August weather forecastMcHenry, IL
August
Weather in August
The last month of the summer, August, is another warm month in McHenry, Illinois, with an average temperature fluctuating between 61.3°F (16.3°C) and 78.1°F (25.6°C).Temperature
McHenry, Illinois, experiences an average high-temperature of a still warm 78.1°F (25.6°C) with the onset of August, subtly varied from July's 79.7°F (26.5°C). In the month of August, the nighttime temperature in McHenry dips to a steady average of 61.3°F (16.3°C).Humidity
In August, the average relative humidity in McHenry is 82%.Rainfall
In McHenry, Illinois, during August, the rain falls for 16.1 days and regularly aggregates up to 2.56" (65mm) of precipitation. In McHenry, during the entire year, the rain falls for 152.4 days and collects up to 28.07" (713mm) of precipitation.Snowfall
June through September are months without snowfall in McHenry.Daylight
The average length of the day in August is 13h and 50min.On the first day of August in McHenry, sunrise is at 5:46 am and sunset at 8:12 pm. On the last day of the month, sunrise is at 6:18 am and sunset at 7:28 pm CDT.
Sunshine
July and August, with an average of 10h of sunshine, are months with the most sunshine in McHenry.UV index
The month with the highest UV index in McHenry is August, with an average maximum UV index of 6. A UV Index reading of 6 to 7 represents a high health hazard from exposure to the Sun's UV rays for the ordinary person.Note: The daily high UV index of 6 during August translates into the following recommendations:
Incorporate safeguards and honour sun safety principles. Protection from skin and eye damage is obligatory. The time between 10 a.m. and 4 p.m. is when UV radiation is at its peak. Limit exposure to direct sunlight during these hours. In the presence of strong sunlight, it's crucial to wear sunglasses that ward off UVA and UVB rays.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in August
McHenry, IL
- Average high temperature in August: 78.1°F
The warmest month (with the highest average high temperature) is July (79.7°F).
The month with the lowest average high temperature is January (26.6°F).
- Average low temperature in August: 61.3°F
The month with the highest average low temperature is July (63.1°F).
The coldest month (with the lowest average low temperature) is January (14.9°F).
Average pressure in August
McHenry, IL
- Average pressure in August: 29.97"Hg
The month with the highest atmospheric pressure is January (30.11"Hg).
The month with the lowest atmospheric pressure is June (29.92"Hg).
Average wind speed in August
McHenry, IL
- Average wind speed in August: 6.2mph
The windiest month (with the highest average wind speed) is January (10mph).
The calmest month (with the lowest average wind speed) is August (6.2mph).
Average humidity in August
McHenry, IL
- Average humidity in August: 82%
The months with the highest relative humidity are January and February (85%).
The month with the lowest relative humidity is October (76%).
Average rainfall in August
McHenry, IL
- Average rainfall in August: 2.56"
The wettest month (with the highest rainfall) is June (3.58").
The driest month (with the least rainfall) is December (1.34").
Average rainfall days in August
McHenry, IL
- Average rainfall days in August: 16.1 days
The month with the highest number of rainy days is July (18.3 days).
The month with the least rainy days is February (4.9 days).
Average snowfall in August
McHenry, IL
- Average snowfall in August: 0"
The month with the highest snowfall is January (5.16").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in August
McHenry, IL
- Average snowfall days in August: 0 days
The month with the highest number of snowfall days is January (13.3 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in August /
Average sunshine in August
McHenry, IL
- Average daylight in August: 13h and 48min
The month with the longest days is June (Average daylight: 15h and 12min).
The month with the shortest days is December (Average daylight: 9h and 6min).
- Average sunshine in August: 10h and 0min
The months with the most sunshine are July and August (Average sunshine: 10h and 0min).
The month with the least sunshine is January (Average sunshine: 3h and 42min).
Average sunshine days in August
McHenry, IL
- Average sunshine days in August: 12.4 days
The month with the most sunshine days is November (16 days).
The month with the least sunshine days is June (10.2 days).
Average UV index in August
McHenry, IL
- Average UV index in August: 6
The month with the highest UV index is August (UV index 6).
The months with the lowest UV index are January and December (UV index 1).
Average cloud cover in August
McHenry, IL
- Average cloud cover in August: 31
The month with the most cloud cover is January (Cloud cover 62).
The months with the least cloud cover are August and September (Cloud cover 31).
Average visibility in August
McHenry, IL
- Average visibility in August: 6mi
The months with the highest visibility are March, April, May, June, July, August, September, October, November and December (6mi).
The months with the lowest visibility are January and February (5mi).
