May is one of the warmer months of the year in Fort St. John, with average highs near 14.4°C and lows around 2.5°C (mean 8.5°C). It is about average for rainfall, averaging 55 mm of rainfall and 73% relative humidity across the period.
May is one of the warmer months of the year in Fort St. John. Across 45 years of records, the warmest May in Fort St. John was 2023 — when the month averaged 13.7°C — while the coldest was 1996 at 4.9°C. Typical May days reach 14.4°C with nights near 2.5°C. The long-term trend is warming, about 0.3°C per decade.
May is about average for rainfall in Fort St. John, averaging 55 mm of rainfall. The wettest May on record was 1984 with 119 mm, while the driest was 2014 at 19 mm.
Relative humidity in Fort St. John during May averages 73%. The most humid May was 1997 at 80%, and the least humid was 2024 at 67%.
May receives about 5.6 kWh/m²/day of solar energy in Fort St. John. The sunniest May was 2018 at 6.4 kWh/m²/day, and the cloudiest were 2004, 2020 and 2022 at 5.
Average wind speed in Fort St. John during May is 0.5 m/s. The windiest Mays were 2022, 2024 and 2025, among others at 0.6 m/s, while the calmest were 2019, 2021 and 2023, among others at 0.5 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 8.3°C | 8.6°C | 7.5°C | 9.0°C | 9.1°C | +0.8°C |
| Avg High | 14.2°C | 14.6°C | 13.4°C | 15.1°C | 15.0°C | +0.8°C |
| Avg Low | 2.3°C | 2.6°C | 1.7°C | 2.9°C | 3.3°C | +1°C |
| Avg Rain | 57 mm | 52 mm | 52 mm | 52 mm | 70 mm | +14 mm |
May temperatures in Fort St. John have risen by about 1.3°C between 1981–1985 and 2021–2025.
May has ranged from a record low of -9.4°C (1996) to a record high of 28.7°C (2023).
Rainfall in May is about average for rainfall, averaging 55 mm, with a wettest year of 119 mm.
A good time to visit Fort St. John
May is a good time to visit Fort St. John, with days averaging 14.4°C and nights around 2.5°C (mean 8.5°C, warmer than Fort St. John's yearly average) and moderate rainfall. August and July are marginally more temperate, but May still suits most travellers.
| Year | Avg High | Avg Temp | Avg Low | Hottest Day | Coldest Day | Rainfall | Humidity | Wind | Solar |
|---|---|---|---|---|---|---|---|---|---|
| 2025 | 15.9°C | 9.8°C | 3.7°C | 23.5°C | -2.5°C | 29 mm | 70% | 0.6 m/s | 5.7 |
| 2024 | 15.0°C | 9.0°C | 2.9°C | 20.8°C | -1.4°C | 37 mm | 67% | 0.6 m/s | 5.6 |
| 2023 🔥 | 20.1°C | 13.7°C | 7.2°C | 28.7°C | 2.1°C | 92 mm | 73% | 0.5 m/s | 5.8 |
| 2022 | 11.2°C | 6.2°C | 1.2°C | 17.7°C | -4.5°C | 110 mm | 78% | 0.6 m/s | 5 |
| 2021 | 14.0°C | 8.5°C | 2.9°C | 20.3°C | -2.0°C | 48 mm | 76% | 0.5 m/s | 5.4 |
| 2020 | 13.7°C | 7.7°C | 1.6°C | 19.6°C | -4.3°C | 106 mm | 78% | 0.6 m/s | 5 |
| 2019 | 15.3°C | 9.1°C | 2.8°C | 25.2°C | -6.0°C | 31 mm | 75% | 0.5 m/s | 5.4 |
| 2018 | 17.3°C | 10.8°C | 4.4°C | 25.3°C | -0.7°C | 25 mm | 74% | 0.6 m/s | 6.4 |
| 2017 | 15.5°C | 9.8°C | 4.1°C | 26.2°C | -1.7°C | 100 mm | 78% | 0.5 m/s | 5.7 |
| 2016 | 16.0°C | 9.6°C | 3.2°C | 24.3°C | -1.8°C | 52 mm | 69% | 0.6 m/s | 5.6 |
| 2015 | 16.0°C | 9.5°C | 3.0°C | 23.5°C | -4.2°C | 51 mm | 72% | 0.6 m/s | 6.1 |
| 2014 | 13.9°C | 7.9°C | 2.0°C | 19.9°C | -5.1°C | 19 mm | 73% | 0.5 m/s | 5.9 |
| 2013 | 15.9°C | 9.7°C | 3.5°C | 21.5°C | -6.9°C | 42 mm | 76% | 0.6 m/s | 5.7 |
| 2012 | 13.4°C | 7.6°C | 1.9°C | 22.9°C | -3.9°C | 72 mm | 71% | 0.6 m/s | 5.8 |
| 2011 | 14.9°C | 9.0°C | 3.1°C | 21.0°C | -1.4°C | 51 mm | 74% | 0.5 m/s | 5.4 |
| 2010 | 12.5°C | 6.9°C | 1.3°C | 20.5°C | -5.6°C | 72 mm | 69% | 0.6 m/s | 5.4 |
| 2009 | 12.3°C | 6.4°C | 0.6°C | 19.9°C | -5.0°C | 63 mm | 73% | 0.6 m/s | 5.2 |
| 2008 | 14.6°C | 8.5°C | 2.4°C | 21.6°C | -2.4°C | 37 mm | 76% | 0.5 m/s | 5.1 |
