National Oceanic and Atmospheric Administration National Weather Service United States Department of Commerce

Storm Impacting the Southwest U.S.; Above Normal Temperatures Further East

A storm system will shift across the southwest U.S. through Thursday with widespread showers and isolated thunderstorms. Isolated flooding is possible. High-elevation snow is also expected in parts of Nevada and the southern Sierra Nevada range. East of this storm, above average temperatures will challenge or break daily record high temperatures this week in the southern Plains and southeast U.S. Read More >

Current conditions at

Chicago/Waukegan Regional Airport (KUGN)

Lat: 42.43°NLon: 87.86°WElev: 709ft.

Fog/Mist

39°F

4°C

Humidity 96%
Wind Speed NE 13 G 22 mph
Barometer 30.02 in (1017.3 mb)
Dewpoint 38°F (3°C)
Visibility 2.00 mi
Wind Chill31°F (-1°C)
Last update 18 Nov 4:51 pm CST
Extended Forecast for

McHenry IL

  • This Afternoon

    This Afternoon: A 20 percent chance of rain. Cloudy, with a high near 42. East northeast wind around 10 mph, with gusts as high as 20 mph.

    High: 42 °F

    Slight Chance
    Rain

  • Tonight

    Tonight: A 20 percent chance of rain before 9pm. Cloudy, with a low around 38. Northeast wind 5 to 10 mph, with gusts as high as 20 mph.

    Low: 38 °F

    Slight Chance
    Rain then
    Cloudy

  • Wednesday

    Wednesday: Mostly cloudy, with a high near 44. East southeast wind around 5 mph.

    High: 44 °F

    Mostly Cloudy

  • Wednesday Night

    Wednesday Night: Cloudy, with a low around 38. Calm wind.

    Low: 38 °F

    Cloudy

  • Thursday

    Thursday: A 20 percent chance of rain after noon. Mostly cloudy, with a high near 55. Light south wind becoming south southwest 5 to 10 mph in the morning.

    High: 55 °F

    Mostly Cloudy
    then Slight
    Chance Rain

  • Thursday Night

    Thursday Night: A 20 percent chance of rain before midnight. Mostly cloudy, with a low around 34.

    Low: 34 °F

    Slight Chance
    Rain then
    Mostly Cloudy

  • Friday

    Friday: Mostly sunny, with a high near 50.

    High: 50 °F

    Mostly Sunny

  • Friday Night

    Friday Night: Partly cloudy, with a low around 29.

    Low: 29 °F

    Partly Cloudy

  • Saturday

    Saturday: Mostly sunny, with a high near 50.

    High: 50 °F

    Mostly Sunny

Detailed Forecast

This Afternoon
A 20 percent chance of rain. Cloudy, with a high near 42. East northeast wind around 10 mph, with gusts as high as 20 mph.
Tonight
A 20 percent chance of rain before 9pm. Cloudy, with a low around 38. Northeast wind 5 to 10 mph, with gusts as high as 20 mph.
Wednesday
Mostly cloudy, with a high near 44. East southeast wind around 5 mph.
Wednesday Night
Cloudy, with a low around 38. Calm wind.
Thursday
A 20 percent chance of rain after noon. Mostly cloudy, with a high near 55. Light south wind becoming south southwest 5 to 10 mph in the morning.
Thursday Night
A 20 percent chance of rain before midnight. Mostly cloudy, with a low around 34.
Friday
Mostly sunny, with a high near 50.
Friday Night
Partly cloudy, with a low around 29.
Saturday
Mostly sunny, with a high near 50.
Saturday Night
Partly cloudy, with a low around 33.
Sunday
Sunny, with a high near 53.
Sunday Night
Partly cloudy, with a low around 36.
Monday
Mostly sunny, with a high near 54.
Monday Night
A chance of rain. Mostly cloudy, with a low around 34.
Tuesday
A chance of rain. Partly sunny, with a high near 49.
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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:
3:11 pm CST Nov 18, 2025
Forecast Valid:
4pm CST Nov 18, 2025-6pm CST Nov 25, 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