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

59°F

15°C

Humidity 87%
Wind Speed SW 15 mph
Barometer 29.57 in (1000.9 mb)
Dewpoint 55°F (13°C)
Visibility 10.00 mi
Last update 15 Nov 3:51 am CST
Extended Forecast for

Zion IL

  • Today

    Today: Mostly cloudy, then gradually becoming sunny, with a high near 66. Southwest wind around 15 mph becoming northwest in the afternoon. Winds could gust as high as 30 mph.

    High: 66 °F

    Decreasing
    Clouds

  • Tonight

    Tonight: Mostly clear, with a low around 34. Northwest wind around 15 mph, with gusts as high as 25 mph.

    Low: 34 °F

    Mostly Clear

  • Sunday

    Sunday: Sunny, with a high near 47. Northwest wind 10 to 15 mph, with gusts as high as 20 mph.

    High: 47 °F

    Sunny

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 30. Northwest wind 5 to 10 mph, with gusts as high as 15 mph.

    Low: 30 °F

    Mostly Clear

  • Monday

    Monday: Mostly sunny, with a high near 45. Northwest wind around 5 mph becoming northeast in the afternoon.

    High: 45 °F

    Mostly Sunny

  • Monday Night

    Monday Night: Rain likely, mainly after midnight. Cloudy, with a low around 37. Chance of precipitation is 60%.

    Low: 37 °F

    Chance Rain
    then Rain
    Likely

  • Tuesday

    Tuesday: A 50 percent chance of rain. Mostly cloudy, with a high near 45.

    High: 45 °F

    Chance Rain

  • 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

Detailed Forecast

Today
Mostly cloudy, then gradually becoming sunny, with a high near 66. Southwest wind around 15 mph becoming northwest in the afternoon. Winds could gust as high as 30 mph.
Tonight
Mostly clear, with a low around 34. Northwest wind around 15 mph, with gusts as high as 25 mph.
Sunday
Sunny, with a high near 47. Northwest wind 10 to 15 mph, with gusts as high as 20 mph.
Sunday Night
Mostly clear, with a low around 30. Northwest wind 5 to 10 mph, with gusts as high as 15 mph.
Monday
Mostly sunny, with a high near 45. Northwest wind around 5 mph becoming northeast in the afternoon.
Monday Night
Rain likely, mainly after midnight. Cloudy, with a low around 37. Chance of precipitation is 60%.
Tuesday
A 50 percent chance of rain. Mostly cloudy, with a high near 45.
Tuesday Night
Mostly cloudy, with a low around 38.
Wednesday
Mostly cloudy, with a high near 47.
Wednesday Night
A chance of rain after midnight. Mostly cloudy, with a low around 39.
Thursday
Rain likely. Mostly cloudy, with a high near 50.
Thursday Night
Rain likely. Mostly cloudy, with a low around 42.
Friday
A chance of rain. Mostly cloudy, with a high near 51.
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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:
3:46 am CST Nov 15, 2025
Forecast Valid:
4am CST Nov 15, 2025-6pm CST Nov 21, 2025
 
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