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Seattle weather in September 2025
Expect 70°F 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 2025/2026.
- 7070°F max day temperature
- 7 hours of sunshine per day
- 99 days with some rainfall
- 5252°F min night temperature
- 1313 hours of daylight per day
- 0No heat & humidity
- 1.91.9 inches of monthly rainfall
- 55 (Moderate) UV index
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Recommended for Washington State
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) | Imperial (°F)
More about the USA
How hot is it in Seattle in September?
Daytime temperatures usually reach 70°F in Seattle in September, falling to 52°F 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 1.9 inches.
Seattle September sunrise & sunset times
Browse the sunrise and sunset times for Seattle in September 2025. Select a month to view Seattle sunrise and sunset times for the next 12 months.
JanFebMarAprMayJunJulAugSepOctNovDec
Date | Sunrise times | Sunset times |
---|---|---|
Monday, 1st September 2025 | 05:28 | 18:49 |
Monday, 15th September 2025 | 05:47 | 18:21 |
Tuesday, 30th September 2025 | 06:08 | 17:50 |
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