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).
Seattle: Annual Weather Averages. July is the hottest month in Seattle with an average temperature of 18Â°C (64Â°F) and the coldest is January at 5Â°C (41Â°F) with the most daily sunshine hours at 10 in July.The wettest month is December with an average of 150mm of rain.The best month to swim in the sea is in July when the average sea temperature is 14Â°C (57Â°F).uly is the hottest month in Seattle with an average temperature of 18Â°C (64Â°F) and the coldest is January at 5Â°C (41Â°F) with the most daily sunshine hours at 10 in July.