October is one of the warmer months of the year in Saint-Jean-sur-Richelieu, with average highs near 13.5°C and lows around 3.6°C (mean 8.6°C). It is a relatively wet time of year, averaging 99 mm of rainfall and 82% relative humidity across the period.
October is one of the warmer months of the year in Saint-Jean-sur-Richelieu. Across 45 years of records, the warmest October in Saint-Jean-sur-Richelieu was 2017 — when the month averaged 13°C — while the coldest was 1981 at 5.2°C. Typical October days reach 13.5°C with nights near 3.6°C. The long-term trend is warming, about 0.8°C per decade.
October is a relatively wet time of year in Saint-Jean-sur-Richelieu, averaging 99 mm of rainfall. The wettest October on record was 2019 with 201 mm, while the driest was 1994 at 22 mm.
Relative humidity in Saint-Jean-sur-Richelieu during October averages 82%. The most humid October was 2005 at 88%, and the least humid was 1997 at 75%.
October receives about 2.4 kWh/m²/day of solar energy in Saint-Jean-sur-Richelieu. The sunniest Octobers were 1984, 1997 and 2024 at 2.9 kWh/m²/day, and the cloudiest were 1988, 2006 and 2018 at 2.
Average wind speed in Saint-Jean-sur-Richelieu during October is 2.5 m/s. The windiest October was 1995 at 3.1 m/s, while the calmest were 1984, 1994 and 2025 at 2.1 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 7.4°C | 7.9°C | 8.2°C | 9.3°C | 10.6°C | +3.2°C |
| Avg High | 12.5°C | 12.9°C | 12.9°C | 14.1°C | 15.8°C | +3.3°C |
| Avg Low | 2.3°C | 2.9°C | 3.6°C | 4.6°C | 5.4°C | +3.1°C |
| Avg Rain | 79 mm | 94 mm | 118 mm | 109 mm | 91 mm | +13 mm |
October temperatures in Saint-Jean-sur-Richelieu have risen by about 3.3°C between 1981–1985 and 2021–2025.
October has ranged from a record low of -5.4°C (1988) to a record high of 29.7°C (2025).
Rainfall in October is a relatively wet time of year, averaging 99 mm, with a wettest year of 201 mm.
A good time to visit Saint-Jean-sur-Richelieu
October is a good time to visit Saint-Jean-sur-Richelieu, with days averaging 13.5°C and nights around 3.6°C (mean 8.6°C, warmer than Saint-Jean-sur-Richelieu's yearly average) and higher rainfall. July and August are marginally more temperate, but October still suits most travellers.
| Year | Avg High | Avg Temp | Avg Low | Hottest Day | Coldest Day | Rainfall | Humidity | Wind | Solar |
|---|---|---|---|---|---|---|---|---|---|
| 2025 | 16.0°C | 10.5°C | 5.0°C | 29.7°C | 0.2°C | 158 mm | 79% | 2.1 m/s | 2.8 |
| 2024 | 16.0°C | 10.4°C | 4.8°C | 25.1°C | -5.0°C | 34 mm | 76% | 2.6 m/s | 2.9 |
