September is one of the warmer months of the year in Port Alberni, with average highs near 17.3°C and lows around 9.4°C (mean 13.4°C). It is one of the drier months, averaging 78 mm of rainfall and 84% relative humidity across the period.
September is one of the warmer months of the year in Port Alberni. Across 45 years of records, the warmest September in Port Alberni was 2020 — when the month averaged 15.3°C — while the coldest was 1984 at 11.2°C. Typical September days reach 17.3°C with nights near 9.4°C. The long-term trend is warming, about 0.2°C per decade.
September is one of the drier months in Port Alberni, averaging 78 mm of rainfall. The wettest September on record was 1997 with 212 mm, while the driest was 1993 at 4 mm.
Relative humidity in Port Alberni during September averages 84%. The most humid September was 2010 at 89%, and the least humid was 1989 at 78%.
September receives about 3.8 kWh/m²/day of solar energy in Port Alberni. The sunniest September was 1993 at 4.8 kWh/m²/day, and the cloudiest was 2021 at 3.1.
Average wind speed in Port Alberni during September is 0.7 m/s. The windiest September was 1997 at 0.9 m/s, while the calmest were 2004, 2005 and 2017, among others at 0.6 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 12.6°C | 13.8°C | 13.0°C | 13.4°C | 14.0°C | +1.4°C |
| Avg High | 16.7°C | 17.9°C | 17.0°C | 17.1°C | 17.7°C | +1°C |
| Avg Low | 8.6°C | 9.6°C | 9.1°C | 9.7°C | 10.2°C | +1.6°C |
| Avg Rain | 76 mm | 58 mm | 74 mm | 99 mm | 88 mm | +12 mm |
September temperatures in Port Alberni have risen by about 1.6°C between 1981–1985 and 2021–2025.
September has ranged from a record low of 0.7°C (1983) to a record high of 30.4°C (2008).
Rainfall in September is one of the drier months, averaging 78 mm, with a wettest year of 212 mm.
One of the best times to visit Port Alberni
September is one of the best times to visit Port Alberni. Expect days averaging 17.3°C and nights around 9.4°C (mean 13.4°C) — warmer than Port Alberni's yearly average — with moderate rainfall (78 mm), so conditions are generally comfortable for sightseeing and outdoor plans.
| Year | Avg High | Avg Temp | Avg Low | Hottest Day | Coldest Day | Rainfall | Humidity | Wind | Solar |
|---|---|---|---|---|---|---|---|---|---|
| 2025 | 18.4°C | 14.7°C | 11.0°C | 25.3°C | 6.8°C | 103 mm | 88% | 0.7 m/s | 3.6 |
| 2024 | 17.5°C | 13.6°C | 9.7°C | 29.0°C | 4.6°C | 77 mm | 86% | 0.7 m/s | 3.6 |
| 2023 | 16.8°C | 13.1°C | 9.3°C | 24.8°C | 4.3°C | 82 mm | 85% | 0.8 m/s | 3.8 |
| 2022 | 18.6°C | 14.4°C | 10.2°C | 23.6°C | 6.8°C | 30 mm | 83% | 0.7 m/s | 4.4 |
| 2021 | 16.0°C | 12.8°C | 9.5°C | 23.6°C | 4.8°C | 155 mm | 88% | 0.8 m/s | 3.1 |
| 2020 🔥 | 18.9°C | 15.3°C | 11.6°C | 29.0°C | 8.3°C | 84 mm | 86% | 0.7 m/s | 3.5 |
| 2019 | 16.8°C | 13.5°C | 10.1°C | 24.3°C | 4.5°C | 132 mm | 88% | 0.8 m/s | 3.2 |
| 2018 | 15.8°C | 12.5°C | 9.2°C | 23.2°C | 5.9°C | 170 mm | 88% | 0.8 m/s | 3.2 |
| 2017 | 18.1°C | 14.2°C | 10.4°C | 27.2°C | 5.9°C | 55 mm | 85% | 0.6 m/s | 3.6 |
| 2016 | 16.1°C | 12.4°C | 8.8°C | 22.4°C | 4.4°C | 69 mm | 86% | 0.7 m/s | 3.6 |
| 2015 | 15.9°C | 12.2°C | 8.5°C | 24.2°C | 4.2°C | 98 mm | 87% | 0.8 m/s | 3.4 |
| 2014 | 18.7°C | 14.6°C | 10.5°C | 27.5°C | 7.8°C | 65 mm | 82% | 0.7 m/s | 3.9 |
| 2013 | 17.8°C | 14.3°C | 10.7°C | 28.0°C | 5.1°C | 140 mm | 87% | 0.8 m/s | 3.5 |
| 2012 | 18.6°C | 13.9°C | 9.1°C | 26.4°C | 4.8°C | 14 mm | 80% | 0.7 m/s | 4.4 |
| 2011 | 17.7°C | 14.0°C | 10.2°C | 27.3°C | 6.3°C | 101 mm | 86% | 0.8 m/s | 3.7 |
| 2010 | 15.8°C | 12.5°C | 9.3°C | 20.0°C | 6.1°C | 143 mm | 89% | 0.7 m/s | 3.2 |
| 2009 | 16.5°C | 12.7°C | 9.0°C | 22.7°C | 3.7°C | 95 mm | 85% | 0.8 m/s | 3.6 |
| 2008 | 17.8°C | 13.5°C | 9.2°C | 30.4°C | 6.3°C | 31 mm | 82% | 0.7 m/s | 4 |
