Friday Harbor weather in August 2025

Expect 21°C daytime maximum temperatures in the shade with on average 9 hours of sunshine per day in Friday Harbor in August. Check more long-term weather averages for Friday Harbor in August before you book your next holiday to Washington State in 2025/2026.

• 21
  21°C max day temperature
• 9
  9 hours of sunshine per day
• 6
  6 days with some rainfall
• 11
  11°C min night temperature
• 14
  14 hours of daylight per day
• 0
  No heat & humidity
• 26
  26 mm of monthly rainfall
• 6
  6 (High) UV index
• 13
  13°C sea temperature

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The August 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)

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Friday Harbor August sunrise & sunset times

Browse the sunrise and sunset times for Friday Harbor in August 2025. Select a month to view Friday Harbor sunrise and sunset times for the next 12 months.

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