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 sea temperature 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
In Seattle, the peak temperatures are generally noted in August, averaging a high of 76.3°F (24.6°C) and a low of 54°F (12.2°C).Humidity
In Seattle, the average relative humidity in August is 70%.Rainfall
July and August are months with the least rain when the rain falls for 2.8 days and typically aggregates up to 0.12" (3mm) of rain.Snowfall
April through October and December are months without snowfall.Ocean temperature
With an average ocean temperature of 53.6°F (12°C), August is the month with the warmest seawater.Note: It is life-risking to swim in 53.6°F (12°C). Briefly staying in 55.4°F (13°C) waters feels unsettling, and temperatures below 50°F (10°C) might result in cold shock and loss of breath control, hinging on personal endurance.
Daylight
In Seattle, Washington, the average length of the day in August is 14h and 12min.On the first day of the month, sunrise is at 5:48 am and sunset at 8:43 pm. On the last day of August, sunrise is at 6:27 am and sunset at 7:50 pm PDT.
Sunshine
With an average of 10.7h of sunshine, August has the most sunshine of the year in Seattle, Washington.UV index
In August, the average daily maximum UV index in Seattle is 4. A UV Index reading of 3 to 5 represents a moderate health risk from unsafe exposure to UV radiation for the average person.Note: A maximum UV index of 4 in August translates into the following recommendations:
Heed the precautions - Protecting the skin and eyes from damage is compulsory. Midday is the peak time for the Sun's radiation; stay in the shade and protect yourself. Shield yourself from the harmful effects of UV radiation with sun-protective attire, a hat, and quality sunglasses.
Frequently asked questions
What month is the hottest in Seattle?
What are the temperatures in Seattle in August?
What is the average humidity in August in Seattle?
What is the driest month in Seattle?
How much does it rain in Seattle in August?
When it does not snow in Seattle?
What is the month with the warmest ocean in Seattle?
What is the water temperature in August in Seattle?
What is the average length of the day in August in Seattle?
When are sunrise and sunset in August in Seattle?
What month has the most sunshine in Seattle?
How many hours of sunshine does Seattle have in August?
What is the UV index reading in August in Seattle?
Average temperature in August
Seattle, WA
- Average high temperature in August: 76.3°F
The warmest month (with the highest average high temperature) is August (76.3°F).
The month with the lowest average high temperature is December (43.7°F).
- Average low temperature in August: 54°F
The month with the highest average low temperature is August (54°F).
The coldest month (with the lowest average low temperature) is December (35.1°F).
Average pressure in August
Seattle, WA
- Average pressure in August: 30.01"Hg
The month with the highest atmospheric pressure is January (30.1"Hg).
The months with the lowest atmospheric pressure are March, August and September (30.01"Hg).
Average wind speed in August
Seattle, WA
- Average wind speed in August: 3.5mph
The windiest month (with the highest average wind speed) is March (5.3mph).
The calmest months (with the lowest average wind speed) are July and August (3.5mph).
Average humidity in August
Seattle, WA
- Average humidity in August: 70%
The month with the highest relative humidity is January (85%).
The month with the lowest relative humidity is July (69%).
Average rainfall in August
Seattle, WA
- Average rainfall in August: 0.12"
The wettest month (with the highest rainfall) is December (0.87").
The driest months (with the least rainfall) are July and August (0.12").
Average rainfall days in August
Seattle, WA
- Average rainfall days in August: 2.8 days
The month with the highest number of rainy days is November (9.1 days).
The month with the least rainy days is August (2.8 days).
Average snowfall in August
Seattle, WA
- Average snowfall in August: 0"
The month with the highest snowfall is February (0.71").
The months with the least snowfall are April, May, June, July, August, September, October and December (0").
Average snowfall days in August
Seattle, WA
- Average snowfall days in August: 0 days
The month with the highest number of snowfall days is February (1.9 days).
The months with the least snowfall days are May, June, July, August, September and October (0 days).
Average sea temperature in August
Seattle, WA
- Average sea temperature in August: 53.5°F
The best month for swimming (with the highest average sea temperature) is August (53.5°F).
The coldest month (with the lowest average sea temperature) is February (45.3°F).
Average daylight in August /
Average sunshine in August
Seattle, WA
- Average daylight in August: 14h and 1min
The month with the longest days is June (Average daylight: 15h and 54min).
The month with the shortest days is December (Average daylight: 8h and 30min).
- Average sunshine in August: 10h and 4min
The month with the most sunshine is August (Average sunshine: 10h and 42min).
The month with the least sunshine is December (Average sunshine: 4h and 18min).
Average sunshine days in August
Seattle, WA
- Average sunshine days in August: 25.9 days
The month with the most sunshine days is August (25.9 days).
The month with the least sunshine days is November (16.8 days).
Average UV index in August
Seattle, WA
- Average UV index in August: 4
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
Seattle, WA
- Average cloud cover in August: 25
The month with the most cloud cover is December (Cloud cover 56).
The month with the least cloud cover is August (Cloud cover 25).
Average visibility in August
Seattle, WA
- Average visibility in August: 6mi
The months with the highest visibility are April, May, June, July, August, September and October (6mi).
The months with the lowest visibility are January, February, March, November and December (5mi).
Seattle, Washington, USA
Weather forecast for your location
2. Allow the app to use your location