Seattle weather in September 2024

Expect 21°C daytime maximum temperatures in the shade with on average 7 hours of sunshine per day in Seattle in September. Check more long-term weather averages for Seattle in September before you book your next holiday to Washington State in 2024/2025.

21
21°C max day temperature
7
7 hours of sunshine per day
9
9 days with some rainfall
11
11°C min night temperature
13
13 hours of daylight per day
0
No heat & humidity
49
49 mm of monthly rainfall
5
5 (Moderate) UV index

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The September weather guide for Washington State (Seattle) shows long term weather averages processed from data supplied by CRU (University of East Anglia), the Met Office & the Netherlands Meteorological Institute. Find out more about our data sources.

Metric (°C / mm) | Imperial (°F / inches)

More about the USA

How hot is it in Seattle in September?

Daytime temperatures usually reach 21°C in Seattle in September, falling to 11°C at night.

How sunny is it in Seattle in September?

There are normally 7 hours of bright sunshine each day in Seattle in September - that's 57% of daylight hours.

Does it rain in Seattle in September?

There are usually 9 days with some rain in Seattle in September and the average monthly rainfall is 49mm.

Seattle September sunrise & sunset times

Browse the sunrise and sunset times for Seattle in September 2024. Select a month to view Seattle sunrise and sunset times for the next 12 months.

Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec

Date	Sunrise times	Sunset times
Sunday, 1st September 2024	06:29	19:48
Sunday, 15th September 2024	06:48	19:20
Monday, 30th September 2024	07:08	18:49

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Washington - quick facts
Flight time^✝	10 hours
Time difference	UK -8 hours
Language(s)	English
Currency	US Dollar
Electricity	A + B plug (120V)
Driving side	Right
Visa^✝	Yes
Why visit?	Nature
Tourist info	State of Washington Tourism