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

62°F

17°C

Humidity 96%
Wind Speed Calm
Barometer 29.93 in (1012.7 mb)
Dewpoint 61°F (16°C)
Visibility 10.00 mi
Last update 14 Oct 2:51 am CDT
Extended Forecast for

Grayslake IL

  • Overnight

    Overnight: A 40 percent chance of showers and thunderstorms before 4am. Cloudy, with a low around 59. North northeast wind around 5 mph.

    Low: 59 °F

    Chance
    T-storms

  • Wednesday

    Wednesday: A slight chance of showers between 10am and 1pm. Mostly cloudy, with a high near 62. Northeast wind 5 to 10 mph. Chance of precipitation is 20%.

    High: 62 °F

    Slight Chance
    Showers

  • Wednesday Night

    Wednesday Night: Mostly cloudy, with a low around 54. Northeast wind around 10 mph, with gusts as high as 15 mph.

    Low: 54 °F

    Mostly Cloudy

  • Thursday

    Thursday: Rain likely, then rain and possibly a thunderstorm after 1pm. High near 58. East southeast wind around 10 mph, with gusts as high as 15 mph. Chance of precipitation is 100%.

    High: 58 °F

    Rain Likely
    then Rain

  • Thursday Night

    Thursday Night: Rain and possibly a thunderstorm before 1am, then a slight chance of rain. Low around 48. North wind 5 to 10 mph becoming northwest 10 to 15 mph after midnight. Winds could gust as high as 30 mph. Chance of precipitation is 80%.

    Low: 48 °F

    Rain

  • Friday

    Friday: A 30 percent chance of rain before 1pm. Partly sunny, with a high near 54. Breezy.

    High: 54 °F

    Chance Rain
    and Breezy

  • Friday Night

    Friday Night: Areas of frost after 3am. Otherwise, mostly clear, with a low around 34.

    Low: 34 °F

    Partly Cloudy
    then Areas
    Frost

  • Saturday

    Saturday: Areas of frost before 9am. Otherwise, sunny, with a high near 56.

    High: 56 °F

    Areas Frost
    then Sunny

  • Saturday Night

    Saturday Night: Mostly clear, with a low around 39.

    Low: 39 °F

    Mostly Clear

Detailed Forecast

Overnight
A 40 percent chance of showers and thunderstorms before 4am. Cloudy, with a low around 59. North northeast wind around 5 mph.
Wednesday
A slight chance of showers between 10am and 1pm. Mostly cloudy, with a high near 62. Northeast wind 5 to 10 mph. Chance of precipitation is 20%.
Wednesday Night
Mostly cloudy, with a low around 54. Northeast wind around 10 mph, with gusts as high as 15 mph.
Thursday
Rain likely, then rain and possibly a thunderstorm after 1pm. High near 58. East southeast wind around 10 mph, with gusts as high as 15 mph. Chance of precipitation is 100%.
Thursday Night
Rain and possibly a thunderstorm before 1am, then a slight chance of rain. Low around 48. North wind 5 to 10 mph becoming northwest 10 to 15 mph after midnight. Winds could gust as high as 30 mph. Chance of precipitation is 80%.
Friday
A 30 percent chance of rain before 1pm. Partly sunny, with a high near 54. Breezy.
Friday Night
Areas of frost after 3am. Otherwise, mostly clear, with a low around 34.
Saturday
Areas of frost before 9am. Otherwise, sunny, with a high near 56.
Saturday Night
Mostly clear, with a low around 39.
Sunday
Sunny, with a high near 64.
Sunday Night
Partly cloudy, with a low around 45.
Monday
Partly sunny, with a high near 66.
Monday Night
Partly cloudy, with a low around 45.
Tuesday
Mostly sunny, with a high near 69.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Grayslake IL
 42.35°N 88.05°W
Last Update:
2:41 am CDT Oct 14, 2026
Forecast Valid:
3am CDT Oct 14, 2026-6pm CDT Oct 20, 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