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Weather in September in Seattle, Washington

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< September >
 
Normal Max/ High Temperature 20°C (69°F)
 
Average Temperature 16°C (61°F)
 
Min/ Low Temperature 12°C (53°F)
 
Normal Precipitation 49mm (1.9in)
Number of Wet Days (probability of rain on a day) 8 (27%)
Average Sunlight per day 06:19
Average Daylight per day 12:30
Sunny (Cloudy) Daylight Hours 51% (49%)
Sun altitude at solar noon on the 21st day.
42.9°


  • The average temperature in Seattle, Washington in September is very mild at 16 °C (60.8 °F).
  • Afternoons can be warm with average high temperatures reaching 20.4 °C (68.7 °F).
  • Overnight temperatures are generally quite mild with an average low of 11.6 °C (52.9 °F).
  • In September the mean daily temperature range/ variation is 8.8 °C (15.8 °F).
  • The weather in September is a little parched with intermittent rain. A mere 49.3mm (1.9in) of fluid is deposited across on average 8 days.
  • The skies in Seattle, Washington are reasonably fine with on average a detectable 6:19 of magnificent sunshine daily.
  • The shortest day is 11:39 long and the longest day is 13:21 long with an average length of 12:30.
  • There are approximately 5:59 per day when bright sunshine is absent due to cloud, haze or the sun being too low on the horizon to register.
  • It is sunny approximately 51.3% of daylight hours and cloudy 48.7% of daylight hours.

Check the distance to and compare the Seattle, Washington September averages with somewhere beginning with:

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Weather Trend Graph for September in Seattle, Washington, Usa

Graph of weather in Seattle, Washington in September

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