September · United States
Best time to visit Portland in September Weather, crowds & prices
Weather in Portland in September
Average temperature 18°C, 37 mm of rain, about 14 days with 6+ hours of sunshine and 67% humidity — based on the five most recent complete years of ERA5 data (2021–2025).
September score
9.1/10
Ranked #3 of 12 months
- Avg temp
- 18°C
- Rainfall
- 37 mm
- Humidity
- 67%
- Days with 6h+ sun
- 14
- Crowd Density
- Moderate Crowds
- Average Expenses
- $$ · Moderate Cost ($$)
September in Portland scores 9.1/10 for sightseeing and cultural travel - one of the top 12-month picks (#3). Expect around 18°C, 37 mm of rain, and roughly 14 days with 6+ hours of sunshine this month.
Portland pairs a walkable downtown of parks and bookshops with the waterfalls and wine of the Columbia gorge.
September is one of the strongest months in Portland (3rd)
September averages 18°C (64°F), the range most people find easiest for walking a city all day without either overheating or losing daylight to weather.
Expect 37 mm of rain — occasional showers rather than washed-out days — alongside about 14 days with 6+ hours of sunshine and 12.3 daylight hours.
A 9.1/10 puts this among the year's best months in Portland (3rd of 12); only August scores higher, at 10/10.
Pack layers you can shed by midday plus one warm layer for the evening.
Figure on mid-season pricing, with crowds are moderate.
Frequently asked
- What is the weather like in Portland in September?
- In September, Portland averages 18°C, 37 mm of rain, and about 14 days with 6+ hours of sunshine. Its climate-comfort score is 9.1/10.
- Is September a good time to visit Portland?
- September earns a 9.1/10 climate-comfort score. Use the year-round chart to weigh the weather against your budget and crowd preferences.
- How much does it rain in Portland in September?
- Expect about 37 mm of rain in September. Average humidity is 67% and there are about 14 days with 6+ hours of sunshine.
Curated in Portland
Tickets & experiences
Things to do in Portland
Portland, United States. Live activities and tours from GetYourGuide, matched to this destination.