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

79°F

26°C

Humidity 50%
Wind Speed W 8 mph
Barometer 30.03 in (1015.7 mb)
Dewpoint 59°F (15°C)
Visibility 10.00 mi
Heat Index80°F (27°C)
Last update 13 Jul 11:51 am CDT
Extended Forecast for

Grayslake IL

  • This Afternoon

    This Afternoon: Partly sunny, with a high near 80. West wind 5 to 10 mph.

    High: 80 °F

    Partly Sunny

  • Tonight

    Tonight: Partly cloudy, with a low around 64. West wind around 5 mph becoming calm in the evening.

    Low: 64 °F

    Partly Cloudy

  • Monday

    Monday: Sunny, with a high near 86. West southwest wind around 5 mph, with gusts as high as 10 mph.

    High: 86 °F

    Sunny

  • Monday Night

    Monday Night: Mostly clear, with a low around 66. West southwest wind around 5 mph becoming calm in the evening.

    Low: 66 °F

    Mostly Clear

  • Tuesday

    Tuesday: Sunny, with a high near 88. South wind 5 to 10 mph.

    High: 88 °F

    Sunny

  • Tuesday Night

    Tuesday Night: Partly cloudy, with a low around 70.

    Low: 70 °F

    Partly Cloudy

  • Wednesday

    Wednesday: A slight chance of showers, then a chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 87. Chance of precipitation is 50%.

    High: 87 °F

    Slight Chance
    Showers then
    Chance
    Showers

  • Wednesday Night

    Wednesday Night: A chance of showers and thunderstorms before 1am. Mostly cloudy, with a low around 66.

    Low: 66 °F

    Chance
    T-storms

  • Thursday

    Thursday: A chance of showers and thunderstorms after 1pm. Partly sunny, with a high near 78.

    High: 78 °F

    Mostly Cloudy
    then Chance
    T-storms

Detailed Forecast

This Afternoon
Partly sunny, with a high near 80. West wind 5 to 10 mph.
Tonight
Partly cloudy, with a low around 64. West wind around 5 mph becoming calm in the evening.
Monday
Sunny, with a high near 86. West southwest wind around 5 mph, with gusts as high as 10 mph.
Monday Night
Mostly clear, with a low around 66. West southwest wind around 5 mph becoming calm in the evening.
Tuesday
Sunny, with a high near 88. South wind 5 to 10 mph.
Tuesday Night
Partly cloudy, with a low around 70.
Wednesday
A slight chance of showers, then a chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 87. Chance of precipitation is 50%.
Wednesday Night
A chance of showers and thunderstorms before 1am. Mostly cloudy, with a low around 66.
Thursday
A chance of showers and thunderstorms after 1pm. Partly sunny, with a high near 78.
Thursday Night
Partly cloudy, with a low around 60.
Friday
Mostly sunny, with a high near 77.
Friday Night
Partly cloudy, with a low around 61.
Saturday
A chance of showers. Partly sunny, with a high near 80.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Grayslake IL
 42.37°N 88.05°W
Last Update:
9:56 am CDT Jul 13, 2025
Forecast Valid:
12pm CDT Jul 13, 2025-6pm CDT Jul 19, 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