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Hazardous Weather Conditions

Current conditions at

Chicago/Waukegan Regional Airport (KUGN)

Lat: 42.43°NLon: 87.86°WElev: 709ft.

Overcast

42°F

6°C

Humidity 76%
Wind Speed NE 12 mph
Barometer 30.03 in (1017.6 mb)
Dewpoint 35°F (2°C)
Visibility 10.00 mi
Wind Chill35°F (2°C)
Last update 1 May 12:51 pm CDT
Extended Forecast for

McHenry IL

Frost Advisory May 2, 01:00am until May 2, 08:00am
Flood Warning May 1, 01:17pm until May 5, 01:00am
Click here for hazard details and duration
Frost Advisory
Flood Warning
  •  
    Flood Warning May 1, 01:17pm until May 5, 01:00am

    NOW until 1:00am Tue

    Flood Warning

  • This Afternoon

    High: 48 °F

    Slight Chance
    Showers

  • Tonight

    Tonight: Widespread frost, mainly after 2am. Otherwise, partly cloudy, with a low around 32. East northeast wind around 5 mph becoming calm in the evening.

    Low: 32 °F

    Frost

  • Saturday

    Saturday: Areas of frost before 8am. Otherwise, mostly sunny, with a high near 54. North northwest wind 5 to 10 mph.

    High: 54 °F

    Areas Frost
    then Mostly
    Sunny

  • Saturday Night

    Saturday Night: Partly cloudy, with a low around 40. West wind 5 to 10 mph becoming south in the evening. Winds could gust as high as 15 mph.

    Low: 40 °F

    Partly Cloudy

  • Sunday

    Sunday: A 20 percent chance of showers. Mostly cloudy, with a high near 64. Breezy, with a southwest wind 15 to 20 mph, with gusts as high as 30 mph.

    High: 64 °F

    Slight Chance
    Showers and
    Breezy

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 45.

    Low: 45 °F

    Mostly Clear

  • Monday

    Monday: A 30 percent chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 73.

    High: 73 °F

    Mostly Sunny
    then Chance
    Showers

  • Monday Night

    Monday Night: A chance of showers. Mostly cloudy, with a low around 44.

    Low: 44 °F

    Chance
    Showers

Detailed Forecast

This Afternoon
A 20 percent chance of showers after 2pm. Partly sunny, with a high near 48. North wind 5 to 10 mph, with gusts as high as 15 mph.
Tonight
Widespread frost, mainly after 2am. Otherwise, partly cloudy, with a low around 32. East northeast wind around 5 mph becoming calm in the evening.
Saturday
Areas of frost before 8am. Otherwise, mostly sunny, with a high near 54. North northwest wind 5 to 10 mph.
Saturday Night
Partly cloudy, with a low around 40. West wind 5 to 10 mph becoming south in the evening. Winds could gust as high as 15 mph.
Sunday
A 20 percent chance of showers. Mostly cloudy, with a high near 64. Breezy, with a southwest wind 15 to 20 mph, with gusts as high as 30 mph.
Sunday Night
Mostly clear, with a low around 45.
Monday
A 30 percent chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 73.
Monday Night
A chance of showers. Mostly cloudy, with a low around 44.
Tuesday
A chance of showers. Partly sunny, with a high near 60.
Tuesday Night
A chance of showers before 1am. Mostly cloudy, with a low around 40.
Wednesday
Partly sunny, with a high near 57.
Wednesday Night
Mostly cloudy, with a low around 38.
Thursday
Mostly sunny, with a high near 57.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
McHenry IL
 42.34°N 88.26°W
Last Update:
12:51 pm CDT May 1, 2026
Forecast Valid:
1pm CDT May 1, 2026-6pm CDT May 7, 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