Washington State weather in August 2025

Expect 24°C daytime maximum temperatures in the shade with on average 9 hours of sunshine per day in Washington State in August. Check more long-term weather averages for Washington State in August before you book your next holiday to Washington State in 2025/2026.

  • 24°C maximum daytime temperature in August in Washington State (Seattle)24
    24°C max day temperature
  • 9 hours of sunshine per day
  • 6 days with some rainfall in August in Washington State (Seattle)6
    6 days with some rainfall
  • 13°C minimum night-time temperature in August in Washington State (Seattle)13
    13°C min night temperature
  • 14 hours of daylight per day in August in Washington State (Seattle)14
    14 hours of daylight per day
  • No heat & humidity in August in Washington State (Seattle)0
    No heat & humidity
  • 31 mm monthly rainfall in August in Washington State (Seattle)31
    31 mm of monthly rainfall
  • UV (maximum) index 6 (High) in August in Washington State (Seattle)6
    6 (High) UV index

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The August 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 August. Select a holiday destination to see more weather parameters.

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

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How hot is it in Washington State in August?

Daytime temperatures usually reach 24°C in Seattle, Washington State in August, falling to 13°C at night.

How sunny is it in Washington State in August?

There are normally 9 hours of bright sunshine each day in Seattle, Washington State in August - that's 63% of daylight hours.

Does it rain in Washington State in August?

There are usually 6 days with some rain in Seattle, Washington State in August and the average monthly rainfall is 31mm.

Washington State August sunrise & sunset times

Browse the sunrise and sunset times for Washington State in August 2025. 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 August 2025 04:47 19:43
Saturday, 16th August 2025 05:07 19:19
Sunday, 31st August 2025 05:27 18:51

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