average temperatures for august in seattle
14 Â°C. In most years, Seattle averages a daily maximum temperature for August that's between 74 and 78 degrees Fahrenheit (24 to 26 degrees Celsius). The minimum temperature usually falls between 56 and 58 Â°F (13 to 15 Â°C). August is Seattle's hottest month overall, with temperatures peaking from the 1st and 4th.