Washington State weather in May 2026

Expect daytime maximum temperatures of 18°C in Washington State, USA 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 Washington State (Seattle)18
    18°C max day temperature
  • 8 hours of sunshine per day
  • 11 days with some rainfall in May in Washington State (Seattle)11
    11 days with some rainfall
  • 8°C minimum night-time temperature in May in Washington State (Seattle)8
    8°C min night temperature
  • 15 hours of daylight per day in May in Washington State (Seattle)15
    15 hours of daylight per day
  • No heat & humidity in May in Washington State (Seattle)0
    No heat & humidity
  • 46 mm monthly rainfall in May in Washington State (Seattle)46
    46 mm of monthly rainfall
  • UV (maximum) index 6 (High) in May in Washington State (Seattle)6
    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.

Top Washington State destinations

Below are average maximum temperatures at popular countries, regions and places in Washington State in May. Select a holiday destination to see more weather parameters.

All Washington State destinations

Metric (°C / mm)  |  Imperial (°F / inches)

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More about the USA

How hot is it in Washington State in May?

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

How sunny is it in Washington State in May?

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

Does it rain in Washington State in May?

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

Washington State May sunrise & sunset times

Browse the sunrise and sunset times for Washington State in May 2026. Select a month to view Washington State sunrise and sunset times for the next 12 months. The Washington State sunrise and sunset times shown below are for Seattle.

JanFebMarAprMayJunJulAugSepOctNovDec

Date Sunrise times Sunset times
Friday, 1st May 2026 04:52 19:22
Saturday, 16th May 2026 04:30 19:42
Sunday, 31st May 2026 04:16 19:58

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