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.

Overcast

38°F

3°C

Humidity 89%
Wind Speed S 9 mph
Barometer 30.12 in (1020.6 mb)
Dewpoint 35°F (2°C)
Visibility 10.00 mi
Wind Chill32°F (0°C)
Last update 10 Jan 1:51 am CST
Extended Forecast for

McHenry IL

  • Overnight

    Overnight: A chance of rain between 3am and 5am, then rain and snow likely. Cloudy, with a steady temperature around 36. South southeast wind around 5 mph. Chance of precipitation is 70%. Little or no snow accumulation expected.

    Low: 36 °F

    Rain/Snow
    Likely

  • Saturday

    Saturday: Rain and snow before 1pm, then scattered snow after 4pm. Temperature falling to around 32 by 5pm. South wind 5 to 15 mph becoming west northwest in the morning. Winds could gust as high as 25 mph. Chance of precipitation is 100%. New snow accumulation of around an inch possible.

    High: 35 °F⇓

    Rain/Snow
    then Chance
    Snow

  • Saturday Night

    Saturday Night: Scattered snow showers. Mostly cloudy, with a low around 22. Blustery, with a west northwest wind 15 to 20 mph, with gusts as high as 30 mph. Chance of precipitation is 40%.

    Low: 22 °F

    Scattered
    Snow Showers
    and Blustery

  • Sunday

    Sunday: A chance of flurries before 9am. Partly sunny, with a high near 32. Breezy, with a northwest wind 10 to 20 mph, with gusts as high as 35 mph.

    High: 32 °F

    Chance
    Flurries and
    Breezy then
    Mostly Sunny

  • Sunday Night

    Sunday Night: Partly cloudy, with a low around 22. Southwest wind 5 to 15 mph.

    Low: 22 °F

    Partly Cloudy

  • Monday

    Monday: Sunny, with a high near 42.

    High: 42 °F

    Sunny

  • Monday Night

    Monday Night: Mostly cloudy, with a low around 32.

    Low: 32 °F

    Mostly Cloudy

  • Tuesday

    Tuesday: A chance of showers. Partly sunny, with a high near 48.

    High: 48 °F

    Chance
    Showers

  • Tuesday Night

    Tuesday Night: A chance of snow showers after 3am. Mostly cloudy, with a low around 29.

    Low: 29 °F

    Mostly Cloudy
    then Chance
    Snow Showers

Detailed Forecast

Overnight
A chance of rain between 3am and 5am, then rain and snow likely. Cloudy, with a steady temperature around 36. South southeast wind around 5 mph. Chance of precipitation is 70%. Little or no snow accumulation expected.
Saturday
Rain and snow before 1pm, then scattered snow after 4pm. Temperature falling to around 32 by 5pm. South wind 5 to 15 mph becoming west northwest in the morning. Winds could gust as high as 25 mph. Chance of precipitation is 100%. New snow accumulation of around an inch possible.
Saturday Night
Scattered snow showers. Mostly cloudy, with a low around 22. Blustery, with a west northwest wind 15 to 20 mph, with gusts as high as 30 mph. Chance of precipitation is 40%.
Sunday
A chance of flurries before 9am. Partly sunny, with a high near 32. Breezy, with a northwest wind 10 to 20 mph, with gusts as high as 35 mph.
Sunday Night
Partly cloudy, with a low around 22. Southwest wind 5 to 15 mph.
Monday
Sunny, with a high near 42.
Monday Night
Mostly cloudy, with a low around 32.
Tuesday
A chance of showers. Partly sunny, with a high near 48.
Tuesday Night
A chance of snow showers after 3am. Mostly cloudy, with a low around 29.
Wednesday
A chance of snow showers. Mostly cloudy, with a high near 31.
Wednesday Night
Mostly cloudy, with a low around 17.
Thursday
Partly sunny, with a high near 29.
Thursday Night
A chance of snow. Mostly cloudy, with a low around 24.
Friday
A chance of snow showers. Mostly cloudy, with a high near 33.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
McHenry IL
 42.34°N 88.26°W
Last Update:
2:21 am CST Jan 10, 2026
Forecast Valid:
2am CST Jan 10, 2026-6pm CST Jan 16, 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