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
As July transitions into August, the average high-temperature rests at a still moderately hot 81.9°F (27.7°C), maintaining a close resemblance to the previous month. Despite the hot August days, Riley's nights see an average temperature plunge to a moderate 58.1°F (14.5°C).Humidity
The months with the lowest humidity are July and August, with an average relative humidity of 33%.Rainfall
In Riley, in August, during 3.3 rainfall days, 0.2" (5mm) of precipitation is typically accumulated. Throughout the year, there are 125.1 rainfall days, and 11.26" (286mm) of precipitation is accumulated.Snowfall
In Riley, snow does not fall in April through October.Daylight
In Riley, the average length of the day in August is 13h and 55min.On the first day of the month, sunrise is at 5:48 am and sunset at 8:20 pm. On the last day of August, sunrise is at 6:21 am and sunset at 7:34 pm PDT.
Sunshine
In August, the average sunshine is 11.9h.UV index
In August, the average daily maximum UV index is 5. A UV Index reading of 3 to 5 represents a medium vulnerability from exposure to the Sun's UV rays for the average person.Note: The maximum daily UV index, 5 in August, converts into the following recommendations:
Be vigilant - A duty to shield skin and eyes from injury exists. The Sun's harshest UV rays are around midday; it's wise to seek shade and limit time outdoors. A wide-brimmed hat provides unparalleled sun protection for sensitive areas like the eyes, ears, and neck.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What are August temperatures?
What is the least humid month?
What is the average humidity in August?
How many days does it rain in August?
When it does not snow?
How many hours of daylight does Riley have in August?
When is the sunrise / sunset in August?
How long on average sun shines in August?
What is the UV index intensity in August?
Average temperature in August
Riley, OR
- Average high temperature in August: 81.9°F
The warmest month (with the highest average high temperature) is July (82.9°F).
The month with the lowest average high temperature is December (33.1°F).
- Average low temperature in August: 58.1°F
The month with the highest average low temperature is August (58.1°F).
The coldest month (with the lowest average low temperature) is December (21.2°F).
Average pressure in August
Riley, OR
- Average pressure in August: 29.94"Hg
The month with the highest atmospheric pressure is January (30.22"Hg).
The month with the lowest atmospheric pressure is August (29.94"Hg).
Average wind speed in August
Riley, OR
- Average wind speed in August: 7.5mph
The windiest month (with the highest average wind speed) is April (9.9mph).
The calmest month (with the lowest average wind speed) is August (7.5mph).
Average humidity in August
Riley, OR
- Average humidity in August: 33%
The month with the highest relative humidity is December (83%).
The months with the lowest relative humidity are July and August (33%).
Average rainfall in August
Riley, OR
- Average rainfall in August: 0.2"
The wettest month (with the highest rainfall) is December (1.54").
The driest month (with the least rainfall) is July (0.16").
Average rainfall days in August
Riley, OR
- Average rainfall days in August: 3.3 days
The month with the highest number of rainy days is March (17.7 days).
The month with the least rainy days is August (3.3 days).
Average snowfall in August
Riley, OR
- Average snowfall in August: 0"
The month with the highest snowfall is December (0.87").
The months with the least snowfall are April, May, June, July, August, September and October (0").
Average snowfall days in August
Riley, OR
- Average snowfall days in August: 0 days
The month with the highest number of snowfall days is December (3.1 days).
The months with the least snowfall days are April, May, June, July, August, September and October (0 days).
Average daylight in August /
Average sunshine in August
Riley, OR
- Average daylight in August: 13h and 5min
The month with the longest days is June (Average daylight: 15h and 24min).
The month with the shortest days is December (Average daylight: 9h and 0min).
- Average sunshine in August: 11h and 5min
The month with the most sunshine is July (Average sunshine: 12h and 6min).
The month with the least sunshine is December (Average sunshine: 5h and 12min).
Average sunshine days in August
Riley, OR
- Average sunshine days in August: 25.3 days
The months with the most sunshine days are July and August (25.3 days).
The month with the least sunshine days is March (11.5 days).
Average UV index in August
Riley, OR
- Average UV index in August: 5
The month with the highest UV index is July (UV index 7).
The months with the lowest UV index are January, February, March, November and December (UV index 2).
Average cloud cover in August
Riley, OR
- Average cloud cover in August: 9
The month with the most cloud cover is December (Cloud cover 47).
The months with the least cloud cover are July and August (Cloud cover 9).
Average visibility in August
Riley, OR
- Average visibility in August: 6mi
The months with the highest visibility are February, March, April, May, June, July, August, September, October, November and December (6mi).
The month with the lowest visibility is January (5mi).
Riley, Oregon, USA
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