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

15°F

-9°C

Humidity 64%
Wind Speed NW 12 G 24 mph
Barometer 29.99 in (1017.6 mb)
Dewpoint 5°F (-15°C)
Visibility 10.00 mi
Wind Chill1°F (-17°C)
Last update 15 Jan 3:51 am CST
Extended Forecast for

Grayslake IL

  • Overnight

    Overnight: Mostly cloudy, with a low around 12. Wind chill values as low as -1. North northwest wind 10 to 15 mph, with gusts as high as 25 mph.

    Low: 12 °F

    Mostly Cloudy

  • Thursday

    Thursday: Mostly sunny, with a high near 24. Wind chill values as low as -1. North northwest wind 5 to 10 mph becoming south southwest in the afternoon. Winds could gust as high as 25 mph.

    High: 24 °F

    Mostly Sunny

  • Thursday Night

    Thursday Night: Snow. Temperature rising to around 27 by 4am. South southwest wind 10 to 15 mph, with gusts as high as 30 mph. Chance of precipitation is 90%. New snow accumulation of around an inch possible.

    Low: 23 °F⇑

    Snow Likely
    then Snow

  • Friday

    Friday: Snow showers likely, mainly before noon. Mostly cloudy, with a high near 36. West wind around 15 mph, with gusts as high as 30 mph. Chance of precipitation is 60%. New snow accumulation of less than a half inch possible.

    High: 36 °F

    Snow Showers
    Likely

  • Friday Night

    Friday Night: A 50 percent chance of snow. Mostly cloudy, with a low around 13. West wind around 15 mph, with gusts as high as 25 mph.

    Low: 13 °F

    Chance Snow

  • Saturday

    Saturday: A 40 percent chance of snow. Mostly cloudy, with a high near 18.

    High: 18 °F

    Chance Snow

  • Saturday Night

    Saturday Night: A 20 percent chance of snow. Mostly cloudy, with a low around 6.

    Low: 6 °F

    Slight Chance
    Snow

  • Sunday

    Sunday: Mostly cloudy, with a high near 17.

    High: 17 °F

    Mostly Cloudy

  • Sunday Night

    Sunday Night: Mostly cloudy, with a low around 5.

    Low: 5 °F

    Mostly Cloudy

Detailed Forecast

Overnight
Mostly cloudy, with a low around 12. Wind chill values as low as -1. North northwest wind 10 to 15 mph, with gusts as high as 25 mph.
Thursday
Mostly sunny, with a high near 24. Wind chill values as low as -1. North northwest wind 5 to 10 mph becoming south southwest in the afternoon. Winds could gust as high as 25 mph.
Thursday Night
Snow. Temperature rising to around 27 by 4am. South southwest wind 10 to 15 mph, with gusts as high as 30 mph. Chance of precipitation is 90%. New snow accumulation of around an inch possible.
Friday
Snow showers likely, mainly before noon. Mostly cloudy, with a high near 36. West wind around 15 mph, with gusts as high as 30 mph. Chance of precipitation is 60%. New snow accumulation of less than a half inch possible.
Friday Night
A 50 percent chance of snow. Mostly cloudy, with a low around 13. West wind around 15 mph, with gusts as high as 25 mph.
Saturday
A 40 percent chance of snow. Mostly cloudy, with a high near 18.
Saturday Night
A 20 percent chance of snow. Mostly cloudy, with a low around 6.
Sunday
Mostly cloudy, with a high near 17.
Sunday Night
Mostly cloudy, with a low around 5.
M.L.King Day
Partly sunny, with a high near 12. Blustery.
Monday Night
Partly cloudy, with a low around 0.
Tuesday
Mostly sunny, with a high near 16.
Tuesday Night
Mostly cloudy, with a low around 8.
Wednesday
Partly sunny, with a high near 23.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Grayslake IL
 42.33°N 88.03°W
Last Update:
3:06 am CST Jan 15, 2026
Forecast Valid:
3am CST Jan 15, 2026-6pm CST Jan 21, 2026
 
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Additional Resources

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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