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Hazardous Weather Conditions

Current conditions at

Chicago/Waukegan Regional Airport (KUGN)

Lat: 42.43°NLon: 87.86°WElev: 709ft.

Partly Cloudy

30°C

86°F

Humidity 55%
Wind Speed E 11 km/h
Barometer 1014.6 mb (30.00 in)
Dewpoint 20°C (68°F)
Visibility 16 km
Heat Index32°C (89°F)
Last update 3 Jul 1:51 pm CDT
Extended Forecast for

Grayslake IL

  • This Afternoon

    This Afternoon: A 20 percent chance of showers and thunderstorms after 4pm. Mostly sunny, with a high near 33. North wind 10 to 15 km/h becoming east southeast.

    High: 33 °C

    Slight Chance
    T-storms

  • Tonight

    Tonight: A slight chance of showers and thunderstorms before 1am, then a slight chance of showers between 1am and 4am, then a chance of showers and thunderstorms after 4am. Partly cloudy, with a low around 21. East wind 10 to 15 km/h becoming south southwest after midnight. Chance of precipitation is 40%.

    Low: 21 °C

    Slight Chance
    T-storms then
    Chance
    Showers

  • Independence Day

    Independence Day: A 50 percent chance of showers and thunderstorms, mainly before 1pm. Partly sunny, with a high near 33. Heat index values as high as 36. South southwest wind 10 to 15 km/h, with gusts as high as 25 km/h.

    High: 33 °C

    Chance
    T-storms

  • Friday Night

    Friday Night: Mostly clear, with a low around 22. South southwest wind 10 to 15 km/h, with gusts as high as 25 km/h.

    Low: 22 °C

    Mostly Clear

  • Saturday

    Saturday: Mostly sunny and hot, with a high near 35. South southwest wind 15 to 20 km/h increasing to 20 to 25 km/h in the afternoon. Winds could gust as high as 35 km/h.

    High: 35 °C

    Hot

  • Saturday Night

    Saturday Night: A 30 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 23.

    Low: 23 °C

    Chance
    T-storms

  • Sunday

    Sunday: A 40 percent chance of showers and thunderstorms, mainly after 1pm. Mostly cloudy, with a high near 30.

    High: 30 °C

    Chance
    T-storms

  • Sunday Night

    Sunday Night: Mostly cloudy, with a low around 18.

    Low: 18 °C

    Mostly Cloudy

  • Monday

    Monday: Mostly sunny, with a high near 28.

    High: 28 °C

    Mostly Sunny

Detailed Forecast

This Afternoon
A 20 percent chance of showers and thunderstorms after 4pm. Mostly sunny, with a high near 33. North wind 10 to 15 km/h becoming east southeast.
Tonight
A slight chance of showers and thunderstorms before 1am, then a slight chance of showers between 1am and 4am, then a chance of showers and thunderstorms after 4am. Partly cloudy, with a low around 21. East wind 10 to 15 km/h becoming south southwest after midnight. Chance of precipitation is 40%.
Independence Day
A 50 percent chance of showers and thunderstorms, mainly before 1pm. Partly sunny, with a high near 33. Heat index values as high as 36. South southwest wind 10 to 15 km/h, with gusts as high as 25 km/h.
Friday Night
Mostly clear, with a low around 22. South southwest wind 10 to 15 km/h, with gusts as high as 25 km/h.
Saturday
Mostly sunny and hot, with a high near 35. South southwest wind 15 to 20 km/h increasing to 20 to 25 km/h in the afternoon. Winds could gust as high as 35 km/h.
Saturday Night
A 30 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 23.
Sunday
A 40 percent chance of showers and thunderstorms, mainly after 1pm. Mostly cloudy, with a high near 30.
Sunday Night
Mostly cloudy, with a low around 18.
Monday
Mostly sunny, with a high near 28.
Monday Night
Mostly clear, with a low around 17.
Tuesday
Partly sunny, with a high near 29.
Tuesday Night
Mostly cloudy, with a low around 18.
Wednesday
A chance of showers. Mostly sunny, with a high near 29.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Grayslake IL
 42.35°N 88.02°W
Last Update:
1:56 pm CDT Jul 3, 2025
Forecast Valid:
2pm CDT Jul 3, 2025-6pm CDT Jul 9, 2025
 
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Additional Resources

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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