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Seattle — weather in September

21.3°C Daytime temperatures 13.7°C Night temperatures 15 Sunny days 11.7-13.4 Sun (hours) 2 Rainy days 32.2 mm Precipitation 0°C water temperature
Air temperature
2022 2021 2020 2019 2018 2017 2016 2015 2014 2013
The maximum daily temperature 34.7°C — 12 September 2013.
The maximum night temperature 23°C — 6 September 2017.
The minimum daily temperature 12°C — 17 September 2021.
The minimum night temperature 5°C — 30 September 2019.
Sunny, cloudy and gloomy days
Precipitation, mm
Maximum precipitation 78.4 mm — January. Minimum precipitation 9.6 mm — August.
Wind speed, km / h
Maximum wind speed 10.1 km / h — March. Minimum wind speed 7.9 km / h — August.
Number of hours of sunshine
The maximum number of hours of sunshine per day 10.8 h. — July. The minimum number of hours of sunshine per day 2.9 h. — December.
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