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Friday Harbor weather in September 2026
Expect daytime maximum temperatures of 18°C in Friday Harbor, Washington State in September based on long-term weather averages. There are 7 hours of sunshine per day on average.
- 18°C max day temperature
18 - 7 hours of sunshine per day
- 9 days with some rainfall
9 - 10°C min night temperature
10 - 13 hours of daylight per day
13 - No heat & humidity
0 - 36 mm of monthly rainfall
36 - 5 (Moderate) UV index
5 - 12°C sea temperature
12
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The September weather guide for Washington State (Friday Harbor) 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 Friday Harbor in September?
Daytime temperatures usually reach 21°C in Friday Harbor in September, falling to 11°C at night.
How sunny is it in Friday Harbor in September?
There are normally 7 hours of bright sunshine each day in Friday Harbor in September - that's 57% of daylight hours.
Does it rain in Friday Harbor in September?
There are usually 9 days with some rain in Friday Harbor in September and the average monthly rainfall is 49mm.
Friday Harbor September sunrise & sunset times
Browse the sunrise and sunset times for Friday Harbor in September 2026. Select a month to view Friday Harbor sunrise and sunset times for the next 12 months.
JanFebMarAprMayJunJulAugSepOctNovDec
| Date | Sunrise times | Sunset times |
|---|---|---|
| Tuesday, 1st September 2026 | 05:30 | 18:53 |
| Tuesday, 15th September 2026 | 05:49 | 18:24 |
| Wednesday, 30th September 2026 | 06:10 | 17:53 |
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