Portland weather in September
September in Portland averages 77°F by day and 54°F at night, with 1.5 inches of precipitation. It is the 3rd-warmest and 10th-wettest month of the year here.
- Average high
- 77°F-6° vs August
- Average low
- 54°F0 nights below freezing
- Precipitation
- 1.5 in4 days with 0.1 in. or more
- Snow
- 0.0 in2 days at 90°F+
Is September a good time to visit Portland?
Yes. September is one of the most comfortable months in Portland by our rule (highs of 62 to 86°F, lows of 42°F or more and under 4.5 inches of precipitation). The most comfortable months overall are April to October.
Get outside in Portland in September
September is made for being outside. Try Mill Ends Park, Oregon Zoo, Forest Park, Lan Su Chinese Garden. All things to do in Portland.
On September 15 the sun rises at 6:49 am and sets at 7:21 pm, giving 12h 32m of daylight. Daylight all year.
What to pack for Portland in September
- Summer clothes, with a light layer for air conditioning
Based on 30-year averages, not a forecast. Check the forecast a few days before you go.
September nearby
| City | Distance | High | Low | Precip. |
|---|---|---|---|---|
| Portland | 77°F | 54°F | 1.5 in | |
| Beaverton, OR | 7 mi | 77°F | 54°F | 1.5 in |
| Vancouver, WA | 8 mi | 77°F | 54°F | 1.5 in |
| Gresham, OR | 13 mi | 77°F | 54°F | 1.5 in |
| Hillsboro, OR | 14 mi | 76°F | 48°F | 1.4 in |
| Salem, OR | 43 mi | 78°F | 51°F | 1.5 in |
| Eugene, OR | 103 mi | 78°F | 48°F | 1.4 in |
Frequently asked questions
What is the weather like in Portland in September?
In September, Portland averages a high of 77°F and a low of 54°F, with 1.5 inches of precipitation (NOAA 1991-2020 normals).
Is September a good time to visit Portland?
Yes. September is one of Portland's most comfortable months by our rule: highs between 62°F and 86°F, lows of 42°F or more and modest rain.
Does it snow in Portland in September?
Rarely. The September snowfall normal is under half an inch.
Before and after: Portland in August and Portland in October. All twelve months: Portland weather by month.
NOAA NCEI 1991-2020 climate normals, station Portland Intl. Airport, OR, 5.9 miles from the city center.