Portland weather in September
Long-run climate averages for Portland, OR in September, plus what the forecast models say for the days ahead.
In September, Portland averages 75°F by day and 54°F at night. The wettest month is usually December.
September in Portland averages a daytime high of 75°F and an overnight low of 54°F, which reads as warm for this part of the world. It is among the three warmest months of the year here. Across the whole year Portland sees roughly 59 inches of precipitation.
Climate averages tell you what to pack. They do not tell you what next Tuesday looks like — for that, see the live Portland forecast with every model compared and how much they currently agree.
Portland weather by month
what to expect in Portland through the yearHere is Portland's typical weather in each month: the average daytime high and overnight low in °F, how each month feels, and the wettest month marked. Use it to plan any trip to Portland by season.