Seattle, WA Weather & Climate Normals
Seattle's real weather, in one number
Seattle, WA scores 56/100 on this site's reading of NOAA's own 30-year normals: strongly seasonal. Comfortable weather is limited to a shorter window; summers, winters, or precipitation swing wide. 5 of the year's 12 months average between 55 and 75°F, the range this site counts as mild.
Seattle's hottest and coldest months
Seattle's hottest month is Aug, averaging 67°F; its coldest is Dec, averaging 42°F, a 25.3°F swing across the year, a middling gap by national standards.
Rain and snow in Seattle
Seattle averages 37.82in of precipitation a year across roughly 163 days with measurable rain or snow, and 3.8in of snow a year.
Where Seattle ranks
Seattle ranks 718 of 4876 US cities in this dataset for comfort score, and 30 of 125 within WA. About 780,995 people live there.
If you need tomorrow's forecast, not the 30-year average
Everything above is a 30-year average from SEATTLE SAND PT WSFO, WA US, 6.5 miles from Seattle, not a prediction for any specific day.
More on how this is worked out
How the comfort score is calculated · Why some cities show no snow or rain figure