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

70°F

21°C

Humidity 87%
Wind Speed NW 3 mph
Barometer 30.07 in (1017.2 mb)
Dewpoint 66°F (19°C)
Visibility 10.00 mi
Last update 20 Aug 12:51 am CDT
Extended Forecast for

McHenry IL

  • Overnight

    Overnight: A chance of sprinkles. Patchy fog after 3am. Otherwise, partly cloudy, with a low around 64. Calm wind.

    Low: 64 °F

    Chance
    Sprinkles and
    Patchy Fog

  • Wednesday

    Wednesday: A 20 percent chance of sprinkles with a slight chance of showers before 1pm. Patchy fog before 9am. Otherwise, partly sunny, with a high near 79. North northeast wind 5 to 10 mph, with gusts as high as 15 mph.

    High: 79 °F

    Slight Chance
    Showers and
    Patchy Fog

  • Wednesday Night

    Wednesday Night: Mostly clear, with a low around 61. North northeast wind 5 to 10 mph, with gusts as high as 15 mph.

    Low: 61 °F

    Mostly Clear

  • Thursday

    Thursday: Sunny, with a high near 80. Northeast wind 5 to 10 mph, with gusts as high as 15 mph.

    High: 80 °F

    Sunny

  • Thursday Night

    Thursday Night: Mostly clear, with a low around 59. Northeast wind around 5 mph becoming calm in the evening.

    Low: 59 °F

    Mostly Clear

  • Friday

    Friday: Sunny, with a high near 82.

    High: 82 °F

    Sunny

  • Friday Night

    Friday Night: A 20 percent chance of showers and thunderstorms after 1am. Mostly cloudy, with a low around 63.

    Low: 63 °F

    Partly Cloudy
    then Slight
    Chance
    T-storms

  • Saturday

    Saturday: Sunny, with a high near 78.

    High: 78 °F

    Sunny

  • Saturday Night

    Saturday Night: Mostly clear, with a low around 55.

    Low: 55 °F

    Mostly Clear

Detailed Forecast

Overnight
A chance of sprinkles. Patchy fog after 3am. Otherwise, partly cloudy, with a low around 64. Calm wind.
Wednesday
A 20 percent chance of sprinkles with a slight chance of showers before 1pm. Patchy fog before 9am. Otherwise, partly sunny, with a high near 79. North northeast wind 5 to 10 mph, with gusts as high as 15 mph.
Wednesday Night
Mostly clear, with a low around 61. North northeast wind 5 to 10 mph, with gusts as high as 15 mph.
Thursday
Sunny, with a high near 80. Northeast wind 5 to 10 mph, with gusts as high as 15 mph.
Thursday Night
Mostly clear, with a low around 59. Northeast wind around 5 mph becoming calm in the evening.
Friday
Sunny, with a high near 82.
Friday Night
A 20 percent chance of showers and thunderstorms after 1am. Mostly cloudy, with a low around 63.
Saturday
Sunny, with a high near 78.
Saturday Night
Mostly clear, with a low around 55.
Sunday
Sunny, with a high near 71.
Sunday Night
Mostly clear, with a low around 51.
Monday
Sunny, with a high near 70.
Monday Night
Mostly clear, with a low around 50.
Tuesday
Sunny, with a high near 72.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
McHenry IL
 42.36°N 88.26°W
Last Update:
12:56 am CDT Aug 20, 2025
Forecast Valid:
1am CDT Aug 20, 2025-6pm CDT Aug 26, 2025
 
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