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

50°F

10°C

Humidity 100%
Wind Speed Calm
Barometer 30.02 in (1016.4 mb)
Dewpoint 50°F (10°C)
Visibility 10.00 mi
Last update 11 Oct 6:51 am CDT
Extended Forecast for

Grayslake IL

  • Today

    Today: Sunny, with a high near 77. South wind around 5 mph, with gusts as high as 10 mph.

    High: 77 °F

    Sunny

  • Tonight

    Tonight: Increasing clouds, with a low around 60. South southwest wind 5 to 10 mph.

    Low: 60 °F

    Increasing
    Clouds

  • Columbus Day

    Columbus Day: Mostly sunny, with a high near 85. Southwest wind 10 to 15 mph, with gusts as high as 25 mph.

    High: 85 °F

    Mostly Sunny

  • Monday Night

    Monday Night: A 20 percent chance of showers and thunderstorms before 1am. Mostly clear, with a low around 68. Southwest wind around 10 mph, with gusts as high as 20 mph.

    Low: 68 °F

    Slight Chance
    T-storms

  • Tuesday

    Tuesday: Sunny, with a high near 79. West southwest wind 10 to 15 mph becoming northwest in the afternoon.

    High: 79 °F

    Sunny

  • Tuesday Night

    Tuesday Night: A 30 percent chance of showers after 1am. Partly cloudy, with a low around 56.

    Low: 56 °F

    Partly Cloudy
    then Chance
    Showers

  • Wednesday

    Wednesday: A 20 percent chance of showers. Mostly cloudy, with a high near 68.

    High: 68 °F

    Slight Chance
    Showers

  • Wednesday Night

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

    Low: 53 °F

    Mostly Cloudy

  • Thursday

    Thursday: Showers likely, mainly after 1pm. Mostly cloudy, with a high near 66.

    High: 66 °F

    Showers
    Likely

Detailed Forecast

Today
Sunny, with a high near 77. South wind around 5 mph, with gusts as high as 10 mph.
Tonight
Increasing clouds, with a low around 60. South southwest wind 5 to 10 mph.
Columbus Day
Mostly sunny, with a high near 85. Southwest wind 10 to 15 mph, with gusts as high as 25 mph.
Monday Night
A 20 percent chance of showers and thunderstorms before 1am. Mostly clear, with a low around 68. Southwest wind around 10 mph, with gusts as high as 20 mph.
Tuesday
Sunny, with a high near 79. West southwest wind 10 to 15 mph becoming northwest in the afternoon.
Tuesday Night
A 30 percent chance of showers after 1am. Partly cloudy, with a low around 56.
Wednesday
A 20 percent chance of showers. Mostly cloudy, with a high near 68.
Wednesday Night
Mostly cloudy, with a low around 53.
Thursday
Showers likely, mainly after 1pm. Mostly cloudy, with a high near 66.
Thursday Night
A chance of showers. Mostly cloudy, with a low around 48.
Friday
Mostly cloudy, with a high near 60.
Friday Night
Mostly cloudy, with a low around 39.
Saturday
Mostly sunny, with a high near 55.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Grayslake IL
 42.35°N 88.02°W
Last Update:
6:11 am CDT Oct 11, 2026
Forecast Valid:
6am CDT Oct 11, 2026-6pm CDT Oct 17, 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