Seattle, Washington weather in August

Averages from 2021–2025 (155 days of record).

Average high: 77°F
Average low: 60°F
Rainy days: ~6 per month
Total precipitation: 1.2 in
Warmest recorded: 92°F
Coldest recorded: 52°F

Expect August days in Seattle, Washington to top out around 77°F and cool to about 60°F overnight, with roughly 6 days of measurable rain across the month. In recent years August has ranged from 52°F to 92°F.

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Current Seattle, Washington forecast → · Historical data by Open-Meteo (ERA5).