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September weather in Washington, United States

Averages from 150 days in September across 2020–2024.

Typical conditions

Average high25.7°C
Average low16.4°C
Average mean20.7°C
Total precipitation670.1 mm
Rainy days77
Average precipitation hours4.3 h
Average max wind speed14.6 km/h
Average sunshine8.9 h/day

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