August weather forecastNaperville, IL
August
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 signifies an average high-temperature of a still moderately hot 80.1°F (26.7°C) in August, closely mirroring the 81.7°F (27.6°C) of July. An average nighttime temperature of 63.5°F (17.5°C) is observed in Naperville during August.Humidity
The average relative humidity in August 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, there are 132.2 rainfall days, and 16.22" (412mm) of precipitation is accumulated.Snowfall
May through September are months without snowfall.Daylight
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
July and August, with an average of 10h of sunshine, are months with the most 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 health risk from exposure to the Sun's UV rays for the average person.Note: In August, a daily maximum UV index of 6 leads to the following instructions:
Persist with safeguards and heed sun safety doctrines. Keeping sunburn at bay is of prime importance. Avoid direct Sun exposure and stay in the shade between 10 a.m. and 4 p.m., a time when UV radiation is most intense, noting that not all shade structures offer full protection. A hat with a generous brim can prevent nearly 50% of UV rays from reaching your eyes.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
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).
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).
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).
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%).
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").
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).
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").
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).
Average daylight in August /
Average sunshine in August
Naperville, 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 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).
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).
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).
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).
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).
