August is one of the warmer months of the year in Port Alberni, with average highs near 19.7°C and lows around 11.3°C (mean 15.5°C). It is one of the drier months, averaging 50 mm of rainfall and 83% relative humidity across the period.
August is one of the warmer months of the year in Port Alberni. Across 45 years of records, the warmest August in Port Alberni was 2022 — when the month averaged 17.5°C — while the coldest was 1995 at 13.3°C. Typical August days reach 19.7°C with nights near 11.3°C. The long-term trend is warming, about 0.4°C per decade.
August is one of the drier months in Port Alberni, averaging 50 mm of rainfall. The wettest August on record was 1991 with 198 mm, while the driest was 1986 at 6 mm.
Relative humidity in Port Alberni during August averages 83%. The most humid August was 2013 at 87%, and the least humid was 1981 at 79%.
August receives about 5.2 kWh/m²/day of solar energy in Port Alberni. The sunniest August was 2006 at 6 kWh/m²/day, and the cloudiest was 1984 at 4.3.
Average wind speed in Port Alberni during August is 0.6 m/s. The windiest Augusts were 1995 and 2020 at 0.7 m/s, while the calmest were 2014, 2017 and 2018, among others at 0.5 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 14.9°C | 15.3°C | 15.1°C | 16.0°C | 16.3°C | +1.4°C |
| Avg High | 19.4°C | 19.3°C | 19.2°C | 20.3°C | 20.7°C | +1.3°C |
| Avg Low | 10.5°C | 11.4°C | 11.0°C | 11.7°C | 12.0°C | +1.5°C |
| Avg Rain | 32 mm | 68 mm | 47 mm | 49 mm | 56 mm | +24 mm |
August temperatures in Port Alberni have risen by about 1.9°C between 1981–1985 and 2021–2025.
August has ranged from a record low of 6.1°C (1985) to a record high of 34.9°C (1981).
Rainfall in August is one of the drier months, averaging 50 mm, with a wettest year of 198 mm.
One of the best times to visit Port Alberni
August is one of the best times to visit Port Alberni. Expect days averaging 19.7°C and nights around 11.3°C (mean 15.5°C) — warmer than Port Alberni's yearly average — with moderate rainfall (50 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 | 21.0°C | 16.6°C | 12.2°C | 30.7°C | 8.5°C | 67 mm | 84% | 0.6 m/s | 5.3 |
| 2024 | 20.3°C | 16.1°C | 11.9°C | 27.2°C | 7.4°C | 90 mm | 85% | 0.6 m/s | 4.9 |
| 2023 | 21.4°C | 16.9°C | 12.4°C | 29.3°C | 8.9°C | 58 mm | 82% | 0.6 m/s | 5.3 |
| 2022 🔥 | 22.1°C | 17.5°C | 12.9°C | 28.5°C | 9.2°C | 32 mm | 83% | 0.6 m/s | 5.6 |
| 2021 | 20.3°C | 16.0°C | 11.7°C | 30.1°C | 7.5°C | 19 mm | 83% | 0.6 m/s | 5.4 |
| 2020 | 18.9°C | 14.9°C | 11.0°C | 25.5°C | 7.3°C | 73 mm | 85% | 0.7 m/s | 5.2 |
| 2019 | 20.4°C | 16.3°C | 12.2°C | 26.8°C | 8.9°C | 88 mm | 84% | 0.6 m/s | 5 |
| 2018 | 21.0°C | 16.5°C | 12.0°C | 28.7°C | 8.6°C | 30 mm | 82% | 0.5 m/s | 5.5 |
| 2017 | 21.7°C | 17.0°C | 12.4°C | 28.8°C | 8.9°C | 27 mm | 82% | 0.5 m/s | 5.7 |
| 2016 | 21.1°C | 16.5°C | 12.0°C | 33.5°C | 9.9°C | 65 mm | 83% | 0.6 m/s | 5.3 |
| 2015 | 20.1°C | 15.9°C | 11.7°C | 28.7°C | 8.6°C | 78 mm | 83% | 0.6 m/s | 5.3 |
| 2014 | 21.5°C | 17.1°C | 12.6°C | 26.4°C | 10.4°C | 21 mm | 82% | 0.5 m/s | 5.5 |
| 2013 | 18.8°C | 15.2°C | 11.7°C | 24.3°C | 8.1°C | 87 mm | 87% | 0.5 m/s | 4.5 |
| 2012 | 20.0°C | 15.7°C | 11.3°C | 30.4°C | 7.7°C | 25 mm | 83% | 0.6 m/s | 5.2 |
| 2011 | 18.8°C | 14.8°C | 10.7°C | 23.7°C | 8.5°C | 27 mm | 84% | 0.5 m/s | 5.4 |
| 2010 | 19.7°C | 15.2°C | 10.7°C | 32.2°C | 6.4°C | 38 mm | 82% | 0.6 m/s | 5.5 |
| 2009 | 19.1°C | 15.0°C | 10.9°C | 27.1°C | 8.3°C | 34 mm | 84% | 0.5 m/s | 5.1 |
| 2008 | 18.5°C | 14.5°C | 10.4°C | 28.6°C | 6.3°C | 80 mm | 85% | 0.6 m/s | 4.8 |
| 2007 | 18.6°C | 14.8°C | 11.0°C | 24.0°C | 8.4°C | 34 mm | 85% | 0.6 m/s | 4.8 |
