October is one of the cooler months of the year in Portland, with average highs near 15.3°C and lows around 11.2°C (mean 13.3°C). It is about average for rainfall, averaging 64 mm of rainfall and 77% relative humidity across the period.
October is one of the cooler months of the year in Portland. Across 45 years of records, the warmest October in Portland was 2015 — when the month averaged 14.8°C — while the coldest was 2003 at 12°C. Typical October days reach 15.3°C with nights near 11.2°C. The long-term trend is warming, about 0.2°C per decade.
October is about average for rainfall in Portland, averaging 64 mm of rainfall. The wettest October on record was 2022 with 132 mm, while the driest was 2015 at 7 mm.
Relative humidity in Portland during October averages 77%. The most humid October was 2022 at 82%, and the least humid was 2006 at 70%.
October receives about 5.4 kWh/m²/day of solar energy in Portland. The sunniest October was 2006 at 6.2 kWh/m²/day, and the cloudiest was 2022 at 4.7.
Average wind speed in Portland during October is 5.5 m/s. The windiest October was 1988 at 7.7 m/s, while the calmest was 1983 at 4.6 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 13.0°C | 13.1°C | 13.2°C | 13.7°C | 13.4°C | +0.4°C |
| Avg High | 15.1°C | 15.1°C | 15.2°C | 15.8°C | 15.3°C | +0.2°C |
| Avg Low | 11.0°C | 11.1°C | 11.2°C | 11.5°C | 11.5°C | +0.5°C |
| Avg Rain | 69 mm | 65 mm | 63 mm | 47 mm | 85 mm | +16 mm |
October temperatures in Portland have risen by about 0.4°C between 1981–1985 and 2021–2025.
October has ranged from a record low of 7°C (2021) to a record high of 26.5°C (1987).
Rainfall in October is about average for rainfall, averaging 64 mm, with a wettest year of 132 mm.
A good time to visit Portland
October is a good time to visit Portland, with days averaging 15.3°C and nights around 11.2°C (mean 13.3°C, cooler than Portland's yearly average) and moderate rainfall. February and January are marginally more temperate, but October still suits most travellers.
| Year | Avg High | Avg Temp | Avg Low | Hottest Day | Coldest Day | Rainfall | Humidity | Wind | Solar |
|---|---|---|---|---|---|---|---|---|---|
| 2025 | 15.4°C | 13.5°C | 11.6°C | 22.4°C | 9.4°C | 61 mm | 76% | 6.3 m/s | 5.1 |
| 2024 | 16.4°C | 14.3°C | 12.2°C | 21.8°C | 9.8°C | 35 mm | 74% | 5.1 m/s | 5.6 |
| 2023 | 15.7°C | 13.7°C | 11.6°C | 22.9°C | 10.2°C | 47 mm | 72% | 5.9 m/s | 5.5 |
| 2022 🌧️ | 15.3°C | 13.6°C | 11.8°C | 20.5°C | 9.9°C | 132 mm | 82% | 5.1 m/s | 4.7 |
| 2021 | 14.5°C | 12.7°C | 10.9°C | 22.3°C | 7.0°C | 111 mm | 79% | 5.4 m/s | 5 |
| 2020 | 14.4°C | 12.6°C | 10.8°C | 20.6°C | 8.3°C | 125 mm | 81% | 5.3 m/s | 4.8 |
| 2019 | 16.0°C | 13.6°C | 11.2°C | 25.4°C | 8.9°C | 40 mm | 75% | 5.4 m/s | 5.6 |
| 2018 | 16.1°C | 14.0°C | 11.9°C | 22.3°C | 10.1°C | 22 mm | 77% | 5 m/s | 5.2 |
| 2017 | 16.2°C | 14.1°C | 12.0°C | 24.2°C | 10.8°C | 35 mm | 77% | 5.1 m/s | 5.4 |
| 2016 | 15.1°C | 12.8°C | 10.6°C | 20.4°C | 9.5°C | 74 mm | 73% | 6.7 m/s | 5.5 |
| 2015 🔥 | 17.6°C | 14.8°C | 12.0°C | 25.2°C | 9.6°C | 7 mm | 74% | 4.7 m/s | 5.7 |
| 2014 | 16.2°C | 14.0°C | 11.9°C | 23.7°C | 9.9°C | 26 mm | 77% | 5.5 m/s | 5.3 |
| 2013 | 14.9°C | 13.2°C | 11.5°C | 21.1°C | 9.8°C | 112 mm | 78% | 6.8 m/s | 4.8 |
| 2012 | 15.2°C | 13.2°C | 11.2°C | 22.8°C | 9.3°C | 43 mm | 76% | 4.9 m/s | 5.1 |
| 2011 | 15.7°C | 13.7°C | 11.7°C | 23.2°C | 10.0°C | 43 mm | 77% | 5.1 m/s | 5.1 |
| 2010 | 15.3°C | 13.1°C | 10.9°C | 20.7°C | 8.8°C | 74 mm | 77% | 5.1 m/s | 5.6 |
| 2009 | 14.5°C | 12.8°C | 11.1°C | 23.2°C | 9.6°C | 48 mm | 77% | 5.2 m/s | 5.6 |
| 2008 | 16.0°C | 13.7°C | 11.4°C | 24.3°C | 9.4°C | 27 mm | 76% | 5 m/s | 5.5 |
| 2007 | 15.1°C | 13.0°C | 10.9°C | 21.1°C | 9.1°C | 47 mm | 76% | 5.9 m/s | 5.6 |
| 2006 | 15.8°C | 13.4°C | 10.9°C | 23.8°C | 9.1°C | 24 mm | 70% | 5.4 m/s | 6.2 |
