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.

Overcast

34°F

1°C

Humidity 79%
Wind Speed NE 16 G 29 mph
Barometer 30.24 in (1025.0 mb)
Dewpoint 28°F (-2°C)
Visibility 10.00 mi
Wind Chill24°F (-4°C)
Last update 1 Apr 9:51 am CDT
Extended Forecast for

Grayslake IL

  • Today

    Today: Mostly cloudy, with a high near 38. Northeast wind around 15 mph, with gusts as high as 30 mph.

    High: 38 °F

    Mostly Cloudy

  • Tonight

    Tonight: Rain likely, then rain and possibly a thunderstorm after 1am. Low around 36. East wind around 15 mph, with gusts as high as 30 mph. Chance of precipitation is 100%. New rainfall amounts between a quarter and half of an inch possible.

    Low: 36 °F

    Rain Likely
    then Rain

  • Thursday

    Thursday: Showers and possibly a thunderstorm. High near 69. Breezy, with an east southeast wind 15 to 25 mph becoming south in the afternoon. Winds could gust as high as 40 mph. Chance of precipitation is 100%. New rainfall amounts between a half and three quarters of an inch possible.

    High: 69 °F

    Showers and
    Breezy

  • Thursday Night

    Thursday Night: Showers likely and possibly a thunderstorm before 1am. Mostly cloudy, with a low around 46. Breezy, with a west southwest wind 15 to 25 mph, with gusts as high as 35 mph. Chance of precipitation is 70%.

    Low: 46 °F

    Showers
    Likely and
    Breezy

  • Friday

    Friday: A 20 percent chance of showers after 1pm. Mostly sunny, with a high near 63. West southwest wind 5 to 10 mph becoming east in the afternoon. Winds could gust as high as 15 mph.

    High: 63 °F

    Mostly Sunny
    then Slight
    Chance
    Showers

  • Friday Night

    Friday Night: Showers and possibly a thunderstorm. Low around 45. Chance of precipitation is 90%.

    Low: 45 °F

    Showers

  • Saturday

    Saturday: Showers likely and possibly a thunderstorm before 1pm, then a chance of showers. Mostly cloudy, with a high near 62. Chance of precipitation is 60%.

    High: 62 °F

    Showers
    Likely

  • Saturday Night

    Saturday Night: Mostly cloudy, with a low around 33.

    Low: 33 °F

    Mostly Cloudy

  • Sunday

    Sunday: Partly sunny, with a high near 48. Breezy.

    High: 48 °F

    Partly Sunny
    and Breezy

Detailed Forecast

Today
Mostly cloudy, with a high near 38. Northeast wind around 15 mph, with gusts as high as 30 mph.
Tonight
Rain likely, then rain and possibly a thunderstorm after 1am. Low around 36. East wind around 15 mph, with gusts as high as 30 mph. Chance of precipitation is 100%. New rainfall amounts between a quarter and half of an inch possible.
Thursday
Showers and possibly a thunderstorm. High near 69. Breezy, with an east southeast wind 15 to 25 mph becoming south in the afternoon. Winds could gust as high as 40 mph. Chance of precipitation is 100%. New rainfall amounts between a half and three quarters of an inch possible.
Thursday Night
Showers likely and possibly a thunderstorm before 1am. Mostly cloudy, with a low around 46. Breezy, with a west southwest wind 15 to 25 mph, with gusts as high as 35 mph. Chance of precipitation is 70%.
Friday
A 20 percent chance of showers after 1pm. Mostly sunny, with a high near 63. West southwest wind 5 to 10 mph becoming east in the afternoon. Winds could gust as high as 15 mph.
Friday Night
Showers and possibly a thunderstorm. Low around 45. Chance of precipitation is 90%.
Saturday
Showers likely and possibly a thunderstorm before 1pm, then a chance of showers. Mostly cloudy, with a high near 62. Chance of precipitation is 60%.
Saturday Night
Mostly cloudy, with a low around 33.
Sunday
Partly sunny, with a high near 48. Breezy.
Sunday Night
Mostly clear, with a low around 31.
Monday
A chance of showers. Partly sunny, with a high near 53.
Monday Night
A chance of showers. Mostly cloudy, with a low around 32.
Tuesday
Partly sunny, with a high near 44.
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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:
9:01 am CDT Apr 1, 2026
Forecast Valid:
10am CDT Apr 1, 2026-6pm CDT Apr 7, 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