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

41°F

5°C

Humidity 89%
Wind Speed Calm
Barometer 30.26 in (1024.7 mb)
Dewpoint 38°F (3°C)
Visibility 10.00 mi
Last update 30 Oct 12:51 am CDT
Extended Forecast for

Grayslake IL

  • Overnight

    Overnight: Clear, with a low around 40. Calm wind.

    Low: 40 °F

    Clear

  • Friday

    Friday: Partly sunny, with a high near 58. North wind around 5 mph becoming east in the afternoon.

    High: 58 °F

    Partly Sunny

  • Friday Night

    Friday Night: A 40 percent chance of showers, mainly after 1am. Cloudy, with a low around 47. East wind around 5 mph, with gusts as high as 10 mph.

    Low: 47 °F

    Chance
    Showers

  • Saturday

    Saturday: Showers likely, mainly before 1pm. Cloudy, with a high near 60. Southeast wind 5 to 10 mph. Chance of precipitation is 70%.

    High: 60 °F

    Showers
    Likely

  • Saturday Night

    Saturday Night: A 20 percent chance of showers before 10pm. Cloudy, with a low around 47. Southeast wind around 5 mph becoming calm in the evening.

    Low: 47 °F

    Slight Chance
    Showers then
    Cloudy

  • Sunday

    Sunday: A 20 percent chance of showers after 1pm. Mostly cloudy, with a high near 66.

    High: 66 °F

    Mostly Cloudy
    then Slight
    Chance
    Showers

  • Sunday Night

    Sunday Night: A 20 percent chance of showers. Mostly cloudy, with a low around 51.

    Low: 51 °F

    Slight Chance
    Showers

  • Monday

    Monday: A chance of showers. Mostly cloudy, with a high near 65.

    High: 65 °F

    Chance
    Showers

  • Monday Night

    Monday Night: Showers likely. Mostly cloudy, with a low around 56.

    Low: 56 °F

    Showers
    Likely

Detailed Forecast

Overnight
Clear, with a low around 40. Calm wind.
Friday
Partly sunny, with a high near 58. North wind around 5 mph becoming east in the afternoon.
Friday Night
A 40 percent chance of showers, mainly after 1am. Cloudy, with a low around 47. East wind around 5 mph, with gusts as high as 10 mph.
Saturday
Showers likely, mainly before 1pm. Cloudy, with a high near 60. Southeast wind 5 to 10 mph. Chance of precipitation is 70%.
Saturday Night
A 20 percent chance of showers before 10pm. Cloudy, with a low around 47. Southeast wind around 5 mph becoming calm in the evening.
Sunday
A 20 percent chance of showers after 1pm. Mostly cloudy, with a high near 66.
Sunday Night
A 20 percent chance of showers. Mostly cloudy, with a low around 51.
Monday
A chance of showers. Mostly cloudy, with a high near 65.
Monday Night
Showers likely. Mostly cloudy, with a low around 56.
Tuesday
Showers likely. Mostly cloudy, with a high near 70.
Tuesday Night
Showers likely. Mostly cloudy, with a low around 55.
Wednesday
Showers likely. Mostly cloudy, with a high near 67.
Wednesday Night
A chance of showers. Mostly cloudy, with a low around 49.
Thursday
A chance of showers. Mostly cloudy, with a high near 62.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Grayslake IL
 42.37°N 88.05°W
Last Update:
9:31 pm CDT Oct 29, 2026
Forecast Valid:
12am CDT Oct 30, 2026-6pm CST Nov 5, 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