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.

Partly Cloudy

72°F

22°C

Humidity 73%
Wind Speed SW 10 mph
Barometer 29.87 in (1010.6 mb)
Dewpoint 63°F (17°C)
Visibility 10.00 mi
Last update 13 Apr 2:51 pm CDT
Extended Forecast for

Grayslake IL

  • This Afternoon

    This Afternoon: Scattered showers and thunderstorms. Partly sunny, with a high near 78. South southwest wind around 15 mph, with gusts as high as 25 mph. Chance of precipitation is 40%.

    High: 78 °F

    Scattered
    T-storms

  • Tonight

    Tonight: Scattered showers and thunderstorms, mainly before 5am. Mostly cloudy, with a low around 64. South wind around 15 mph, with gusts as high as 25 mph. Chance of precipitation is 50%.

    Low: 64 °F

    Scattered
    T-storms

  • Tuesday

    Tuesday: A slight chance of showers between 2pm and 4pm, then a chance of showers and thunderstorms after 4pm. Mostly sunny, with a high near 81. Southwest wind around 15 mph, with gusts as high as 25 mph. Chance of precipitation is 30%.

    High: 81 °F

    Partly Sunny
    then Chance
    T-storms

  • Tuesday Night

    Tuesday Night: Showers and possibly a thunderstorm. Low around 58. Southwest wind around 10 mph, with gusts as high as 20 mph. Chance of precipitation is 90%.

    Low: 58 °F

    T-storms then
    Showers

  • Wednesday

    Wednesday: Showers, with thunderstorms also possible after 4pm. High near 69. South southwest wind 10 to 15 mph. Chance of precipitation is 80%.

    High: 69 °F

    Showers

  • Wednesday Night

    Wednesday Night: Showers and possibly a thunderstorm before 1am, then a chance of showers and thunderstorms between 1am and 4am, then a chance of showers after 4am. Low around 57. Chance of precipitation is 80%.

    Low: 57 °F

    Showers

  • Thursday

    Thursday: A chance of showers and thunderstorms before 10am, then a chance of showers between 10am and 1pm, then a chance of showers and thunderstorms after 1pm. Partly sunny, with a high near 72. Chance of precipitation is 50%.

    High: 72 °F

    Chance
    Showers

  • Thursday Night

    Thursday Night: Partly cloudy, with a low around 50.

    Low: 50 °F

    Partly Cloudy

  • Friday

    Friday: Partly sunny, with a high near 76.

    High: 76 °F

    Partly Sunny

Detailed Forecast

This Afternoon
Scattered showers and thunderstorms. Partly sunny, with a high near 78. South southwest wind around 15 mph, with gusts as high as 25 mph. Chance of precipitation is 40%.
Tonight
Scattered showers and thunderstorms, mainly before 5am. Mostly cloudy, with a low around 64. South wind around 15 mph, with gusts as high as 25 mph. Chance of precipitation is 50%.
Tuesday
A slight chance of showers between 2pm and 4pm, then a chance of showers and thunderstorms after 4pm. Mostly sunny, with a high near 81. Southwest wind around 15 mph, with gusts as high as 25 mph. Chance of precipitation is 30%.
Tuesday Night
Showers and possibly a thunderstorm. Low around 58. Southwest wind around 10 mph, with gusts as high as 20 mph. Chance of precipitation is 90%.
Wednesday
Showers, with thunderstorms also possible after 4pm. High near 69. South southwest wind 10 to 15 mph. Chance of precipitation is 80%.
Wednesday Night
Showers and possibly a thunderstorm before 1am, then a chance of showers and thunderstorms between 1am and 4am, then a chance of showers after 4am. Low around 57. Chance of precipitation is 80%.
Thursday
A chance of showers and thunderstorms before 10am, then a chance of showers between 10am and 1pm, then a chance of showers and thunderstorms after 1pm. Partly sunny, with a high near 72. Chance of precipitation is 50%.
Thursday Night
Partly cloudy, with a low around 50.
Friday
Partly sunny, with a high near 76.
Friday Night
Showers and possibly a thunderstorm. Mostly cloudy, with a low around 55.
Saturday
Showers likely and possibly a thunderstorm. Partly sunny, with a high near 64. Breezy.
Saturday Night
Mostly cloudy, with a low around 34.
Sunday
Mostly sunny, with a high near 51.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Grayslake IL
 42.35°N 88.02°W
Last Update:
2:11 pm CDT Apr 13, 2026
Forecast Valid:
2pm CDT Apr 13, 2026-6pm CDT Apr 19, 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