Oregon weather in September
The state broadly agrees with itself in September: afternoons run 77° in Portland and 76° in Bend, with everywhere else in between.
Based on 2 weather stations. Two stations on opposite sides of the Cascades — Portland’s drizzle and Bend’s high-desert sun are the state’s two weather personalities, though the coast itself isn’t measured here.
Portland & the Willamette Valley
Highs near 77°, nights around 54°, and 1.5 in of rain in a typical September.
| Place | Highs / lows | Wet days | The short version |
|---|---|---|---|
| Portland | 77° / 54° | 4 | Summer minus the heat, and the light turns golden. |
Central Oregon
Highs near 76°, nights around 41°, and 0.3 in of rain in a typical September.
| Place | Highs / lows | Wet days | The short version |
|---|---|---|---|
| Bend | 76° / 41° | 1 | The river empties out and the frosts begin. |
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.