| 2023 | 16.4°C | 11.8°C | 7.3°C | 28.6°C | -3.7°C | 118 mm | 84% | 2.4 m/s | 2.1 |
| 2022 | 15.9°C | 9.9°C | 3.9°C | 23.2°C | -1.8°C | 50 mm | 76% | 2.2 m/s | 2.8 |
| 2021 | 17.4°C | 12.6°C | 7.9°C | 25.7°C | -0.1°C | 98 mm | 80% | 2.2 m/s | 2.2 |
| 2020 | 13.1°C | 8.3°C | 3.5°C | 23.9°C | -4.4°C | 91 mm | 80% | 2.6 m/s | 2.3 |
| 2019 🌧️ | 14.2°C | 9.6°C | 4.9°C | 18.4°C | 0.4°C | 201 mm | 85% | 2.4 m/s | 2.4 |
| 2018 | 11.2°C | 6.7°C | 2.1°C | 27.5°C | -4.5°C | 81 mm | 81% | 2.7 m/s | 2 |
| 2017 🔥 | 18.2°C | 13.0°C | 7.7°C | 25.9°C | -0.4°C | 102 mm | 81% | 2.8 m/s | 2.6 |
| 2016 | 14.1°C | 9.4°C | 4.7°C | 24.8°C | -3.3°C | 144 mm | 80% | 2.5 m/s | 2.3 |
| 2015 | 12.5°C | 7.2°C | 1.8°C | 23.7°C | -5.2°C | 76 mm | 76% | 2.7 m/s | 2.6 |
| 2014 | 14.8°C | 10.6°C | 6.3°C | 25.1°C | -0.6°C | 88 mm | 83% | 2.8 m/s | 2.2 |
| 2013 | 14.9°C | 9.7°C | 4.5°C | 23.6°C | -4.5°C | 64 mm | 80% | 2.5 m/s | 2.5 |
| 2012 | 15.2°C | 10.4°C | 5.7°C | 21.4°C | -0.8°C | 86 mm | 83% | 2.5 m/s | 2.1 |
| 2011 | 13.9°C | 9.5°C | 5.1°C | 23.1°C | -3.1°C | 103 mm | 84% | 2.6 m/s | 2.4 |
| 2010 | 12.0°C | 7.3°C | 2.7°C | 19.6°C | -3.7°C | 141 mm | 84% | 2.7 m/s | 2.3 |
| 2009 | 10.8°C | 6.4°C | 2.0°C | 18.9°C | -3.9°C | 102 mm | 84% | 2.3 m/s | 2.2 |
| 2008 | 12.4°C | 7.7°C | 3.1°C | 22.5°C | -3.7°C | 104 mm | 83% | 2.3 m/s | 2.5 |
| 2007 | 15.8°C | 10.9°C | 5.9°C | 24.1°C | -4.2°C | 133 mm | 84% | 2.3 m/s | 2.6 |
| 2006 | 11.6°C | 7.3°C | 3.1°C | 19.8°C | -2.6°C | 176 mm | 86% | 2.7 m/s | 2 |
| 2005 | 13.3°C | 9.2°C | 5.1°C | 26.2°C | -2.7°C | 196 mm | 88% | 2.6 m/s | 2.2 |
| 2004 | 13.8°C | 8.7°C | 3.7°C | 23.0°C | -2.4°C | 55 mm | 84% | 2.4 m/s | 2.6 |
| 2003 | 12.0°C | 7.4°C | 2.8°C | 24.3°C | -4.3°C | 176 mm | 83% | 2.6 m/s | 2.3 |
| 2002 | 11.2°C | 6.4°C | 1.7°C | 26.3°C | -4.5°C | 100 mm | 81% | 2.4 m/s | 2.5 |
| 2001 | 14.9°C | 10.0°C | 5.1°C | 24.0°C | -3.4°C | 83 mm | 79% | 2.8 m/s | 2.4 |
| 2000 | 13.0°C | 8.1°C | 3.2°C | 21.6°C | -3.6°C | 53 mm | 84% | 2.4 m/s | 2.3 |
| 1999 | 12.3°C | 7.0°C | 1.7°C | 20.2°C | -4.7°C | 113 mm | 80% | 2.8 m/s | 2.5 |
| 1998 | 14.0°C | 9.2°C | 4.3°C | 22.2°C | -1.6°C | 76 mm | 79% | 3 m/s | 2.5 |
| 1997 | 12.9°C | 7.6°C | 2.4°C | 24.9°C | -4.8°C | 36 mm | 75% | 2.3 m/s | 2.9 |
| 1996 | 13.3°C | 7.8°C | 2.4°C | 22.5°C | -2.7°C | 85 mm | 78% | 2.8 m/s | 2.4 |
| 1995 | 14.8°C | 10.2°C | 5.6°C | 24.9°C | -4.2°C | 142 mm | 81% | 3.1 m/s | 2.4 |
| 1994 | 14.4°C | 9.0°C | 3.6°C | 23.6°C | -1.9°C | 22 mm | 79% | 2.1 m/s | 2.7 |
| 1993 | 10.7°C | 6.0°C | 1.2°C | 20.0°C | -4.0°C | 125 mm | 82% | 3 m/s | 2.3 |
