August is one of the warmer months of the year in Chilliwack, with average highs near 20.9°C and lows around 10.8°C (mean 15.9°C). It is one of the drier months, averaging 53 mm of rainfall and 78% relative humidity across the period.
August is one of the warmer months of the year in Chilliwack. Across 45 years of records, the warmest August in Chilliwack was 2022 — when the month averaged 18.5°C — while the coldest was 1995 at 12.5°C. Typical August days reach 20.9°C with nights near 10.8°C. The long-term trend is warming, about 0.4°C per decade.
August is one of the drier months in Chilliwack, averaging 53 mm of rainfall. The wettest August on record was 2008 with 163 mm, while the driest was 2012 at 10 mm.
Relative humidity in Chilliwack during August averages 78%. The most humid August was 1991 at 84%, and the least humid was 2017 at 71%.
August receives about 5.4 kWh/m²/day of solar energy in Chilliwack. The sunniest Augusts were 1998 and 2005 at 6.1 kWh/m²/day, and the cloudiest were 1995 and 2021 at 4.7.
Average wind speed in Chilliwack during August is 0.3 m/s. The windiest Augusts were 2020, 2022 and 2023, among others at 0.3 m/s, while the calmest were 2021, 2024 and 2025, among others at 0.2 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 15.4°C | 15.5°C | 15.5°C | 16.5°C | 16.6°C | +1.2°C |
| Avg High | 20.5°C | 20.5°C | 20.5°C | 21.6°C | 21.7°C | +1.2°C |
| Avg Low | 10.2°C | 10.6°C | 10.5°C | 11.5°C | 11.5°C | +1.3°C |
| Avg Rain | 46 mm | 61 mm | 58 mm | 39 mm | 67 mm | +21 mm |
August temperatures in Chilliwack have risen by about 1.6°C between 1981–1985 and 2021–2025.
August has ranged from a record low of 4.3°C (1995) to a record high of 36.2°C (2025).
Rainfall in August is one of the drier months, averaging 53 mm, with a wettest year of 163 mm.
One of the best times to visit Chilliwack
August is one of the best times to visit Chilliwack. Expect days averaging 20.9°C and nights around 10.8°C (mean 15.9°C) — warmer than Chilliwack's yearly average — with moderate rainfall (53 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 | 21.1°C | 16.1°C | 11.1°C | 36.2°C | 6.5°C | 97 mm | 84% | 0.2 m/s | 5.3 |
| 2024 | 21.3°C | 16.4°C | 11.4°C | 31.7°C | 5.6°C | 122 mm | 80% | 0.2 m/s | 5 |
| 2023 | 23.2°C | 17.5°C | 11.8°C | 32.7°C | 6.9°C | 51 mm | 75% | 0.3 m/s | 5.4 |
| 2022 🔥 | 23.9°C | 18.5°C | 13.2°C | 33.3°C | 8.6°C | 31 mm | 76% | 0.3 m/s | 5.7 |
| 2021 | 20.7°C | 16.0°C | 11.2°C | 32.3°C | 5.3°C | 63 mm | 80% | 0.2 m/s | 4.7 |
| 2020 | 19.8°C | 15.0°C | 10.2°C | 31.7°C | 5.4°C | 39 mm | 81% | 0.3 m/s | 5.8 |
| 2019 | 21.2°C | 16.3°C | 11.4°C | 27.8°C | 8.8°C | 35 mm | 77% | 0.3 m/s | 5.3 |
| 2018 | 22.0°C | 16.9°C | 11.7°C | 31.1°C | 6.4°C | 23 mm | 72% | 0.3 m/s | 5.1 |
| 2017 | 24.0°C | 18.4°C | 12.7°C | 32.1°C | 8.6°C | 11 mm | 71% | 0.3 m/s | 5.9 |
| 2016 | 21.2°C | 16.2°C | 11.1°C | 31.7°C | 7.2°C | 30 mm | 77% | 0.3 m/s | 5.7 |
| 2015 | 21.6°C | 16.7°C | 11.8°C | 30.9°C | 8.2°C | 98 mm | 71% | 0.3 m/s | 5.2 |
| 2014 | 22.8°C | 17.6°C | 12.5°C | 35.2°C | 8.5°C | 47 mm | 77% | 0.3 m/s | 5.2 |
| 2013 | 21.4°C | 16.7°C | 12.0°C | 26.4°C | 7.9°C | 64 mm | 80% | 0.3 m/s | 5 |
| 2012 | 21.8°C | 16.4°C | 11.1°C | 30.8°C | 5.7°C | 10 mm | 77% | 0.3 m/s | 5.9 |
| 2011 | 19.7°C | 14.8°C | 10.0°C | 27.2°C | 6.3°C | 21 mm | 79% | 0.3 m/s | 5.9 |
| 2010 | 19.9°C | 15.1°C | 10.2°C | 31.2°C | 5.2°C | 50 mm | 79% | 0.2 m/s | 5.2 |
| 2009 | 20.6°C | 15.6°C | 10.7°C | 32.0°C | 6.6°C | 44 mm | 78% | 0.2 m/s | 5.4 |
| 2008 🌧️ | 20.2°C | 15.3°C | 10.5°C | 33.2°C | 4.9°C | 163 mm | 80% | 0.2 m/s | 4.9 |
