October is one of the warmer months of the year in Saint John, with average highs near 12.5°C and lows around 4°C (mean 8.3°C). It is a relatively wet time of year, averaging 110 mm of rainfall and 86% relative humidity across the period.
October is one of the warmer months of the year in Saint John. Across 45 years of records, the warmest Octobers in Saint John were 2017 and 2023 — when the month averaged 11.2°C — while the coldest was 1993 at 5.6°C. Typical October days reach 12.5°C with nights near 4°C. The long-term trend is warming, about 0.6°C per decade.
October is a relatively wet time of year in Saint John, averaging 110 mm of rainfall. The wettest October on record was 2005 with 236 mm, while the driest was 1997 at 32 mm.
Relative humidity in Saint John during October averages 86%. The most humid October was 2005 at 89%, and the least humid was 1985 at 82%.
October receives about 2.5 kWh/m²/day of solar energy in Saint John. The sunniest October was 2022 at 3 kWh/m²/day, and the cloudiest were 2009 and 2018 at 2.1.
Average wind speed in Saint John during October is 0.6 m/s. The windiest October was 1998 at 0.7 m/s, while the calmest were 2023, 2024 and 2025, 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 | 7.3°C | 7.6°C | 8.2°C | 8.8°C | 10.1°C | +2.8°C |
| Avg High | 11.7°C | 11.9°C | 12.4°C | 12.9°C | 14.5°C | +2.8°C |
| Avg Low | 2.8°C | 3.3°C | 4.0°C | 4.7°C | 5.7°C | +2.9°C |
| Avg Rain | 82 mm | 114 mm | 134 mm | 125 mm | 79 mm | -3 mm |
October temperatures in Saint John have risen by about 3.1°C between 1981–1985 and 2021–2025.
October has ranged from a record low of -5°C (1999) to a record high of 24.9°C (2025).
Rainfall in October is a relatively wet time of year, averaging 110 mm, with a wettest year of 236 mm.
A good time to visit Saint John
October is a good time to visit Saint John, with days averaging 12.5°C and nights around 4°C (mean 8.3°C, warmer than Saint John'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 | 14.8°C | 10.3°C | 5.8°C | 24.9°C | 0.9°C | 87 mm | 85% | 0.5 m/s | 2.7 |
| 2024 | 13.8°C | 9.4°C | 4.9°C | 19.6°C | -4.0°C | 61 mm | 86% | 0.5 m/s | 2.6 |
| 2023 | 15.1°C | 11.2°C | 7.4°C | 23.6°C | -4.3°C | 98 mm | 89% | 0.5 m/s | 2.3 |
| 2022 | 15.3°C | 10.7°C | 6.2°C | 19.5°C | -1.0°C | 91 mm | 87% | 0.5 m/s | 3 |
| 2021 | 15.1°C | 10.8°C | 6.4°C | 22.8°C | 1.9°C | 60 mm | 87% | 0.5 m/s | 2.6 |
| 2020 | 12.7°C | 8.2°C | 3.6°C | 19.3°C | -4.6°C | 76 mm | 84% | 0.6 m/s | 2.5 |
| 2019 | 12.7°C | 8.8°C | 5.0°C | 16.7°C | -1.1°C | 123 mm | 87% | 0.6 m/s | 2.4 |
| 2018 | 10.1°C | 6.2°C | 2.3°C | 20.6°C | -5.0°C | 160 mm | 86% | 0.6 m/s | 2.1 |
| 2017 🔥 | 15.6°C | 11.2°C | 6.7°C | 21.5°C | 0.7°C | 97 mm | 86% | 0.6 m/s | 2.9 |
| 2016 | 13.2°C | 8.9°C | 4.5°C | 21.9°C | -0.6°C | 97 mm | 86% | 0.6 m/s | 2.5 |
| 2015 | 11.6°C | 7.0°C | 2.4°C | 18.0°C | -4.0°C | 80 mm | 85% | 0.6 m/s | 2.7 |
| 2014 | 14.0°C | 10.2°C | 6.3°C | 20.0°C | -0.4°C | 139 mm | 89% | 0.6 m/s | 2.2 |
| 2013 | 13.3°C | 8.6°C | 3.9°C | 21.6°C | -3.9°C | 64 mm | 86% | 0.5 m/s | 2.9 |
| 2012 | 13.8°C | 9.5°C | 5.3°C | 20.2°C | -3.5°C | 188 mm | 86% | 0.6 m/s | 2.5 |
| 2011 | 12.8°C | 9.2°C | 5.6°C | 23.9°C | -2.5°C | 142 mm | 87% | 0.6 m/s | 2.3 |
| 2010 | 12.3°C | 8.5°C | 4.8°C | 21.7°C | -0.1°C | 156 mm | 85% | 0.6 m/s | 2.5 |
| 2009 | 9.7°C | 5.8°C | 1.8°C | 16.4°C | -3.4°C | 202 mm | 86% | 0.6 m/s | 2.1 |
| 2008 | 12.4°C | 8.0°C | 3.6°C | 17.0°C | -3.8°C | 131 mm | 86% | 0.6 m/s | 2.6 |
| 2007 | 14.2°C | 9.9°C | 5.5°C | 21.2°C | -1.9°C | 77 mm | 85% | 0.5 m/s | 2.8 |
