October is one of the warmer months of the year in Guelph, with average highs near 15°C and lows around 4.7°C (mean 9.9°C). It is about average for rainfall, averaging 66 mm of rainfall and 78% relative humidity across the period.
October is one of the warmer months of the year in Guelph. Across 45 years of records, the warmest October in Guelph was 2007 — when the month averaged 14°C — while the coldest was 1981 at 6.7°C. Typical October days reach 15°C with nights near 4.7°C. The long-term trend is warming, about 0.6°C per decade.
October is about average for rainfall in Guelph, averaging 66 mm of rainfall. The wettest October on record was 2001 with 136 mm, while the driest was 1984 at 31 mm.
Relative humidity in Guelph during October averages 78%. The most humid October was 1986 at 85%, and the least humid was 2024 at 70%.
October receives about 2.6 kWh/m²/day of solar energy in Guelph. The sunniest Octobers were 1998 and 2024 at 3.1 kWh/m²/day, and the cloudiest were 2012, 2018 and 2021, among others at 2.2.
Average wind speed in Guelph during October is 3 m/s. The windiest October was 1995 at 3.7 m/s, while the calmest was 1984 at 2.3 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 8.8°C | 9.3°C | 9.7°C | 10.4°C | 11.5°C | +2.7°C |
| Avg High | 14.0°C | 14.8°C | 14.8°C | 15.4°C | 16.8°C | +2.8°C |
| Avg Low | 3.5°C | 3.9°C | 4.7°C | 5.5°C | 6.1°C | +2.6°C |
| Avg Rain | 67 mm | 60 mm | 65 mm | 82 mm | 53 mm | -14 mm |
October temperatures in Guelph have risen by about 2.6°C between 1981–1985 and 2021–2025.
October has ranged from a record low of -4.9°C (2020) to a record high of 30.8°C (2023).
Rainfall in October is about average for rainfall, averaging 66 mm, with a wettest year of 136 mm.
A good time to visit Guelph
October is a good time to visit Guelph, with days averaging 15°C and nights around 4.7°C (mean 9.9°C, warmer than Guelph'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 | 17.2°C | 11.6°C | 6.0°C | 29.3°C | -1.4°C | 51 mm | 75% | 2.7 m/s | 3 |
| 2024 | 18.2°C | 11.9°C | 5.6°C | 26.7°C | -0.7°C | 35 mm | 70% | 2.8 m/s | 3.1 |
| 2023 | 17.0°C | 12.2°C | 7.3°C | 30.8°C | -1.7°C | 54 mm | 76% | 3 m/s | 2.4 |
| 2022 | 16.2°C | 10.3°C | 4.5°C | 26.0°C | -1.4°C | 33 mm | 70% | 2.7 m/s | 3 |
| 2021 | 17.7°C | 13.4°C | 9.2°C | 25.5°C | 2.2°C | 86 mm | 84% | 2.8 m/s | 2.2 |
| 2020 | 14.2°C | 9.3°C | 4.3°C | 25.1°C | -4.9°C | 56 mm | 76% | 3.1 m/s | 2.4 |
| 2019 | 15.7°C | 10.6°C | 5.5°C | 30.2°C | 0.0°C | 101 mm | 80% | 3 m/s | 2.7 |
| 2018 | 13.9°C | 8.9°C | 4.0°C | 27.4°C | -3.0°C | 74 mm | 81% | 3.3 m/s | 2.2 |
| 2017 | 18.5°C | 13.0°C | 7.5°C | 26.7°C | 0.4°C | 57 mm | 76% | 3.2 m/s | 2.8 |
| 2016 | 16.6°C | 11.3°C | 5.9°C | 25.9°C | -3.7°C | 43 mm | 78% | 2.8 m/s | 2.7 |
| 2015 | 14.8°C | 9.9°C | 4.9°C | 22.7°C | -3.2°C | 81 mm | 74% | 3.4 m/s | 2.6 |
| 2014 | 14.8°C | 10.1°C | 5.4°C | 24.8°C | -1.6°C | 70 mm | 82% | 3 m/s | 2.3 |
| 2013 | 15.4°C | 10.6°C | 5.8°C | 24.6°C | -3.8°C | 116 mm | 82% | 2.7 m/s | 2.7 |
| 2012 | 14.2°C | 9.7°C | 5.3°C | 22.6°C | 0.1°C | 121 mm | 82% | 3.2 m/s | 2.2 |
| 2011 | 14.8°C | 10.2°C | 5.7°C | 26.9°C | -2.4°C | 106 mm | 79% | 2.9 m/s | 2.5 |
| 2010 | 14.8°C | 9.8°C | 4.7°C | 23.3°C | -2.9°C | 56 mm | 75% | 3 m/s | 2.8 |
| 2009 | 13.0°C | 8.3°C | 3.5°C | 17.7°C | -2.8°C | 69 mm | 80% | 3 m/s | 2.2 |
| 2008 | 14.3°C | 8.8°C | 3.2°C | 25.9°C | -4.6°C | 46 mm | 77% | 2.8 m/s | 2.9 |
