Weather for McHenry, Illinois
Current Weather
Humidity: 73%
Feels Like: 64°F
Wind: WSW 7.4 mph
Wind Gusts: 14.6 mph
Precipitation: 0 in
Cloud Cover: 50%
Visibility: 9 mi
UV Index: 0
Five Day Weather Forecast
Thu
H: 74°F
L: 51°F
Fri
H: 68°F
L: 48°F
Sat
H: 70°F
L: 45°F
Sun
H: 74°F
L: 51°F
Mon
H: 75°F
L: 56°F
Air Quality
Nitrogen Dioxide: 8.88 μg/m3
Sulphur Dioxide: 2.59 μg/m3
Ozone: 82 μg/m3
Astronomical
Sun Transit: 12:54 AM
Sunset: 7:33 PM
Daylight: 13 hrs 18 mins
Moon Transit: 4:48 PM
Moonset: 9:40 PM
Moon Phase: Waxing Crescent
Moon Illumination: 21.1%
Best Times for Fishing or Hunting
Major Periods
4:11 AM - 6:41 AM4:18 PM - 6:48 PM
Minor Periods
9:10 PM - 10:40 PM11:19 AM - 12:49 AM
Action Rating: 3 out of 5
Beach Hazards Statement issued August 27 at 9:49PM CDT until August 29 at 4:00PM CDT by NWS Chicago IL
Effective: Wed August 27, 2025, 9:49 PM
Expires: Thu August 28, 2025, 6:00 AM
* WHAT...High wave action and dangerous currents expected at Lake Michigan beaches. Waves 4 to 7 ft expected. * WHERE...Lake IL, Northern Cook and Central Cook Counties. * WHEN...From Thursday afternoon through Friday afternoon. * IMPACTS...Swimming conditions will be life threatening, especially for inexperienced swimmers. For information on swim advisories or bans at Chicago beaches: www. cpdbeaches. com.
Remain out of the water to avoid dangerous swimming conditions and do not venture out onto piers, jetties, breakwalls, or other shoreline structures.
Beach Hazards Statement issued August 27 at 6:46PM CDT until August 29 at 7:00AM CDT by NWS Milwaukee/Sullivan WI
Effective: Wed August 27, 2025, 6:46 PM
Expires: Thu August 28, 2025, 3:00 AM
* WHAT...Life threatening waves of 3 to 7 feet and dangerous currents are expected. * WHERE...Sheboygan, Ozaukee, Milwaukee, Racine and Kenosha Counties. * WHEN...From Thursday afternoon through early Friday morning. * IMPACTS...Dangerous swimming conditions are expected due to high waves and onshore winds. * ADDITIONAL DETAILS...Northerly exposed beaches, piers, and/or breakwalls will be most vulnerable to these dangerous currents. Breezy north to northeast winds and building waves are expected.
Stay out of the water and away from dangerous areas like piers and breakwalls. Strong structural and longshore currents are expected. Rip currents are possible.
Beach Hazards Statement issued August 27 at 8:54PM CDT until August 29 at 7:00AM CDT by NWS Milwaukee/Sullivan WI
Effective: Wed August 27, 2025, 8:54 PM
Expires: Thu August 28, 2025, 5:00 AM
* WHAT...Life threatening waves of 3 to 7 feet and dangerous currents are expected. * WHERE...Sheboygan, Ozaukee, Milwaukee, Racine and Kenosha Counties. * WHEN...From Thursday afternoon through early Friday morning. * IMPACTS...Dangerous swimming conditions are expected due to high waves and onshore winds. * ADDITIONAL DETAILS...Northerly exposed beaches, piers, and/or breakwalls will be most vulnerable to these dangerous currents. Breezy north to northeast winds and building waves are expected.
Stay out of the water and away from dangerous areas like piers and breakwalls. Strong structural and longshore currents are expected. Rip currents are possible.
Beach Hazards Statement issued August 27 at 6:46PM CDT until August 29 at 7:00AM CDT by NWS Milwaukee/Sullivan WI
Effective: Wed August 27, 2025, 6:46 PM
Expires: Thu August 28, 2025, 3:00 AM
* WHAT...Life threatening waves of 3 to 7 feet and dangerous currents are expected. * WHERE...Sheboygan, Ozaukee, Milwaukee, Racine and Kenosha Counties. * WHEN...From Thursday afternoon through early Friday morning. * IMPACTS...Dangerous swimming conditions are expected due to high waves and onshore winds. * ADDITIONAL DETAILS...Northerly exposed beaches, piers, and/or breakwalls will be most vulnerable to these dangerous currents. Breezy north to northeast winds and building waves are expected.
