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).
It's still very spring-like until around July 5th. From July through September the weather is perfect, temperatures range from 75 to 98. This will be a great time to explore Seattle's waterfront, Cascade and Olympic mountains, San Juan Islands, take a ferry to Victoria B.C. or just relax at a Seattle Mariners game or rollerblade at Greenlake. Outside of the peak summer months, Seattle can also be very pleasant to visit during the Spring.