August is one of the warmer months of the year in Fort St. John, with average highs near 21.1°C and lows around 9.1°C (mean 15.1°C). It is about average for rainfall, averaging 55 mm of rainfall and 69% relative humidity across the period.
August is one of the warmer months of the year in Fort St. John. Across 45 years of records, the warmest August in Fort St. John was 2022 — when the month averaged 18.2°C — while the coldest was 1982 at 11.4°C. Typical August days reach 21.1°C with nights near 9.1°C. The long-term trend is warming, about 0.3°C per decade.
August is about average for rainfall in Fort St. John, averaging 55 mm of rainfall. The wettest August on record was 2007 with 149 mm, while the driest was 2006 at 9 mm.
Relative humidity in Fort St. John during August averages 69%. The most humid August was 2007 at 82%, and the least humid was 2006 at 55%.
August receives about 4.8 kWh/m²/day of solar energy in Fort St. John. The sunniest Augusts were 1986 and 2022 at 5.4 kWh/m²/day, and the cloudiest was 2007 at 4.
Average wind speed in Fort St. John during August is 0.5 m/s. The windiest August was 2021 at 0.6 m/s, while the calmest were 2016, 2023 and 2024, among others at 0.4 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 14.5°C | 15.4°C | 14.6°C | 15.3°C | 16.3°C | +1.8°C |
| Avg High | 20.6°C | 21.5°C | 20.6°C | 21.1°C | 22.3°C | +1.7°C |
| Avg Low | 8.4°C | 9.2°C | 8.6°C | 9.5°C | 10.3°C | +1.9°C |
| Avg Rain | 64 mm | 51 mm | 56 mm | 53 mm | 49 mm | -14 mm |
August temperatures in Fort St. John have risen by about 2.4°C between 1981–1985 and 2021–2025.
August has ranged from a record low of -2.6°C (1992) to a record high of 33.3°C (2008).
Rainfall in August is about average for rainfall, averaging 55 mm, with a wettest year of 149 mm.
Daytime highs and overnight lows have shifted differently — highs rose about 0.2°C per decade while lows rose 0.4°C per decade, narrowing the gap between day and night.
One of the best times to visit Fort St. John
August is one of the best times to visit Fort St. John. Expect days averaging 21.1°C and nights around 9.1°C (mean 15.1°C) — warmer than Fort St. John's yearly average — with moderate rainfall (55 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 | 23.2°C | 16.9°C | 10.5°C | 31.8°C | 3.9°C | 54 mm | 69% | 0.5 m/s | 5.1 |
| 2024 | 22.7°C | 16.4°C | 10.0°C | 31.2°C | 6.2°C | 42 mm | 66% | 0.4 m/s | 4.6 |
| 2023 | 23.6°C | 17.2°C | 10.9°C | 30.4°C | 6.5°C | 44 mm | 67% | 0.4 m/s | 4.8 |
| 2022 🔥 | 24.5°C | 18.2°C | 11.9°C | 31.4°C | 8.1°C | 43 mm | 69% | 0.5 m/s | 5.4 |
| 2021 | 21.2°C | 15.7°C | 10.1°C | 30.1°C | 3.3°C | 58 mm | 67% | 0.6 m/s | 4.3 |
| 2020 | 18.6°C | 13.5°C | 8.3°C | 27.1°C | 1.9°C | 56 mm | 77% | 0.5 m/s | 4.7 |
| 2019 | 17.5°C | 12.8°C | 8.1°C | 25.9°C | 3.5°C | 122 mm | 79% | 0.5 m/s | 4.2 |
| 2018 | 20.4°C | 15.0°C | 9.5°C | 26.0°C | 5.1°C | 47 mm | 74% | 0.5 m/s | 4.8 |
| 2017 | 22.6°C | 16.4°C | 10.2°C | 29.4°C | 6.4°C | 32 mm | 67% | 0.5 m/s | 5.2 |
| 2016 | 21.2°C | 15.9°C | 10.6°C | 26.4°C | 3.4°C | 124 mm | 74% | 0.4 m/s | 4.5 |
| 2015 | 20.7°C | 14.8°C | 9.0°C | 24.4°C | 3.2°C | 49 mm | 65% | 0.5 m/s | 4.7 |
| 2014 | 23.6°C | 16.8°C | 10.0°C | 32.1°C | 4.0°C | 10 mm | 61% | 0.5 m/s | 5.2 |
| 2013 | 21.7°C | 16.2°C | 10.7°C | 26.9°C | 5.9°C | 49 mm | 74% | 0.4 m/s | 4.9 |
| 2012 | 23.6°C | 16.7°C | 9.9°C | 31.8°C | 3.3°C | 28 mm | 62% | 0.5 m/s | 5.2 |
| 2011 | 18.6°C | 13.3°C | 8.0°C | 22.6°C | 4.4°C | 30 mm | 76% | 0.5 m/s | 5.3 |
| 2010 | 21.0°C | 15.0°C | 8.9°C | 29.0°C | 0.7°C | 34 mm | 62% | 0.5 m/s | 4.1 |
| 2009 | 22.2°C | 15.5°C | 8.9°C | 29.9°C | 3.1°C | 47 mm | 63% | 0.5 m/s | 5 |
