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.
September was a fairly dry month in Seattle, with just half the normal precipitation. More noteworthy, however, was the monthâs average temperature, which ended up 0.8 degrees below normal.That broke an 18-month stretch of warmer-than-normal months in Seattle, dating back to March 2014.eptember was a fairly dry month in Seattle, with just half the normal precipitation. More noteworthy, however, was the monthâs average temperature, which ended up 0.8 degrees below normal.