| 2006 | 19.6°C | 14.8°C | 10.0°C | 25.3°C | 8.1°C | 9 mm | 81% | 0.5 m/s | 6 |
| 2005 | 20.7°C | 16.2°C | 11.7°C | 25.3°C | 8.5°C | 26 mm | 81% | 0.5 m/s | 5.7 |
| 2004 | 20.3°C | 16.4°C | 12.5°C | 26.7°C | 10.7°C | 82 mm | 85% | 0.5 m/s | 4.9 |
| 2003 | 19.6°C | 15.4°C | 11.2°C | 25.2°C | 9.1°C | 14 mm | 82% | 0.5 m/s | 5.6 |
| 2002 | 19.9°C | 15.4°C | 10.9°C | 28.0°C | 8.0°C | 16 mm | 82% | 0.5 m/s | 5.6 |
| 2001 | 18.0°C | 14.6°C | 11.1°C | 24.8°C | 8.9°C | 134 mm | 87% | 0.6 m/s | 4.5 |
| 2000 | 18.1°C | 14.1°C | 10.2°C | 24.1°C | 7.2°C | 42 mm | 85% | 0.5 m/s | 5.2 |
| 1999 | 18.7°C | 15.0°C | 11.3°C | 25.5°C | 6.2°C | 59 mm | 87% | 0.5 m/s | 5 |
| 1998 | 19.9°C | 15.7°C | 11.6°C | 27.0°C | 9.6°C | 16 mm | 84% | 0.6 m/s | 5.5 |
| 1997 | 20.7°C | 16.6°C | 12.6°C | 29.7°C | 9.0°C | 115 mm | 83% | 0.5 m/s | 5.1 |
| 1996 | 19.0°C | 14.9°C | 10.8°C | 26.7°C | 8.3°C | 41 mm | 84% | 0.6 m/s | 4.8 |
| 1995 ❄️ | 16.6°C | 13.3°C | 10.0°C | 21.4°C | 7.9°C | 76 mm | 87% | 0.7 m/s | 4.6 |
| 1994 | 19.1°C | 15.2°C | 11.3°C | 22.7°C | 8.7°C | 35 mm | 84% | 0.6 m/s | 4.7 |
| 1993 | 19.9°C | 15.6°C | 11.3°C | 30.2°C | 8.0°C | 54 mm | 82% | 0.6 m/s | 5.1 |
| 1992 | 19.6°C | 15.4°C | 11.2°C | 24.9°C | 7.9°C | 42 mm | 83% | 0.5 m/s | 5.4 |
| 1991 🌧️ | 19.0°C | 15.3°C | 11.6°C | 25.7°C | 9.0°C | 198 mm | 86% | 0.6 m/s | 5 |
| 1990 | 20.3°C | 16.1°C | 12.0°C | 28.6°C | 8.1°C | 43 mm | 82% | 0.5 m/s | 5.2 |
| 1989 | 18.0°C | 14.3°C | 10.6°C | 22.1°C | 9.2°C | 45 mm | 87% | 0.5 m/s | 4.9 |
| 1988 | 18.9°C | 14.6°C | 10.3°C | 26.2°C | 6.9°C | 33 mm | 83% | 0.5 m/s | 4.9 |
| 1987 | 20.1°C | 15.3°C | 10.4°C | 30.3°C | 8.1°C | 12 mm | 81% | 0.5 m/s | 5.8 |
| 1986 | 21.8°C | 16.7°C | 11.7°C | 28.6°C | 7.7°C | 6 mm | 80% | 0.5 m/s | 5.8 |
| 1985 | 18.7°C | 14.2°C | 9.7°C | 25.8°C | 6.1°C | 34 mm | 80% | 0.6 m/s | 5.3 |
| 1984 | 17.1°C | 13.4°C | 9.7°C | 21.7°C | 7.7°C | 34 mm | 85% | 0.6 m/s | 4.3 |
| 1983 | 19.3°C | 14.9°C | 10.6°C | 26.1°C | 8.5°C | 37 mm | 81% | 0.6 m/s | — |
| 1982 | 18.5°C | 14.2°C | 9.9°C | 27.6°C | 7.1°C | 44 mm | 82% | 0.6 m/s | — |
| 1981 | 21.8°C | 16.9°C | 12.0°C | 34.9°C | 8.4°C | 47 mm | 79% | 0.5 m/s | — |
Actual recorded August data for each year, 1981–2025 — sourced from NASA POWER.
The average high in August is around 19.7°C with lows near 11.3°C (mean 15.5°C), based on 45 years of NASA POWER data.
August averages 50 mm of rainfall in Port Alberni, one of the drier months. The wettest on record was 198 mm in 1991.
The hottest August reached 34.9°C in 1981. The coldest dipped to 6.1°C in 1985.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average August temperatures have risen by about 1.9°C. Daytime highs moved from 19.1°C to 21°C and overnight lows from 10.4°C to 12.2°C over the same span.
August is one of the warmer months of the year in Port Alberni and one of the drier months, so plan for around 19.7°C daytime highs and 11.3°C at night.
Not quite — August is the 12th coolest month in Port Alberni, averaging 15.5°C.
For August in Port Alberni, pack light layers you can adjust through the day, with typical highs of 19.7°C and lows of 11.3°C. Bring an umbrella or light rain jacket too.
Relative humidity in August averages 83% — quite humid.
Average wind speed in August is 0.6 m/s. The windiest August on record averaged 0.7 m/s (1995).
The wettest August on record was 1991 with 198 mm. On average, August sees 50 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 August, 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 August specifically, along with year-by-year records and how the month has changed over the decades.
