January in Seattle comes with a chilly average high and average low temperature ranging between 47°F (8°C) and 37°F (3°C). The year also kicks off with the tail end of winter and the second to the least amount of sunshine in the entire year with a 69 hour average.
In February, winter starts transitioning to spring bringing slightly warmer temperatures with it. The average high temperature creeps up to 50°F (10°C). On the other hand, the average low temperature holds steady at 37°F (3°C).
Seattle Weather in March: Precipitation is at its lowest in the year during March with a 4 inch (94 mm) average. Meanwhile, the climate remains chilly but increases ever so slightly as spring officially begins. The average high temperature peaks at 54°F (12°C) and the average low temperature increases to 39°F (4°C).
April is the peak of spring in Seattle and sees enjoyable sweater weather with average high temperatures of 58°F (15°C). The average low temperature remains quite chilly at 42°F (6°C).
In May, temperatures increases to 65°F (18°C). Low temperatures also go up to 47°F (9°C) and vegetation is gorgeous during this time of the year.
Seattle Weather in June: Seattle gets a lot of sunshine in June with an average of 268 hours. Summer also officially begins bringing with it 70°F (21°C) for an average high temperature. The average low temperature is 52°F (11°C).
July is the warmest month of the year with an average high temperature of 76°F (24°C) and an average low temperature of 56°F (13°C). It’s also the driest month of the year with just a little over half an inch (17 mm) of rain. As the peak of summer, July gets 312 hours of sunshine - the most in the entire year.
August’s average high and average low temperatures remain exactly the same as the previous month. Although it ties with July as the warmest month in the year, summers in Seattle are still relatively cool and enjoyable. August also has a low precipitation rate, receiving just under an inch of rain (22 mm).
In September, the average temperature starts decreasing again as summer comes to an end. The average high temperature goes down to 71°F (21°C). The low temperature average to be expected is 52°F (11°C).
Seattle Weather in October: There is a steep drop in average high and average low temperatures in October at 60°F (15°C) and 46°F (8°C) respectively.
November is the wettest month of the year with a 7 inch (166 mm) average. The average high temperature drops further to 51°F (11°C). The average low temperature sinks to 40°F (4°C).
In December, Seattle experiences the coldest month of the year with 46°F (8°C) as the average high temperature and 36°F (2°C) as the average low temperature. The start of winter also brings the least amount of sunshine to the city (52 hours).
In general, the peak season for travel to Washington state is between the months of June through August with the shoulder seasons taking place twice in the year from April to May and September to October. Low season takes place during the colder months of November through March. When it comes to hiking and exploring Mount Rainier, the best time to visit is from mid-July to September when the weather is consistently dry, warm and sunny. For winter sports, the best time to visit is between late November until April. Food and wine in Washington, and Seattle in particular, is best during May while Seattle’s biggest food festival takes play in the middle of July. Whale watching season takes place between March and October while the flowers are best viewed during the spring time with cherry trees blooming in March.
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