| 1992 | 10.6°C | 5.7°C | 0.8°C | 19.8°C | -5.1°C | 89 mm | 82% | 2.3 m/s | 2.2 |
| 1991 | 14.0°C | 8.6°C | 3.3°C | 23.2°C | -4.1°C | 102 mm | 85% | 2.5 m/s | 2.3 |
| 1990 | 12.4°C | 8.1°C | 3.8°C | 24.0°C | -5.0°C | 149 mm | 86% | 2.8 m/s | 2.3 |
| 1989 | 13.6°C | 8.4°C | 3.2°C | 23.6°C | -3.1°C | 102 mm | 84% | 2.6 m/s | 2.5 |
| 1988 | 10.8°C | 6.1°C | 1.3°C | 25.8°C | -5.4°C | 90 mm | 82% | 2.9 m/s | 2 |
| 1987 | 12.2°C | 6.8°C | 1.4°C | 19.9°C | -4.1°C | 79 mm | 79% | 2.6 m/s | 2.5 |
| 1986 | 11.8°C | 6.8°C | 1.8°C | 18.8°C | -4.9°C | 80 mm | 83% | 2.3 m/s | 2.4 |
| 1985 | 13.0°C | 8.0°C | 3.0°C | 20.6°C | -4.0°C | 100 mm | 80% | 2.5 m/s | 2.4 |
| 1984 | 14.2°C | 8.9°C | 3.6°C | 22.8°C | -4.8°C | 47 mm | 80% | 2.1 m/s | 2.9 |
| 1983 | 13.0°C | 7.9°C | 2.7°C | 26.3°C | -4.5°C | 80 mm | 80% | 2.6 m/s | — |
| 1982 | 13.8°C | 8.5°C | 3.2°C | 19.7°C | -3.8°C | 40 mm | 81% | 2.4 m/s | — |
| 1981 ❄️ | 10.0°C | 5.2°C | 0.3°C | 16.9°C | -4.5°C | 92 mm | 84% | 2.3 m/s | — |
Actual recorded October data for each year, 1981–2025 — sourced from NASA POWER.
The average high in October is around 13.5°C with lows near 3.6°C (mean 8.6°C), based on 45 years of NASA POWER data.
October averages 99 mm of rainfall in Saint-Jean-sur-Richelieu, a relatively wet time of year. The wettest on record was 201 mm in 2019.
The hottest October reached 29.7°C in 2025. The coldest dipped to -5.4°C in 1988.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average October temperatures have risen by about 3.3°C. Daytime highs moved from 12.8°C to 16.3°C and overnight lows from 2.6°C to 5.8°C over the same span.
October is one of the warmer months of the year in Saint-Jean-sur-Richelieu and a relatively wet time of year, so plan for around 13.5°C daytime highs and 3.6°C at night.
Not quite — October is the 7th coolest month in Saint-Jean-sur-Richelieu, averaging 8.6°C.
For October in Saint-Jean-sur-Richelieu, pack warm layers and a jacket for chilly mornings, with typical highs of 13.5°C and lows of 3.6°C. Bring an umbrella or light rain jacket too.
Relative humidity in October averages 82% — quite humid.
Average wind speed in October is 2.5 m/s. The windiest October on record averaged 3.1 m/s (1995).
The wettest October on record was 2019 with 201 mm. On average, October sees 99 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 Saint-Jean-sur-Richelieu behaves each October, 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 October specifically, along with year-by-year records and how the month has changed over the decades.
