August is one of the warmer months of the year in Fredericton, with average highs near 23°C and lows around 13°C (mean 18°C). It is about average for rainfall, averaging 94 mm of rainfall and 84% relative humidity across the period.
August is one of the warmer months of the year in Fredericton. Across 45 years of records, the warmest Augusts in Fredericton were 2015 and 2021 — when the month averaged 20°C — while the coldest was 1982 at 15.3°C. Typical August days reach 23°C with nights near 13°C. The long-term trend is warming, about 0.3°C per decade.
August is about average for rainfall in Fredericton, averaging 94 mm of rainfall. The wettest August on record was 1991 with 203 mm, while the driest was 2025 at 31 mm.
Relative humidity in Fredericton during August averages 84%. The most humid Augusts were 2011 and 2023 at 87%, and the least humid was 2025 at 80%.
August receives about 5 kWh/m²/day of solar energy in Fredericton. The sunniest August was 2025 at 5.7 kWh/m²/day, and the cloudiest were 1988 and 2008 at 4.2.
Average wind speed in Fredericton during August is 0.1 m/s. The windiest Augusts were 2013, 2014 and 2022, among others at 0.2 m/s, while the calmest were 2023, 2024 and 2025, among others at 0.1 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 17.2°C | 17.9°C | 17.9°C | 18.5°C | 18.7°C | +1.5°C |
| Avg High | 22.2°C | 23.0°C | 22.9°C | 23.4°C | 23.8°C | +1.6°C |
| Avg Low | 12.2°C | 12.7°C | 12.9°C | 13.5°C | 13.6°C | +1.4°C |
| Avg Rain | 115 mm | 86 mm | 88 mm | 100 mm | 79 mm | -36 mm |
August temperatures in Fredericton have risen by about 1.5°C between 1981–1985 and 2021–2025.
August has ranged from a record low of 4°C (1982) to a record high of 33.2°C (2025).
Rainfall in August is about average for rainfall, averaging 94 mm, with a wettest year of 203 mm.
One of the best times to visit Fredericton
August is one of the best times to visit Fredericton. Expect days averaging 23°C and nights around 13°C (mean 18°C) — warmer than Fredericton's yearly average — with higher rainfall (94 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 | 24.2°C | 18.1°C | 12.0°C | 33.2°C | 6.2°C | 31 mm | 80% | 0.1 m/s | 5.7 |
| 2024 | 23.7°C | 18.9°C | 14.0°C | 29.8°C | 7.8°C | 76 mm | 86% | 0.1 m/s | 4.9 |
| 2023 | 22.0°C | 17.4°C | 12.9°C | 25.3°C | 7.8°C | 136 mm | 87% | 0.1 m/s | 4.5 |
| 2022 | 24.0°C | 19.2°C | 14.3°C | 30.8°C | 9.6°C | 114 mm | 85% | 0.2 m/s | 4.5 |
| 2021 | 25.4°C | 20.0°C | 14.6°C | 30.7°C | 8.6°C | 68 mm | 84% | 0.1 m/s | 5.1 |
| 2020 | 23.4°C | 18.4°C | 13.5°C | 29.0°C | 7.7°C | 48 mm | 83% | 0.1 m/s | 5.3 |
| 2019 | 23.0°C | 18.0°C | 12.9°C | 26.5°C | 7.3°C | 87 mm | 85% | 0.1 m/s | 5.1 |
| 2018 | 24.6°C | 19.6°C | 14.7°C | 29.6°C | 9.2°C | 98 mm | 86% | 0.1 m/s | 5 |
| 2017 | 22.5°C | 17.4°C | 12.3°C | 26.8°C | 8.4°C | 50 mm | 83% | 0.1 m/s | 5.1 |
| 2016 | 23.4°C | 18.4°C | 13.5°C | 27.2°C | 9.8°C | 147 mm | 86% | 0.1 m/s | 4.9 |
| 2015 🔥 | 24.7°C | 20.0°C | 15.3°C | 29.7°C | 11.2°C | 94 mm | 86% | 0.1 m/s | 5.1 |
| 2014 | 22.9°C | 17.9°C | 12.9°C | 28.1°C | 8.5°C | 100 mm | 84% | 0.2 m/s | 5 |
| 2013 | 22.4°C | 17.4°C | 12.4°C | 27.3°C | 7.0°C | 107 mm | 85% | 0.2 m/s | 5.1 |
| 2012 | 24.2°C | 19.5°C | 14.7°C | 31.6°C | 9.9°C | 97 mm | 86% | 0.1 m/s | 4.9 |
| 2011 | 23.0°C | 18.4°C | 13.7°C | 26.8°C | 9.4°C | 172 mm | 87% | 0.1 m/s | 4.6 |
| 2010 | 23.5°C | 18.2°C | 13.0°C | 29.9°C | 8.8°C | 45 mm | 83% | 0.1 m/s | 5.2 |
| 2009 | 23.9°C | 19.0°C | 14.1°C | 29.9°C | 5.8°C | 105 mm | 84% | 0.1 m/s | 5.2 |
| 2008 | 21.9°C | 17.2°C | 12.5°C | 27.7°C | 9.6°C | 100 mm | 87% | 0.1 m/s | 4.2 |
