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.

Overcast and Breezy

33°F

1°C

Humidity 75%
Wind Speed N 24 G 38 mph
Barometer 30.12 in (1020.6 mb)
Dewpoint 26°F (-3°C)
Visibility 10.00 mi
Wind Chill20°F (-7°C)
Last update 26 Mar 10:51 pm CDT
Extended Forecast for

Grayslake IL

  • Tonight

    Tonight: Mostly cloudy, with a low around 28. Blustery, with a north northeast wind 15 to 20 mph, with gusts as high as 35 mph.

    Low: 28 °F

    Mostly Cloudy
    and Blustery

  • Friday

    Friday: Mostly cloudy, then gradually becoming sunny, with a high near 42. Northwest wind 10 to 15 mph, with gusts as high as 20 mph.

    High: 42 °F

    Decreasing
    Clouds

  • Friday Night

    Friday Night: Mostly clear, with a low around 24. North northwest wind 5 to 10 mph, with gusts as high as 15 mph.

    Low: 24 °F

    Mostly Clear

  • Saturday

    Saturday: Mostly sunny, with a high near 48. West northwest wind 5 to 10 mph becoming south southwest 10 to 15 mph in the afternoon. Winds could gust as high as 20 mph.

    High: 48 °F

    Mostly Sunny

  • Saturday Night

    Saturday Night: Mostly cloudy, with a low around 38. South southwest wind around 15 mph.

    Low: 38 °F

    Mostly Cloudy

  • Sunday

    Sunday: Partly sunny, with a high near 62.

    High: 62 °F

    Partly Sunny

  • Sunday Night

    Sunday Night: Partly cloudy, with a low around 45.

    Low: 45 °F

    Partly Cloudy

  • Monday

    Monday: Mostly sunny, with a high near 69.

    High: 69 °F

    Mostly Sunny

  • Monday Night

    Monday Night: A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 1am. Mostly cloudy, with a low around 49.

    Low: 49 °F

    Chance
    T-storms then
    Showers
    Likely

Detailed Forecast

Tonight
Mostly cloudy, with a low around 28. Blustery, with a north northeast wind 15 to 20 mph, with gusts as high as 35 mph.
Friday
Mostly cloudy, then gradually becoming sunny, with a high near 42. Northwest wind 10 to 15 mph, with gusts as high as 20 mph.
Friday Night
Mostly clear, with a low around 24. North northwest wind 5 to 10 mph, with gusts as high as 15 mph.
Saturday
Mostly sunny, with a high near 48. West northwest wind 5 to 10 mph becoming south southwest 10 to 15 mph in the afternoon. Winds could gust as high as 20 mph.
Saturday Night
Mostly cloudy, with a low around 38. South southwest wind around 15 mph.
Sunday
Partly sunny, with a high near 62.
Sunday Night
Partly cloudy, with a low around 45.
Monday
Mostly sunny, with a high near 69.
Monday Night
A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 1am. Mostly cloudy, with a low around 49.
Tuesday
A chance of showers. Mostly cloudy, with a high near 71.
Tuesday Night
Showers likely and possibly a thunderstorm. Mostly cloudy, with a low around 47.
Wednesday
A chance of showers. Mostly cloudy, with a high near 59.
Wednesday Night
A chance of showers. Mostly cloudy, with a low around 41.
Thursday
A chance of showers. Mostly cloudy, with a high near 52.
Basemap Options
Click map to change the forecast location
Loading map...
Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Grayslake IL
 42.35°N 88.02°W
Last Update:
11:41 pm CDT Mar 26, 2026
Forecast Valid:
11pm CDT Mar 26, 2026-6pm CDT Apr 2, 2026
 
Forecast Discussion
 
Get as KML Get as XML

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