The coolest stars are the red dwarfs/red giants, with surface temperatures of 3,500 Kelvin or less. As the surface temperature gets hotter, the color of the star turns orange, and then yellow-orange, and then yellow, yellow-white, and then around 5,800 Kelvin it appears white.
In most years, Seattle averages a daily maximum temperature for September that's between 69 and 73 degrees Fahrenheit (20 to 23 degrees Celsius). The minimum temperature usually falls between 52 and 55 Â°F (11 to 13 Â°C). The days at Seattle begin to cool down quickly during September.
Guide to Seattle weather in August. The average maximum daytime temperature in Seattle in August is a warm 24Â°C (75Â°F). The average night-time temperature is usually a cool 13Â°C (55Â°F). There are usually 9 hours of bright sunshine each day, which represents 63% of the 14 hours of daylight.