August · United States
Best time to visit Seattle in August Weather, crowds & prices
Weather in Seattle in August
Average temperature 19°C, 29 mm of rain, about 24 days with 6+ hours of sunshine and 78% humidity — based on the five most recent complete years of ERA5 data (2021–2025).
August score
9.6/10
Ranked #2 of 12 months
- Avg temp
- 19°C
- Rainfall
- 29 mm
- Humidity
- 78%
- Days with 6h+ sun
- 24
- Crowd Density
- Peak Tourist Rush
- Average Expenses
- $$$ · Peak Season Rates ($$$)
August in Seattle scores 9.6/10 for sightseeing and cultural travel - one of the top 12-month picks (#2). Expect around 19°C, 29 mm of rain, and roughly 24 days with 6+ hours of sunshine this month.
Ferry views, coffee culture, and evergreen trails peak in clearer May-September weather.
August ranks 2nd of 12 for Seattle — one of the best windows
August averages 19°C (66°F) — pleasant for mornings and evenings on foot in the city, with a midday break when the sun is strongest.
Expect 29 mm of rain — occasional showers rather than washed-out days — alongside about 24 days with 6+ hours of sunshine and 14.1 daylight hours.
A 9.6/10 puts this among the year's best months in Seattle (2nd of 12); only July scores higher, at 9.6/10.
Pack light clothing, a hat and real sun protection.
Figure on peak pricing, with this is one of the busiest months here. You are paying the year's highest rates for the year's best conditions — book early or shift a few weeks either side.
Frequently asked
- What is the weather like in Seattle in August?
- In August, Seattle averages 19°C, 29 mm of rain, and about 24 days with 6+ hours of sunshine. Its climate-comfort score is 9.6/10.
- Is August a good time to visit Seattle?
- August earns a 9.6/10 climate-comfort score. Use the year-round chart to weigh the weather against your budget and crowd preferences.
- How much does it rain in Seattle in August?
- Expect about 29 mm of rain in August. Average humidity is 78% and there are about 24 days with 6+ hours of sunshine.
Curated in Seattle
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