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.

Light Rain

67°F

19°C

Humidity 91%
Wind Speed NW 5 mph
Barometer 29.72 in (1005.3 mb)
Dewpoint 64°F (18°C)
Visibility 8.00 mi
Last update 18 Jun 10:51 pm CDT
Extended Forecast for

Grayslake IL

  • Tonight

    Tonight: A 50 percent chance of showers. Cloudy, with a steady temperature around 65. Northwest wind 5 to 10 mph.

    Low: 65 °F

    Chance
    Showers

  • Juneteenth

    Juneteenth: A 30 percent chance of showers, mainly before 9am. Mostly cloudy, then gradually becoming sunny, with a high near 82. West northwest wind 5 to 10 mph, with gusts as high as 20 mph.

    High: 82 °F

    Chance
    Showers then
    Mostly Sunny

  • Thursday Night

    Thursday Night: Mostly clear, with a low around 64. Southwest wind around 5 mph, with gusts as high as 10 mph.

    Low: 64 °F

    Mostly Clear

  • Friday

    Friday: A slight chance of showers between 1pm and 4pm, then a slight chance of showers and thunderstorms after 4pm. Partly sunny, with a high near 84. South southwest wind 10 to 15 mph, with gusts as high as 25 mph. Chance of precipitation is 20%.

    High: 84 °F

    Partly Sunny
    then Slight
    Chance
    T-storms

  • Friday Night

    Friday Night: A slight chance of thunderstorms before 7pm. Mostly clear, with a low around 72. South wind around 15 mph, with gusts as high as 25 mph. Chance of precipitation is 10%.

    Low: 72 °F

    Slight Chance
    T-storms then
    Mostly Clear

  • Saturday

    Saturday: Sunny, with a high near 94. Breezy.

    High: 94 °F

    Sunny and
    Breezy

  • Saturday Night

    Saturday Night: Clear, with a low around 76.

    Low: 76 °F

    Clear

  • Sunday

    Sunday: Sunny and hot, with a high near 95.

    High: 95 °F

    Hot

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 76.

    Low: 76 °F

    Mostly Clear

Detailed Forecast

Tonight
A 50 percent chance of showers. Cloudy, with a steady temperature around 65. Northwest wind 5 to 10 mph.
Juneteenth
A 30 percent chance of showers, mainly before 9am. Mostly cloudy, then gradually becoming sunny, with a high near 82. West northwest wind 5 to 10 mph, with gusts as high as 20 mph.
Thursday Night
Mostly clear, with a low around 64. Southwest wind around 5 mph, with gusts as high as 10 mph.
Friday
A slight chance of showers between 1pm and 4pm, then a slight chance of showers and thunderstorms after 4pm. Partly sunny, with a high near 84. South southwest wind 10 to 15 mph, with gusts as high as 25 mph. Chance of precipitation is 20%.
Friday Night
A slight chance of thunderstorms before 7pm. Mostly clear, with a low around 72. South wind around 15 mph, with gusts as high as 25 mph. Chance of precipitation is 10%.
Saturday
Sunny, with a high near 94. Breezy.
Saturday Night
Clear, with a low around 76.
Sunday
Sunny and hot, with a high near 95.
Sunday Night
Mostly clear, with a low around 76.
Monday
Sunny and hot, with a high near 95.
Monday Night
Mostly clear, with a low around 73.
Tuesday
A chance of showers. Mostly sunny, with a high near 91.
Tuesday Night
A chance of showers and thunderstorms. Mostly cloudy, with a low around 65.
Wednesday
Showers likely. Partly sunny, with a high near 84.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Grayslake IL
 42.35°N 88.05°W
Last Update:
8:56 pm CDT Jun 18, 2025
Forecast Valid:
11pm CDT Jun 18, 2025-6pm CDT Jun 25, 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