Monthly temperature, precipitation and hours of sunshine. The Köppen-Geiger climate classification is Csb. A climate graph showing rainfall, temperatures and normals. Precipitation here is about 969 mm | 38.1 inch per year. Annual Weather Averages Near Seattle. Seattle weather averages and climate Seattle, Washington. The average temperature in Seattle is 10.9 °C | 51.6 °F. Seattle, WA Monthly Weather 8:08 pm PDT Jun 2019 Jul 2019 Aug 2019 Sep 2019 Oct 2019 Nov 2019 Dec 2019 Jan 2020 Feb 2020 Mar 2020 Apr 2020 May 2020 Jun … Averages are for Seattle Boeing Field, which is 7 miles from Seattle. Seattle climate summary The Seattle lies on 51m above sea level The climate is warm and temperate in Seattle. Climate data and weather averages in Seattle. The winter months are much rainier than the summer months in Seattle.