Temperature
Pleasant by day, brisk at night.
78°Ftypical September high
Typical range
September climate
September in Portland
United States · North America
Warm days with cooler nights and good sunshine.
Good overall
Mid to late
Daytime high
78°F
Lows around 54°F
Rain
A few rainy days
Sun
8 h/day
Air feel
Comfortable
When to visit
Month-by-month fit
Best
Precipitation
A few rainy days, with mixed-length spells. About 6 wet days, fewer than in most months.
20%wet-day frequency
AmountWet-day chance
Sunshine
Good sunshine this month.
7.9 hSeptember sunshine
Heat & humidity by month
Warm days with mostly dry air.
LowSeptember Heat feel
Easy airWarm airHot airHumid air
Hourly temperature pattern
In September, afternoons feel about 73° and nights feel near 53°.
Very coldColdCoolComfortableWarmNight hours
Clear sky
Partly cloudy skies this month.
56%September Clear sky
Clear skyCloud
Wind pattern
Calm winds are typical in September.
4 mphSeptember Calm
More detailIncludes daypart comfort
Typical September day
September late afternoons are around 76°F, easing to about 69°F in early evening.
Avg temp Typical range
Morning63°F
Rain12%
Cloud50%
Humid airLow
Sun intensityLow
Midday70°F
Rain16%
Cloud47%
Humid airLow
Sun intensityStrong
Late afternoon76°F
Rain13%
Cloud44%
Humid airLow
Sun intensityModerate
Early evening69°F
Rain9%
Cloud38%
Humid airLow
Sun intensityMinimal
Best windowData tableView month-by-month numbers
View month-by-month numbers
| Month | High°F | Low°F | Rainin | Wet days | Sunh | Humidity% |
|---|---|---|---|---|---|---|
| Jan | 49 | 38 | 6.9 | 18 | 2.8 | 84 |
| Feb | 52 | 38 | 5.3 | 16 | 4.1 | 80 |
| Mar | 57 | 41 | 5.8 | 19 | 6.2 | 78 |
| Apr | 63 | 44 | 4.3 | 16 | 7.4 | 73 |
| May | 70 | 49 | 2.8 | 12 | 8.9 | 71 |
| Jun | 76 | 54 | 1.7 | 8 | 9.7 | 67 |
| Jul | 85 | 58 | 0.3 | 2 | 10.7 | 60 |
| Aug | 85 | 58 | 0.5 | 2 | 9.6 | 60 |
| Sep | 78 | 54 | 1.7 | 6 | 7.9 | 66 |
| Oct | 65 | 47 | 4.1 | 13 | 4.9 | 78 |
| Nov | 54 | 42 | 6.9 | 17 | 2.6 | 84 |
| Dec | 48 | 38 | 8.0 | 19 | 2.1 | 85 |
Similar climates
Similar
Similar travel styleAshevilleUnited StatesSimilar travel styleNew York CityUnited StatesSimilar travel styleVancouverCanadaSimilar travel stylePittsburghUnited States
Want a side-by-side climate view? Compare Portland with Asheville.
Climate data notePlanning guidance, not a forecast
Typical monthly values are based on long-term climate records. Useful for planning, not a forecast. Check the weather before you travel.
Sunshine: source type is not yet identified at metric level.
Local microclimates can vary by beach, neighborhood, trail, or elevation.
Last updated: Jun 1, 2026
Data & methodology