Seattle weather in August 2025

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

  • 24°C maximum daytime temperature in August in Seattle24
    24°C max day temperature
  • 9 hours of sunshine per day
  • 6 days with some rainfall in August in Seattle6
    6 days with some rainfall
  • 13°C minimum night-time temperature in August in Seattle13
    13°C min night temperature
  • 14 hours of daylight per day in August in Seattle14
    14 hours of daylight per day
  • No heat & humidity in August in Seattle0
    No heat & humidity
  • 31 mm monthly rainfall in August in Seattle31
    31 mm of monthly rainfall
  • UV (maximum) index 6 (High) in August in Seattle6
    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.

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

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How hot is it in Seattle in August?

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

How sunny is it in Seattle in August?

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

Does it rain in Seattle in August?

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

Seattle August sunrise & sunset times

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

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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