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.

Light Rain Fog/Mist

62°F

17°C

Humidity 93%
Wind Speed SE 10 mph
Barometer 29.60 in (1002.1 mb)
Dewpoint 60°F (16°C)
Visibility 3.00 mi
Last update 27 Apr 7:51 pm CDT
Extended Forecast for

McHenry IL

Flood Warning until further notice
Click here for hazard details and duration
Flood Warning until further notice
  •  
    Flood Warning until further notice

    NOW until further notice

    Flood Warning

  • Tonight

    Low: 48 °F

    Showers then
    Slight Chance
    T-storms

  • Tuesday

    Tuesday: Cloudy, then gradually becoming mostly sunny, with a high near 61. West wind around 15 mph, with gusts as high as 25 mph.

    High: 61 °F

    Decreasing
    Clouds

  • Tuesday Night

    Tuesday Night: A 20 percent chance of showers after 1am. Mostly cloudy, with a low around 44. Northwest wind around 5 mph, with gusts as high as 10 mph.

    Low: 44 °F

    Mostly Cloudy
    then Slight
    Chance
    Showers

  • Wednesday

    Wednesday: Partly sunny, with a high near 56. North wind 5 to 10 mph, with gusts as high as 20 mph.

    High: 56 °F

    Partly Sunny

  • Wednesday Night

    Wednesday Night: Partly cloudy, with a low around 38. North wind around 5 mph becoming calm in the evening. Winds could gust as high as 15 mph.

    Low: 38 °F

    Partly Cloudy

  • Thursday

    Thursday: Partly sunny, with a high near 56.

    High: 56 °F

    Partly Sunny

  • Thursday Night

    Thursday Night: Mostly cloudy, with a low around 36.

    Low: 36 °F

    Mostly Cloudy

  • Friday

    Friday: Partly sunny, with a high near 52.

    High: 52 °F

    Partly Sunny

Detailed Forecast

Tonight
Showers and thunderstorms, mainly before midnight. Low around 48. South southwest wind around 15 mph becoming west after midnight. Winds could gust as high as 25 mph. Chance of precipitation is 80%. New rainfall amounts between a quarter and half of an inch possible.
Tuesday
Cloudy, then gradually becoming mostly sunny, with a high near 61. West wind around 15 mph, with gusts as high as 25 mph.
Tuesday Night
A 20 percent chance of showers after 1am. Mostly cloudy, with a low around 44. Northwest wind around 5 mph, with gusts as high as 10 mph.
Wednesday
Partly sunny, with a high near 56. North wind 5 to 10 mph, with gusts as high as 20 mph.
Wednesday Night
Partly cloudy, with a low around 38. North wind around 5 mph becoming calm in the evening. Winds could gust as high as 15 mph.
Thursday
Partly sunny, with a high near 56.
Thursday Night
Mostly cloudy, with a low around 36.
Friday
Partly sunny, with a high near 52.
Friday Night
Patchy frost after 3am. Otherwise, mostly cloudy, with a low around 34.
Saturday
Areas of frost before 8am. Otherwise, mostly sunny, with a high near 57.
Saturday Night
Partly cloudy, with a low around 40.
Sunday
Mostly sunny, with a high near 66.
Sunday Night
Partly cloudy, with a low around 46.
Monday
Partly sunny, with a high near 66.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
McHenry IL
 42.34°N 88.26°W
Last Update:
8:01 pm CDT Apr 27, 2026
Forecast Valid:
8pm CDT Apr 27, 2026-6pm CDT May 4, 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