| 2007 | 13.4°C | 7.5°C | 1.7°C | 22.4°C | -3.2°C | 62 mm | 75% | 0.5 m/s | 5.3 |
| 2006 | 15.6°C | 9.5°C | 3.3°C | 26.2°C | -2.2°C | 59 mm | 68% | 0.6 m/s | 5.6 |
| 2005 | 16.2°C | 9.9°C | 3.7°C | 27.3°C | -5.1°C | 44 mm | 74% | 0.5 m/s | 5.9 |
| 2004 | 12.8°C | 6.9°C | 1.0°C | 23.6°C | -6.9°C | 33 mm | 70% | 0.5 m/s | 5 |
| 2003 | 12.5°C | 7.0°C | 1.4°C | 21.2°C | -6.1°C | 43 mm | 75% | 0.6 m/s | 5.6 |
| 2002 | 10.9°C | 5.5°C | 0.1°C | 20.3°C | -8.9°C | 50 mm | 73% | 0.6 m/s | 5.5 |
| 2001 | 13.8°C | 8.0°C | 2.3°C | 20.1°C | -2.9°C | 78 mm | 71% | 0.6 m/s | 5.5 |
| 2000 | 11.5°C | 6.1°C | 0.7°C | 18.5°C | -2.4°C | 56 mm | 72% | 0.6 m/s | 5.1 |
| 1999 | 12.2°C | 6.9°C | 1.7°C | 23.6°C | -3.4°C | 41 mm | 72% | 0.6 m/s | 5.7 |
| 1998 | 19.2°C | 12.6°C | 6.0°C | 23.1°C | 0.2°C | 64 mm | 72% | 0.5 m/s | 6.1 |
| 1997 | 13.5°C | 7.8°C | 2.1°C | 21.5°C | -3.0°C | 82 mm | 80% | 0.5 m/s | 5.6 |
| 1996 ❄️ | 10.2°C | 4.9°C | -0.3°C | 18.2°C | -9.4°C | 72 mm | 75% | 0.5 m/s | 5.6 |
| 1995 | 16.3°C | 9.5°C | 2.8°C | 25.0°C | -4.3°C | 31 mm | 71% | 0.5 m/s | 6 |
| 1994 | 14.7°C | 8.5°C | 2.3°C | 20.9°C | -2.0°C | 38 mm | 72% | 0.6 m/s | 5.9 |
| 1993 | 16.4°C | 10.3°C | 4.1°C | 23.4°C | -1.3°C | 52 mm | 73% | 0.5 m/s | 5.6 |
| 1992 | 13.3°C | 7.2°C | 1.2°C | 21.1°C | -4.1°C | 23 mm | 71% | 0.5 m/s | 6.1 |
| 1991 | 15.9°C | 9.8°C | 3.8°C | 23.0°C | -1.5°C | 44 mm | 70% | 0.6 m/s | 5.7 |
| 1990 | 14.8°C | 8.7°C | 2.7°C | 22.3°C | -2.2°C | 72 mm | 76% | 0.5 m/s | 5.1 |
| 1989 | 15.1°C | 8.9°C | 2.8°C | 22.5°C | -2.5°C | 48 mm | 72% | 0.5 m/s | 5.6 |
| 1988 | 15.3°C | 9.3°C | 3.2°C | 22.5°C | -4.3°C | 60 mm | 71% | 0.5 m/s | 5.3 |
| 1987 | 14.5°C | 8.3°C | 2.2°C | 22.0°C | -2.0°C | 47 mm | 71% | 0.6 m/s | 5.7 |
| 1986 | 13.4°C | 7.5°C | 1.5°C | 23.0°C | -6.3°C | 48 mm | 76% | 0.5 m/s | 5.2 |
| 1985 | 15.2°C | 8.8°C | 2.4°C | 23.8°C | -3.7°C | 25 mm | 70% | 0.5 m/s | 6 |
| 1984 🌧️ | 11.7°C | 6.5°C | 1.2°C | 16.8°C | -2.3°C | 119 mm | 75% | 0.5 m/s | 5.3 |
| 1983 | 14.3°C | 8.4°C | 2.4°C | 27.6°C | -4.0°C | 30 mm | 73% | 0.6 m/s | — |
| 1982 | 12.5°C | 6.7°C | 0.9°C | 21.6°C | -3.5°C | 45 mm | 76% | 0.6 m/s | — |
| 1981 | 15.9°C | 10.0°C | 4.1°C | 21.1°C | -2.8°C | 88 mm | 76% | 0.5 m/s | — |
Actual recorded May data for each year, 1981–2025 — sourced from NASA POWER.
The average high in May is around 14.4°C with lows near 2.5°C (mean 8.5°C), based on 45 years of NASA POWER data.
May averages 55 mm of rainfall in Fort St. John, about average for rainfall. The wettest on record was 119 mm in 1984.
The hottest May reached 28.7°C in 2023. The coldest dipped to -9.4°C in 1996.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average May temperatures have risen by about 1.3°C. Daytime highs moved from 13.9°C to 15.2°C and overnight lows from 2.2°C to 3.6°C over the same span.
May is one of the warmer months of the year in Fort St. John and about average for rainfall, so plan for around 14.4°C daytime highs and 2.5°C at night.
Not quite — May is the 8th coolest month in Fort St. John, averaging 8.5°C.
For May in Fort St. John, pack warm layers and a jacket for chilly mornings, with typical highs of 14.4°C and lows of 2.5°C. Bring an umbrella or light rain jacket too.
Relative humidity in May averages 73% — moderately humid.
Average wind speed in May is 0.5 m/s. The windiest May on record averaged 0.6 m/s (1982).
The wettest May on record was 1984 with 119 mm. On average, May 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 May, 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 May specifically, along with year-by-year records and how the month has changed over the decades.
