October is one of the warmer months of the year in Portland, with average highs near 13.1°C and lows around 9.1°C (mean 11.1°C). It is a relatively wet time of year, averaging 124 mm of rainfall and 80% relative humidity across the period.
October is one of the warmer months of the year in Portland. Across 45 years of records, the warmest October in Portland was 2017 — when the month averaged 14.2°C — while the coldest was 1988 at 9.2°C. Typical October days reach 13.1°C with nights near 9.1°C. The long-term trend is warming, about 0.6°C per decade.
October is a relatively wet time of year in Portland, averaging 124 mm of rainfall. The wettest October on record was 2005 with 361 mm, while the driest was 1994 at 30 mm.
Relative humidity in Portland during October averages 80%. The most humid October was 2005 at 87%, and the least humid was 2002 at 75%.
October receives about 2.8 kWh/m²/day of solar energy in Portland. The sunniest October was 1994 at 3.3 kWh/m²/day, and the cloudiest was 2005 at 2.2.
Average wind speed in Portland during October is 3.9 m/s. The windiest Octobers were 1988 and 1996 at 4.5 m/s, while the calmest were 2013 and 2023 at 3.2 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 10.3°C | 10.5°C | 10.8°C | 11.9°C | 12.5°C | +2.2°C |
| Avg High | 12.5°C | 12.6°C | 12.8°C | 13.9°C | 14.4°C | +1.9°C |
| Avg Low | 8.1°C | 8.4°C | 8.8°C | 10.0°C | 10.6°C | +2.5°C |
| Avg Rain | 85 mm | 126 mm | 140 mm | 142 mm | 120 mm | +35 mm |
October temperatures in Portland have risen by about 2.1°C between 1981–1985 and 2021–2025.
October has ranged from a record low of 0.9°C (1988) to a record high of 20.9°C (2011).
Rainfall in October is a relatively wet time of year, averaging 124 mm, with a wettest year of 361 mm.
A good time to visit Portland
October is a good time to visit Portland, with days averaging 13.1°C and nights around 9.1°C (mean 11.1°C, warmer than Portland's yearly average) and higher rainfall. August and July 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 | 14.5°C | 12.5°C | 10.4°C | 20.4°C | 7.0°C | 84 mm | 79% | 4.1 m/s | 3.1 |
| 2024 | 14.3°C | 12.1°C | 10.0°C | 18.3°C | 3.8°C | 45 mm | 78% | 3.6 m/s | 3.1 |
| 2023 | 15.0°C | 13.2°C | 11.3°C | 20.7°C | 4.2°C | 116 mm | 86% | 3.2 m/s | 2.6 |
| 2022 | 14.2°C | 12.4°C | 10.6°C | 18.3°C | 6.4°C | 122 mm | 83% | 3.3 m/s | 2.9 |
| 2021 | 15.2°C | 13.7°C | 12.1°C | 20.0°C | 7.5°C | 191 mm | 83% | 3.7 m/s | 2.6 |
| 2020 | 13.3°C | 11.3°C | 9.4°C | 18.5°C | 2.0°C | 164 mm | 81% | 3.7 m/s | 2.6 |
| 2019 | 13.7°C | 12.0°C | 10.2°C | 17.8°C | 7.4°C | 160 mm | 84% | 4 m/s | 2.5 |
| 2018 | 12.7°C | 10.6°C | 8.5°C | 20.9°C | 2.4°C | 140 mm | 80% | 4.2 m/s | 2.4 |
| 2017 🔥 | 16.2°C | 14.2°C | 12.2°C | 19.9°C | 7.3°C | 226 mm | 82% | 3.7 m/s | 3.1 |
| 2016 | 13.7°C | 11.6°C | 9.6°C | 18.3°C | 5.1°C | 167 mm | 82% | 4 m/s | 2.8 |
| 2015 | 12.9°C | 10.7°C | 8.5°C | 16.2°C | 2.4°C | 91 mm | 77% | 4.2 m/s | 3 |
| 2014 | 14.2°C | 12.5°C | 10.8°C | 17.6°C | 6.3°C | 159 mm | 83% | 4 m/s | 2.6 |
| 2013 | 13.9°C | 11.9°C | 9.9°C | 19.6°C | 3.5°C | 35 mm | 79% | 3.2 m/s | 2.9 |
| 2012 | 14.2°C | 12.4°C | 10.7°C | 17.8°C | 5.0°C | 100 mm | 83% | 3.8 m/s | 2.5 |
| 2011 | 13.8°C | 12.0°C | 10.2°C | 20.9°C | 3.3°C | 169 mm | 82% | 4.1 m/s | 2.6 |
| 2010 | 13.3°C | 11.2°C | 9.1°C | 19.3°C | 3.6°C | 176 mm | 79% | 4.4 m/s | 2.8 |
| 2009 | 11.8°C | 10.0°C | 8.1°C | 17.0°C | 4.1°C | 140 mm | 81% | 4 m/s | 2.5 |
| 2008 | 12.6°C | 10.6°C | 8.6°C | 16.6°C | 2.7°C | 77 mm | 81% | 4 m/s | 3 |
