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.

Fair

73°F

23°C

Humidity 46%
Wind Speed S 13 G 24 mph
Barometer 29.82 in (1009.3 mb)
Dewpoint 51°F (11°C)
Visibility 10.00 mi
Last update 15 May 3:51 pm CDT
Extended Forecast for

Zion IL

  • Tonight

    Tonight: A chance of showers and thunderstorms between 1am and 2am, then periods of showers and possibly a thunderstorm after 2am. Low around 57. South wind 10 to 15 mph, with gusts as high as 25 mph. Chance of precipitation is 90%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.

    Low: 57 °F

    Mostly Clear
    then Showers

  • Saturday

    Saturday: Scattered showers and thunderstorms, mainly before 8am. Mostly cloudy, then gradually becoming sunny, with a high near 80. South wind around 10 mph, with gusts as high as 15 mph. Chance of precipitation is 30%.

    High: 80 °F

    Scattered
    Showers then
    Mostly Sunny

  • Saturday Night

    Saturday Night: A 20 percent chance of showers and thunderstorms after midnight. Mostly cloudy, with a low around 53. South southeast wind around 5 mph.

    Low: 53 °F

    Partly Cloudy
    then Slight
    Chance
    T-storms

  • Sunday

    Sunday: A 30 percent chance of showers and thunderstorms, mainly before 10am. Mostly cloudy, with a high near 71. Breezy, with a southeast wind 10 to 20 mph, with gusts as high as 30 mph.

    High: 71 °F

    Chance
    Showers then
    Slight Chance
    T-storms and
    Breezy

  • Sunday Night

    Sunday Night: Partly cloudy, with a low around 63. Breezy, with a south wind 15 to 20 mph, with gusts as high as 30 mph.

    Low: 63 °F

    Partly Cloudy
    and Breezy

  • Monday

    Monday: A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 1pm. Mostly sunny, with a high near 82. Breezy. Chance of precipitation is 60%.

    High: 82 °F

    Breezy.
    Chance
    T-storms then
    Showers
    Likely

  • Monday Night

    Monday Night: Showers likely and possibly a thunderstorm before 1am, then a chance of showers and thunderstorms after 1am. Mostly cloudy, with a low around 61. Breezy. Chance of precipitation is 60%.

    Low: 61 °F

    Showers
    Likely and
    Breezy

  • Tuesday

    Tuesday: A chance of showers after 1pm. Partly sunny, with a high near 76. Breezy.

    High: 76 °F

    Breezy.
    Partly Sunny
    then Chance
    Showers

  • Tuesday Night

    Tuesday Night: A chance of showers before 1am. Mostly cloudy, with a low around 50.

    Low: 50 °F

    Chance
    Showers

Detailed Forecast

Tonight
A chance of showers and thunderstorms between 1am and 2am, then periods of showers and possibly a thunderstorm after 2am. Low around 57. South wind 10 to 15 mph, with gusts as high as 25 mph. Chance of precipitation is 90%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.
Saturday
Scattered showers and thunderstorms, mainly before 8am. Mostly cloudy, then gradually becoming sunny, with a high near 80. South wind around 10 mph, with gusts as high as 15 mph. Chance of precipitation is 30%.
Saturday Night
A 20 percent chance of showers and thunderstorms after midnight. Mostly cloudy, with a low around 53. South southeast wind around 5 mph.
Sunday
A 30 percent chance of showers and thunderstorms, mainly before 10am. Mostly cloudy, with a high near 71. Breezy, with a southeast wind 10 to 20 mph, with gusts as high as 30 mph.
Sunday Night
Partly cloudy, with a low around 63. Breezy, with a south wind 15 to 20 mph, with gusts as high as 30 mph.
Monday
A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 1pm. Mostly sunny, with a high near 82. Breezy. Chance of precipitation is 60%.
Monday Night
Showers likely and possibly a thunderstorm before 1am, then a chance of showers and thunderstorms after 1am. Mostly cloudy, with a low around 61. Breezy. Chance of precipitation is 60%.
Tuesday
A chance of showers after 1pm. Partly sunny, with a high near 76. Breezy.
Tuesday Night
A chance of showers before 1am. Mostly cloudy, with a low around 50.
Wednesday
Mostly sunny, with a high near 63.
Wednesday Night
Partly cloudy, with a low around 46.
Thursday
Mostly sunny, with a high near 58.
Thursday Night
Partly cloudy, with a low around 48.
Friday
Mostly sunny, with a high near 61.
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ABOUT THIS FORECAST

 
Point Forecast:
Zion IL
 42.45°N 87.81°W
Last Update:
1:45 pm CDT May 15, 2026
Forecast Valid:
4pm CDT May 15, 2026-6pm CDT May 22, 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