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.

Fair

49°F

9°C

Humidity 86%
Wind Speed Calm
Barometer 30.22 in (1022.9 mb)
Dewpoint 45°F (7°C)
Visibility 10.00 mi
Last update 31 Aug 2:51 am CDT
Extended Forecast for

Grayslake IL

  • Overnight

    Overnight: Mostly clear, with a low around 50. Calm wind becoming north around 5 mph.

    Low: 50 °F

    Mostly Clear

  • Sunday

    Sunday: Sunny, with a high near 76. Light and variable wind becoming east 5 to 10 mph in the morning.

    High: 76 °F

    Sunny

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 53. East wind around 5 mph becoming calm in the evening.

    Low: 53 °F

    Mostly Clear

  • Labor Day

    Labor Day: Sunny, with a high near 77. Calm wind becoming east around 5 mph in the afternoon.

    High: 77 °F

    Sunny

  • Monday Night

    Monday Night: Mostly clear, with a low around 55. East northeast wind around 5 mph becoming calm in the evening.

    Low: 55 °F

    Mostly Clear

  • Tuesday

    Tuesday: Sunny, with a high near 79.

    High: 79 °F

    Sunny

  • Tuesday Night

    Tuesday Night: Mostly clear, with a low around 57.

    Low: 57 °F

    Mostly Clear

  • Wednesday

    Wednesday: A chance of showers, then showers likely and possibly a thunderstorm after 1pm. Partly sunny, with a high near 75.

    High: 75 °F

    Showers
    Likely

  • Wednesday Night

    Wednesday Night: A chance of showers before 1am. Mostly cloudy, with a low around 47.

    Low: 47 °F

    Chance
    Showers

Detailed Forecast

Overnight
Mostly clear, with a low around 50. Calm wind becoming north around 5 mph.
Sunday
Sunny, with a high near 76. Light and variable wind becoming east 5 to 10 mph in the morning.
Sunday Night
Mostly clear, with a low around 53. East wind around 5 mph becoming calm in the evening.
Labor Day
Sunny, with a high near 77. Calm wind becoming east around 5 mph in the afternoon.
Monday Night
Mostly clear, with a low around 55. East northeast wind around 5 mph becoming calm in the evening.
Tuesday
Sunny, with a high near 79.
Tuesday Night
Mostly clear, with a low around 57.
Wednesday
A chance of showers, then showers likely and possibly a thunderstorm after 1pm. Partly sunny, with a high near 75.
Wednesday Night
A chance of showers before 1am. Mostly cloudy, with a low around 47.
Thursday
Partly sunny, with a high near 61.
Thursday Night
Mostly cloudy, with a low around 46.
Friday
A chance of showers. Partly sunny, with a high near 65.
Friday Night
Partly cloudy, with a low around 47.
Saturday
Sunny, with a high near 68.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Grayslake IL
 42.37°N 88.05°W
Last Update:
3:26 am CDT Aug 31, 2025
Forecast Valid:
3am CDT Aug 31, 2025-6pm CDT Sep 6, 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