Washington weather in September
One place stands in for Washington here — these are Seattle's numbers, not a statewide average.
Based on 1 weather station, in Seattle. One station — Seattle speaks for Puget Sound, not for the Cascades, the rainforest coast, or the dry half of the state east of the mountains.
Seattle & Puget Sound
Highs near 72°, nights around 54°, and 1.6 in of rain in a typical September.
| Place | Highs / lows | Wet days | The short version |
|---|---|---|---|
| Seattle | 72° / 54° | 4 | Summer's quieter second half — still bright, finally uncrowded. |
Each place above has its own page for the full story — what the month feels like, what to pack, and whether the timing is right.