Is Portland hot in September?
Days are typically mild at 23.9°C, while nights average 12.8°C.
United States · 1991–2020 normal
Portland in
September.
Typical September weather in Portland: 23.9°C by day, 12.8°C at night, 41 mm of rain over 5.3 wet days. These are measured 1991–2020 station normals, not a forecast.
Typical high23.9°C
Typical low12.8°C
Rain41 mm
Wet days5.3
In the year-round weather comparison, September scores 93 out of 100, the highest of the year. Daylight is calculated as 12 h 28 from latitude 45.52°.
September at a glance
What is Portland like in September?
Plain answers from the measured climate record—not a forecast or a promise about a particular trip.
Does it rain much?
The measured monthly average is 41 mm across about 5 wet days.
How much daylight is there?
There are about 12 h 28 between sunrise and sunset at mid-month, calculated from the place latitude.
Is September a good time to visit?
September is the strongest month in our year-round weather comparison.
The evidence behind this page
One month,
from the same station.
- Place identity
- GeoNames 5746545
- NOAA station
- USC00356749 · PORTLAND KGW-TV
- Station distance
- 1.2 km from the place centre
- Coverage
- Strong coverage · 30 usable years
- Important limit
- Historical climate is not a forecast. Nearby stations can miss mountains, coasts, and local microclimates.
Next step
Choose your month.
Then plan the details.
The weather comparison for Portland is based on climate evidence, not payments from travel companies. Flight, accommodation and activity links will be clearly labelled when they are added; there are no booking offers on this page today.
How travel partnerships will work