August is one of the warmer months of the year in Cape Breton, with average highs near 22.2°C and lows around 16°C (mean 19.1°C). It is one of the drier months, averaging 81 mm of rainfall and 80% relative humidity across the period.
August is one of the warmer months of the year in Cape Breton. Across 45 years of records, the warmest Augusts in Cape Breton were 2012 and 2018 — when the month averaged 21.3°C — while the coldest was 1982 at 16.9°C. Typical August days reach 22.2°C with nights near 16°C. The long-term trend is warming, about 0.4°C per decade.
August is one of the drier months in Cape Breton, averaging 81 mm of rainfall. The wettest August on record was 2008 with 182 mm, while the driest was 1993 at 28 mm.
Relative humidity in Cape Breton during August averages 80%. The most humid August was 2008 at 88%, and the least humid was 1995 at 71%.
August receives about 4.8 kWh/m²/day of solar energy in Cape Breton. The sunniest August was 2025 at 5.9 kWh/m²/day, and the cloudiest was 2008 at 4.
Average wind speed in Cape Breton during August is 5 m/s. The windiest August was 1989 at 6.3 m/s, while the calmest was 2010 at 4.2 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 18.3°C | 19.0°C | 19.0°C | 19.6°C | 19.9°C | +1.6°C |
| Avg High | 21.5°C | 22.3°C | 22.0°C | 22.5°C | 23.0°C | +1.5°C |
| Avg Low | 15.2°C | 15.6°C | 15.9°C | 16.7°C | 16.8°C | +1.6°C |
| Avg Rain | 95 mm | 58 mm | 95 mm | 84 mm | 67 mm | -28 mm |
August temperatures in Cape Breton have risen by about 1.9°C between 1981–1985 and 2021–2025.
August has ranged from a record low of 9.8°C (1986) to a record high of 32.3°C (1995).
Rainfall in August is one of the drier months, averaging 81 mm, with a wettest year of 182 mm.
Daytime highs and overnight lows have shifted differently — highs rose about 0.3°C per decade while lows rose 0.5°C per decade, narrowing the gap between day and night.
One of the best times to visit Cape Breton
August is one of the best times to visit Cape Breton. Expect days averaging 22.2°C and nights around 16°C (mean 19.1°C) — warmer than Cape Breton's yearly average — with higher rainfall (81 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 | 22.9°C | 19.5°C | 16.1°C | 27.1°C | 13.6°C | 53 mm | 73% | 5 m/s | 5.9 |
| 2024 | 23.9°C | 20.7°C | 17.6°C | 28.5°C | 13.7°C | 65 mm | 80% | 4.5 m/s | 4.9 |
| 2023 | 21.6°C | 18.9°C | 16.3°C | 24.7°C | 13.0°C | 111 mm | 81% | 4.6 m/s | 4.3 |
| 2022 | 23.3°C | 20.6°C | 17.8°C | 27.3°C | 15.6°C | 68 mm | 85% | 4.5 m/s | 4.6 |
| 2021 | 23.4°C | 20.0°C | 16.6°C | 28.4°C | 13.8°C | 34 mm | 81% | 4.8 m/s | 5.2 |
| 2020 | 22.8°C | 19.6°C | 16.4°C | 27.6°C | 12.8°C | 71 mm | 78% | 5.4 m/s | 5.1 |
| 2019 | 22.9°C | 19.9°C | 16.8°C | 26.3°C | 13.7°C | 76 mm | 80% | 4.6 m/s | 5.2 |
| 2018 | 24.3°C | 21.3°C | 18.2°C | 28.0°C | 16.3°C | 74 mm | 81% | 4.6 m/s | 5 |
| 2017 | 22.0°C | 19.2°C | 16.3°C | 26.5°C | 13.7°C | 84 mm | 80% | 4.8 m/s | 4.9 |
| 2016 | 21.8°C | 18.9°C | 16.1°C | 24.8°C | 12.8°C | 70 mm | 79% | 5.2 m/s | 4.7 |
| 2015 | 22.7°C | 19.8°C | 16.9°C | 26.6°C | 13.3°C | 118 mm | 87% | 5.1 m/s | 5.1 |
| 2014 | 22.0°C | 19.3°C | 16.7°C | 25.3°C | 12.5°C | 90 mm | 81% | 4.5 m/s | 4.7 |
| 2013 | 22.3°C | 19.1°C | 16.0°C | 24.9°C | 14.0°C | 94 mm | 81% | 5.5 m/s | 5.2 |
| 2012 🔥 | 24.3°C | 21.3°C | 18.3°C | 28.1°C | 14.5°C | 80 mm | 82% | 4.7 m/s | 4.6 |
| 2011 | 20.4°C | 17.7°C | 15.0°C | 23.7°C | 13.3°C | 78 mm | 87% | 5.4 m/s | 4.8 |
| 2010 | 22.2°C | 19.3°C | 16.5°C | 27.2°C | 13.8°C | 75 mm | 79% | 4.2 m/s | 5.1 |
| 2009 | 22.6°C | 19.6°C | 16.6°C | 28.0°C | 11.7°C | 151 mm | 82% | 5 m/s | 4.8 |
