September weather in Seattle, United States
Averages from 150 days in September across 2020–2024.
Typical conditions
| Average high | 21.2°C |
|---|---|
| Average low | 13.1°C |
| Average mean | 16.5°C |
| Total precipitation | 303.4 mm |
| Rainy days | 69 |
| Average precipitation hours | 3.3 h |
| Average max wind speed | 18 km/h |
| Average sunshine | 9.2 h/day |
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