August weather forecastRoselle, IL
August
Weather in August
The last month of the summer, August, is another warm month in Roselle, Illinois, with temperature in the range of an average high of 80.2°F (26.8°C) and an average low of 64.2°F (17.9°C).Temperature
August's onset sees an average high-temperature of a still moderately hot 80.2°F (26.8°C), exhibiting a slight fluctuation from the previous month. August in Roselle sees the temperature falling to a mean low of 64.2°F (17.9°C).Humidity
In August, the average relative humidity is 76%.Rainfall
In Roselle, Illinois, in August, during 16.3 rainfall days, 2.76" (70mm) of precipitation is typically accumulated. Throughout the year, there are 147.4 rainfall days, and 24.69" (627mm) of precipitation is accumulated.Snowfall
June through September are months without snowfall in Roselle.Daylight
In August, the average length of the day in Roselle is 13h and 49min.On the first day of August in Roselle, 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 7:27 pm CDT.
Sunshine
In August, the average sunshine in Roselle is 9.8h.UV index
June through August, with an average maximum UV index of 6, are months with the highest UV index. A UV Index reading of 6 to 7 represents a high threat to health from unprotected exposure to Sun's UV rays for ordinary individuals.Note: The UV index of 6 during August translates into the following guidance:
Continue precautions and advocate sun safety advice. Deterrence of sunburn is indispensable. The Sun emits the most powerful UV radiation between 10 a.m. and 4 p.m. Try to avoid direct sunlight during this period. It's wise to wear UVA and UVB-blocking sunglasses when the sun shines brightly.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in August
Roselle, IL
- Average high temperature in August: 80.2°F
The warmest month (with the highest average high temperature) is July (81.9°F).
The month with the lowest average high temperature is January (27.9°F).
- Average low temperature in August: 64.2°F
The month with the highest average low temperature is July (65.7°F).
The coldest month (with the lowest average low temperature) is January (16.5°F).
Average pressure in August
Roselle, 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
Roselle, IL
- Average wind speed in August: 6.2mph
The windiest month (with the highest average wind speed) is January (9.9mph).
The calmest month (with the lowest average wind speed) is August (6.2mph).
Average humidity in August
Roselle, IL
- Average humidity in August: 76%
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
Roselle, IL
- Average rainfall in August: 2.76"
The wettest month (with the highest rainfall) is May (3.11").
The driest month (with the least rainfall) is December (1.14").
Average rainfall days in August
Roselle, IL
- Average rainfall days in August: 16.3 days
The month with the highest number of rainy days is July (17.8 days).
The month with the least rainy days is February (4.9 days).
Average snowfall in August
Roselle, IL
- Average snowfall in August: 0"
The month with the highest snowfall is February (4.02").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in August
Roselle, 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
Roselle, 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 48min
The month with the most sunshine is July (Average sunshine: 10h and 0min).
The month with the least sunshine is January (Average sunshine: 3h and 36min).
Average sunshine days in August
Roselle, IL
- Average sunshine days in August: 10.9 days
The month with the most sunshine days is November (17.2 days).
The month with the least sunshine days is July (10.2 days).
Average UV index in August
Roselle, 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
Roselle, IL
- Average cloud cover in August: 33
The month with the most cloud cover is January (Cloud cover 62).
The months with the least cloud cover are July, August and September (Cloud cover 33).
Average visibility in August
Roselle, 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).
