Typical September weather
Portland
Oregon · September
77° days
54° nights
about 4 rainy days · 12½ hours of daylight
What to pack
- Light jacket
- Sunscreen
What September feels like
Harvest starts in the Willamette Valley and the coast finally gets its sunny stretch, which is the local tell that September is the month to take time off. The rains usually hold until the last week, and wine-country weekends book out early.
Expect about 4 days with real rain — enough to notice, not enough to plan around. Humidity stays comfortable; the air never feels heavy.
The numbers
| Typical high | 77° |
|---|---|
| Typical low | 54° |
| Days with real rain | 4 |
| Total rain | 1.5 in |
| Humidity | comfortable |
| Sunrise / sunset (mid-month) | 6:49 am / 7:21 pm |