Hotter still is the core. In the sun this is thought to be 10 - 20 million degrees. These temperatures are due to the pressure caused by gravity trying to compress the star. It has to be this temperature for fusion of hydrogen to take place.
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).
Weather in Washington in September. The average maximum daytime temperature in Washington in September is a warm 26Â°C (79Â°F) with low heat & humidity. There are usually 7 hours of bright sunshine each day, which represents 60% of the 12 hours of daylight.