October is one of the warmer months of the year in St. Catharines, with average highs near 14.7°C and lows around 7.8°C (mean 11.3°C). It is a relatively wet time of year, averaging 77 mm of rainfall and 77% relative humidity across the period.
October is one of the warmer months of the year in St. Catharines. Across 45 years of records, the warmest October in St. Catharines was 2021 — when the month averaged 15.6°C — while the coldest was 1988 at 7.5°C. Typical October days reach 14.7°C with nights near 7.8°C. The long-term trend is warming, about 0.9°C per decade.
October is a relatively wet time of year in St. Catharines, averaging 77 mm of rainfall. The wettest October on record was 2012 with 141 mm, while the driest was 1994 at 30 mm.
Relative humidity in St. Catharines during October averages 77%. The most humid October was 1986 at 82%, and the least humid was 2024 at 70%.
October receives about 2.6 kWh/m²/day of solar energy in St. Catharines. The sunniest Octobers were 1997, 1998 and 2024 at 3 kWh/m²/day, and the cloudiest was 2018 at 2.1.
Average wind speed in St. Catharines during October is 3.7 m/s. The windiest October was 2006 at 4.5 m/s, while the calmest was 1984 at 2.8 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 10.1°C | 10.2°C | 11.1°C | 12.4°C | 13.3°C | +3.2°C |
| Avg High | 13.7°C | 13.9°C | 14.4°C | 15.7°C | 16.7°C | +3°C |
| Avg Low | 6.6°C | 6.4°C | 7.8°C | 9.2°C | 10.0°C | +3.4°C |
| Avg Rain | 78 mm | 61 mm | 81 mm | 95 mm | 64 mm | -14 mm |
October temperatures in St. Catharines have risen by about 2.6°C between 1981–1985 and 2021–2025.
October has ranged from a record low of -1.6°C (1990) to a record high of 27.8°C (2007).
Rainfall in October is a relatively wet time of year, averaging 77 mm, with a wettest year of 141 mm.
A good time to visit St. Catharines
October is a good time to visit St. Catharines, with days averaging 14.7°C and nights around 7.8°C (mean 11.3°C, warmer than St. Catharines's yearly average) and moderate 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 | 17.1°C | 13.5°C | 9.9°C | 26.9°C | 4.6°C | 85 mm | 72% | 3.8 m/s | 2.9 |
| 2024 | 17.5°C | 13.8°C | 10.1°C | 24.6°C | 4.5°C | 37 mm | 70% | 3.7 m/s | 3 |
| 2023 | 16.5°C | 13.5°C | 10.5°C | 27.4°C | 2.9°C | 69 mm | 75% | 3.8 m/s | 2.5 |
| 2022 | 15.5°C | 11.9°C | 8.2°C | 21.9°C | 4.0°C | 43 mm | 72% | 3.8 m/s | 2.9 |
| 2021 🔥 | 18.6°C | 15.6°C | 12.6°C | 25.4°C | 7.2°C | 88 mm | 81% | 3.4 m/s | 2.2 |
| 2020 | 14.8°C | 11.6°C | 8.4°C | 23.0°C | 0.3°C | 61 mm | 74% | 4 m/s | 2.4 |
| 2019 | 16.3°C | 12.8°C | 9.2°C | 27.1°C | 5.6°C | 110 mm | 79% | 3.8 m/s | 2.7 |
| 2018 | 14.6°C | 11.2°C | 7.9°C | 25.6°C | 1.6°C | 99 mm | 80% | 4.2 m/s | 2.1 |
| 2017 | 18.1°C | 14.7°C | 11.2°C | 24.7°C | 5.4°C | 92 mm | 76% | 4 m/s | 2.7 |
| 2016 | 16.7°C | 13.2°C | 9.7°C | 24.7°C | 2.0°C | 65 mm | 76% | 3.6 m/s | 2.7 |
| 2015 | 14.9°C | 11.8°C | 8.7°C | 21.8°C | 2.9°C | 77 mm | 74% | 4.3 m/s | 2.7 |
| 2014 | 15.6°C | 12.3°C | 9.0°C | 23.9°C | 3.6°C | 70 mm | 79% | 4 m/s | 2.4 |
| 2013 | 16.1°C | 13.0°C | 9.8°C | 24.9°C | 2.8°C | 110 mm | 79% | 3.6 m/s | 2.7 |
| 2012 🌧️ | 14.4°C | 11.4°C | 8.5°C | 21.8°C | 4.3°C | 141 mm | 81% | 4 m/s | 2.2 |
| 2011 | 15.2°C | 12.1°C | 9.0°C | 24.8°C | 2.4°C | 107 mm | 77% | 3.8 m/s | 2.5 |
| 2010 | 14.6°C | 11.6°C | 8.5°C | 20.4°C | 2.6°C | 79 mm | 75% | 4 m/s | 2.7 |
| 2009 | 13.0°C | 10.1°C | 7.2°C | 17.6°C | 2.7°C | 85 mm | 79% | 3.8 m/s | 2.2 |
| 2008 | 14.3°C | 10.9°C | 7.4°C | 23.0°C | 0.4°C | 78 mm | 74% | 3.9 m/s | 2.9 |