| 2008 🌧️ | 20.5°C | 18.1°C | 15.7°C | 23.0°C | 12.9°C | 182 mm | 88% | 5.6 m/s | 4 |
| 2007 | 21.2°C | 18.2°C | 15.1°C | 23.8°C | 10.9°C | 130 mm | 82% | 5.2 m/s | 4.9 |
| 2006 | 20.9°C | 17.9°C | 14.9°C | 24.8°C | 12.2°C | 59 mm | 78% | 5.2 m/s | 4.9 |
| 2005 | 22.3°C | 19.2°C | 16.1°C | 26.2°C | 13.2°C | 87 mm | 79% | 4.9 m/s | 4.8 |
| 2004 | 23.0°C | 19.8°C | 16.6°C | 26.5°C | 14.0°C | 60 mm | 81% | 5.1 m/s | 4.6 |
| 2003 | 21.5°C | 18.6°C | 15.7°C | 25.4°C | 11.7°C | 106 mm | 82% | 4.7 m/s | 4.5 |
| 2002 | 22.9°C | 19.4°C | 15.9°C | 28.9°C | 11.7°C | 87 mm | 79% | 5.2 m/s | 5.3 |
| 2001 | 23.2°C | 19.9°C | 16.6°C | 27.3°C | 12.9°C | 42 mm | 79% | 5 m/s | 4.9 |
| 2000 | 22.3°C | 19.3°C | 16.2°C | 25.7°C | 13.2°C | 49 mm | 81% | 4.8 m/s | 4.5 |
| 1999 | 22.6°C | 19.5°C | 16.3°C | 26.4°C | 13.4°C | 114 mm | 81% | 5.3 m/s | 4.7 |
| 1998 | 22.4°C | 19.0°C | 15.6°C | 27.1°C | 12.7°C | 73 mm | 80% | 4.9 m/s | 4.9 |
| 1997 | 20.7°C | 17.8°C | 14.8°C | 27.7°C | 12.6°C | 89 mm | 82% | 4.9 m/s | 4.2 |
| 1996 | 22.8°C | 19.4°C | 16.1°C | 29.9°C | 13.1°C | 47 mm | 78% | 4.4 m/s | 4.8 |
| 1995 | 22.2°C | 18.7°C | 15.2°C | 32.3°C | 11.6°C | 34 mm | 71% | 6.1 m/s | 4.7 |
| 1994 | 23.0°C | 19.7°C | 16.4°C | 27.3°C | 13.0°C | 52 mm | 76% | 5.1 m/s | 4.9 |
| 1993 | 21.2°C | 18.1°C | 14.9°C | 25.2°C | 12.4°C | 28 mm | 76% | 5 m/s | 5 |
| 1992 | 22.0°C | 18.6°C | 15.2°C | 28.1°C | 12.0°C | 41 mm | 78% | 5.4 m/s | 5 |
| 1991 | 22.6°C | 18.9°C | 15.2°C | 28.7°C | 12.8°C | 58 mm | 75% | 5.8 m/s | 4.5 |
| 1990 | 23.7°C | 20.0°C | 16.3°C | 27.9°C | 11.7°C | 46 mm | 75% | 5 m/s | 5.3 |
| 1989 | 22.9°C | 19.5°C | 16.0°C | 28.0°C | 11.0°C | 57 mm | 75% | 6.3 m/s | 4.7 |
| 1988 | 21.7°C | 18.7°C | 15.6°C | 27.8°C | 12.2°C | 70 mm | 81% | 4.8 m/s | 4.4 |
| 1987 | 22.5°C | 19.0°C | 15.4°C | 28.2°C | 12.1°C | 48 mm | 71% | 4.3 m/s | 5 |
| 1986 | 20.9°C | 17.7°C | 14.6°C | 25.9°C | 9.8°C | 67 mm | 80% | 4.7 m/s | 4.6 |
| 1985 | 21.2°C | 18.0°C | 14.9°C | 27.3°C | 11.9°C | 86 mm | 78% | 4.4 m/s | 4.8 |
| 1984 | 23.1°C | 20.1°C | 17.2°C | 27.0°C | 12.6°C | 165 mm | 83% | 4.9 m/s | 5.2 |
| 1983 | 20.3°C | 17.2°C | 14.2°C | 25.7°C | 11.3°C | 125 mm | 84% | 5.7 m/s | — |
| 1982 ❄️ | 19.8°C | 16.9°C | 14.0°C | 24.2°C | 10.4°C | 137 mm | 80% | 4.8 m/s | — |
| 1981 | 21.2°C | 18.0°C | 14.8°C | 24.9°C | 11.6°C | 99 mm | 82% | 5 m/s | — |
Actual recorded August data for each year, 1981–2025 — sourced from NASA POWER.
The average high in August is around 22.2°C with lows near 16°C (mean 19.1°C), based on 45 years of NASA POWER data.
August averages 81 mm of rainfall in Cape Breton, one of the drier months. The wettest on record was 182 mm in 2008.
The hottest August reached 32.3°C in 1995. The coldest dipped to 9.8°C in 1986.
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 21.1°C to 23°C and overnight lows from 15°C to 16.9°C over the same span.
August is one of the warmer months of the year in Cape Breton and one of the drier months, so plan for around 22.2°C daytime highs and 16°C at night.
Not quite — August is the 12th coolest month in Cape Breton, averaging 19.1°C.
For August in Cape Breton, pack light layers you can adjust through the day, with typical highs of 22.2°C and lows of 16°C. Bring an umbrella or light rain jacket too.
Relative humidity in August averages 80% — quite humid.
Average wind speed in August is 5 m/s. The windiest August on record averaged 6.3 m/s (1989).
The wettest August on record was 2008 with 182 mm. On average, August sees 81 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 Cape Breton 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.
