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.

Mostly Cloudy

46°F

8°C

Humidity 34%
Wind Speed SW 8 mph
Barometer 30.29 in (1026.8 mb)
Dewpoint 19°F (-7°C)
Visibility 10.00 mi
Wind Chill42°F (6°C)
Last update 24 Mar 1:51 pm CDT
Extended Forecast for

McHenry IL

  • This Afternoon

    This Afternoon: Mostly cloudy, with a high near 50. South southwest wind around 10 mph.

    High: 50 °F

    Mostly Cloudy

  • Tonight

    Tonight: Mostly cloudy, with a low around 35. Southeast wind around 5 mph, with gusts as high as 10 mph.

    Low: 35 °F

    Mostly Cloudy

  • Wednesday

    Wednesday: Partly sunny, with a high near 68. South southwest wind 5 to 10 mph increasing to 10 to 15 mph in the afternoon. Winds could gust as high as 25 mph.

    High: 68 °F

    Partly Sunny

  • Wednesday Night

    Wednesday Night: Mostly cloudy, with a low around 51. South southwest wind 5 to 10 mph, with gusts as high as 15 mph.

    Low: 51 °F

    Mostly Cloudy

  • Thursday

    Thursday: A 50 percent chance of showers after 1pm. Partly sunny, with a high near 74. South southwest wind 5 to 15 mph becoming north in the afternoon. Winds could gust as high as 20 mph.

    High: 74 °F

    Mostly Sunny
    then Chance
    Showers

  • Thursday Night

    Thursday Night: A 20 percent chance of showers before 1am. Mostly cloudy, with a low around 29.

    Low: 29 °F

    Slight Chance
    Showers

  • Friday

    Friday: Mostly sunny, with a high near 43.

    High: 43 °F

    Mostly Sunny

  • Friday Night

    Friday Night: Mostly clear, with a low around 26.

    Low: 26 °F

    Mostly Clear

  • Saturday

    Saturday: Sunny, with a high near 52.

    High: 52 °F

    Sunny

Detailed Forecast

This Afternoon
Mostly cloudy, with a high near 50. South southwest wind around 10 mph.
Tonight
Mostly cloudy, with a low around 35. Southeast wind around 5 mph, with gusts as high as 10 mph.
Wednesday
Partly sunny, with a high near 68. South southwest wind 5 to 10 mph increasing to 10 to 15 mph in the afternoon. Winds could gust as high as 25 mph.
Wednesday Night
Mostly cloudy, with a low around 51. South southwest wind 5 to 10 mph, with gusts as high as 15 mph.
Thursday
A 50 percent chance of showers after 1pm. Partly sunny, with a high near 74. South southwest wind 5 to 15 mph becoming north in the afternoon. Winds could gust as high as 20 mph.
Thursday Night
A 20 percent chance of showers before 1am. Mostly cloudy, with a low around 29.
Friday
Mostly sunny, with a high near 43.
Friday Night
Mostly clear, with a low around 26.
Saturday
Sunny, with a high near 52.
Saturday Night
Partly cloudy, with a low around 35.
Sunday
Partly sunny, with a high near 59.
Sunday Night
Partly cloudy, with a low around 42.
Monday
Mostly sunny, with a high near 65.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
McHenry IL
 42.34°N 88.26°W
Last Update:
1:30 pm CDT Mar 24, 2026
Forecast Valid:
1pm 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