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

49°F

9°C

Humidity 86%
Wind Speed SW 3 mph
Barometer 30.12 in (1019.6 mb)
Dewpoint 45°F (7°C)
Visibility 10.00 mi
Last update 9 Oct 12:51 am CDT
Extended Forecast for

McHenry IL

  • Overnight

    Overnight: Partly cloudy, with a low around 49. Calm wind.

    Low: 49 °F

    Partly Cloudy

  • Friday

    Friday: Scattered showers, with thunderstorms also possible after 4pm. Mostly cloudy, with a high near 70. Light and variable wind becoming south southeast 5 to 10 mph in the morning. Chance of precipitation is 50%.

    High: 70 °F

    Isolated
    Showers then
    Scattered
    Showers

  • Friday Night

    Friday Night: Mostly cloudy during the early evening, then becoming clear, with a low around 58. Southeast wind around 10 mph, with gusts as high as 15 mph.

    Low: 58 °F

    Clear

  • Saturday

    Saturday: Sunny, with a high near 80. South wind 10 to 15 mph, with gusts as high as 25 mph.

    High: 80 °F

    Sunny

  • Saturday Night

    Saturday Night: Mostly cloudy, with a low around 58. South wind 5 to 10 mph, with gusts as high as 20 mph.

    Low: 58 °F

    Mostly Cloudy

  • Sunday

    Sunday: Mostly sunny, with a high near 73.

    High: 73 °F

    Mostly Sunny

  • Sunday Night

    Sunday Night: Partly cloudy, with a low around 55.

    Low: 55 °F

    Partly Cloudy

  • Columbus Day

    Columbus Day: Mostly sunny, with a high near 78.

    High: 78 °F

    Mostly Sunny

  • Monday Night

    Monday Night: A chance of showers before 1am. Partly cloudy, with a low around 57.

    Low: 57 °F

    Chance
    Showers

Detailed Forecast

Overnight
Partly cloudy, with a low around 49. Calm wind.
Friday
Scattered showers, with thunderstorms also possible after 4pm. Mostly cloudy, with a high near 70. Light and variable wind becoming south southeast 5 to 10 mph in the morning. Chance of precipitation is 50%.
Friday Night
Mostly cloudy during the early evening, then becoming clear, with a low around 58. Southeast wind around 10 mph, with gusts as high as 15 mph.
Saturday
Sunny, with a high near 80. South wind 10 to 15 mph, with gusts as high as 25 mph.
Saturday Night
Mostly cloudy, with a low around 58. South wind 5 to 10 mph, with gusts as high as 20 mph.
Sunday
Mostly sunny, with a high near 73.
Sunday Night
Partly cloudy, with a low around 55.
Columbus Day
Mostly sunny, with a high near 78.
Monday Night
A chance of showers before 1am. Partly cloudy, with a low around 57.
Tuesday
Partly sunny, with a high near 69.
Tuesday Night
Mostly cloudy, with a low around 48.
Wednesday
A chance of showers. Mostly cloudy, with a high near 66.
Wednesday Night
A chance of showers. Mostly cloudy, with a low around 52.
Thursday
A chance of showers. Partly sunny, with a high near 69.
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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:
10:51 pm CDT Oct 8, 2026
Forecast Valid:
1am CDT Oct 9, 2026-6pm CDT Oct 15, 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