| 2006 | 12.5°C | 8.3°C | 4.0°C | 19.2°C | -1.2°C | 158 mm | 85% | 0.6 m/s | 2.5 |
| 2005 🌧️ | 13.1°C | 9.5°C | 5.8°C | 21.5°C | -2.0°C | 236 mm | 89% | 0.6 m/s | 2.2 |
| 2004 | 12.7°C | 8.8°C | 5.0°C | 19.6°C | -3.4°C | 53 mm | 87% | 0.6 m/s | 2.6 |
| 2003 | 12.4°C | 8.2°C | 4.1°C | 21.1°C | -2.0°C | 205 mm | 87% | 0.6 m/s | 2.5 |
| 2002 | 10.8°C | 6.2°C | 1.7°C | 23.9°C | -4.4°C | 84 mm | 83% | 0.6 m/s | 2.7 |
| 2001 | 14.3°C | 9.5°C | 4.6°C | 21.0°C | -3.9°C | 81 mm | 83% | 0.5 m/s | 2.8 |
| 2000 | 12.1°C | 7.9°C | 3.8°C | 20.2°C | -3.5°C | 111 mm | 86% | 0.6 m/s | 2.4 |
| 1999 | 11.5°C | 6.9°C | 2.2°C | 17.5°C | -5.0°C | 85 mm | 83% | 0.6 m/s | 2.4 |
| 1998 | 11.0°C | 7.3°C | 3.5°C | 17.4°C | -2.3°C | 147 mm | 85% | 0.7 m/s | 2.3 |
| 1997 | 10.8°C | 6.5°C | 2.2°C | 18.3°C | -4.4°C | 32 mm | 83% | 0.5 m/s | 2.5 |
| 1996 | 10.8°C | 6.5°C | 2.2°C | 17.1°C | -2.3°C | 104 mm | 85% | 0.6 m/s | 2.8 |
| 1995 | 14.3°C | 10.1°C | 5.9°C | 20.7°C | -3.9°C | 136 mm | 87% | 0.5 m/s | 2.4 |
| 1994 | 12.7°C | 8.2°C | 3.7°C | 18.5°C | -1.9°C | 50 mm | 84% | 0.6 m/s | 2.9 |
| 1993 ❄️ | 10.3°C | 5.6°C | 1.0°C | 15.7°C | -4.9°C | 176 mm | 84% | 0.6 m/s | 2.2 |
| 1992 | 10.9°C | 6.6°C | 2.3°C | 17.2°C | -4.4°C | 151 mm | 86% | 0.5 m/s | 2.3 |
| 1991 | 13.4°C | 9.2°C | 5.0°C | 18.7°C | -2.8°C | 116 mm | 87% | 0.6 m/s | 2.2 |
| 1990 | 13.1°C | 9.0°C | 4.8°C | 21.0°C | -3.8°C | 141 mm | 87% | 0.6 m/s | 2.3 |
| 1989 | 12.4°C | 7.8°C | 3.2°C | 18.6°C | -1.9°C | 69 mm | 86% | 0.6 m/s | 2.6 |
| 1988 | 10.1°C | 6.2°C | 2.4°C | 21.7°C | -3.1°C | 124 mm | 86% | 0.6 m/s | 2.5 |
| 1987 | 12.6°C | 7.9°C | 3.2°C | 17.9°C | -3.0°C | 102 mm | 87% | 0.5 m/s | 2.8 |
| 1986 | 10.9°C | 6.3°C | 1.6°C | 18.1°C | -4.1°C | 40 mm | 85% | 0.6 m/s | 2.7 |
| 1985 | 12.0°C | 7.6°C | 3.3°C | 20.4°C | -4.7°C | 71 mm | 82% | 0.6 m/s | 2.4 |
| 1984 | 12.2°C | 7.5°C | 2.9°C | 18.2°C | -2.2°C | 52 mm | 85% | 0.5 m/s | 2.9 |
| 1983 | 12.0°C | 7.6°C | 3.3°C | 21.9°C | -3.8°C | 64 mm | 84% | 0.6 m/s | — |
| 1982 | 12.1°C | 7.6°C | 3.0°C | 19.5°C | -4.8°C | 44 mm | 86% | 0.5 m/s | — |
| 1981 | 11.1°C | 6.9°C | 2.7°C | 15.2°C | -2.9°C | 171 mm | 86% | 0.6 m/s | — |
Actual recorded October data for each year, 1981–2025 — sourced from NASA POWER.
The average high in October is around 12.5°C with lows near 4°C (mean 8.3°C), based on 45 years of NASA POWER data.
October averages 110 mm of rainfall in Saint John, a relatively wet time of year. The wettest on record was 236 mm in 2005.
The hottest October reached 24.9°C in 2025. The coldest dipped to -5°C in 1999.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average October temperatures have risen by about 3.1°C. Daytime highs moved from 11.9°C to 14.8°C and overnight lows from 3°C to 6.1°C over the same span.
October is one of the warmer months of the year in Saint John and a relatively wet time of year, so plan for around 12.5°C daytime highs and 4°C at night.
Not quite — October is the 7th coolest month in Saint John, averaging 8.3°C.
For October in Saint John, pack warm layers and a jacket for chilly mornings, with typical highs of 12.5°C and lows of 4°C. Bring an umbrella or light rain jacket too.
Relative humidity in October averages 86% — quite humid.
Average wind speed in October is 0.6 m/s. The windiest October on record averaged 0.7 m/s (1998).
The wettest October on record was 2005 with 236 mm. On average, October sees 110 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 John 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.