| 2007 | 18.9°C | 14.3°C | 9.6°C | 30.0°C | 6.7°C | 34 mm | 81% | 0.3 m/s | 5.2 |
| 2006 | 20.5°C | 15.3°C | 10.1°C | 27.4°C | 6.9°C | 16 mm | 73% | 0.3 m/s | 5.9 |
| 2005 | 21.8°C | 16.5°C | 11.2°C | 28.9°C | 7.7°C | 38 mm | 73% | 0.3 m/s | 6.1 |
| 2004 | 22.3°C | 17.5°C | 12.7°C | 31.7°C | 7.7°C | 127 mm | 78% | 0.2 m/s | 5 |
| 2003 | 21.5°C | 16.0°C | 10.5°C | 29.6°C | 5.9°C | 13 mm | 74% | 0.3 m/s | 5.9 |
| 2002 | 20.3°C | 15.2°C | 10.2°C | 28.2°C | 6.1°C | 25 mm | 78% | 0.3 m/s | 5.7 |
| 2001 | 20.1°C | 15.4°C | 10.8°C | 29.0°C | 7.1°C | 78 mm | 80% | 0.3 m/s | 5.3 |
| 2000 | 18.4°C | 13.7°C | 9.1°C | 26.6°C | 4.8°C | 47 mm | 82% | 0.3 m/s | 5.9 |
| 1999 | 20.4°C | 15.9°C | 11.3°C | 29.4°C | 6.2°C | 75 mm | 82% | 0.2 m/s | 5.1 |
| 1998 | 21.3°C | 16.2°C | 11.1°C | 28.3°C | 5.8°C | 14 mm | 78% | 0.3 m/s | 6.1 |
| 1997 | 22.1°C | 16.8°C | 11.5°C | 29.3°C | 8.5°C | 38 mm | 79% | 0.3 m/s | 5.6 |
| 1996 | 20.6°C | 15.7°C | 10.8°C | 31.6°C | 6.7°C | 62 mm | 75% | 0.3 m/s | 5.2 |
| 1995 ❄️ | 16.7°C | 12.5°C | 8.2°C | 22.4°C | 4.3°C | 83 mm | 82% | 0.2 m/s | 4.7 |
| 1994 | 20.6°C | 15.5°C | 10.4°C | 30.0°C | 7.3°C | 29 mm | 76% | 0.3 m/s | 5.2 |
| 1993 | 20.0°C | 14.9°C | 9.9°C | 30.7°C | 5.9°C | 43 mm | 80% | 0.3 m/s | 4.9 |
| 1992 | 21.6°C | 16.2°C | 10.8°C | 32.4°C | 6.3°C | 47 mm | 74% | 0.3 m/s | 5.7 |
| 1991 | 20.0°C | 15.5°C | 11.1°C | 25.6°C | 6.3°C | 124 mm | 84% | 0.2 m/s | 4.8 |
| 1990 | 21.3°C | 16.2°C | 11.1°C | 31.0°C | 4.9°C | 91 mm | 79% | 0.3 m/s | 5.1 |
| 1989 | 18.4°C | 14.0°C | 9.5°C | 25.0°C | 6.7°C | 100 mm | 83% | 0.2 m/s | 4.8 |
| 1988 | 19.7°C | 14.7°C | 9.7°C | 30.9°C | 5.0°C | 33 mm | 79% | 0.3 m/s | 4.9 |
| 1987 | 20.4°C | 15.2°C | 9.9°C | 30.6°C | 5.6°C | 20 mm | 74% | 0.3 m/s | 5.6 |
| 1986 | 23.4°C | 17.6°C | 11.8°C | 33.6°C | 8.3°C | 10 mm | 75% | 0.3 m/s | 5.9 |
| 1985 | 19.6°C | 14.2°C | 8.9°C | 25.5°C | 6.0°C | 30 mm | 72% | 0.3 m/s | 5.5 |
| 1984 | 19.0°C | 14.2°C | 9.3°C | 24.8°C | 5.6°C | 73 mm | 79% | 0.3 m/s | 5.3 |
| 1983 | 20.7°C | 15.6°C | 10.6°C | 32.0°C | 7.5°C | 56 mm | 78% | 0.3 m/s | — |
| 1982 | 20.1°C | 15.0°C | 10.0°C | 32.3°C | 6.1°C | 65 mm | 77% | 0.3 m/s | — |
| 1981 | 23.4°C | 17.7°C | 12.1°C | 34.7°C | 6.2°C | 24 mm | 74% | 0.3 m/s | — |
Actual recorded August data for each year, 1981–2025 — sourced from NASA POWER.
The average high in August is around 20.9°C with lows near 10.8°C (mean 15.9°C), based on 45 years of NASA POWER data.
August averages 53 mm of rainfall in Chilliwack, one of the drier months. The wettest on record was 163 mm in 2008.
The hottest August reached 36.2°C in 2025. The coldest dipped to 4.3°C in 1995.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average August temperatures have risen by about 1.6°C. Daytime highs moved from 20.6°C to 22°C and overnight lows from 10.2°C to 11.7°C over the same span.
August is one of the warmer months of the year in Chilliwack and one of the drier months, so plan for around 20.9°C daytime highs and 10.8°C at night.
Not quite — August is the 12th coolest month in Chilliwack, averaging 15.9°C.
For August in Chilliwack, pack light layers you can adjust through the day, with typical highs of 20.9°C and lows of 10.8°C. Bring an umbrella or light rain jacket too.
Relative humidity in August averages 78% — quite humid.
Average wind speed in August is 0.3 m/s. The windiest August on record averaged 0.3 m/s (1981).
The wettest August on record was 2008 with 163 mm. On average, August sees 53 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 Chilliwack 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.
