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.
May weather in Seattle: May is generally a beautiful month in Seattle, with temperatures into the late teens and more days of sun and blue skies than rain. Even so, the evenings in May are chilly, and periods of rain are not uncommon, so a jacket and an umbrella are still a good idea. (Average Max Temperature: 18.2Â°C.