| 2007 | 22.5°C | 17.2°C | 11.9°C | 28.5°C | 6.7°C | 79 mm | 84% | 0.1 m/s | 5.3 |
| 2006 | 20.8°C | 16.1°C | 11.3°C | 26.8°C | 5.9°C | 80 mm | 85% | 0.1 m/s | 4.9 |
| 2005 | 23.0°C | 17.9°C | 12.9°C | 28.6°C | 6.6°C | 118 mm | 85% | 0.1 m/s | 5 |
| 2004 | 22.5°C | 17.8°C | 13.2°C | 27.5°C | 6.9°C | 137 mm | 86% | 0.1 m/s | 4.7 |
| 2003 | 23.2°C | 18.5°C | 13.9°C | 27.3°C | 6.3°C | 107 mm | 85% | 0.1 m/s | 4.4 |
| 2002 | 24.0°C | 18.7°C | 13.4°C | 31.5°C | 6.3°C | 37 mm | 83% | 0.1 m/s | 5.4 |
| 2001 | 24.4°C | 18.7°C | 13.1°C | 29.6°C | 5.3°C | 37 mm | 81% | 0.1 m/s | 5.2 |
| 2000 | 22.4°C | 17.5°C | 12.6°C | 25.9°C | 8.1°C | 77 mm | 86% | 0.1 m/s | 4.6 |
| 1999 | 22.7°C | 17.6°C | 12.5°C | 28.1°C | 7.8°C | 64 mm | 82% | 0.1 m/s | 4.9 |
| 1998 | 23.4°C | 18.1°C | 12.9°C | 28.4°C | 7.2°C | 77 mm | 82% | 0.2 m/s | 5.3 |
| 1997 | 21.8°C | 16.9°C | 11.9°C | 27.3°C | 6.3°C | 76 mm | 84% | 0.2 m/s | 4.8 |
| 1996 | 23.4°C | 18.0°C | 12.6°C | 30.0°C | 8.4°C | 49 mm | 84% | 0.1 m/s | 5.2 |
| 1995 | 22.7°C | 17.3°C | 12.0°C | 29.8°C | 6.9°C | 63 mm | 82% | 0.1 m/s | 5.4 |
| 1994 | 22.3°C | 17.3°C | 12.2°C | 27.2°C | 6.5°C | 52 mm | 83% | 0.2 m/s | 5.2 |
| 1993 | 23.8°C | 18.4°C | 13.0°C | 29.8°C | 7.7°C | 54 mm | 83% | 0.1 m/s | 5.6 |
| 1992 | 22.7°C | 17.6°C | 12.6°C | 28.1°C | 8.3°C | 92 mm | 85% | 0.1 m/s | 4.9 |
| 1991 🌧️ | 23.1°C | 18.3°C | 13.5°C | 28.6°C | 8.5°C | 203 mm | 86% | 0.1 m/s | 4.7 |
| 1990 | 24.2°C | 19.1°C | 14.0°C | 29.3°C | 6.1°C | 125 mm | 84% | 0.1 m/s | 5.3 |
| 1989 | 22.3°C | 17.4°C | 12.6°C | 26.6°C | 5.8°C | 184 mm | 85% | 0.1 m/s | 4.6 |
| 1988 | 23.1°C | 18.4°C | 13.6°C | 29.9°C | 5.3°C | 143 mm | 85% | 0.1 m/s | 4.2 |
| 1987 | 21.9°C | 16.6°C | 11.3°C | 30.9°C | 5.5°C | 48 mm | 80% | 0.2 m/s | 5.1 |
| 1986 | 21.0°C | 16.3°C | 11.6°C | 25.9°C | 4.2°C | 137 mm | 85% | 0.1 m/s | 4.4 |
| 1985 | 21.6°C | 16.5°C | 11.4°C | 28.1°C | 5.8°C | 86 mm | 84% | 0.1 m/s | 5 |
| 1984 | 24.3°C | 19.3°C | 14.3°C | 33.1°C | 8.1°C | 89 mm | 86% | 0.1 m/s | 5 |
| 1983 | 22.8°C | 17.8°C | 12.8°C | 26.6°C | 7.0°C | 81 mm | 84% | 0.1 m/s | — |
| 1982 ❄️ | 20.3°C | 15.3°C | 10.4°C | 26.5°C | 4.0°C | 137 mm | 84% | 0.1 m/s | — |
| 1981 | 22.4°C | 17.3°C | 12.2°C | 27.0°C | 5.9°C | 134 mm | 85% | 0.1 m/s | — |
Actual recorded August data for each year, 1981–2025 — sourced from NASA POWER.
The average high in August is around 23°C with lows near 13°C (mean 18°C), based on 45 years of NASA POWER data.
August averages 94 mm of rainfall in Fredericton, about average for rainfall. The wettest on record was 203 mm in 1991.
The hottest August reached 33.2°C in 2025. The coldest dipped to 4°C in 1982.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average August temperatures have risen by about 1.5°C. Daytime highs moved from 22.3°C to 23.9°C and overnight lows from 12.2°C to 13.6°C over the same span.
August is one of the warmer months of the year in Fredericton and about average for rainfall, so plan for around 23°C daytime highs and 13°C at night.
Not quite — August is the 11th coolest month in Fredericton, averaging 18°C.
For August in Fredericton, pack light layers you can adjust through the day, with typical highs of 23°C and lows of 13°C. Bring an umbrella or light rain jacket too.
Relative humidity in August averages 84% — quite humid.
Average wind speed in August is 0.1 m/s. The windiest August on record averaged 0.2 m/s (1987).
The wettest August on record was 1991 with 203 mm. On average, August sees 94 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 Fredericton 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.