| 2007 | 19.0°C | 15.5°C | 12.0°C | 27.8°C | 4.5°C | 54 mm | 76% | 3.6 m/s | 2.4 |
| 2006 | 13.2°C | 10.1°C | 7.0°C | 21.1°C | 1.9°C | 139 mm | 81% | 4.5 m/s | 2.4 |
| 2005 | 15.1°C | 12.2°C | 9.3°C | 25.3°C | 3.6°C | 80 mm | 80% | 3.6 m/s | 2.5 |
| 2004 | 15.4°C | 12.3°C | 9.1°C | 23.1°C | 5.4°C | 66 mm | 78% | 3.8 m/s | 2.4 |
| 2003 | 12.4°C | 8.9°C | 5.3°C | 21.6°C | 0.1°C | 80 mm | 81% | 3.2 m/s | 2.6 |
| 2002 | 12.4°C | 9.1°C | 5.8°C | 23.0°C | -0.3°C | 75 mm | 79% | 3.3 m/s | 2.5 |
| 2001 | 13.8°C | 10.2°C | 6.7°C | 21.7°C | 1.0°C | 106 mm | 79% | 4 m/s | 2.4 |
| 2000 | 15.3°C | 11.9°C | 8.5°C | 22.0°C | 3.0°C | 48 mm | 79% | 3.3 m/s | 2.7 |
| 1999 | 13.3°C | 9.6°C | 5.9°C | 19.0°C | 1.1°C | 78 mm | 77% | 3.5 m/s | 2.7 |
| 1998 | 16.2°C | 12.6°C | 9.0°C | 21.9°C | 4.2°C | 50 mm | 72% | 3.9 m/s | 3 |
| 1997 | 15.0°C | 11.5°C | 8.0°C | 24.4°C | 1.5°C | 44 mm | 73% | 3.5 m/s | 3 |
| 1996 | 13.5°C | 9.7°C | 5.8°C | 21.3°C | 0.9°C | 67 mm | 80% | 3.7 m/s | 2.3 |
| 1995 | 14.6°C | 11.0°C | 7.4°C | 21.5°C | 2.4°C | 86 mm | 79% | 4 m/s | 2.5 |
| 1994 | 14.3°C | 10.3°C | 6.3°C | 20.7°C | 2.8°C | 30 mm | 76% | 3 m/s | 2.9 |
| 1993 | 12.7°C | 8.4°C | 4.1°C | 20.7°C | -0.6°C | 65 mm | 76% | 3.9 m/s | 2.4 |
| 1992 | 11.9°C | 8.2°C | 4.4°C | 19.2°C | -1.1°C | 60 mm | 79% | 3.4 m/s | 2.5 |
| 1991 | 14.6°C | 10.7°C | 6.8°C | 22.1°C | -0.1°C | 45 mm | 75% | 3.4 m/s | 2.6 |
| 1990 | 13.3°C | 9.8°C | 6.3°C | 21.0°C | -1.6°C | 86 mm | 80% | 3.8 m/s | 2.6 |
| 1989 | 14.2°C | 10.1°C | 6.0°C | 20.0°C | 0.6°C | 56 mm | 79% | 3.6 m/s | 2.5 |
| 1988 ❄️ | 10.4°C | 7.5°C | 4.7°C | 22.3°C | -1.3°C | 109 mm | 79% | 3.8 m/s | 2.5 |
| 1987 | 11.2°C | 7.6°C | 4.0°C | 17.1°C | -0.2°C | 85 mm | 79% | 3.4 m/s | 2.6 |
| 1986 | 13.9°C | 10.4°C | 7.0°C | 19.8°C | 2.3°C | 99 mm | 82% | 3.6 m/s | 2.7 |
| 1985 | 15.1°C | 11.6°C | 8.0°C | 20.3°C | 2.2°C | 104 mm | 75% | 3.6 m/s | 2.7 |
| 1984 | 16.5°C | 12.6°C | 8.8°C | 20.8°C | 4.1°C | 36 mm | 77% | 2.8 m/s | 2.9 |
| 1983 | 14.8°C | 11.4°C | 8.0°C | 23.3°C | 1.7°C | 80 mm | 75% | 4 m/s | — |
| 1982 | 15.3°C | 11.5°C | 7.8°C | 23.7°C | 1.4°C | 56 mm | 77% | 3.3 m/s | — |
| 1981 | 12.0°C | 8.4°C | 4.8°C | 18.0°C | -0.3°C | 76 mm | 80% | 3.8 m/s | — |
Actual recorded October data for each year, 1981–2025 — sourced from NASA POWER.
The average high in October is around 14.7°C with lows near 7.8°C (mean 11.3°C), based on 45 years of NASA POWER data.
October averages 77 mm of rainfall in St. Catharines, a relatively wet time of year. The wettest on record was 141 mm in 2012.
The hottest October reached 27.8°C in 2007. The coldest dipped to -1.6°C in 1990.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average October temperatures have risen by about 2.6°C. Daytime highs moved from 14.7°C to 17°C and overnight lows from 7.5°C to 10.3°C over the same span.
October is one of the warmer months of the year in St. Catharines and a relatively wet time of year, so plan for around 14.7°C daytime highs and 7.8°C at night.
Not quite — October is the 7th coolest month in St. Catharines, averaging 11.3°C.
For October in St. Catharines, pack warm layers and a jacket for chilly mornings, with typical highs of 14.7°C and lows of 7.8°C. Bring an umbrella or light rain jacket too.
Relative humidity in October averages 77% — quite humid.
Average wind speed in October is 3.7 m/s. The windiest October on record averaged 4.5 m/s (2006).
The wettest October on record was 2012 with 141 mm. On average, October sees 77 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 St. Catharines 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.
