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.

A Few Clouds

55°F

13°C

Humidity 74%
Wind Speed NW 6 mph
Barometer 30.15 in (1020.2 mb)
Dewpoint 47°F (8°C)
Visibility 10.00 mi
Wind Chill54°F (12°C)
Last update 20 May 12:51 am CDT
Extended Forecast for

Grayslake IL

  • Overnight

    Overnight: Partly cloudy, with a low around 49. North northwest wind around 10 mph, with gusts as high as 15 mph.

    Low: 49 °F

    Partly Cloudy

  • Wednesday

    Wednesday: Mostly sunny, with a high near 57. Northeast wind 10 to 15 mph.

    High: 57 °F

    Mostly Sunny

  • Wednesday Night

    Wednesday Night: Partly cloudy, with a low around 41. Northeast wind 10 to 15 mph, with gusts as high as 20 mph.

    Low: 41 °F

    Partly Cloudy

  • Thursday

    Thursday: Partly sunny, with a high near 58. East northeast wind around 15 mph, with gusts as high as 20 mph.

    High: 58 °F

    Partly Sunny

  • Thursday Night

    Thursday Night: Mostly cloudy, with a low around 46. Northeast wind 10 to 15 mph, with gusts as high as 20 mph.

    Low: 46 °F

    Mostly Cloudy

  • Friday

    Friday: A 40 percent chance of showers after 1pm. Mostly cloudy, with a high near 61.

    High: 61 °F

    Mostly Cloudy
    then Chance
    Showers

  • Friday Night

    Friday Night: Showers likely before 10pm, then showers likely and possibly a thunderstorm between 10pm and 1am, then showers likely after 1am. Cloudy, with a low around 51. Chance of precipitation is 70%.

    Low: 51 °F

    Showers
    Likely

  • Saturday

    Saturday: Mostly cloudy, with a high near 69.

    High: 69 °F

    Mostly Cloudy

  • Saturday Night

    Saturday Night: Mostly cloudy, with a low around 53.

    Low: 53 °F

    Mostly Cloudy

Detailed Forecast

Overnight
Partly cloudy, with a low around 49. North northwest wind around 10 mph, with gusts as high as 15 mph.
Wednesday
Mostly sunny, with a high near 57. Northeast wind 10 to 15 mph.
Wednesday Night
Partly cloudy, with a low around 41. Northeast wind 10 to 15 mph, with gusts as high as 20 mph.
Thursday
Partly sunny, with a high near 58. East northeast wind around 15 mph, with gusts as high as 20 mph.
Thursday Night
Mostly cloudy, with a low around 46. Northeast wind 10 to 15 mph, with gusts as high as 20 mph.
Friday
A 40 percent chance of showers after 1pm. Mostly cloudy, with a high near 61.
Friday Night
Showers likely before 10pm, then showers likely and possibly a thunderstorm between 10pm and 1am, then showers likely after 1am. Cloudy, with a low around 51. Chance of precipitation is 70%.
Saturday
Mostly cloudy, with a high near 69.
Saturday Night
Mostly cloudy, with a low around 53.
Sunday
Partly sunny, with a high near 74.
Sunday Night
Partly cloudy, with a low around 54.
Memorial Day
Partly sunny, with a high near 77.
Monday Night
Partly cloudy, with a low around 57.
Tuesday
Partly sunny, with a high near 79.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Grayslake IL
 42.37°N 88.05°W
Last Update:
1:30 am CDT May 20, 2026
Forecast Valid:
1am CDT May 20, 2026-6pm CDT May 26, 2026
 
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