Seattle weather in May 2025

Expect daytime maximum temperatures of 18°C in Seattle in May based on long-term weather averages. There are 8 hours of sunshine per day on average with 11 days with some rainfall and typically 46 mm of rainfall in the month.

  • 18°C maximum daytime temperature in May in Seattle18
    18°C max day temperature
  • 8 hours of sunshine per day
  • 11 days with some rainfall in May in Seattle11
    11 days with some rainfall
  • 8°C minimum night-time temperature in May in Seattle8
    8°C min night temperature
  • 15 hours of daylight per day in May in Seattle15
    15 hours of daylight per day
  • No heat & humidity in May in Seattle0
    No heat & humidity
  • 46 mm monthly rainfall in May in Seattle46
    46 mm of monthly rainfall
  • UV (maximum) index 6 (High) in May in Seattle6
    6 (High) UV index

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The May 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 / mm)  |  Imperial (°F / inches)

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How hot is it in Seattle in May?

Daytime temperatures usually reach 18°C in Seattle in May, falling to 8°C at night.

How sunny is it in Seattle in May?

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

Does it rain in Seattle in May?

There are usually 11 days with some rain in Seattle in May and the average monthly rainfall is 46mm.

Seattle May sunrise & sunset times

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

JanFebMarAprMayJunJulAugSepOctNovDec

Date Sunrise times Sunset times
Thursday, 1st May 2025 04:51 19:22
Friday, 16th May 2025 04:30 19:42
Saturday, 31st May 2025 04:16 19:59

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