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

67°F

19°C

Humidity 47%
Wind Speed SW 10 mph
Barometer 29.85 in (1010.8 mb)
Dewpoint 46°F (8°C)
Visibility 10.00 mi
Last update 12 May 2:51 pm CDT
Extended Forecast for

Zion IL

  • This Afternoon

    This Afternoon: Scattered showers and thunderstorms before 4pm. Mostly cloudy, with a high near 70. Southwest wind around 15 mph, with gusts as high as 35 mph. Chance of precipitation is 40%.

    High: 70 °F

    Scattered
    Showers

  • Tonight

    Tonight: Isolated showers and thunderstorms between 7pm and 9pm. Mostly cloudy, then gradually becoming mostly clear, with a low around 48. Southwest wind 10 to 15 mph becoming northwest after midnight. Winds could gust as high as 25 mph. Chance of precipitation is 20%.

    Low: 48 °F

    Isolated
    T-storms then
    Mostly Clear

  • Wednesday

    Wednesday: Partly sunny, with a high near 56. North wind around 15 mph, with gusts as high as 25 mph.

    High: 56 °F

    Partly Sunny

  • Wednesday Night

    Wednesday Night: Mostly cloudy, then gradually becoming clear, with a low around 41. North northeast wind 5 to 10 mph becoming light and variable in the evening. Winds could gust as high as 15 mph.

    Low: 41 °F

    Decreasing
    Clouds

  • Thursday

    Thursday: Sunny, with a high near 57. Light and variable wind becoming east southeast 5 to 10 mph in the afternoon.

    High: 57 °F

    Sunny

  • Thursday Night

    Thursday Night: Scattered showers and thunderstorms after 1am. Mostly cloudy, with a low around 47. Chance of precipitation is 40%.

    Low: 47 °F

    Partly Cloudy
    then
    Scattered
    Showers

  • Friday

    Friday: Scattered showers and thunderstorms before 1pm. Partly sunny, with a high near 76. Chance of precipitation is 30%.

    High: 76 °F

    Scattered
    Showers

  • Friday Night

    Friday Night: Mostly clear, with a low around 55.

    Low: 55 °F

    Mostly Clear

  • Saturday

    Saturday: Sunny, with a high near 81.

    High: 81 °F

    Sunny

Detailed Forecast

This Afternoon
Scattered showers and thunderstorms before 4pm. Mostly cloudy, with a high near 70. Southwest wind around 15 mph, with gusts as high as 35 mph. Chance of precipitation is 40%.
Tonight
Isolated showers and thunderstorms between 7pm and 9pm. Mostly cloudy, then gradually becoming mostly clear, with a low around 48. Southwest wind 10 to 15 mph becoming northwest after midnight. Winds could gust as high as 25 mph. Chance of precipitation is 20%.
Wednesday
Partly sunny, with a high near 56. North wind around 15 mph, with gusts as high as 25 mph.
Wednesday Night
Mostly cloudy, then gradually becoming clear, with a low around 41. North northeast wind 5 to 10 mph becoming light and variable in the evening. Winds could gust as high as 15 mph.
Thursday
Sunny, with a high near 57. Light and variable wind becoming east southeast 5 to 10 mph in the afternoon.
Thursday Night
Scattered showers and thunderstorms after 1am. Mostly cloudy, with a low around 47. Chance of precipitation is 40%.
Friday
Scattered showers and thunderstorms before 1pm. Partly sunny, with a high near 76. Chance of precipitation is 30%.
Friday Night
Mostly clear, with a low around 55.
Saturday
Sunny, with a high near 81.
Saturday Night
Scattered showers and thunderstorms. Mostly cloudy, with a low around 52.
Sunday
Scattered showers and thunderstorms. Mostly cloudy, with a high near 74.
Sunday Night
Scattered showers and thunderstorms. Mostly cloudy, with a low around 57.
Monday
Showers and thunderstorms likely. Mostly cloudy, with a high near 82.
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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:
3:21 pm CDT May 12, 2026
Forecast Valid:
3pm CDT May 12, 2026-6pm CDT May 18, 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