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

27°F

-3°C

Humidity 81%
Wind Speed S 3 mph
Barometer 30.41 in (1031.2 mb)
Dewpoint 22°F (-6°C)
Visibility 10.00 mi
Last update 24 Mar 12:51 am CDT
Extended Forecast for

McHenry IL

  • Overnight

    Overnight: Mostly cloudy, with a low around 29. South wind around 5 mph, with gusts as high as 15 mph.

    Low: 29 °F

    Mostly Cloudy

  • Tuesday

    Tuesday: Mostly cloudy, with a high near 50. South southwest wind 5 to 10 mph, with gusts as high as 20 mph.

    High: 50 °F

    Mostly Cloudy

  • Tuesday Night

    Tuesday Night: Partly cloudy, with a low around 35. South southeast wind around 5 mph becoming calm in the evening. Winds could gust as high as 10 mph.

    Low: 35 °F

    Partly Cloudy

  • Wednesday

    Wednesday: Partly sunny, with a high near 67. South southwest wind 5 to 10 mph increasing to 10 to 15 mph in the afternoon. Winds could gust as high as 20 mph.

    High: 67 °F

    Partly Sunny

  • Wednesday Night

    Wednesday Night: Mostly cloudy, with a low around 50. South southwest wind 5 to 10 mph.

    Low: 50 °F

    Mostly Cloudy

  • Thursday

    Thursday: A 30 percent chance of showers and thunderstorms, mainly after 4pm. Partly sunny, with a high near 72.

    High: 72 °F

    Mostly Sunny
    then Chance
    T-storms

  • Thursday Night

    Thursday Night: A chance of showers and thunderstorms before 7pm, then a slight chance of showers between 7pm and 1am. Mostly cloudy, with a low around 30. Chance of precipitation is 30%.

    Low: 30 °F

    Chance
    T-storms then
    Slight Chance
    Showers

  • Friday

    Friday: Mostly sunny, with a high near 42.

    High: 42 °F

    Mostly Sunny

  • Friday Night

    Friday Night: Mostly clear, with a low around 25.

    Low: 25 °F

    Mostly Clear

Detailed Forecast

Overnight
Mostly cloudy, with a low around 29. South wind around 5 mph, with gusts as high as 15 mph.
Tuesday
Mostly cloudy, with a high near 50. South southwest wind 5 to 10 mph, with gusts as high as 20 mph.
Tuesday Night
Partly cloudy, with a low around 35. South southeast wind around 5 mph becoming calm in the evening. Winds could gust as high as 10 mph.
Wednesday
Partly sunny, with a high near 67. South southwest wind 5 to 10 mph increasing to 10 to 15 mph in the afternoon. Winds could gust as high as 20 mph.
Wednesday Night
Mostly cloudy, with a low around 50. South southwest wind 5 to 10 mph.
Thursday
A 30 percent chance of showers and thunderstorms, mainly after 4pm. Partly sunny, with a high near 72.
Thursday Night
A chance of showers and thunderstorms before 7pm, then a slight chance of showers between 7pm and 1am. Mostly cloudy, with a low around 30. Chance of precipitation is 30%.
Friday
Mostly sunny, with a high near 42.
Friday Night
Mostly clear, with a low around 25.
Saturday
Sunny, with a high near 52.
Saturday Night
Partly cloudy, with a low around 34.
Sunday
Partly sunny, with a high near 57.
Sunday Night
Partly cloudy, with a low around 39.
Monday
Mostly sunny, with a high near 65.
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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:
1:11 am CDT Mar 24, 2026
Forecast Valid:
1am CDT Mar 24, 2026-6pm CDT Mar 30, 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