Are you considering a trip to Seattle in August? Well, the weather is usually on your side with an average maximum temperature of +24°C and about 9 sunny days. Just keep in mind that there may be some rain, with an average of 9 rainy days and 29 mm of precipitation. Expect good weather and pack accordingly to enjoy the outdoors. Search flightsin one click on Avionero.
Good to know:
August is usually the hottest month of the year in Seattle;
Average weather
☀️
+24°C
Avg. max. temperature
+8°C
Min.
+36°C
Max.
29 mm
Total precipitation
71%
Avg. humidity
1 m/s
Avg. wind
9 ☀️
Sunny Days
13 ⛅️
Cloudy
9 🌦
Rainy
Our opinion: Seattle has good weather in August.
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Average temperature in Seattle in August
Here are the expected maximum, average and minimum temperatures in Seattle for August based on the historical data.
Last Year
Historical Data
The temperature in August is +27°C on average, with a range between a maximum of +33°C during the day and a minimum of +13°C at night.
The average maximum temperature goes down 20% by the end of the month, compared with the beginning of the month, from +26°C to +22°C.
Is Seattle warm or cold in August?
Seattle is typically warm in August.
Maximum temperatures go up compared to the previous month from +24°C to +24°C. The minimum temperature also goes up from +14°C to +14°C.
It’s generally warm, but pack a long-sleeve shirt for evenings.
August is the hottest month in Seattle, here is the comparison with other months:
Water temperature in Seattle in August
Water in Seattle in August is Cold. It varies from +11°C to +13°C, with an average of +12°C.The air temperature averaging +24°C is higher than the water temperature.
The water temperature in August is one of the warmest of the entire year:
The warmest water temperatures in Seattle are reached in August, when the average sea temperature rises to +12°C. The coldest water temperatures are in February, with an average of +7°C.
Can you swim in Seattle in August?
We would not recommend swimming in Seattle in August, the water is very cold (+12°C on average). Consider swimming only if you are an experienced cold-water swimmer with proper gear.
🦭
Cold
Below +16°C
🏄♂️
Fresh
16°C - 21°C
🏊
Comfortable
21°C - 25°C
👙
Warm
25°C - 28°C
🔥
Very warm
+28°C and up
You will need a full-body wetsuit, cap, gloves, a warm change of clothes, and a hot drink ready for after your swim.
Climate in Seattle in August
Seattle weather looks like this, on average, in August and the surrounding months.
July
August
September
Avg. temperature
+24°C
+24°C
+21°C
Min. temperature
+9°C
+8°C
+5°C
Max. temperature
+35°C
+36°C
+33°C
Rainfall
28 mm
29 mm
62 mm
Wind
1 m/s
1 m/s
1 m/s
Avg. water temperature
+10°C
+12°C
+12°C
Humidity
70%
71%
76%
Air pressure
1016 HPa
1015 HPa
1015 HPa
Sunny days
10
9
7
Cloudy days
12
13
10
Rainy days
9
9
13
Snowy days
0
0
0
August weather is still as good as in July.The temperature levels stay the same in the area of +24°C for average maximum temperature during the day.Prepare for more rain. Average rainfall goes from 28 mm to 29 mm.Humidity rises from 70% to 71%.The average wind speed doesn’t change much during August, staying around 1 m/s.The days becoming less sunny, going from 10 sunny days in July to 9 in August.
Next month (September) brings a further decline in the weather.
Wind speed in Seattle in August based on historical data.
Last Year
Historical Data
The average wind speed is 1 m/s getting up to 2 m/s which is a light breeze; barely moving the tree leaves.
The average wind speed in Seattle is gradually increasing during August, going from 1 m/s to 1 m/s over the course of the month.
Rain
Amount of rainfall in mm during August in Seattle based on historical data.
Last Year
Historical Data
A chance of rain on a typical day in August stands at 26%, leading to total precipitation of around 41 mm. The maximum amount of rainfall per day is around 12 mm, which is considered light rain.On average, there are about 8 rainy days during August, so prepare to bring an umbrella.
Here’s how August is compared with other months in the amount of precipitation, total mm:
Seattle wettest month is November, where a typical day has a 70% chance of precipitation and 177 mm of rainfall per day. July, on the other hand, is the driest month with a mere 29% chance of precipitation and 28 mm of rainfall per day.
How was the weather last August in Seattle?
This is the weather in Seattle in August 2024:
1 August
☀️
+26°C
2 August
☀️
+28°C
3 August
☀️
+28°C
4 August
☀️
+28°C
5 August
☁️
+27°C
6 August
☁️
+23°C
7 August
🌧️
+25°C
8 August
☁️
+24°C
9 August
☀️
+25°C
10 August
🌧️
+25°C
11 August
☁️
+25°C
12 August
☁️
+27°C
13 August
☀️
+30°C
14 August
☀️
+33°C
15 August
☀️
+33°C
16 August
☀️
+33°C
17 August
☀️
+33°C
18 August
☁️
+32°C
19 August
☀️
+24°C
20 August
☀️
+26°C
21 August
☀️
+25°C
22 August
☁️
+23°C
23 August
☁️
+22°C
24 August
☀️
+24°C
25 August
☀️
+28°C
26 August
☀️
+30°C
27 August
☀️
+29°C
28 August
☁️
+28°C
29 August
🌧️
+20°C
30 August
🌧️
+22°C
31 August
☁️
+22°C
In August 2024 Seattle had 17 sunny days, 10 cloudy days, and 4 rainy days. The average maximum temperature was +27°C, with an absolute maximum of +33°C and a minimum of +20°C. The average humidity was 71%, with a maximum of 97% and a minimum of 40%. The average wind speed was 1 m/s, with a maximum of 5 m/s and a minimum of 0 m/s.
Are you planning a trip in August?
Climate Change over Years
This is how Seattle climate have been changing during last 43 years period.
The climate in Seattle in August has not changed much over the last 43 years.
The average temperature was the lowest in 2011 (+14°C) and the highest in 2014 (+17°C). The driest year was 1985 with only 714 mm of rainfall, and the wettest year was 2021 with 2549 mm.
FAQ
Frequently asked questions about the weather in Seattle in August:
Is August a good time to visit Seattle?
August is a really good time to go to Seattle. The weather is nice so plan your packing around outdoor activities and exploring. Check out other good time to visit Seattle.
Can you sunbathe in Seattle in August?
August is warm in Seattle. You may enjoy some beach or pool time in the day, but pack something a tad warmer for the evening.
Can you swim in Seattle in August?
Swimming in Seattle in August is challenging and not recommended for inexperienced swimmers or without proper equipment and preparation.
Is Seattle rainy in August?
Seattle is usually dry in August. Plan your packing around outdoor activities and exploring.
Is it sunny in Seattle in August?
Usually, it’s not very sunny in Seattle in August, often it’s pretty cloudy. Pack for any eventuality; layering can help reduce the number of bulky items needed.
For this page, we’ve looked at the typical weather in Seattle, based on historical hourly weather data from January 1, 1979, to December 31, 2023.
For past dates, we show actual recorded data at the location at that time. Forecasts are based on recorded weather during that day of the year, averaged over the total years for which we have records (unless stated otherwise). The daily temperature is the highest recorded temperature in the shadow during that day.