| 2005 | 16.1°C | 14.0°C | 11.9°C | 18.8°C | 8.4°C | 102 mm | 78% | 5.2 m/s | 5.2 |
| 2004 | 15.6°C | 13.6°C | 11.6°C | 23.0°C | 9.7°C | 41 mm | 77% | 5.1 m/s | 5.9 |
| 2003 ❄️ | 13.6°C | 12.0°C | 10.5°C | 21.7°C | 8.7°C | 79 mm | 77% | 5.8 m/s | 5.2 |
| 2002 | 15.2°C | 13.3°C | 11.4°C | 22.8°C | 9.1°C | 59 mm | 77% | 6 m/s | 4.9 |
| 2001 | 14.5°C | 12.8°C | 11.2°C | 20.3°C | 9.7°C | 111 mm | 77% | 6.2 m/s | 5.1 |
| 2000 | 15.1°C | 13.2°C | 11.3°C | 21.4°C | 9.1°C | 92 mm | 78% | 5.6 m/s | 5.2 |
| 1999 | 16.6°C | 14.5°C | 12.4°C | 23.2°C | 10.4°C | 59 mm | 75% | 5.5 m/s | 5.5 |
| 1998 | 14.5°C | 12.7°C | 10.8°C | 20.3°C | 8.8°C | 70 mm | 75% | 5.6 m/s | 5.6 |
| 1997 | 14.9°C | 12.9°C | 11.0°C | 22.1°C | 9.1°C | 79 mm | 76% | 5.8 m/s | 5.5 |
| 1996 | 15.2°C | 13.1°C | 11.0°C | 20.7°C | 9.5°C | 37 mm | 77% | 5.4 m/s | 5.4 |
| 1995 | 14.2°C | 12.3°C | 10.4°C | 19.7°C | 8.6°C | 32 mm | 77% | 5.7 m/s | 5.1 |
| 1994 | 15.0°C | 12.7°C | 10.5°C | 22.5°C | 7.1°C | 77 mm | 76% | 5.2 m/s | 5.5 |
| 1993 | 14.8°C | 12.8°C | 10.9°C | 19.5°C | 9.0°C | 87 mm | 74% | 5.6 m/s | 5.5 |
| 1992 | 15.3°C | 13.2°C | 11.1°C | 22.6°C | 9.2°C | 108 mm | 80% | 4.9 m/s | 5 |
| 1991 | 15.5°C | 13.5°C | 11.5°C | 21.3°C | 9.7°C | 22 mm | 78% | 5.5 m/s | 5.3 |
| 1990 | 15.1°C | 13.1°C | 11.1°C | 24.8°C | 9.3°C | 82 mm | 79% | 5 m/s | 5.1 |
| 1989 | 14.5°C | 12.5°C | 10.6°C | 19.1°C | 9.0°C | 118 mm | 78% | 6.2 m/s | 5.4 |
| 1988 | 15.5°C | 13.5°C | 11.6°C | 22.0°C | 10.2°C | 69 mm | 76% | 7.7 m/s | 5.3 |
| 1987 | 14.7°C | 12.9°C | 11.0°C | 26.5°C | 9.5°C | 49 mm | 77% | 5.3 m/s | 5.6 |
| 1986 | 14.2°C | 12.3°C | 10.4°C | 21.1°C | 8.4°C | 132 mm | 78% | 6.2 m/s | 5.6 |
| 1985 | 15.7°C | 13.5°C | 11.2°C | 20.3°C | 9.3°C | 74 mm | 77% | 5.6 m/s | 5.5 |
| 1984 | 15.2°C | 13.0°C | 10.8°C | 19.7°C | 7.9°C | 40 mm | 78% | 5.5 m/s | 5.6 |
| 1983 | 14.8°C | 13.0°C | 11.2°C | 19.9°C | 9.3°C | 37 mm | 78% | 4.6 m/s | — |
| 1982 | 15.2°C | 12.9°C | 10.6°C | 22.7°C | 8.5°C | 47 mm | 73% | 5.8 m/s | — |
| 1981 | 15.7°C | 13.4°C | 11.2°C | 21.4°C | 8.9°C | 54 mm | 76% | 5.3 m/s | — |
Actual recorded October data for each year, 1981–2025 — sourced from NASA POWER.
The average high in October is around 15.3°C with lows near 11.2°C (mean 13.3°C), based on 45 years of NASA POWER data.
October averages 64 mm of rainfall in Portland, about average for rainfall. The wettest on record was 132 mm in 2022.
The hottest October reached 26.5°C in 1987. The coldest dipped to 7°C in 2021.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average October temperatures have risen by about 0.4°C. Daytime highs moved from 15.3°C to 15.5°C and overnight lows from 11°C to 11.6°C over the same span.
October is one of the cooler months of the year in Portland and about average for rainfall, so plan for around 15.3°C daytime highs and 11.2°C at night.
Not quite — October is the 5th coolest month in Portland, averaging 13.3°C.
For October in Portland, pack light layers you can adjust through the day, with typical highs of 15.3°C and lows of 11.2°C. Bring an umbrella or light rain jacket too.
Relative humidity in October averages 77% — quite humid.
Average wind speed in October is 5.5 m/s. The windiest October on record averaged 7.7 m/s (1988).
The wettest October on record was 2022 with 132 mm. On average, October sees 64 mm.
All figures are derived from NASA POWER (Prediction Of Worldwide Energy Resources), based on MERRA-2 satellite reanalysis, covering 1981–2025.
Explore how the weather in Portland behaves each October, based on 45 years of NASA POWER climate data from 1981 to 2025. This page breaks down average temperatures, rainfall, humidity, wind and solar radiation for October specifically, along with year-by-year records and how the month has changed over the decades.
