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
August is the month when Portland experiences its warmest temperatures, averaging a high of 81.5°F (27.5°C) and a low of 55°F (12.8°C).Heat index
During August, the heat index is estimated at 84.2°F (29°C). If one remains active during constant exposure, it might cause exhaustion and heat cramps.The standards for the heat index are set for locations in shade and under light breezes. In the presence of direct sunshine, the heat index could be augmented by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'felt air temperature' or 'apparent temperature', is the outcome of merging air's temperature and its humidity metrics. A person's impression of weather can be shaped by several aspects, among them metabolic variations, pregnancy, and levels of physical activity. Exposure to direct sun rays can influence the heat you feel, pushing the heat index up by 15 Fahrenheit (8 Celsius) degrees. Heat index values are highly important for children. Children often do not understand the need to rest and hydrate. Thirst is a late manifestation of dehydration - therefore, it is essential to stay hydrated, particularly during prolonged physical activities.
Humidity
The least humid month in Portland is August, with an average relative humidity of 63%.Rainfall
In Portland, in August, during 5.2 rainfall days, 0.39" (10mm) of precipitation is typically accumulated. In Portland, during the entire year, the rain falls for 173.1 days and collects up to 31.18" (792mm) of precipitation.Snowfall
April through October are months without snowfall in Portland.Daylight
In August, the average length of the day in Portland is 14h and 3min.On the first day of the month, sunrise is at 5:55 am and sunset at 8:38 pm. On the last day of August, in Portland, sunrise is at 6:31 am and sunset at 7:49 pm PDT.
Sunshine
With an average of 10.9h of sunshine, August has the most sunshine of the year in Portland.UV index
In Portland, the average daily maximum UV index in August is 5. A UV Index estimate of 3 to 5 represents a moderate health risk from unprotected exposure to Sun's UV rays for the ordinary person.Note: In August, an average UV index of 5 transforms into the following instructions:
Exercise prevention - Protecting skin and eyes from harm is required. Direct Sun exposure should be minimized especially during midday when radiation is most intense. Arm yourself against UV rays' harm with protective apparel and UV-filtering shades.
Frequently asked questions
What are the warmest months in Portland?
What are August temperatures in Portland?
What is the least humid month in Portland?
What is the average humidity in August in Portland?
How much does it rain in Portland in August?
When it does not snow in Portland?
What is the average length of the day in August in Portland?
When are sunrise and sunset in August in Portland?
What month has the most sunshine in Portland?
How many hours of sunshine does Portland have in August?
How high is the UV index in August in Portland?
Average temperature in August
Portland, OR
- Average high temperature in August: 81.5°F
The warmest month (with the highest average high temperature) is August (81.5°F).
The month with the lowest average high temperature is December (44.1°F).
- Average low temperature in August: 55°F
The month with the highest average low temperature is August (55°F).
The coldest month (with the lowest average low temperature) is December (34.7°F).
Average pressure in August
Portland, OR
- Average pressure in August: 30"Hg
The month with the highest atmospheric pressure is January (30.12"Hg).
The month with the lowest atmospheric pressure is August (30"Hg).
Average wind speed in August
Portland, OR
- Average wind speed in August: 3.9mph
The windiest month (with the highest average wind speed) is January (5.8mph).
The calmest month (with the lowest average wind speed) is August (3.9mph).
Average humidity in August
Portland, OR
- Average humidity in August: 63%
The months with the highest relative humidity are January, February and December (83%).
The month with the lowest relative humidity is August (63%).
Average rainfall in August
Portland, OR
- Average rainfall in August: 0.39"
The wettest month (with the highest rainfall) is December (4.53").
The driest month (with the least rainfall) is July (0.31").
Average rainfall days in August
Portland, OR
- Average rainfall days in August: 5.2 days
The month with the highest number of rainy days is March (20.4 days).
The month with the least rainy days is July (4.9 days).
Average snowfall in August
Portland, OR
- Average snowfall in August: 0"
The month with the highest snowfall is March (1.5").
The months with the least snowfall are April, May, June, July, August, September and October (0").
Average snowfall days in August
Portland, OR
- Average snowfall days in August: 0 days
The month with the highest number of snowfall days is February (2.3 days).
The months with the least snowfall days are May, June, July, August, September and October (0 days).
Average daylight in August /
Average sunshine in August
Portland, OR
- Average daylight in August: 14h and 1min
The month with the longest days is June (Average daylight: 15h and 36min).
The month with the shortest days is December (Average daylight: 8h and 48min).
- Average sunshine in August: 10h and 5min
The month with the most sunshine is August (Average sunshine: 10h and 54min).
The month with the least sunshine is January (Average sunshine: 4h and 6min).
Average sunshine days in August
Portland, OR
- Average sunshine days in August: 23.8 days
The months with the most sunshine days are July and August (23.8 days).
The month with the least sunshine days is March (8.3 days).
Average UV index in August
Portland, OR
- Average UV index in August: 5
The month with the highest UV index is July (UV index 6).
The months with the lowest UV index are January, February, November and December (UV index 2).
Average cloud cover in August
Portland, OR
- Average cloud cover in August: 23
The month with the most cloud cover is February (Cloud cover 58).
The month with the least cloud cover is August (Cloud cover 23).
Average visibility in August
Portland, OR
- Average visibility in August: 6mi
The months with the highest visibility are July, August and September (6mi).
The months with the lowest visibility are January, February, March, April, May, June, October, November and December (5mi).
Portland, Oregon, USA
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