| 2007 | 16.5°C | 12.7°C | 8.8°C | 26.5°C | 4.7°C | 100 mm | 86% | 0.7 m/s | 3.6 |
| 2006 | 18.3°C | 13.8°C | 9.2°C | 29.2°C | 6.0°C | 58 mm | 82% | 0.7 m/s | 4.2 |
| 2005 | 15.8°C | 12.1°C | 8.4°C | 20.0°C | 4.3°C | 58 mm | 86% | 0.6 m/s | 3.9 |
| 2004 | 16.1°C | 12.5°C | 9.0°C | 20.1°C | 6.0°C | 125 mm | 87% | 0.6 m/s | 3.4 |
| 2003 | 18.1°C | 14.0°C | 9.9°C | 28.6°C | 6.7°C | 54 mm | 84% | 0.6 m/s | 3.9 |
| 2002 | 17.0°C | 12.9°C | 8.9°C | 23.3°C | 4.2°C | 68 mm | 84% | 0.6 m/s | 3.9 |
| 2001 | 16.7°C | 12.9°C | 9.1°C | 23.0°C | 6.9°C | 64 mm | 86% | 0.6 m/s | 3.8 |
| 2000 | 16.7°C | 13.0°C | 9.3°C | 22.6°C | 5.0°C | 87 mm | 83% | 0.6 m/s | 3.6 |
| 1999 | 17.3°C | 12.7°C | 8.1°C | 22.8°C | 3.4°C | 46 mm | 81% | 0.8 m/s | 4.5 |
| 1998 | 18.3°C | 13.9°C | 9.5°C | 23.3°C | 7.0°C | 30 mm | 84% | 0.6 m/s | 4.1 |
| 1997 🌧️ | 17.8°C | 14.4°C | 10.9°C | 25.2°C | 8.1°C | 212 mm | 86% | 0.9 m/s | 3.5 |
| 1996 | 15.5°C | 11.9°C | 8.4°C | 20.8°C | 3.6°C | 88 mm | 85% | 0.7 m/s | 3.5 |
| 1995 | 19.0°C | 15.0°C | 10.9°C | 24.9°C | 7.7°C | 35 mm | 83% | 0.7 m/s | 4.1 |
| 1994 | 18.2°C | 14.5°C | 10.8°C | 25.2°C | 7.6°C | 88 mm | 86% | 0.7 m/s | 3.6 |
| 1993 | 19.0°C | 14.3°C | 9.5°C | 25.3°C | 4.9°C | 4 mm | 79% | 0.6 m/s | 4.8 |
| 1992 | 15.3°C | 11.6°C | 7.9°C | 21.1°C | 3.0°C | 68 mm | 84% | 0.7 m/s | 3.7 |
| 1991 | 18.9°C | 14.4°C | 9.8°C | 26.3°C | 4.9°C | 5 mm | 80% | 0.6 m/s | 4.3 |
| 1990 | 19.7°C | 15.0°C | 10.2°C | 27.0°C | 6.3°C | 7 mm | 80% | 0.6 m/s | 4.3 |
| 1989 | 19.6°C | 14.6°C | 9.5°C | 28.4°C | 6.6°C | 11 mm | 78% | 0.7 m/s | 4.5 |
| 1988 | 16.8°C | 12.5°C | 8.3°C | 26.1°C | 4.2°C | 110 mm | 85% | 0.7 m/s | 3.8 |
| 1987 | 18.1°C | 13.9°C | 9.6°C | 24.8°C | 6.2°C | 44 mm | 83% | 0.6 m/s | 3.9 |
| 1986 | 15.6°C | 12.0°C | 8.3°C | 22.8°C | 5.5°C | 67 mm | 85% | 0.6 m/s | 3.8 |
| 1985 | 15.8°C | 11.7°C | 7.6°C | 22.0°C | 5.0°C | 61 mm | 81% | 0.8 m/s | 3.8 |
| 1984 ❄️ | 14.6°C | 11.2°C | 7.9°C | 18.3°C | 4.9°C | 93 mm | 85% | 0.7 m/s | 3.4 |
| 1983 | 15.5°C | 11.3°C | 7.1°C | 21.6°C | 0.7°C | 69 mm | 83% | 0.7 m/s | — |
| 1982 | 18.0°C | 13.8°C | 9.7°C | 26.9°C | 4.7°C | 55 mm | 83% | 0.7 m/s | — |
| 1981 | 16.4°C | 12.7°C | 9.0°C | 28.5°C | 4.7°C | 173 mm | 85% | 0.8 m/s | — |
Actual recorded September data for each year, 1981–2025 — sourced from NASA POWER.
The average high in September is around 17.3°C with lows near 9.4°C (mean 13.4°C), based on 45 years of NASA POWER data.
September averages 78 mm of rainfall in Port Alberni, one of the drier months. The wettest on record was 212 mm in 1997.
The hottest September reached 30.4°C in 2008. The coldest dipped to 0.7°C in 1983.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average September temperatures have risen by about 1.6°C. Daytime highs moved from 16.1°C to 17.5°C and overnight lows from 8.3°C to 9.9°C over the same span.
September is one of the warmer months of the year in Port Alberni and one of the drier months, so plan for around 17.3°C daytime highs and 9.4°C at night.
Not quite — September is the 10th coolest month in Port Alberni, averaging 13.4°C.
For September in Port Alberni, pack light layers you can adjust through the day, with typical highs of 17.3°C and lows of 9.4°C. Bring an umbrella or light rain jacket too.
Relative humidity in September averages 84% — quite humid.
Average wind speed in September is 0.7 m/s. The windiest September on record averaged 0.9 m/s (1997).
The wettest September on record was 1997 with 212 mm. On average, September sees 78 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 Port Alberni behaves each September, 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 September specifically, along with year-by-year records and how the month has changed over the decades.
