August is one of the warmer months of the year in Charlottetown, with average highs near 22.3°C and lows around 16.3°C (mean 19.3°C). It is about average for rainfall, averaging 79 mm of rainfall and 79% relative humidity across the period.
August is one of the warmer months of the year in Charlottetown. Across 45 years of records, the warmest Augusts in Charlottetown were 2012 and 2018 — when the month averaged 21.5°C — while the coldest was 1982 at 17.3°C. Typical August days reach 22.3°C with nights near 16.3°C. The long-term trend is warming, about 0.4°C per decade.
August is about average for rainfall in Charlottetown, averaging 79 mm of rainfall. The wettest August on record was 2008 with 190 mm, while the driest was 1993 at 23 mm.
Relative humidity in Charlottetown during August averages 79%. The most humid August was 2008 at 87%, and the least humid was 2025 at 70%.
August receives about 5 kWh/m²/day of solar energy in Charlottetown. The sunniest August was 2025 at 5.9 kWh/m²/day, and the cloudiest was 1988 at 4.1.
Average wind speed in Charlottetown during August is 2.8 m/s. The windiest August was 1989 at 3.4 m/s, while the calmest were 1993 and 1996 at 2.3 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 18.6°C | 19.1°C | 18.9°C | 19.9°C | 20.3°C | +1.7°C |
| Avg High | 21.6°C | 22.4°C | 21.8°C | 22.8°C | 23.3°C | +1.7°C |
| Avg Low | 15.6°C | 15.9°C | 16.0°C | 17.1°C | 17.2°C | +1.6°C |
| Avg Rain | 80 mm | 63 mm | 94 mm | 84 mm | 70 mm | -10 mm |
August temperatures in Charlottetown have risen by about 1.7°C between 1981–1985 and 2021–2025.
August has ranged from a record low of 10.1°C (1986) to a record high of 32°C (2025).
Rainfall in August is about average for rainfall, averaging 79 mm, with a wettest year of 190 mm.
One of the best times to visit Charlottetown
August is one of the best times to visit Charlottetown. Expect days averaging 22.3°C and nights around 16.3°C (mean 19.3°C) — warmer than Charlottetown's yearly average — with moderate rainfall (79 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 | 23.6°C | 20.0°C | 16.5°C | 32.0°C | 14.2°C | 38 mm | 70% | 2.8 m/s | 5.9 |
| 2024 | 23.1°C | 20.3°C | 17.4°C | 26.3°C | 13.0°C | 67 mm | 81% | 2.6 m/s | 5.1 |
| 2023 | 21.5°C | 18.8°C | 16.1°C | 24.0°C | 13.3°C | 127 mm | 83% | 2.7 m/s | 4.4 |
| 2022 | 23.9°C | 21.1°C | 18.2°C | 28.6°C | 16.5°C | 80 mm | 81% | 2.6 m/s | 4.7 |
| 2021 | 24.3°C | 21.0°C | 17.7°C | 29.8°C | 14.3°C | 46 mm | 78% | 2.6 m/s | 5.3 |
| 2020 | 23.6°C | 20.4°C | 17.1°C | 27.9°C | 12.7°C | 62 mm | 75% | 3.2 m/s | 5.4 |
| 2019 | 23.0°C | 19.9°C | 16.9°C | 25.9°C | 13.8°C | 72 mm | 79% | 2.8 m/s | 5.3 |
| 2018 | 24.6°C | 21.5°C | 18.4°C | 29.6°C | 16.0°C | 93 mm | 79% | 2.7 m/s | 4.9 |
| 2017 | 22.2°C | 19.3°C | 16.4°C | 25.6°C | 14.1°C | 90 mm | 80% | 2.7 m/s | 5.1 |
| 2016 | 22.1°C | 19.3°C | 16.6°C | 24.9°C | 15.0°C | 102 mm | 80% | 3 m/s | 5 |
| 2015 | 23.5°C | 20.7°C | 17.9°C | 27.1°C | 15.3°C | 91 mm | 85% | 2.8 m/s | 5.3 |
| 2014 | 21.8°C | 19.2°C | 16.7°C | 25.4°C | 11.9°C | 75 mm | 80% | 2.9 m/s | 4.7 |
| 2013 | 22.3°C | 19.2°C | 16.1°C | 25.5°C | 13.9°C | 59 mm | 79% | 3 m/s | 5.3 |
| 2012 🔥 | 24.6°C | 21.5°C | 18.4°C | 27.9°C | 15.4°C | 72 mm | 79% | 2.5 m/s | 4.8 |
| 2011 | 21.7°C | 19.0°C | 16.3°C | 24.3°C | 14.4°C | 94 mm | 85% | 2.8 m/s | 4.8 |
| 2010 | 22.4°C | 19.6°C | 16.8°C | 26.1°C | 13.9°C | 89 mm | 79% | 2.5 m/s | 5.4 |
| 2009 | 22.3°C | 19.6°C | 16.8°C | 26.7°C | 12.8°C | 168 mm | 83% | 2.7 m/s | 4.9 |
| 2008 🌧️ | 20.7°C | 18.3°C | 15.8°C | 23.8°C | 13.5°C | 190 mm | 87% | 3 m/s | 4.2 |
