Weather for McHenry, Illinois
Current Weather
Five Day Weather Forecast
Tue
H: 41°F
L: 28°F
Wed
H: 61°F
L: 29°F
Thu
H: 60°F
L: 46°F
Fri
H: 58°F
L: 42°F
Sat
H: 51°F
L: 38°F
Air Quality
Nitrogen Dioxide: 3.95 μg/m3
Sulphur Dioxide: 1.65 μg/m3
Ozone: 85 μg/m3
Astronomical
Sun Transit: 12:55 AM
Sunset: 7:26 PM
Daylight: 13 hrs mins
Moon Transit: 4:51 AM
Moonset: 9:03 AM
Moon Phase: Waning Gibbous
Moon Illumination: 64.3%
Best Times for Fishing or Hunting
Major Periods
4:21 AM - 6:51 AM5:01 PM - 7:31 PM
Minor Periods
8:33 AM - 10:03 AM12:08 AM - 1:38 AM
Action Rating: 4 out of 5
Flood Watch issued April 6 at 10:24AM CDT until April 12 at 7:00AM CDT by NWS Chicago IL
Effective: Mon April 6, 2026, 10:24 AM
Expires: Tue April 7, 2026, 4:30 AM
...The Flood Watch continues for the following rivers in Illinois... Fox River at Algonquin Lock & Dam tailwater affecting Kane, McHenry and Lake IL Counties. ...The Flood Watch is extended for the following rivers in Illinois... Des Plaines River at Lincolnshire affecting Northern Cook and Lake IL zones. For the Fox River (Illinois)...including Algonquin Lock & Dam tailwater, Montgomery, Dayton...flooding is possible. * WHAT...Flooding is possible. * WHERE...Fox River from Johnsburg downstream to Red Gate Road in St. Charles, including the Algonquin Lock & Dam tailwater gauge. * WHEN...From Tuesday afternoon to Sunday morning. * IMPACTS...At 9.5 feet, Fox River Drive threatened in East Dundee. Boathouses threatened along the river in Cary. * ADDITIONAL DETAILS... - At 9:30 AM CDT Monday the stage was 9.3 feet. - Forecast...Flood stage may be reached early tomorrow afternoon. - Flood stage is 9.5 feet. - http://www.weather.gov/safety/flood
A Flood Watch means water levels above flood stage are possible, but not yet certain, based upon the latest forecasts. Persons along rivers and streams in the watch area should monitor the latest forecasts and be prepared to take action should flooding develop. These forecasts are based on observed precipitation as well as forecast precipitation 24 hours into the future. Changes to the rainfall forecast, or any additional rainfall after 24 hours, may cause changes to these river forecasts. Additional information is available at www.weather.gov. The next statement will be issued by late tonight.
Flood Warning issued April 6 at 8:26PM CDT until April 11 at 7:00PM CDT by NWS Chicago IL
Effective: Mon April 6, 2026, 8:26 PM
Expires: Tue April 7, 2026, 2:30 PM
...The National Weather Service in Chicago IL has issued a Flood Warning for the following rivers in Illinois... Fox River at Algonquin Lock & Dam tailwater affecting McHenry, Lake IL and Kane Counties. * WHAT...Minor flooding is forecast. * WHERE...Fox River from Johnsburg downstream to Red Gate Road in St. Charles, including the Algonquin Lock & Dam tailwater gauge. * WHEN...From Tuesday afternoon to Saturday evening. * IMPACTS...At 9.5 feet, Fox River Drive threatened in East Dundee. Boathouses threatened along the river in Cary. * ADDITIONAL DETAILS... - At 7:30 PM CDT Monday the stage was 9.4 feet. - Forecast...The river is expected to rise above flood stage Tuesday afternoon to a crest of 9.7 feet Wednesday evening. It will then fall below flood stage early Saturday afternoon. - Flood stage is 9.5 feet. - http://www.weather.gov/safety/flood
A Flood Warning means water levels above flood stage are imminent or may already be occurring. Persons along rivers and streams in the warned area should take immediate precautions to protect life and property. These forecasts are based on observed precipitation as well as forecast precipitation 24 hours into the future. Changes to the rainfall forecast, or any additional rainfall after 24 hours, may cause changes to these river forecasts. Additional information is available at www.weather.gov. The next statement will be issued by Tuesday afternoon.