| 2007 🔥 | 19.3°C | 14.0°C | 8.7°C | 29.5°C | -0.2°C | 51 mm | 76% | 3 m/s | 2.5 |
| 2006 | 13.2°C | 8.2°C | 3.1°C | 25.2°C | -2.3°C | 88 mm | 82% | 3.3 m/s | 2.4 |
| 2005 | 15.9°C | 11.1°C | 6.3°C | 29.3°C | -1.8°C | 36 mm | 79% | 2.9 m/s | 2.6 |
| 2004 | 15.4°C | 10.5°C | 5.6°C | 27.0°C | -0.1°C | 56 mm | 78% | 3.1 m/s | 2.5 |
| 2003 | 13.3°C | 8.3°C | 3.2°C | 25.2°C | -3.4°C | 80 mm | 81% | 2.8 m/s | 2.6 |
| 2002 | 13.2°C | 8.3°C | 3.4°C | 28.6°C | -3.7°C | 46 mm | 77% | 2.9 m/s | 2.4 |
| 2001 🌧️ | 14.2°C | 9.5°C | 4.8°C | 24.7°C | -1.7°C | 136 mm | 81% | 3.5 m/s | 2.3 |
| 2000 | 15.7°C | 10.4°C | 5.1°C | 22.5°C | -3.0°C | 40 mm | 80% | 2.5 m/s | 2.8 |
| 1999 | 14.5°C | 9.0°C | 3.5°C | 23.5°C | -3.2°C | 55 mm | 74% | 3.1 m/s | 2.7 |
| 1998 | 16.8°C | 11.1°C | 5.4°C | 21.8°C | -1.4°C | 33 mm | 72% | 2.9 m/s | 3.1 |
| 1997 | 15.2°C | 9.6°C | 3.9°C | 27.2°C | -3.3°C | 46 mm | 75% | 2.6 m/s | 3 |
| 1996 | 14.2°C | 9.0°C | 3.8°C | 24.0°C | -3.4°C | 57 mm | 80% | 3.2 m/s | 2.4 |
| 1995 | 15.9°C | 10.7°C | 5.5°C | 26.8°C | -0.3°C | 65 mm | 77% | 3.7 m/s | 2.4 |
| 1994 | 16.1°C | 10.3°C | 4.5°C | 24.6°C | 0.1°C | 31 mm | 73% | 2.6 m/s | 3 |
| 1993 | 13.4°C | 7.6°C | 1.9°C | 25.4°C | -4.1°C | 70 mm | 77% | 3.5 m/s | 2.4 |
| 1992 | 12.4°C | 7.2°C | 1.9°C | 22.1°C | -3.9°C | 75 mm | 81% | 2.9 m/s | 2.5 |
| 1991 | 15.5°C | 10.2°C | 4.9°C | 25.6°C | -3.7°C | 74 mm | 75% | 3.1 m/s | 2.7 |
| 1990 | 14.0°C | 8.8°C | 3.7°C | 24.8°C | -4.5°C | 95 mm | 80% | 3.4 m/s | 2.8 |
| 1989 | 15.9°C | 10.1°C | 4.3°C | 24.7°C | -2.1°C | 46 mm | 75% | 3.2 m/s | 2.6 |
| 1988 | 11.1°C | 6.8°C | 2.4°C | 26.3°C | -4.6°C | 84 mm | 79% | 3.3 m/s | 2.4 |
| 1987 | 12.7°C | 7.1°C | 1.6°C | 20.0°C | -3.6°C | 69 mm | 75% | 2.9 m/s | 2.6 |
| 1986 | 13.4°C | 8.4°C | 3.3°C | 20.1°C | -3.8°C | 76 mm | 85% | 2.7 m/s | 2.7 |
| 1985 | 14.6°C | 9.4°C | 4.3°C | 20.1°C | -3.6°C | 103 mm | 77% | 2.9 m/s | 2.8 |
| 1984 | 16.9°C | 11.2°C | 5.4°C | 21.6°C | 0.2°C | 31 mm | 75% | 2.3 m/s | 3 |
| 1983 | 14.6°C | 9.5°C | 4.5°C | 26.0°C | -2.9°C | 61 mm | 76% | 3.2 m/s | — |
| 1982 | 15.5°C | 9.8°C | 4.1°C | 24.0°C | -3.5°C | 46 mm | 79% | 2.6 m/s | — |
| 1981 ❄️ | 11.4°C | 6.7°C | 1.9°C | 19.0°C | -4.7°C | 86 mm | 82% | 3 m/s | — |
Actual recorded October data for each year, 1981–2025 — sourced from NASA POWER.
The average high in October is around 15°C with lows near 4.7°C (mean 9.9°C), based on 45 years of NASA POWER data.
October averages 66 mm of rainfall in Guelph, about average for rainfall. The wettest on record was 136 mm in 2001.
The hottest October reached 30.8°C in 2023. The coldest dipped to -4.9°C in 2020.
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 14.6°C to 17.3°C and overnight lows from 4°C to 6.5°C over the same span.
October is one of the warmer months of the year in Guelph and about average for rainfall, so plan for around 15°C daytime highs and 4.7°C at night.
Not quite — October is the 7th coolest month in Guelph, averaging 9.9°C.
For October in Guelph, pack warm layers and a jacket for chilly mornings, with typical highs of 15°C and lows of 4.7°C. Bring an umbrella or light rain jacket too.
Relative humidity in October averages 78% — quite humid.
Average wind speed in October is 3 m/s. The windiest October on record averaged 3.7 m/s (1995).
The wettest October on record was 2001 with 136 mm. On average, October sees 66 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 Guelph 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.