| 2008 | 22.3°C | 16.2°C | 10.0°C | 33.3°C | 3.7°C | 62 mm | 65% | 0.5 m/s | 4.8 |
| 2007 🌧️ | 16.8°C | 12.2°C | 7.6°C | 25.4°C | 2.9°C | 149 mm | 82% | 0.5 m/s | 4 |
| 2006 | 22.0°C | 15.2°C | 8.3°C | 27.9°C | 3.3°C | 9 mm | 55% | 0.5 m/s | 5.2 |
| 2005 | 19.7°C | 13.6°C | 7.5°C | 27.6°C | 2.2°C | 38 mm | 69% | 0.5 m/s | 4.6 |
| 2004 | 21.4°C | 15.2°C | 9.0°C | 30.4°C | 3.0°C | 63 mm | 69% | 0.4 m/s | 4.4 |
| 2003 | 20.9°C | 14.6°C | 8.4°C | 29.5°C | 1.2°C | 49 mm | 66% | 0.5 m/s | 4.9 |
| 2002 | 19.9°C | 14.1°C | 8.2°C | 26.9°C | 1.7°C | 28 mm | 68% | 0.5 m/s | 4.5 |
| 2001 | 22.2°C | 15.8°C | 9.4°C | 30.7°C | 5.7°C | 28 mm | 69% | 0.5 m/s | 5 |
| 2000 | 18.5°C | 13.4°C | 8.3°C | 29.9°C | 1.0°C | 88 mm | 74% | 0.5 m/s | 4.2 |
| 1999 | 23.0°C | 16.3°C | 9.6°C | 31.6°C | 4.3°C | 34 mm | 61% | 0.5 m/s | 5.2 |
| 1998 | 23.6°C | 17.0°C | 10.3°C | 29.9°C | 5.8°C | 16 mm | 58% | 0.5 m/s | 5.3 |
| 1997 | 20.2°C | 14.9°C | 9.6°C | 29.5°C | 4.2°C | 72 mm | 78% | 0.5 m/s | 5.1 |
| 1996 | 19.7°C | 14.1°C | 8.5°C | 30.7°C | 5.3°C | 81 mm | 76% | 0.5 m/s | 5 |
| 1995 | 17.9°C | 12.3°C | 6.7°C | 22.5°C | 3.8°C | 49 mm | 71% | 0.5 m/s | 4.7 |
| 1994 | 23.5°C | 17.0°C | 10.5°C | 29.4°C | 6.3°C | 46 mm | 64% | 0.5 m/s | 5.2 |
| 1993 | 19.4°C | 14.0°C | 8.6°C | 26.9°C | 2.6°C | 79 mm | 78% | 0.5 m/s | 4.8 |
| 1992 | 22.2°C | 15.1°C | 8.1°C | 33.1°C | -2.6°C | 30 mm | 58% | 0.5 m/s | 4.8 |
| 1991 | 23.8°C | 17.2°C | 10.6°C | 32.0°C | 4.2°C | 60 mm | 63% | 0.5 m/s | 4.8 |
| 1990 | 22.2°C | 16.0°C | 9.8°C | 32.2°C | 1.2°C | 39 mm | 64% | 0.5 m/s | 4.9 |
| 1989 | 21.9°C | 16.4°C | 10.8°C | 29.3°C | 2.0°C | 91 mm | 74% | 0.4 m/s | 4.7 |
| 1988 | 21.2°C | 15.1°C | 8.9°C | 29.6°C | 4.1°C | 45 mm | 68% | 0.5 m/s | 4.8 |
| 1987 | 16.8°C | 12.0°C | 7.1°C | 22.6°C | 4.1°C | 140 mm | 80% | 0.5 m/s | 4.7 |
| 1986 | 21.8°C | 14.7°C | 7.6°C | 29.3°C | 2.5°C | 13 mm | 60% | 0.5 m/s | 5.4 |
| 1985 | 20.5°C | 13.8°C | 7.1°C | 29.7°C | 1.3°C | 54 mm | 63% | 0.5 m/s | 4.8 |
| 1984 | 21.0°C | 15.0°C | 9.0°C | 29.6°C | 0.7°C | 65 mm | 66% | 0.5 m/s | 4.7 |
| 1983 | 20.6°C | 14.4°C | 8.3°C | 28.9°C | 4.6°C | 30 mm | 72% | 0.5 m/s | — |
| 1982 ❄️ | 16.2°C | 11.4°C | 6.6°C | 25.1°C | 0.7°C | 106 mm | 80% | 0.5 m/s | — |
| 1981 | 25.2°C | 17.9°C | 10.5°C | 32.0°C | 3.1°C | 33 mm | 60% | 0.5 m/s | — |
Actual recorded August data for each year, 1981–2025 — sourced from NASA POWER.
The average high in August is around 21.1°C with lows near 9.1°C (mean 15.1°C), based on 45 years of NASA POWER data.
August averages 55 mm of rainfall in Fort St. John, about average for rainfall. The wettest on record was 149 mm in 2007.
The hottest August reached 33.3°C in 2008. The coldest dipped to -2.6°C in 1992.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average August temperatures have risen by about 2.4°C. Daytime highs moved from 20.7°C to 23°C and overnight lows from 8.3°C to 10.7°C over the same span.
August is one of the warmer months of the year in Fort St. John and about average for rainfall, so plan for around 21.1°C daytime highs and 9.1°C at night.
Not quite — August is the 11th coolest month in Fort St. John, averaging 15.1°C.
For August in Fort St. John, pack light layers you can adjust through the day, with typical highs of 21.1°C and lows of 9.1°C. Bring an umbrella or light rain jacket too.
Relative humidity in August averages 69% — moderately humid.
Average wind speed in August is 0.5 m/s. The windiest August on record averaged 0.6 m/s (2021).
The wettest August on record was 2007 with 149 mm. On average, August sees 55 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 Fort St. John 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.