Flood Warning issued April 6 at 10:24AM CDT until April 9 at 4:00PM CDT by NWS Chicago IL
Effective: Mon April 6, 2026, 10:24 AM
Expires: Tue April 7, 2026, 4:30 AM
...The Flood Warning is extended for the following rivers in Illinois... Des Plaines River near Gurnee affecting Lake IL County. Des Plaines River near Russell affecting Lake IL County. Kishwaukee River near Perryville affecting Winnebago County. ...The Flood Warning continues for the following rivers in Indiana... Kankakee River at Dunns Bridge affecting Porter and Jasper Counties. Kankakee River at Shelby affecting Lake IN and Newton Counties. For the Des Plaines River...including Russell, Gurnee, Lincolnshire, Des Plaines, River Forest, Riverside...Minor flooding is forecast. * WHAT...Minor flooding is occurring and minor flooding is forecast. * WHERE...Des Plaines River from IL/WI state line downstream to US-41 in Gurnee, including the Russell gauge. * WHEN...Until Thursday afternoon. * IMPACTS...At 9.5 feet, Residential structures threatened along Russell Road between the river and Kilbourne Road. Industrial parking lots threatened along Kilbourne Road. * ADDITIONAL DETAILS... - At 9:30 AM CDT Monday the stage was 8.8 feet. - Recent Activity...The maximum river stage in the 24 hours ending at 9:30 AM CDT Monday was 8.8 feet. - Forecast...The river is expected to rise to a crest of 8.9 feet this afternoon. It is forecast to fall below flood stage late Thursday morning. - Flood stage is 7.0 feet. - http://www.weather.gov/safety/flood
A Flood Warning means water levels above flood stage are imminent or may already be occurring. Persons along rivers and streams in the warned area should take immediate precautions to protect life and property. These forecasts are based on observed precipitation as well as forecast precipitation 24 hours into the future. Changes to the rainfall forecast, or any additional rainfall after 24 hours, may cause changes to these river forecasts. Additional information is available at www.weather.gov. The next statement will be issued by late tonight.
Flood Warning issued April 6 at 10:24AM CDT until April 10 at 1:00PM CDT by NWS Chicago IL
Effective: Mon April 6, 2026, 10:24 AM
Expires: Tue April 7, 2026, 4:30 AM
...The Flood Warning is extended for the following rivers in Illinois... Des Plaines River near Gurnee affecting Lake IL County. Des Plaines River near Russell affecting Lake IL County. Kishwaukee River near Perryville affecting Winnebago County. ...The Flood Warning continues for the following rivers in Indiana... Kankakee River at Dunns Bridge affecting Porter and Jasper Counties. Kankakee River at Shelby affecting Lake IN and Newton Counties. For the Des Plaines River...including Russell, Gurnee, Lincolnshire, Des Plaines, River Forest, Riverside...Minor flooding is forecast. * WHAT...Minor flooding is occurring and minor flooding is forecast. * WHERE...Des Plaines River from US-41 in Gurnee downstream to Townline Road in Vernon Hills, including the Gurnee gauge. * WHEN...Until early Friday afternoon. * IMPACTS...At 9.0 feet, Kilbourne Road and Emerald Avenue threatened near Grand Avenue in Gurnee. * ADDITIONAL DETAILS... - At 9:30 AM CDT Monday the stage was 7.9 feet. - Recent Activity...The maximum river stage in the 24 hours ending at 9:30 AM CDT Monday was 7.9 feet. - Forecast...The river is expected to rise to a crest of 8.4 feet tomorrow evening. It is forecast to fall below flood stage Friday morning. - Flood stage is 7.0 feet. - http://www.weather.gov/safety/flood
A Flood Warning means water levels above flood stage are imminent or may already be occurring. Persons along rivers and streams in the warned area should take immediate precautions to protect life and property. These forecasts are based on observed precipitation as well as forecast precipitation 24 hours into the future. Changes to the rainfall forecast, or any additional rainfall after 24 hours, may cause changes to these river forecasts. Additional information is available at www.weather.gov. The next statement will be issued by late tonight.