| 2007 | 21.0°C | 18.2°C | 15.5°C | 26.0°C | 12.1°C | 157 mm | 81% | 2.7 m/s | 5.1 |
| 2006 | 20.1°C | 17.5°C | 14.8°C | 23.8°C | 12.2°C | 65 mm | 81% | 3.1 m/s | 5.1 |
| 2005 | 22.3°C | 19.2°C | 16.0°C | 25.8°C | 13.3°C | 49 mm | 80% | 2.6 m/s | 4.7 |
| 2004 | 22.6°C | 19.6°C | 16.6°C | 26.3°C | 13.4°C | 72 mm | 79% | 2.7 m/s | 4.8 |
| 2003 | 21.3°C | 18.6°C | 15.8°C | 24.4°C | 10.9°C | 91 mm | 84% | 2.6 m/s | 4.5 |
| 2002 | 23.0°C | 19.7°C | 16.4°C | 30.0°C | 12.9°C | 48 mm | 76% | 2.7 m/s | 5.2 |
| 2001 | 23.0°C | 19.8°C | 16.6°C | 27.8°C | 12.3°C | 27 mm | 77% | 2.7 m/s | 5.2 |
| 2000 | 21.9°C | 19.0°C | 16.0°C | 24.8°C | 13.9°C | 69 mm | 80% | 2.6 m/s | 4.7 |
| 1999 | 22.1°C | 19.2°C | 16.3°C | 27.2°C | 14.1°C | 119 mm | 77% | 2.9 m/s | 4.8 |
| 1998 | 22.6°C | 19.3°C | 16.0°C | 27.8°C | 12.7°C | 67 mm | 76% | 2.8 m/s | 5.1 |
| 1997 | 20.9°C | 18.1°C | 15.4°C | 25.9°C | 12.8°C | 48 mm | 78% | 2.6 m/s | 4.7 |
| 1996 | 22.4°C | 19.1°C | 15.9°C | 29.4°C | 13.9°C | 30 mm | 78% | 2.3 m/s | 5.2 |
| 1995 | 22.0°C | 18.7°C | 15.4°C | 30.7°C | 12.1°C | 25 mm | 73% | 3.2 m/s | 5 |
| 1994 | 22.6°C | 19.3°C | 16.0°C | 27.0°C | 13.0°C | 35 mm | 73% | 3 m/s | 5.2 |
| 1993 | 22.6°C | 19.2°C | 15.8°C | 26.5°C | 12.9°C | 23 mm | 76% | 2.3 m/s | 5.2 |
| 1992 | 22.1°C | 18.8°C | 15.4°C | 25.3°C | 13.5°C | 65 mm | 79% | 2.7 m/s | 5 |
| 1991 | 22.2°C | 19.0°C | 15.9°C | 25.8°C | 12.7°C | 113 mm | 78% | 3.2 m/s | 4.5 |
| 1990 | 24.0°C | 20.6°C | 17.3°C | 28.7°C | 13.5°C | 101 mm | 77% | 2.6 m/s | 5.1 |
| 1989 | 22.4°C | 19.3°C | 16.1°C | 26.1°C | 10.5°C | 46 mm | 76% | 3.4 m/s | 4.4 |
| 1988 | 22.3°C | 19.3°C | 16.2°C | 26.7°C | 11.7°C | 92 mm | 80% | 2.6 m/s | 4.1 |
| 1987 | 22.0°C | 18.7°C | 15.4°C | 29.1°C | 11.4°C | 53 mm | 72% | 2.5 m/s | 5.1 |
| 1986 | 20.4°C | 17.5°C | 14.6°C | 23.9°C | 10.1°C | 79 mm | 81% | 2.7 m/s | 4.5 |
| 1985 | 21.2°C | 18.2°C | 15.3°C | 25.7°C | 12.3°C | 97 mm | 80% | 2.6 m/s | 4.9 |
| 1984 | 23.2°C | 20.2°C | 17.3°C | 26.7°C | 13.4°C | 132 mm | 83% | 2.4 m/s | 5.3 |
| 1983 | 20.9°C | 18.1°C | 15.2°C | 24.7°C | 12.0°C | 87 mm | 83% | 3 m/s | — |
| 1982 ❄️ | 20.1°C | 17.3°C | 14.6°C | 24.4°C | 10.4°C | 88 mm | 79% | 3.1 m/s | — |
| 1981 | 21.9°C | 18.7°C | 15.5°C | 25.2°C | 12.3°C | 45 mm | 79% | 3 m/s | — |
Actual recorded August data for each year, 1981–2025 — sourced from NASA POWER.
The average high in August is around 22.3°C with lows near 16.3°C (mean 19.3°C), based on 45 years of NASA POWER data.
August averages 79 mm of rainfall in Charlottetown, about average for rainfall. The wettest on record was 190 mm in 2008.
The hottest August reached 32°C in 2025. The coldest dipped to 10.1°C in 1986.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average August temperatures have risen by about 1.7°C. Daytime highs moved from 21.5°C to 23.3°C and overnight lows from 15.6°C to 17.2°C over the same span.
August is one of the warmer months of the year in Charlottetown and about average for rainfall, so plan for around 22.3°C daytime highs and 16.3°C at night.
Not quite — August is the 12th coolest month in Charlottetown, averaging 19.3°C.
For August in Charlottetown, pack light layers you can adjust through the day, with typical highs of 22.3°C and lows of 16.3°C. Bring an umbrella or light rain jacket too.
Relative humidity in August averages 79% — quite humid.
Average wind speed in August is 2.8 m/s. The windiest August on record averaged 3.4 m/s (1989).
The wettest August on record was 2008 with 190 mm. On average, August sees 79 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 Charlottetown 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.
