Portland in september: average Weather, Temperature and Climate
Weather in Portland in september 2025
The weather in Portland in september comes from statistical datas on the last years. You can view the weather statistics the entire month, but also by clicking on the tabs for the beginning, the middle and the end of the month.
Average weather throughout september
good weather UV index: 6
Weather at 6am
59°F
Clear/Sunny
44% of time
22%
16%
11%
Weather at 12pm
76°F
Clear/Sunny
55% of time
17%
16%
7%
Weather at 6pm
65°F
Clear/Sunny
57% of time
19%
16%
5%
Weather at 3am
56°F
37%
21%
18%
12%
Evolution of daily average temperature and precipitation in Portland in september
These charts show the evolution of average minimum/maximum temperatures as well as average daily precipitation volume in Portland in september.
The climate of Portland in september is good
In september in Portland, the climate is quite dry (with 3.5in of rainfall over 5 days). The weather's not getting better compared to the previous month since in august there is an average of 0.8in of precipitation over 1 days.
The climate enjoyable around this city september. Temperatures are up to 77°F. In the morning the temperature drops to 59°F. Thus, the mean temperature average on this month of september in Portland is 68°F. Note that these seasonal averages are in contrast with those observed in Portland in the month of september with a maximum record of 104°F in 2017 and a minimum record of 43°F in 2019. You can expect to have about 6 days with temperatures up to 86°F, or 20 of the month.
Day length in Portland in september is 12:31. The sun rises at 05:50 and sunset is at 18:21.
With a good weather, this month is a good time to go there.
Seasonal average climate and temperature of Portland in september
Check below seasonal norms These statistics are compiled from the weather statements of the past years of september.
| September | |||||
| Outside temperature | |||||
| Average temperature | 68°F | ||||
| Highest temperature | 77°F | ||||
| Lowest temperature | 59°F | ||||
| Highest record temperature | 104°F (2017) | ||||
| Lowest record temperature | 43°F (2019) | ||||
| Number of days at +86°F | 6 day(s) (20%) | ||||
| Number of days at +65°F | 27 day(s) (90%) | ||||
| Sea temperature | |||||
| Average sea temperature | 57°F | ||||
| Lowest sea temperature | 54°F | ||||
| Highest sea temperature | 59°F | ||||
| Wind | |||||
| Wind speed | 10km/h | ||||
| Wind temperature | 59°F | ||||
| Precipitation (rainfall) | |||||
| Rainfall | 3.5in | ||||
| Number of days with rainfall | 5 day(s) (15%) | ||||
| Record daily rainfall | 2.3in (2013) | ||||
| Other climate data | |||||
| Humidity | 80% | ||||
| Visibility | 9.01km | ||||
| Cloud cover | 30% | ||||
| UV index | 6 | ||||
| Daily sunshine hours | 12 | ||||
| Sunrise and sunset | |||||
| Time of sunrise | 05:50 | ||||
| Time of sunset | 18:21 | ||||
| Length of day | 12:31 | ||||
| Our opinion about the weather in september | |||||
| Our opinion at whereandwhen.net | good | ||||
How was the weather last september?
Here is the day by day recorded weather in Portland in september 2024:
67°F to 90°F
61°F to 74°F
61°F to 77°F
58°F to 88°F
65°F to 97°F
68°F to 95°F
70°F to 88°F
67°F to 88°F
59°F to 81°F
58°F to 77°F
54°F to 65°F
56°F to 70°F
52°F to 72°F
56°F to 74°F
54°F to 72°F
52°F to 77°F
52°F to 59°F
56°F to 67°F
58°F to 72°F
54°F to 65°F
52°F to 79°F
58°F to 74°F
61°F to 77°F
63°F to 92°F
59°F to 70°F
56°F to 72°F
58°F to 68°F
52°F to 70°F
50°F to 67°F
49°F to 74°F
Map: other cities in the United States (USA) in september
Cities near Portland:
| Salem (Oregon) in september | perfect weather |
| Lincoln City (Oregon) in september | good weather |
| Long Beach (Washington) in september | good weather |
| Newport (Oregon) in september | good weather |
| Ocean Park (Washington) in september | good weather |
| Mount Rainier National Park (Washington) in september | tolerable weather |
| Westport (Washington) in september | good weather |
| Seattle in september | perfect weather |
| Coos Bay in september | good weather |
| Crater Lake (Oregon) in september | tolerable weather |
| La Push (Washington) in september | good weather |
| Boise (Idaho) in september | perfect weather |
Click over cities on the map for information about the weather in september.
Portland
perfect weather
good
tolerable
bad
very bad
Weather data for Portland in september:
Weather data for Portland for september are derived from an average of the weather forecast since 2009 in Portland. There is a margin of error and these forecasts are to be considered as general information only. The weather in Portland can vary slightly from year to year, but this data should limit surprises. So you can pack your bags or check for the best time in year to go to Portland.