Portland weather in October
October in Portland: nice, rainy, with clean air — a great time to visit.
#6 of 12 months in Portland · #295 of 604 destinations to visit in October · comfort 77/100 (tier B)
Updated June 2026 · climate normals from ERA5 reanalysis
Portland climate normals — October
| Daytime high | 18°C / 65°F | 😎 nice |
|---|---|---|
| Nighttime low | 9°C / 47°F | |
| Feels like (high) | 17°C / 63°F | |
| Rainfall | 82 mm / 3.2 in | 🌧 rainy |
| Rainy days | 11 days | |
| Humidity | 76% | 💦 very humid |
| Dew point | 10°C / 49°F | |
| Sunshine | 7.5 h/day | |
| Daylight | 10.9 h | |
| Wind | 13 km/h / 8 mph | |
| Air quality (US AQI) | 32 | 🍃 good |
Monthly averages from ERA5 reanalysis. AQI is the mean US Air Quality Index for the month.
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Portland in October — FAQ
- Is October a good time to visit Portland?
- October in Portland: nice, rainy, with clean air — a great time to visit. It ranks #6 of 12 months for Portland on SeasonMap's comfort score (77/100).
- What is the weather like in Portland in October?
- In October, Portland averages a daily high of 18.2°C and a low of 8.6°C, with about 82.4 mm of rain over roughly 11 rainy days.
- What is the air quality in Portland in October?
- Portland has a mean US Air Quality Index of about 32 in October.