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.

Overcast

58°F

14°C

Humidity 100%
Wind Speed Vrbl 5 mph
Barometer 29.73 in (1006.0 mb)
Dewpoint 58°F (14°C)
Visibility 10.00 mi
Last update 16 Apr 6:51 am 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

  • Today

    High: 68 °F

    Scattered
    Showers

  • Tonight

    Tonight: Patchy fog after 10pm. Otherwise, partly cloudy, with a low around 50. East northeast wind around 5 mph becoming south southeast after midnight.

    Low: 50 °F

    Patchy Fog

  • Friday

    Friday: A 20 percent chance of showers and thunderstorms after 4pm. Patchy fog before 8am. Otherwise, partly sunny, with a high near 78. Breezy, with a south wind 5 to 10 mph increasing to 15 to 20 mph in the afternoon. Winds could gust as high as 30 mph.

    High: 78 °F

    Patchy Fog
    then Slight
    Chance
    T-storms and
    Breezy

  • Friday Night

    Friday Night: A slight chance of showers and thunderstorms before 7pm, then showers and possibly a thunderstorm between 7pm and 1am, then showers after 1am. Low around 43. South wind around 15 mph becoming west after midnight. Winds could gust as high as 30 mph. Chance of precipitation is 90%.

    Low: 43 °F

    T-storms then
    Showers

  • Saturday

    Saturday: A 20 percent chance of showers before 1pm. Partly sunny, with a high near 51. Breezy, with a west northwest wind 15 to 20 mph, with gusts as high as 30 mph.

    High: 51 °F

    Slight Chance
    Showers and
    Breezy

  • Saturday Night

    Saturday Night: Mostly clear, with a low around 32.

    Low: 32 °F

    Mostly Clear

  • Sunday

    Sunday: Mostly sunny, with a high near 49.

    High: 49 °F

    Mostly Sunny

  • Sunday Night

    Sunday Night: Areas of frost after midnight. Otherwise, mostly clear, with a low around 31.

    Low: 31 °F

    Partly Cloudy
    then Areas
    Frost

Detailed Forecast

Today
Scattered showers and thunderstorms, mainly before 2pm. Cloudy, then gradually becoming mostly sunny, with a high near 68. South southwest wind around 10 mph becoming north northwest in the afternoon. Winds could gust as high as 15 mph. Chance of precipitation is 40%.
Tonight
Patchy fog after 10pm. Otherwise, partly cloudy, with a low around 50. East northeast wind around 5 mph becoming south southeast after midnight.
Friday
A 20 percent chance of showers and thunderstorms after 4pm. Patchy fog before 8am. Otherwise, partly sunny, with a high near 78. Breezy, with a south wind 5 to 10 mph increasing to 15 to 20 mph in the afternoon. Winds could gust as high as 30 mph.
Friday Night
A slight chance of showers and thunderstorms before 7pm, then showers and possibly a thunderstorm between 7pm and 1am, then showers after 1am. Low around 43. South wind around 15 mph becoming west after midnight. Winds could gust as high as 30 mph. Chance of precipitation is 90%.
Saturday
A 20 percent chance of showers before 1pm. Partly sunny, with a high near 51. Breezy, with a west northwest wind 15 to 20 mph, with gusts as high as 30 mph.
Saturday Night
Mostly clear, with a low around 32.
Sunday
Mostly sunny, with a high near 49.
Sunday Night
Areas of frost after midnight. Otherwise, mostly clear, with a low around 31.
Monday
Areas of frost before 9am. Otherwise, sunny, with a high near 58.
Monday Night
Partly cloudy, with a low around 45.
Tuesday
Mostly sunny, with a high near 71.
Tuesday Night
Mostly clear, with a low around 48.
Wednesday
Mostly sunny, with a high near 67.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
McHenry IL
 42.34°N 88.26°W
Last Update:
4:01 am CDT Apr 16, 2026
Forecast Valid:
7am CDT Apr 16, 2026-6pm CDT Apr 22, 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