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°C maximum daytime temperature in August in Friday Harbor21
    21°C max day temperature
  • 9 hours of sunshine per day
  • 6 days with some rainfall in August in Friday Harbor6
    6 days with some rainfall
  • 11°C minimum night-time temperature in August in Friday Harbor11
    11°C min night temperature
  • 14 hours of daylight per day in August in Friday Harbor14
    14 hours of daylight per day
  • No heat & humidity in August in Friday Harbor0
    No heat & humidity
  • 26 mm monthly rainfall in August in Friday Harbor26
    26 mm of monthly rainfall
  • UV (maximum) index 6 (High) in August in Friday Harbor6
    6 (High) UV index
  • 13°C sea temperature in August in Friday Harbor13
    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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How hot is it in Friday Harbor in August?

Daytime temperatures usually reach 21°C in Friday Harbor in August, falling to 11°C at night.

How sunny is it in Friday Harbor in August?

There are normally 9 hours of bright sunshine each day in Friday Harbor in August - that's 64% of daylight hours.

How warm is the sea around Friday Harbor in August?

The average sea temperature around Friday Harbor in August is 13°C.

Does it rain in Friday Harbor in August?

There are usually 6 days with some rain in Friday Harbor in August and the average monthly rainfall is 26mm.

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.

JanFebMarAprMayJunJulAugSepOctNovDec

Date Sunrise times Sunset times
Friday, 1st August 2025 04:47 19:49
Saturday, 16th August 2025 05:08 19:24
Sunday, 31st August 2025 05:29 18:55

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