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

72°F

22°C

Humidity 38%
Wind Speed SW 17 mph
Barometer 29.66 in (1004.2 mb)
Dewpoint 45°F (7°C)
Visibility 10.00 mi
Last update 21 Mar 4:51 pm CDT
Extended Forecast for

Zion IL

  • Tonight

    Tonight: Patchy fog after 4am. Otherwise, mostly cloudy, with a low around 39. Southwest wind 5 to 15 mph becoming north northeast after midnight. Winds could gust as high as 25 mph.

    Low: 39 °F

    Mostly Cloudy
    then Patchy
    Fog

  • Sunday

    Sunday: A 20 percent chance of showers before 4pm. Patchy fog before 4pm. Otherwise, mostly cloudy, with a temperature falling to around 37 by 4pm. Breezy, with a north wind 15 to 20 mph, with gusts as high as 30 mph.

    High: 40 °F⇓

    Slight Chance
    Showers and
    Patchy Fog

  • Sunday Night

    Sunday Night: Mostly cloudy, with a low around 30. Blustery, with a north wind 10 to 20 mph, with gusts as high as 30 mph.

    Low: 30 °F

    Mostly Cloudy
    and Blustery
    then Mostly
    Cloudy

  • Monday

    Monday: Mostly sunny, with a high near 40. North wind around 5 mph becoming east northeast in the afternoon. Winds could gust as high as 15 mph.

    High: 40 °F

    Mostly Sunny

  • Monday Night

    Monday Night: Partly cloudy, with a low around 32. East wind around 5 mph becoming south after midnight. Winds could gust as high as 10 mph.

    Low: 32 °F

    Partly Cloudy

  • Tuesday

    Tuesday: Mostly cloudy, with a high near 50.

    High: 50 °F

    Mostly Cloudy

  • Tuesday Night

    Tuesday Night: Mostly cloudy, with a low around 38.

    Low: 38 °F

    Mostly Cloudy

  • Wednesday

    Wednesday: Mostly cloudy, with a high near 47.

    High: 47 °F

    Mostly Cloudy

  • Wednesday Night

    Wednesday Night: Mostly cloudy, with a low around 43.

    Low: 43 °F

    Mostly Cloudy

Detailed Forecast

Tonight
Patchy fog after 4am. Otherwise, mostly cloudy, with a low around 39. Southwest wind 5 to 15 mph becoming north northeast after midnight. Winds could gust as high as 25 mph.
Sunday
A 20 percent chance of showers before 4pm. Patchy fog before 4pm. Otherwise, mostly cloudy, with a temperature falling to around 37 by 4pm. Breezy, with a north wind 15 to 20 mph, with gusts as high as 30 mph.
Sunday Night
Mostly cloudy, with a low around 30. Blustery, with a north wind 10 to 20 mph, with gusts as high as 30 mph.
Monday
Mostly sunny, with a high near 40. North wind around 5 mph becoming east northeast in the afternoon. Winds could gust as high as 15 mph.
Monday Night
Partly cloudy, with a low around 32. East wind around 5 mph becoming south after midnight. Winds could gust as high as 10 mph.
Tuesday
Mostly cloudy, with a high near 50.
Tuesday Night
Mostly cloudy, with a low around 38.
Wednesday
Mostly cloudy, with a high near 47.
Wednesday Night
Mostly cloudy, with a low around 43.
Thursday
Mostly cloudy, with a high near 56.
Thursday Night
Mostly cloudy, with a low around 31.
Friday
Partly sunny, with a high near 41.
Friday Night
Partly cloudy, with a low around 30.
Saturday
Mostly sunny, with a high near 44.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Zion IL
 42.45°N 87.81°W
Last Update:
3:06 pm CDT Mar 21, 2026
Forecast Valid:
5pm CDT Mar 21, 2026-6pm CDT Mar 28, 2026
 
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Additional Resources

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Hourly Weather Forecast

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High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation