August weather forecast
Naperville, IL

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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 weather in Naperville still exhibits summer conditions but with a slight dip in temperature. Although the city experiences highs of 80.1°F (26.7°C) and lows of 63.5°F (17.5°C), there is a clear hint of the approaching autumn. The landscape remains beautiful and vibrant, creating a picturesque environment for both citizens and visitors.

Temperature

Naperville's weather in August indicates an average high-temperature of a still moderately hot 80.1°F (26.7°C), nearly consistent with the 81.7°F (27.6°C) of July. In Naperville, an average low-temperature of 63.5°F (17.5°C) is recorded during August nights.

Humidity

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

Rainfall

In Naperville, during August, the rain falls for 15.3 days and regularly aggregates up to 1.81" (46mm) of precipitation. Throughout the year, in Naperville, there are 132.2 rainfall days, and 16.22" (412mm) of precipitation is accumulated.

Snowfall

May through September are months without snowfall.

Daylight

In Naperville, the average length of the day in August is 13h and 49min.
On the first day of August, sunrise is at 5:47 am and sunset at 8:10 pm. On the last day of the month, sunrise is at 6:18 am and sunset at 7:27 pm CDT.

Sunshine

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

UV index

The months with the highest UV index are June through August, with an average maximum UV index of 6. A UV Index reading of 6 to 7 represents a high threat to health from exposure to the Sun's UV rays for ordinary individuals.
Note: In August, a daily UV index of 6 turns into the following recommendations:
Take precautions against overexposure. Fair-skinned people may get burned in less than 20 minutes. Make an effort to avoid direct sun exposure between 10 a.m. and 4 p.m., the peak period for UV radiation, and note that objects like parasols or canopies might not offer full sun protection. Consider a wide-brim hat essential for effective sun defense covering your face, neck, and eyes.
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Frequently asked questions

What are the temperatures in Naperville in August?

The high-temperature in Naperville, Illinois, during August is 80.1°F (26.7°C) and the low-temperature is 63.5°F (17.5°C). The average heat index (a.k.a. 'apparent temperature', 'real feel'), which represents the influence of relative humidity on air temperature, in July is calculated to be 87.8°F (31°C).

What is the average humidity in August in Naperville?

The average relative humidity in August in Naperville, Illinois, is 79%.

How much does it rain in Naperville in August?

In August, in Naperville, the rain falls for 15.3 days. Throughout August, 1.81" (46mm) of precipitation is accumulated.

When it does not snow in Naperville?

In Naperville, Illinois, snow does not fall in May through September.

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

In August, the average day length is 13h and 49min.

When are sunrise and sunset in August in Naperville?

On the first day of August in Naperville, sunrise is at 5:47 am and sunset at 8:10 pm. On the last day of the month, sunrise is at 6:18 am and sunset at 7:27 pm CDT.

What is the month with the most sunshine in Naperville?

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

How long on average sun shines in August in Naperville?

The average sunshine duration in August is 10h.

When is the highest UV index in Naperville?

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

What is the UV index reading in August in Naperville?

In Naperville, the average daily maximum UV index in August is 6. A UV Index value of 6 to 7 symbolizes a high health threat from unprotected exposure to UV radiation.
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
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"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
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%

The 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").
The 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).
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
Naperville, IL

Average daylight in August / Average sunshine in August - Naperville, IL
  • Average daylight in August: 13h and 5min

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 12min).

  • 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 48min).

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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

The months with the highest UV index are June, July and 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
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).
The 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

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

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Naperville, Illinois, USA

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