Stay out of the water and away from dangerous areas like piers and breakwalls. Strong structural and longshore currents are expected. Rip currents are possible.
Weather Forecast
Average Temperature: 63.4°F
Average Humidity: 86%
Wind: 10.3 mph
UV Index: 1.3
Air Quality
Nitrogen Dioxide: 10.32 μg/m3
Sulphur Dioxide: 1.77 μg/m3
Ozone: 80.2 μg/m3
Astronomical
Sun Transit: 12:54 AM
Sunset: 7:33 PM
Daylight: 13 hrs 18 mins
Moon Transit: 4:48 PM
Moonset: 9:40 PM
Moon Phase: Waxing Crescent
Moon Illumination: 21.1%
Best Times for Fishing or Hunting
Major Periods
4:11 AM - 6:41 AM4:18 PM - 6:48 PM
Minor Periods
9:10 PM - 10:40 PM11:19 AM - 12:49 AM
Action Rating: 3 out of 5
Weather Forecast
Average Temperature: 57.4°F
Average Humidity: 81%
Wind: 8.3 mph
UV Index: 1.8
Air Quality
Nitrogen Dioxide: 8.19 μg/m3
Sulphur Dioxide: 1.24 μg/m3
Ozone: 67.4 μg/m3
Astronomical
Sun Transit: 12:53 AM
Sunset: 7:31 PM
Daylight: 13 hrs 16 mins
Moon Transit: 5:33 PM
Moonset: 10:08 PM
Moon Phase: Waxing Crescent
Moon Illumination: 31.0%
Best Times for Fishing or Hunting
Major Periods
4:55 AM - 7:25 AM5:03 PM - 7:33 PM
Minor Periods
9:38 PM - 11:08 PM12:23 AM - 1:53 PM
Action Rating: 3 out of 5
Weather Forecast
Average Temperature: 58.5°F
Average Humidity: 78%
Wind: 7.6 mph
UV Index: 0
Air Quality
Nitrogen Dioxide: 12.67 μg/m3
Sulphur Dioxide: 1.55 μg/m3
Ozone: 65.16 μg/m3
Astronomical
Sun Transit: 12:53 AM
Sunset: 7:30 PM
Daylight: 13 hrs 13 mins
Moon Transit: 6:21 PM
Moonset: 10:42 PM
Moon Phase: First Quarter
Moon Illumination: 41.9%
Best Times for Fishing or Hunting
Major Periods
5:41 AM - 8:11 AM5:51 PM - 8:21 PM
Minor Periods
10:12 PM - 11:42 PM1:27 PM - 2:57 PM
Action Rating: 2 out of 5
Weather Forecast
Average Temperature: 61.4°F
Average Humidity: 70%
Wind: 6.7 mph
UV Index: 5
Air Quality
Nitrogen Dioxide: 37.2 μg/m3
Sulphur Dioxide: 2.23 μg/m3
Ozone: 46.69 μg/m3
Astronomical
Sun Transit: 12:53 AM
Sunset: 7:28 PM
Daylight: 13 hrs 10 mins
Moon Transit: 7:12 PM
Moonset: 11:23 PM
Moon Phase: First Quarter
Moon Illumination: 53.2%
Best Times for Fishing or Hunting
Major Periods
6:31 AM - 9:01 AM6:42 PM - 9:12 PM
Minor Periods
12:00 AM - 12:00 AM2:30 PM - 4:00 PM
Action Rating: 3 out of 5
Weather Forecast
Average Temperature: 62.6°F
Average Humidity: 72%
Wind: 8.5 mph
UV Index: 5
Air Quality
Nitrogen Dioxide: 0 μg/m3
Sulphur Dioxide: 0 μg/m3
Ozone: 0 μg/m3
Astronomical
Sun Transit: 12:52 AM
Sunset: 7:26 PM
Daylight: 13 hrs 7 mins
Moon Transit: 8:05 PM
Moonset: 12:23 AM
Moon Phase: First Quarter
Moon Illumination: 64.3%
Best Times for Fishing or Hunting
Major Periods
7:23 AM - 9:53 AM7:35 PM - 10:05 PM
Minor Periods
3:27 PM - 4:57 PM12:00 AM - 12:00 AM
Action Rating: 3 out of 5