August weather forecast
Naperville, IL

A covered bridge over a river along the famous Naperville Riverwalk in Naperville, Illinois
A covered bridge over a river along the famous Naperville Riverwalk in Naperville, Illinois

Weather in August

August, the last month of the summer, in Naperville, is another warm month, with average temperature fluctuating between 80.1°F (26.7°C) and 63.5°F (17.5°C).

Temperature

In Naperville, the average high-temperature in August is relatively the same as in July - a still moderately hot 80.1°F (26.7°C). In Naperville, the average low-temperature is 63.5°F (17.5°C).

Humidity

In August, the average relative humidity is 79%.

Rainfall

In Naperville, it is raining for 15.3 days, with typically 1.81" (46mm) of accumulated precipitation. Throughout the year, there are 132.2 rainfall days, and 16.22" (412mm) of precipitation is accumulated.

Snowfall

In Naperville snow does not fall in May through September.

Daylight

In Naperville, the average length of the day is 13.8h.

Sunshine

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

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 the exposure to the Sun's UV rays for average individuals.
Note: The daily maximum UV index of 6 in August interpret into the following advice:
Take precautions and adopt sun safety practices. Protection against sunburn is obliged. The Sun's UV radiation is most powerful between 10 a.m. and 4 p.m. To the extent possible, limit exposure to the direct sun during these hours. A wide-brim hat offers excellent sun protection for 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 average humidity in August in Naperville?

In August, the average relative humidity in Naperville is 79%.

How many days does it rain in August in Naperville?

In Naperville, Illinois, in August, during 15.3 rainfall days, 1.81" (46mm) of precipitation is typically accumulated.

When it does not snow in Naperville?

In Naperville snow does not fall in May through September.

How many hours of daylight does Naperville have in August?

In Naperville, the average length of the day in August is 13.8h.

What are the months with the most sunshine in Naperville?

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

How many hours of sunshine does Naperville have in August?

In August, the average sunshine in Naperville, Illinois, is 10h.

What is the month with the highest UV index in Naperville?

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

What is the UV index reading in August in Naperville?

In Naperville, Illinois, the average daily maximum UV index in August is 6. A UV Index estimate of 6 to 7 represents a high hazard to health from the exposure to the Sun's UV rays.

Average temperature in August
Naperville, IL

Average temperature in August - Naperville, IL
  • Average high temperature in August: 80.1°F

The warmest month (with the highest average high temperature) is July (81.7°F).
The month with the lowest average high temperature is January (28.4°F).

  • Average low temperature in August: 63.5°F

The month with the highest average low temperature is July (65.1°F).
The coldest month (with the lowest average low temperature) is January (17.1°F).

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Average pressure in August
Naperville, IL

Average pressure in August - Naperville, IL
  • Average pressure in August: 29.98"

The month with the highest atmospheric pressure is January (30.11").
The month with the lowest atmospheric pressure is June (29.92").

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Average wind speed in August
Naperville, IL

Average wind speed in August - Naperville, IL
  • Average wind speed in August: 6mph

The windiest month (with the highest average wind speed) is January (9.7mph).
The calmest month (with the lowest average wind speed) is August (6mph).

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Average humidity in August
Naperville, IL

Average humidity in August - Naperville, IL
  • Average humidity in August: 79%

Months with the highest relative humidity are January and February (83%).
The month with the lowest relative humidity is October (73%).

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Average rainfall in August
Naperville, IL

Average rainfall in August - Naperville, IL
  • Average rainfall in August: 1.81"

The wettest month (with the highest rainfall) is May (2.09").
The driest month (with the least rainfall) is December (0.71").

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Average rainfall days in August
Naperville, IL

Average rainfall days in August - Naperville, IL
  • Average rainfall days in August: 15.3 days

The month with the highest number of rainy days is July (17.3 days).
The month with the least rainy days is February (4.4 days).

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Average snowfall in August
Naperville, IL

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

The month with the highest snowfall is January (1.85").
Months with the least snowfall are May, June, July, August and September (0").

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Average snowfall days in August
Naperville, IL

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

The month with the highest number of snowfall days is January (11.1 days).
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
Naperville, IL

Average daylight in August / Average sunshine in August - Naperville, IL
  • Average daylight in August: 13.8h

The month with the longest days is June (Average daylight: 15.2h).
The month with the shortest days is December (Average daylight: 9.2h).

  • Average sunshine in August: 10h

Months with the most sunshine are July and August (Average sunshine: 10h).
The month with the least sunshine is January (Average sunshine: 3.8h).

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Average sunshine days in August
Naperville, IL

Average sunshine days in August - Naperville, IL
  • Average sunshine days in August: 11.3 days

The month with the most sunshine days is November (19.6 days).
The month with the least sunshine days is July (10.2 days).

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Average UV index in August
Naperville, IL

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

Months with the highest UV index are June, July and August (UV index 6).
Months with the lowest UV index are January and December (UV index 1).

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Average cloud cover in August
Naperville, IL

Average cloud cover in August - Naperville, IL
  • Average cloud cover in August: 31

The month with the most cloud cover is January (Cloud cover 60).
Months with the least cloud cover are August and September (Cloud cover 31).

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Average visibility in August
Naperville, IL

Average visibility in August - Naperville, IL
  • Average visibility in August: 6mi

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

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