• Artist rendering of Pioneer Square during Klondike Gold Rush

    Klondike Gold Rush - Seattle Unit

    National Historical Park Washington

Weather Statistics of Seattle

nps staff photo

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Often confused with the wetter coastal Northwest climate, Seattle's annual precipitation ranges from 30 to 36 inches. Most of this falls from mid-September till June often as light to moderate showers.

This marine influence causes Seattle's spring to come relatively late compared to inland locations. Winter rains give way to spring showers. Cold cloudy days change to clear cloudy days, but by mid-June occasional 2-or 3 day stretches of clearer weather can happen.

Summer finally rolls into the area by mid-July and for about 8 weeks you can count on sunny, dry, and mild days. usually temperatures can be found ranging between 75 and 60 F. There is the occasional "heatwave", but different from other locations heatwaves here are measured in hours instead of days. Even on the hottest days, nearing the mid-nineties, nighttime temperatures often fall to 75 or below.

By mid-September the weather starts to the cool. Clear days are replaced with cloudy and occasionally wet weather. By mid-November frost and freezes can occur in the outlying communities. Within the heat island of Seattle temperatures usually range between 55-35 F.

By December sunshine becomes scarce. The short days are cold and wet. Outside of Seattle proper temperatures now range between mid-40's to high 20's. Snow when it does appear is a rare occurrence an rarely last more than a day or two, but just over 15 miles east and west of downtown Seattle daily snowfall totals can sometimes be measured in feet.

 

Seattle average temperatures measured at sea level:

Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
High 47 51 55 59 65 70 75 75 70 60 52 47
Low 36 37 39 43 48 53 56 57 53 46 40 36


 

Snoqualmie Pass, at 3000' ASL 15 miles east of downtown Seattle:

Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
High 30 33 37 43 50 58 65 66 59 48 34 30
Low 22 24 27 31 36 41 47 48 44 37 27 22


 

Port Angeles, at sea level 50 miles west of downtown Seattle:

Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
High 46 48 51 56 61 65 69 69 66 58 50 46
Low 34 36 37 40 45 49 52 52 49 43 38 35

Did You Know?

Street cars in Seattle

Early Seattlites used street cars to get around town. Today they are making a comeback.