Contents
- Weather in August
- Frequently asked questions
- Average temperature in August
- Average pressure in August
- Average wind speed in August
- Average humidity in August
- Average rainfall in August
- Average rainfall days in August
- Average snowfall in August
- Average snowfall days in August
- Average daylight in August
- Average sunshine in August
- Average sunshine days in August
- Average UV index in August
- Average cloud cover in August
- Average visibility in August
Weather in August
Temperature
The average high-temperature during August registers at a still warm 79.3°F (26.3°C), maintaining a close resemblance to the previous month. An average low-temperature of 66°F (18.9°C) marks the month of August.Humidity
In Riverdale, Illinois, the average relative humidity in August is 77%.Rainfall
In August, the rain falls for 11 days. Throughout August, 0.98" (25mm) of precipitation is accumulated. In Riverdale, during the entire year, the rain falls for 110.3 days and collects up to 10.31" (262mm) of precipitation.Snowfall
May through September are months without snowfall in Riverdale.Daylight
In August, the average length of the day is 13h and 48min.On the first day of August, sunrise is at 5:45 am and sunset at 8:07 pm. On the last day of the month, sunrise is at 6:16 am and sunset at 7:24 pm CDT.
Sunshine
The month with the most sunshine is August, with an average of 10.4h of sunshine.UV index
June through August, with an average maximum UV index of 6, are months with the highest UV index. A UV Index of 6 to 7 symbolizes a high health vulnerability from unsafe exposure to UV radiation for the average person.Note: A daily high UV index of 6 in August leads to these guidelines:
Apply measures and align with sun safety principles. Safeguarding against skin and eye injury is pivotal. Between 10 a.m. and 4 p.m., UV radiation is strongest. Make an effort to avoid direct sunlight during this time, remembering that shade structures may not provide full sun protection. Employ a wide-brim hat for potent defense against up to 50% of UV rays.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What is the usual temperature for Riverdale in August?
What is the average humidity in August?
How many days does it rain in August?
When it does not snow?
What is the average length of the day in August?
What time are sunrise and sunset in August?
What month has the most sunshine?
How many hours of sunshine does Riverdale have in August?
What is the month with the highest UV index?
What is the UV index intensity in August?
Average temperature in August
Riverdale, IL
- Average high temperature in August: 79.3°F
The warmest month (with the highest average high temperature) is July (80.1°F).
The month with the lowest average high temperature is January (29.8°F).
- Average low temperature in August: 66°F
The month with the highest average low temperature is July (66.9°F).
The coldest month (with the lowest average low temperature) is January (19.6°F).
Average pressure in August
Riverdale, 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
Riverdale, IL
- Average wind speed in August: 6.8mph
The windiest month (with the highest average wind speed) is January (11mph).
The calmest months (with the lowest average wind speed) are July and August (6.8mph).
Average humidity in August
Riverdale, IL
- Average humidity in August: 77%
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
Riverdale, IL
- Average rainfall in August: 0.98"
The wettest months (with the highest rainfall) are May and June (1.38").
The driest months (with the least rainfall) are February and December (0.47").
Average rainfall days in August
Riverdale, IL
- Average rainfall days in August: 11 days
The month with the highest number of rainy days is July (14 days).
The month with the least rainy days is February (4.1 days).
Average snowfall in August
Riverdale, IL
- Average snowfall in August: 0"
The month with the highest snowfall is January (1.1").
The months with the least snowfall are May, June, July, August and September (0").
Average snowfall days in August
Riverdale, IL
- Average snowfall days in August: 0 days
The month with the highest number of snowfall days is January (9.3 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
Riverdale, IL
- Average daylight in August: 13h and 5min
The month with the longest days is June (Average daylight: 15h and 6min).
The month with the shortest days is December (Average daylight: 9h and 12min).
- Average sunshine in August: 10h and 2min
The month with the most sunshine is August (Average sunshine: 10h and 24min).
The month with the least sunshine is January (Average sunshine: 3h and 36min).
Average sunshine days in August
Riverdale, IL
- Average sunshine days in August: 15.6 days
The month with the most sunshine days is December (19.8 days).
The month with the least sunshine days is June (13.1 days).
Average UV index in August
Riverdale, 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 December (UV index 1).
Average cloud cover in August
Riverdale, IL
- Average cloud cover in August: 28
The month with the most cloud cover is January (Cloud cover 62).
The month with the least cloud cover is August (Cloud cover 28).
Average visibility in August
Riverdale, 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).
Riverdale, Illinois, USA
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