as 15 mph.

    Low: 33 °F

    Partly Cloudy
    then Frost

  • Monday

    Monday: Widespread frost, mainly before 7am. Otherwise, sunny, with a high near 48. Light and variable wind becoming southeast 5 to 10 mph in the morning.

    High: 48 °F

    Frost then
    Sunny

  • Monday Night

    Monday Night: Mostly cloudy, with a low around 41.

    Low: 41 °F

    Mostly Cloudy

  • Tuesday

    Tuesday: Mostly sunny, with a high near 70.

    High: 70 °F

    Mostly Sunny

  • Tuesday Night

    Tuesday Night: Partly cloudy, with a low around 46.

    Low: 46 °F

    Partly Cloudy

Detailed Forecast

Today
Cloudy, then gradually becoming mostly sunny, with a high near 49. Breezy, with a west wind around 20 mph, with gusts as high as 30 mph.
Tonight
Mostly clear, with a low around 35. West wind 10 to 15 mph, with gusts as high as 25 mph.
Sunday
A 30 percent chance of showers after 1pm. Partly sunny, with a high near 48. West southwest wind 10 to 15 mph becoming northwest in the afternoon. Winds could gust as high as 25 mph.
Sunday Night
Widespread frost, mainly after 5am. Otherwise, partly cloudy, with a low around 33. North northwest wind 5 to 10 mph becoming northeast after midnight. Winds could gust as high as 15 mph.
Monday
Widespread frost, mainly before 7am. Otherwise, sunny, with a high near 48. Light and variable wind becoming southeast 5 to 10 mph in the morning.
Monday Night
Mostly cloudy, with a low around 41.
Tuesday
Mostly sunny, with a high near 70.
Tuesday Night
Partly cloudy, with a low around 46.
Wednesday
Sunny, with a high near 62.
Wednesday Night
Mostly clear, with a low around 48.
Thursday
Mostly sunny, with a high near 72.
Thursday Night
Showers likely. Mostly cloudy, with a low around 55.
Friday
A chance of showers. Mostly cloudy, with a high near 67.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Zion IL
 42.45°N 87.84°W
Last Update:
3:06 am CDT Apr 18, 2026
Forecast Valid:
6am CDT Apr 18, 2026-6pm CDT Apr 24, 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