August weather forecastGlen Ellyn, IL
August
Weather in August
The last month of the summer, August, is another warm month in Glen Ellyn, Illinois, with an average temperature varying between 80.4°F (26.9°C) and 64°F (17.8°C).Temperature
Glen Ellyn signifies an average high-temperature of a still warm 80.4°F (26.9°C) in August, closely mirroring the 81.7°F (27.6°C) of July. In Glen Ellyn, an average nighttime temperature of 64°F (17.8°C) is expected during August.Humidity
The average relative humidity in August is 77%.Rainfall
In Glen Ellyn, during August, the rain falls for 17.9 days and regularly aggregates up to 3.35" (85mm) of precipitation. Throughout the year, there are 164.3 rainfall days, and 33.78" (858mm) of precipitation is accumulated.Snowfall
June through September are months without snowfall.Daylight
In August, the average length of the day in Glen Ellyn is 13h and 49min.On the first day of August in Glen Ellyn, sunrise is at 5:46 am and sunset at 8:10 pm. On the last day of the month, sunrise is at 6:17 am and sunset at 7:26 pm CDT.
Sunshine
The month with the most sunshine in Glen Ellyn, Illinois, is August, with an average of 9.9h 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 of 6 to 7 symbolizes a high health risk from unsafe exposure to UV radiation for average individuals.Note: A typical high UV index of 6 in August suggests the following recommendations:
Endorse precautions and be consistent with sun safety guidelines. Preventing sunburn is paramount. Between 10 a.m. and 4 p.m., the Sun emits the most powerful UV radiation. Limit direct exposure to the Sun during these hours. Always opt for UVA and UVB-resistant sunglasses on radiant days.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in August
Glen Ellyn, IL
- Average high temperature in August: 80.4°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°F).
- Average low temperature in August: 64°F
The month with the highest average low temperature is July (65.3°F).
The coldest month (with the lowest average low temperature) is January (16.7°F).
Average pressure in August
Glen Ellyn, 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
Glen Ellyn, IL
- Average wind speed in August: 6mph
The windiest month (with the highest average wind speed) is January (9.8mph).
The calmest month (with the lowest average wind speed) is August (6mph).
Average humidity in August
Glen Ellyn, IL
- Average humidity in August: 77%
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
Glen Ellyn, IL
- Average rainfall in August: 3.35"
The wettest month (with the highest rainfall) is May (4.45").
The driest months (with the least rainfall) are November and December (1.65").
Average rainfall days in August
Glen Ellyn, IL
- Average rainfall days in August: 17.9 days
The month with the highest number of rainy days is July (20.1 days).
The month with the least rainy days is February (5.8 days).
Average snowfall in August
Glen Ellyn, IL
- Average snowfall in August: 0"
The month with the highest snowfall is January (5.87").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in August
Glen Ellyn, IL
- Average snowfall days in August: 0 days
The month with the highest number of snowfall days is January (13.1 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in August /
Average sunshine in August
Glen Ellyn, 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: 9h and 54min
The month with the most sunshine is August (Average sunshine: 9h and 54min).
The month with the least sunshine is January (Average sunshine: 3h and 42min).
Average sunshine days in August
Glen Ellyn, IL
- Average sunshine days in August: 9.3 days
The month with the most sunshine days is November (16.1 days).
The month with the least sunshine days is July (8.2 days).
Average UV index in August
Glen Ellyn, IL
- Average UV index in August: 6
The months with the highest UV index are June, July and August (UV index 6).
The month with the lowest UV index is January (UV index 1).
Average cloud cover in August
Glen Ellyn, IL
- Average cloud cover in August: 32
The month with the most cloud cover is January (Cloud cover 61).
The months with the least cloud cover are August and September (Cloud cover 32).
Average visibility in August
Glen Ellyn, 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).
