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

57°F

14°C

Humidity 39%
Wind Speed NW 7 mph
Barometer 29.86 in (1011.7 mb)
Dewpoint 32°F (0°C)
Visibility 10.00 mi
Last update 15 Feb 1:51 pm CST
Extended Forecast for

McHenry IL

  • This Afternoon

    This Afternoon: Sunny, with a high near 56. West northwest wind 5 to 10 mph.

    High: 56 °F

    Sunny

  • Tonight

    Tonight: Increasing clouds, with a low around 35. Calm wind becoming south southwest around 5 mph after midnight. Winds could gust as high as 10 mph.

    Low: 35 °F

    Increasing
    Clouds

  • Washington's Birthday

    Washington's Birthday: Mostly sunny, with a high near 62. West southwest wind 10 to 15 mph, with gusts as high as 25 mph.

    High: 62 °F

    Mostly Sunny

  • Monday Night

    Monday Night: Patchy fog after midnight. Otherwise, mostly cloudy, with a low around 37. West southwest wind around 5 mph becoming east southeast after midnight.

    Low: 37 °F

    Partly Cloudy
    then Patchy
    Fog

  • Tuesday

    Tuesday: Patchy fog before 9am. Otherwise, mostly cloudy, with a high near 54. East southeast wind 5 to 15 mph, with gusts as high as 20 mph.

    High: 54 °F

    Patchy Fog
    then Mostly
    Cloudy

  • Tuesday Night

    Tuesday Night: Showers likely, with thunderstorms also possible after 3am. Mostly cloudy, with a low around 48. Chance of precipitation is 70%.

    Low: 48 °F

    Showers
    Likely

  • Wednesday

    Wednesday: A 30 percent chance of showers before noon. Mostly sunny, with a high near 63. Breezy.

    High: 63 °F

    Breezy.
    Chance
    Showers then
    Sunny

  • Wednesday Night

    Wednesday Night: Partly cloudy, with a low around 35.

    Low: 35 °F

    Partly Cloudy

  • Thursday

    Thursday: A chance of rain after noon. Partly sunny, with a high near 54.

    High: 54 °F

    Mostly Sunny
    then Chance
    Rain

Detailed Forecast

This Afternoon
Sunny, with a high near 56. West northwest wind 5 to 10 mph.
Tonight
Increasing clouds, with a low around 35. Calm wind becoming south southwest around 5 mph after midnight. Winds could gust as high as 10 mph.
Washington's Birthday
Mostly sunny, with a high near 62. West southwest wind 10 to 15 mph, with gusts as high as 25 mph.
Monday Night
Patchy fog after midnight. Otherwise, mostly cloudy, with a low around 37. West southwest wind around 5 mph becoming east southeast after midnight.
Tuesday
Patchy fog before 9am. Otherwise, mostly cloudy, with a high near 54. East southeast wind 5 to 15 mph, with gusts as high as 20 mph.
Tuesday Night
Showers likely, with thunderstorms also possible after 3am. Mostly cloudy, with a low around 48. Chance of precipitation is 70%.
Wednesday
A 30 percent chance of showers before noon. Mostly sunny, with a high near 63. Breezy.
Wednesday Night
Partly cloudy, with a low around 35.
Thursday
A chance of rain after noon. Partly sunny, with a high near 54.
Thursday Night
A chance of rain. Mostly cloudy, with a low around 32.
Friday
Mostly sunny, with a high near 42.
Friday Night
Partly cloudy, with a low around 24.
Saturday
Mostly sunny, with a high near 38.
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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:
1:41 pm CST Feb 15, 2026
Forecast Valid:
2pm CST Feb 15, 2026-6pm CST Feb 21, 2026
 
Forecast Discussion
 
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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