Seattle Weather in August
August in Seattle typically sees daytime highs of 25°C (77°F) and nighttime lows of 14°C (57°F). Expect some rainfall during the month. It falls within the summer season.
Rainfall in Seattle in August
The climate data from previous years indicates about 4 days of rain, averaging 23 mm (0.9 in) for the month. When rain does fall, showers tend to be light and brief. Most days will be dry.
Temperature in Seattle in August
The temperature in Seattle in August is perfect. Daytime highs reach 25°C (77°F), with nights dropping to 14°C (57°F). During August, the summer season is in full swing. The days can feel warmer than the evenings, so packing for both parts of the day is a good idea. Nights drop to around 14°C (57°F), which is noticeably cooler than the daytime. A light jacket for the evening is a sensible addition, and the cool nights tend to make sleeping comfortable. On average, it is the warmest month of the year.
Sunshine in Seattle in August
The days are predominantly sunny, with an estimated total of around 280 hours of sunshine. These sun-filled days are perfect for playing sports, visiting parks, or going for a bike ride.
Wind Speed in Seattle in August
In August, average wind speeds reach 4 m/s (8 knots), leading to light to moderate breezes. Conditions vary from day to day, with both calm and windier periods.So this is a great month to visit if you prefer dry days with pleasant temperatures.
Check the conditions for any month of the year.
For a detailed overview over the year and the best time to visit the United States of America, check out our Seattle's climate page.
Seattle Temperature in August
Min Temperature
14°C (57°F)
Max Temperature
25°C (77°F)
Chance of Rain
14%
Precipitation
23 mm (0.9 in)
Rainy days
4 days
Humidity
68%
Windspeed
4 m/s (8 knots)
Sunshine
280 hours
Percentage Sunshine
64%
Daily Historical Temperatures
50-year average (1976-2025)
Based on our historical records, temperatures in Seattle typically stay consistent throughout August, with daily highs averaging around 25°C (77°F). Nights are cool, with lows around 14°C (57°F).
Average temperatures in August
Daily Historical Precipitation
50-year average (1976-2025)
Average daily rainfall for each day of the month based on long-term records.
Average precipitation in August
Historical weather for Seattle in August
Browse day-by-day weather records for Seattle spanning 51 years. Select any month and year to see actual temperatures, rainfall, and conditions recorded on each day.
Seattle historical weather extremes in August
Based on weather observations in Seattle between 1976 and 2025, these are the recorded extremes during August.
- On August 9, 1981, temperatures climbed to 37°C (99°F), marking the warmest August day on record.
- The lowest daytime temperature in August was 15°C (59°F), recorded on August 31, 2010.
- Nighttime temperatures dropped to 8°C (46°F) on August 29, 1980, marking the coldest August night on record.
Best Places in the United States of America in August
Find out more about the weather in the United States of America and which places have the best travel conditions in this month. See all of the United States of America in August →
perfect weather
pleasant
tolerable
unpleasant
poor
What to Wear in Seattle in August
Warm weather calls for comfortable, breathable clothing in August. Cotton t-shirts, shorts, light dresses, and sandals are perfect. You might still want a light layer for evenings or air-conditioned places (for example buses). Some rain is possible, so pack something to handle light showers. And with plenty of sunshine hours, don’t forget sunglasses, sunscreen, and maybe a sun hat.What To Do in Seattle in August
We rated the following activities from 1 (least suitable) to 10 (best) to do.
Check the conditions for any month of the year.
For a detailed overview over the year and the best time to visit the United States of America, check out our Seattle's climate page.
Temperature Rainfall Sunshine Humidity Wind Speed
See the full Seattle climate overview or explore weather in the United States of America.