| 2007 | 14.4°C | 12.5°C | 10.6°C | 20.2°C | 3.5°C | 153 mm | 83% | 3.4 m/s | 2.9 |
| 2006 | 12.9°C | 10.9°C | 8.9°C | 16.9°C | 5.0°C | 190 mm | 80% | 4.3 m/s | 2.9 |
| 2005 🌧️ | 12.8°C | 11.1°C | 9.4°C | 18.5°C | 3.8°C | 361 mm | 87% | 4.3 m/s | 2.2 |
| 2004 | 12.5°C | 10.7°C | 9.0°C | 15.7°C | 5.5°C | 70 mm | 82% | 3.7 m/s | 3 |
| 2003 | 12.3°C | 10.3°C | 8.4°C | 15.5°C | 4.0°C | 177 mm | 81% | 3.9 m/s | 2.8 |
| 2002 | 12.4°C | 10.3°C | 8.3°C | 20.7°C | 2.5°C | 103 mm | 75% | 4 m/s | 3 |
| 2001 | 13.6°C | 11.2°C | 8.8°C | 19.1°C | 3.2°C | 46 mm | 78% | 3.5 m/s | 3.1 |
| 2000 | 12.7°C | 10.4°C | 8.2°C | 18.3°C | 2.3°C | 88 mm | 82% | 3.8 m/s | 2.8 |
| 1999 | 12.6°C | 10.3°C | 8.0°C | 16.5°C | 3.2°C | 114 mm | 80% | 4.2 m/s | 3 |
| 1998 | 12.2°C | 10.4°C | 8.5°C | 17.5°C | 5.9°C | 224 mm | 80% | 4.3 m/s | 3 |
| 1997 | 12.4°C | 10.3°C | 8.1°C | 18.5°C | 3.0°C | 37 mm | 77% | 3.4 m/s | 2.9 |
| 1996 | 12.0°C | 9.8°C | 7.7°C | 14.7°C | 3.3°C | 244 mm | 80% | 4.5 m/s | 3 |
| 1995 | 14.1°C | 12.1°C | 10.1°C | 18.2°C | 4.5°C | 145 mm | 83% | 3.8 m/s | 2.8 |
| 1994 | 13.1°C | 11.0°C | 8.8°C | 15.6°C | 5.7°C | 30 mm | 78% | 3.6 m/s | 3.3 |
| 1993 | 11.4°C | 9.3°C | 7.2°C | 15.9°C | 3.3°C | 104 mm | 78% | 4.2 m/s | 2.8 |
| 1992 | 11.4°C | 9.3°C | 7.2°C | 17.5°C | 3.0°C | 87 mm | 78% | 3.7 m/s | 2.7 |
| 1991 | 13.0°C | 11.1°C | 9.1°C | 17.1°C | 2.6°C | 82 mm | 85% | 4.4 m/s | 2.9 |
| 1990 | 13.9°C | 11.7°C | 9.6°C | 18.8°C | 3.4°C | 189 mm | 83% | 4.1 m/s | 2.8 |
| 1989 | 12.6°C | 10.4°C | 8.2°C | 16.4°C | 4.5°C | 131 mm | 82% | 3.9 m/s | 2.8 |
| 1988 ❄️ | 11.1°C | 9.2°C | 7.2°C | 17.6°C | 0.9°C | 91 mm | 78% | 4.5 m/s | 2.7 |
| 1987 | 12.1°C | 9.9°C | 7.6°C | 15.1°C | 3.5°C | 72 mm | 81% | 3.8 m/s | 3.1 |
| 1986 | 12.4°C | 10.1°C | 7.8°C | 17.9°C | 3.0°C | 45 mm | 78% | 3.7 m/s | 2.9 |
| 1985 | 13.1°C | 11.0°C | 8.9°C | 16.9°C | 2.5°C | 79 mm | 77% | 3.9 m/s | 2.8 |
| 1984 | 13.2°C | 11.1°C | 9.0°C | 17.5°C | 4.0°C | 83 mm | 82% | 3.5 m/s | 2.9 |
| 1983 | 13.0°C | 10.8°C | 8.7°C | 19.8°C | 3.4°C | 85 mm | 76% | 3.7 m/s | — |
| 1982 | 13.0°C | 10.7°C | 8.4°C | 17.8°C | 3.8°C | 51 mm | 77% | 3.6 m/s | — |
| 1981 | 11.8°C | 9.7°C | 7.5°C | 13.9°C | 3.0°C | 128 mm | 79% | 3.9 m/s | — |
Actual recorded October data for each year, 1981–2025 — sourced from NASA POWER.
The average high in October is around 13.1°C with lows near 9.1°C (mean 11.1°C), based on 45 years of NASA POWER data.
October averages 124 mm of rainfall in Portland, a relatively wet time of year. The wettest on record was 361 mm in 2005.
The hottest October reached 20.9°C in 2011. The coldest dipped to 0.9°C in 1988.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average October temperatures have risen by about 2.1°C. Daytime highs moved from 12.8°C to 14.6°C and overnight lows from 8.5°C to 10.9°C over the same span.
October is one of the warmer months of the year in Portland and a relatively wet time of year, so plan for around 13.1°C daytime highs and 9.1°C at night.
Not quite — October is the 8th coolest month in Portland, averaging 11.1°C.
For October in Portland, pack light layers you can adjust through the day, with typical highs of 13.1°C and lows of 9.1°C. Bring an umbrella or light rain jacket too.
Relative humidity in October averages 80% — quite humid.
Average wind speed in October is 3.9 m/s. The windiest October on record averaged 4.5 m/s (1988).
The wettest October on record was 2005 with 361 mm. On average, October sees 124 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.
