Friday Harbor weather in May 2025

Expect 16°C daytime maximum temperatures in the shade with on average 8 hours of sunshine per day in Friday Harbor in May. Check more long-term weather averages for Friday Harbor in May before you book your next holiday to Washington State in 2025/2026.

  • 16°C maximum daytime temperature in May in Friday Harbor16
    16°C max day temperature
  • 8 hours of sunshine per day
  • 11 days with some rainfall in May in Friday Harbor11
    11 days with some rainfall
  • 7°C minimum night-time temperature in May in Friday Harbor7
    7°C min night temperature
  • 15 hours of daylight per day in May in Friday Harbor15
    15 hours of daylight per day
  • No heat & humidity in May in Friday Harbor0
    No heat & humidity
  • 33 mm monthly rainfall in May in Friday Harbor33
    33 mm of monthly rainfall
  • UV (maximum) index 6 (High) in May in Friday Harbor6
    6 (High) UV index
  • 10°C sea temperature in May in Friday Harbor10
    10°C sea temperature

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The May 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 warm is it in Friday Harbor in May?

Daytime temperatures usually reach 16°C in Friday Harbor in May, falling to 7°C at night.

How sunny is it in Friday Harbor in May?

There are normally 8 hours of bright sunshine each day in Friday Harbor in May - that's 52% of daylight hours.

Is the sea cold around Friday Harbor in May?

The average sea temperature around Friday Harbor in May is 10°C.

Does it rain in Friday Harbor in May?

There are usually 11 days with some rain in Friday Harbor in May and the average monthly rainfall is 33mm.

Friday Harbor May sunrise & sunset times

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

JanFebMarAprMayJunJulAugSepOctNovDec

Date Sunrise times Sunset times
Thursday, 1st May 2025 04:52 19:27
Friday, 16th May 2025 04:30 19:48
Saturday, 31st May 2025 04:15 20:05

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