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Nearly every November day warms to over 40 Â°F (4 Â°C) in Seattle. The city averages 2 days in November when the thermometer reaches into the 60s Â°F (over 16 Â°C). Temperatures above 70 Â°F (21 Â°C) are not expected here this month.The thermometer dips to freezing or below on an average of 3 nights.lthough it can snow in November, most years don't get snow this early. The sun's rays reach the ground in Seattle during 28 percent of daylight hours on average in November, for a total of 78 hours in the month. Typically on 3 days this month the sky is mainly clear, with at most 30 percent cloud cover.
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).