Flood Watch issued April 6 at 10:24AM CDT until April 10 at 4:00PM CDT by NWS Chicago IL
Effective: Mon April 6, 2026, 10:24 AM
Expires: Tue April 7, 2026, 4:30 AM
...The Flood Watch continues for the following rivers in Illinois... Fox River at Algonquin Lock & Dam tailwater affecting Kane, McHenry and Lake IL Counties. ...The Flood Watch is extended for the following rivers in Illinois... Des Plaines River at Lincolnshire affecting Northern Cook and Lake IL zones. For the Fox River (Illinois)...including Algonquin Lock & Dam tailwater, Montgomery, Dayton...flooding is possible. * WHAT...Flooding is possible. * WHERE...Des Plaines River from Townline Road in Libertyville downstream to Palatine Road in Prospect Heights, including the Lincolnshire gauge. * WHEN...From Tuesday afternoon to Friday afternoon. * IMPACTS...At 13.0 feet, Low-lying trails in Wright Woods Forest Preserve are inundated. * ADDITIONAL DETAILS... - At 9:45 AM CDT Monday the stage was 11.9 feet. - Forecast...Flood stage may be reached early tomorrow afternoon. - Flood stage is 12.5 feet. - http://www.weather.gov/safety/flood
A Flood Watch means water levels above flood stage are possible, but not yet certain, based upon the latest forecasts. Persons along rivers and streams in the watch area should monitor the latest forecasts and be prepared to take action should flooding develop. These forecasts are based on observed precipitation as well as forecast precipitation 24 hours into the future. Changes to the rainfall forecast, or any additional rainfall after 24 hours, may cause changes to these river forecasts. Additional information is available at www.weather.gov. The next statement will be issued by late tonight.
Weather Forecast
Air Quality
Nitrogen Dioxide: 4.19 μg/m3
Sulphur Dioxide: 2.02 μg/m3
Ozone: 85.6 μg/m3
Astronomical
Sun Transit: 12:55 AM
Sunset: 7:26 PM
Daylight: 13 hrs mins
Moon Transit: 4:51 AM
Moonset: 9:03 AM
Moon Phase: Waning Gibbous
Moon Illumination: 64.3%
Best Times for Fishing or Hunting
Major Periods
4:21 AM - 6:51 AM5:01 PM - 7:31 PM
Minor Periods
8:33 AM - 10:03 AM12:08 AM - 1:38 AM
Action Rating: 4 out of 5
Weather Forecast
Air Quality
Nitrogen Dioxide: 10.1 μg/m3
Sulphur Dioxide: 6.2 μg/m3
Ozone: 78.64 μg/m3
Astronomical
Sun Transit: 12:54 AM
Sunset: 7:27 PM
Daylight: 13 hrs 3 mins
Moon Transit: 5:43 AM
Moonset: 9:54 AM
Moon Phase: Last Quarter
Moon Illumination: 53.2%
Best Times for Fishing or Hunting
Major Periods
5:13 AM - 7:43 AM5:53 PM - 8:23 PM
Minor Periods
9:24 AM - 10:54 AM1:03 AM - 2:33 AM
Action Rating: 2 out of 5
Weather Forecast
Air Quality
Nitrogen Dioxide: 4.42 μg/m3
Sulphur Dioxide: 2.17 μg/m3
Ozone: 86.84 μg/m3
Astronomical
Sun Transit: 12:54 AM
Sunset: 7:28 PM
Daylight: 13 hrs 6 mins
Moon Transit: 6:34 AM
Moonset: 10:53 AM
Moon Phase: Last Quarter
Moon Illumination: 41.9%
Best Times for Fishing or Hunting
Major Periods
6:04 AM - 8:34 AM6:44 PM - 9:14 PM
Minor Periods
10:23 AM - 11:53 AM1:50 AM - 3:20 AM
Action Rating: 3 out of 5
Weather Forecast
Air Quality
Nitrogen Dioxide: 7.46 μg/m3
Sulphur Dioxide: 1.95 μg/m3
Ozone: 72 μg/m3
Astronomical
Sun Transit: 12:54 AM
Sunset: 7:29 PM
Daylight: 13 hrs 9 mins
Moon Transit: 7:25 AM
Moonset: 11:56 AM
Moon Phase: Last Quarter
Moon Illumination: 31.0%
Best Times for Fishing or Hunting
Major Periods
6:55 AM - 9:25 AM7:34 PM - 10:04 PM
Minor Periods
11:26 AM - 12:56 AM2:29 AM - 3:59 AM
Action Rating: 3 out of 5
Weather Forecast
Air Quality
Nitrogen Dioxide: 12.6 μg/m3
Sulphur Dioxide: 1.98 μg/m3
Ozone: 62.62 μg/m3
Astronomical
Sun Transit: 12:54 AM
Sunset: 7:30 PM
Daylight: 13 hrs 11 mins
Moon Transit: 8:13 AM
Moonset: 1:03 PM
Moon Phase: Last Quarter
Moon Illumination: 21.1%
Best Times for Fishing or Hunting
Major Periods
7:43 AM - 10:13 AM8:21 PM - 10:51 PM
Minor Periods
12:33 AM - 2:03 PM3:01 AM - 4:31 AM
Action Rating: 2 out of 5