August weather forecast
Williamsville, IL

Weather in August

The last month of the summer, August, is also a moderately hot month in Williamsville, Illinois, with an average temperature varying between 81.7°F (27.6°C) and 64°F (17.8°C).

Temperature

In August, the average high-temperature is practically the same as in July - a still moderately hot 81.7°F (27.6°C). The average low-temperature, in August, is 64°F (17.8°C).

Heat index

The average heat index in August is calculated to be a tropical 87.8°F (31°C). Constant exposure and activity lead to possible fatigue. Prolonged exercise may result in heat cramps.
Note that heat index values are valued for light wind and location in the shade. Exposure to direct sunshine can increase heat index values by up to 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'apparent temperature', 'felt air temperature', 'feels like', or 'real feel', is a measure that combines air temperature and relative humidity into a single value that indicates how hot the weather feels. Additional factors like activity, pregnancy, wind, and clothing affect individual temperature impact. Bear in mind that direct sunshine exposure increases weather impact, and may raise heat index by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are especially crucial for babies and toddlers. Children are often less aware of the need to rest and re-hydrate. Thirst is a late sign of dehydration - it is vital to remain hydrated, particularly during prolonged physical activities.

Humidity

The average relative humidity in August in Williamsville is 82%.

Rainfall

In Williamsville, during August, the rain falls for 12.8 days and regularly aggregates up to 1.89" (48mm) of precipitation. Throughout the year, in Williamsville, there are 131.5 rainfall days, and 18.54" (471mm) of precipitation is accumulated.

Snowfall

In Williamsville, snow does not fall in May through October.

Daylight

In Williamsville, the average length of the day in August is 13h and 42min.
On the first day of the month, sunrise is at 5:56 am and sunset at 8:12 pm. On the last day of August, in Williamsville, Illinois, sunrise is at 6:25 am and sunset at 7:31 pm CDT.

Sunshine

In August, the average sunshine in Williamsville is 9.9h.

UV index

June through August, with an average maximum UV index of 6, are months with the highest UV index. A UV Index value of 6 to 7 symbolizes a high health vulnerability from unprotected exposure to Sun's UV rays 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. On bright days sunglasses that block both UVA and UVB rays should be worn. A hat with a wide brim is extremely helpful, as it can prevent roughly 50% of UV radiation from reaching the eyes.
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FAQ

What is the temperature in August in Williamsville?

In August, the average high-temperature is 81.7°F (27.6°C), and the average low-temperature is 64°F (17.8°C). The average heat index (a.k.a. 'felt air temperature', 'feels like'), which combines air temperature and relative humidity, in August is calculated to be 87.8°F (31°C).

What is the average humidity in August in Williamsville?

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

How many days does it rain in August in Williamsville?

In August, in Williamsville, Illinois, the rain falls for 12.8 days. Throughout August, 1.89" (48mm) of precipitation is accumulated.

When it does not snow in Williamsville?

May through October are months without snowfall in Williamsville, Illinois.

How many hours of daylight does Williamsville have in August?

The average day length in August in Williamsville, Illinois, is 13h and 42min.

What time are sunrise and sunset in August in Williamsville?

On the first day of August in Williamsville, Illinois, sunrise is at 5:56 am and sunset at 8:12 pm. On the last day of the month, sunrise is at 6:25 am and sunset at 7:31 pm CDT.

How long on average sun shines in August in Williamsville?

In Williamsville, Illinois, the average sunshine duration in August is 9.9h.

What are the months with the highest UV index in Williamsville?

June through August, with an average maximum UV index of 6, are months with the highest UV index.

What is the UV index intensity in August in Williamsville?

In August, the average daily maximum UV index in Williamsville is 6. A UV Index reading of 6 to 7 represents a high hazard to health from unsafe exposure to Sun's UV rays.
Average humidity
Average rainfall days
Average snowfall
Average snowfall days
Average daylight
Average sunshine
Average sunshine days
Average UV index
Average cloud cover
Average visibility

Average temperature in August
Williamsville, IL

Average temperature in August - Williamsville, IL
  • Average high temperature in August: 81.7°F

The warmest month (with the highest average high temperature) is July (82.8°F).
The month with the lowest average high temperature is January (33.1°F).

  • Average low temperature in August: 64°F

The month with the highest average low temperature is July (66°F).
The coldest month (with the lowest average low temperature) is January (20.8°F).

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Average pressure in August
Williamsville, IL

Average pressure in August - Williamsville, IL
  • Average pressure in August: 29.98"Hg

The month with the highest atmospheric pressure is January (30.15"Hg).
The month with the lowest atmospheric pressure is June (29.91"Hg).

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Average wind speed in August
Williamsville, IL

Average wind speed in August - Williamsville, IL
  • Average wind speed in August: 6.2mph

The windiest months (with the highest average wind speed) are January and April (10.4mph).
The calmest months (with the lowest average wind speed) are July and August (6.2mph).

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Average humidity in August
Williamsville, IL

Average humidity in August - Williamsville, IL
  • Average humidity in August: 82%

The month with the highest relative humidity is July (84%).
The month with the lowest relative humidity is October (70%).

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Average rainfall in August
Williamsville, IL

Average rainfall in August - Williamsville, IL
  • Average rainfall in August: 1.89"

The wettest month (with the highest rainfall) is June (2.36").
The driest month (with the least rainfall) is December (0.83").

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Average rainfall days in August
Williamsville, IL

Average rainfall days in August - Williamsville, IL
  • Average rainfall days in August: 12.8 days

The month with the highest number of rainy days is May (17 days).
The month with the least rainy days is February (5.7 days).

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Average snowfall in August
Williamsville, IL

Average snowfall in August - Williamsville, IL
  • Average snowfall in August: 0"

The month with the highest snowfall is January (1.81").
The months with the least snowfall are May, June, July, August, September and October (0").

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Average snowfall days in August
Williamsville, IL

Average snowfall days in August - Williamsville, IL
  • Average snowfall days in August: 0 days

The month with the highest number of snowfall days is January (8 days).
The months with the least snowfall days are May, June, July, August and September (0 days).

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

Average daylight in August / Average sunshine in August - Williamsville, IL
  • Average daylight in August: 13h and 4min

The month with the longest days is June (Average daylight: 15h and 0min).
The month with the shortest days is December (Average daylight: 9h and 24min).

  • Average sunshine in August: 9h and 5min

The month with the most sunshine is June (Average sunshine: 10h and 24min).
The month with the least sunshine is January (Average sunshine: 4h and 6min).

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Average sunshine days in August
Williamsville, IL

Average sunshine days in August - Williamsville, IL
  • Average sunshine days in August: 14.7 days

The month with the most sunshine days is December (20.5 days).
The month with the least sunshine days is May (11.5 days).

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Average UV index in August
Williamsville, IL

Average UV index in August - Williamsville, IL
  • Average UV index in August: 6

The months with the highest UV index are June, July and August (UV index 6).
The months with the lowest UV index are January, February, November and December (UV index 2).

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Average cloud cover in August
Williamsville, IL

Average cloud cover in August - Williamsville, IL
  • Average cloud cover in August: 30

The month with the most cloud cover is January (Cloud cover 55).
The months with the least cloud cover are June, August and September (Cloud cover 30).

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Average visibility in August
Williamsville, IL

Average visibility in August - Williamsville, IL
  • Average visibility in August: 5mi

The months with the highest visibility are January, February, March, April, May, June, September, October, November and December (6mi).
The months with the lowest visibility are July and August (5mi).

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