August weather forecastRiverside, IL
August
Weather in August
August, the last month of the summer in Riverside, is also a moderately hot month, with an average temperature ranging between min 66.7°F (19.3°C) and max 79.3°F (26.3°C).Temperature
August's weather displays an average high-temperature of a still moderately hot 79.3°F (26.3°C), slightly varied from July's 80.4°F (26.9°C). Riverside, in August, observes a steady average low-temperature of 66.7°F (19.3°C).Humidity
In August, the average relative humidity in Riverside, Illinois, is 75%.Rainfall
In Riverside, in August, during 9.5 rainfall days, 0.63" (16mm) of precipitation is typically accumulated. In Riverside, during the entire year, the rain falls for 92 days and collects up to 7.4" (188mm) of precipitation.Snowfall
In Riverside, snow does not fall in May through September.Daylight
The average length of the day in August is 13h and 49min.On the first day of the month, sunrise is at 5:46 am and sunset at 8:09 pm. On the last day of August, in Riverside, sunrise is at 6:16 am and sunset at 7:25 pm CDT.
Sunshine
The month with the most sunshine is August, with an average of 10.6h of sunshine.UV index
June through August, with an average maximum UV index of 6, are months with the highest UV index in Riverside. A UV Index of 6 to 7 symbolizes a high threat to health from exposure to the Sun's UV rays for ordinary individuals.Note: A daily maximum UV index of 6 in August translates into the following instructions:
Stand by precautions and apply sun safety measures. Evading sunburn is of great importance. The time between 10 a.m. and 4 p.m. is when UV radiation is at its peak. Limit exposure to direct sunlight during these hours. To cut down UV radiation exposure by about half, sport a wide-brim hat.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in August
Riverside, IL
- Average high temperature in August: 79.3°F
The warmest month (with the highest average high temperature) is July (80.4°F).
The month with the lowest average high temperature is January (29.1°F).
- Average low temperature in August: 66.7°F
The month with the highest average low temperature is July (67.1°F).
The coldest month (with the lowest average low temperature) is January (19.2°F).
Average pressure in August
Riverside, 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
Riverside, IL
- Average wind speed in August: 6.8mph
The windiest month (with the highest average wind speed) is January (10.9mph).
The calmest month (with the lowest average wind speed) is August (6.8mph).
Average humidity in August
Riverside, IL
- Average humidity in August: 75%
The months with the highest relative humidity are January and February (82%).
The month with the lowest relative humidity is October (72%).
Average rainfall in August
Riverside, IL
- Average rainfall in August: 0.63"
The wettest month (with the highest rainfall) is May (1.1").
The driest months (with the least rainfall) are February, March, November and December (0.39").
Average rainfall days in August
Riverside, IL
- Average rainfall days in August: 9.5 days
The month with the highest number of rainy days is June (11.7 days).
The month with the least rainy days is January (3.1 days).
Average snowfall in August
Riverside, IL
- Average snowfall in August: 0"
The month with the highest snowfall is February (1.38").
The months with the least snowfall are May, June, July, August and September (0").
Average snowfall days in August
Riverside, IL
- Average snowfall days in August: 0 days
The month with the highest number of snowfall days is February (7.3 days).
The months with the least snowfall days are May, June, July, August and September (0 days).
Average daylight in August /
Average sunshine in August
Riverside, 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 36min
The month with the most sunshine is August (Average sunshine: 10h and 36min).
The month with the least sunshine is January (Average sunshine: 3h and 48min).
Average sunshine days in August
Riverside, IL
- Average sunshine days in August: 17.2 days
The month with the most sunshine days is December (23.7 days).
The month with the least sunshine days is June (14.3 days).
Average UV index in August
Riverside, 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
Riverside, IL
- Average cloud cover in August: 27
The month with the most cloud cover is January (Cloud cover 61).
The month with the least cloud cover is August (Cloud cover 27).
Average visibility in August
Riverside, 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).
