Portland, Oregon weather in September
Temperature, rain and sunshine in September: long-term averages from 30 years of weather data, not a forecast.
Holiday weather in September
Excellent
Best time to visit: June – September
What is the weather like in Portland, Oregon in September?
In September, Portland, Oregon is warm: daytime highs average 24 °C, and nights cool down to about 12 °C. The sun shines for around 8 hours a day. Rain falls on about 6 days, adding up to 44 mm. All in all, September is an excellent month for a holiday in Portland, Oregon.
September compared
How the weather changes from August to October. Tap a month to open it.
| AugustAug | SeptemberSep | OctoberOct | |
|---|---|---|---|
| Score | 96 | 91 | 62 |
| Day | 28° | 24° | 17° |
| Night | 15° | 12° | 8° |
| Sun | 10 h | 8 h | 5 h |
| Rain days | 3 | 6 | 12 |
More details for September
- Daylight
- 12 h 37 min06:48 – 19:24
- UV index
- 5 · moderateclear sky, noon (estimate)All months
- Muggy days
- 0 daysdew point 18 °C or moreAll months
- Wind
- 11 km/haverage daily peakAll months
- Cloud cover
- 44 %on averageAll months
- Hot days
- 3 days30 °C or moreAll months
- Snow days
- 0 days1 cm or more of fresh snowAll months
- Time zone
- UTC−7America/Los_Angeles
How the score comes together
- Temperatureweight 50 %100 %
- Sunshineweight 20 %78 %
- Few rainy daysweight 30 %83 %
Each factor is rated from 0 to 100 % and weighted for the travel style “City break”.
What to pack in September
- Sunscreen
- A jumper for the evenings
Portland, Oregon in September: quick answers
Is Portland, Oregon hot in September?
Warm rather than hot: in September, daytime highs in Portland, Oregon average 24 °C and nights cool to about 12 °C. On about 3 days the thermometer climbs to 30 °C or more.
Does it rain much in Portland, Oregon in September?
Rain falls on about 6 days, adding up to 44 mm.
Portland, Oregon month by month
The whole year in Portland, OregonAll destinations: USAWhere to go in September
Climate averages 1996–2025, not a forecast. Data: Copernicus ERA5 / ERA5-Land via Open-Meteo.com (CC BY 4.0), NOAA OISST, WMO 1991–2020 (NOAA NCEI), GeoNames (CC BY 4.0). Sources & licences