The temperatures in Portland in September are usually low and can range between 13°C and 20°C.
The wather in Portland in September can vary between cold and nice weather days. Expect a few rainy days but usually not more than 3.
Our weather forecast can give you a great sense of what weather to expect in Portland in September 2025.
If you’re planning to visit Portland in the near future, we highly recommend that you review the 14 day weather forecast for Portland before you arrive.
Temperatures
20° / 13°
Rainy Days
2
Snowy Days
0
Dry Days
28
Rainfall
37
mm
Sun Hours
10.1
Hrs
