August weather forecast
McHenry, IL

Weather in August

The last month of the summer, August, is another warm month in McHenry, Illinois, with an average temperature varying between 61.3°F (16.3°C) and 78.1°F (25.6°C).

Temperature

In McHenry, the average high-temperature in August is almost the same as in July - a still warm 78.1°F (25.6°C). In August, the average low-temperature is 61.3°F (16.3°C).

Humidity

In August, the average relative humidity is 82%.

Rainfall

In McHenry, in August, during 16.1 rainfall days, 2.56" (65mm) of precipitation is typically accumulated. In McHenry, during the entire year, the rain falls for 152.4 days and collects up to 28.07" (713mm) of precipitation.

Snowfall

In McHenry, snow does not fall in June through September.

Daylight

The average length of the day in August is 13h and 50min.
On the first day of August in McHenry, sunrise is at 5:45 am and sunset at 8:13 pm. On the last day of the month, sunrise is at 6:17 am and sunset at 7:29 pm CDT.

Sunshine

July and August, with an average of 10h of sunshine, are months with the most sunshine.

UV index

The month with the highest UV index is August, with an average maximum UV index of 6. A UV Index of 6 to 7 symbolizes a high health hazard from unsafe exposure to UV radiation for the ordinary person.
Note: The average daily UV index of 6 in August transform into the following instructions:
Take precautions and utilize sun safety practices. Protection against skin and eye damage is required. Seek shade and minimize exposure to direct Sun in a period between 10 a.m. and 4 p.m. when UV radiation is most intense; keep in mind that shade structures like parasols or canopies do not provide perfect sun protection. A wide-brim hat offers excellent sun protection for the eyes, ears, face, and neck. Sunglasses with UVA and UVB protection significantly reduce eye damage from sun exposure. Tightly woven, loose-fitting clothes provide additional protection from the Sun.
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FAQ

What is the temperature in August in McHenry?

The average high-temperature, in August, in McHenry, Illinois, is 78.1°F (25.6°C), while the average low-temperature is 61.3°F (16.3°C).

What is the average humidity in August in McHenry?

In McHenry, the average relative humidity in August is 82%.

How many days does it rain in August in McHenry?

In McHenry, during August, the rain falls for 16.1 days and regularly aggregates up to 2.56" (65mm) of precipitation.

When it does not snow in McHenry?

June through September are months without snowfall.

What is the average length of the day in August in McHenry?

The average day length in August in McHenry is 13h and 50min.

When is the sunrise / sunset in August in McHenry?

In August, on the first day of the month, sunrise is at 5:45 am and sunset at 8:13 pm. On the last day of the month, sunrise is at 6:17 am and sunset at 7:29 pm CDT.

What is the month with the most sunshine in McHenry?

The months with the most sunshine in McHenry are July and August, with an average of 10h of sunshine.

How long on average sun shines in August in McHenry?

The average sunshine duration in August in McHenry, Illinois, is 10h.

When is the highest UV index in McHenry?

August is the month with the highest UV index in McHenry, Illinois, with an average maximum UV index of 6.

How high is the UV index in August in McHenry?

In August, the average daily maximum UV index in McHenry is 6. A UV Index reading of 6 to 7 represents a high health threat from unprotected exposure to UV radiation.
Average humidity
Average rainfall days
Average snowfall
Average snowfall days
Average sunshine
Average sunshine days
Average UV index
Average cloud cover
Average visibility

Average temperature in August
McHenry, IL

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).

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Average pressure in August
McHenry, IL

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).

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Average wind speed in August
McHenry, IL

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).

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Average humidity in August
McHenry, IL

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%).

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Average rainfall in August
McHenry, IL

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").

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Average rainfall days in August
McHenry, IL

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).

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Average snowfall in August
McHenry, IL

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").

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Average snowfall days in August
McHenry, IL

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).

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Average daylight in August /
Average sunshine in August
McHenry, IL

Average daylight in August / Average sunshine in August - McHenry, IL
  • Average daylight in August: 13h and 50min

The month with the longest days is June (Average daylight: 15h and 14min).
The month with the shortest days is December (Average daylight: 9h and 8min).

  • 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).

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Average sunshine days in August
McHenry, IL

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).

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Average UV index in August
McHenry, IL

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).

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Average cloud cover in August
McHenry, IL

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).

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Average visibility in August
McHenry, IL

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).

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