October is one of the warmer months of the year in Oshawa, with average highs near 13.9°C and lows around 5.6°C (mean 9.8°C). It is about average for rainfall, averaging 61 mm of rainfall and 78% relative humidity across the period.
October is one of the warmer months of the year in Oshawa. Across 45 years of records, the warmest October in Oshawa was 2021 — when the month averaged 13.7°C — while the coldest was 1981 at 6.7°C. Typical October days reach 13.9°C with nights near 5.6°C. The long-term trend is warming, about 0.8°C per decade.
October is about average for rainfall in Oshawa, averaging 61 mm of rainfall. The wettest October on record was 2006 with 132 mm, while the driest was 1994 at 26 mm.
Relative humidity in Oshawa during October averages 78%. The most humid October was 2006 at 83%, and the least humid was 2022 at 72%.
October receives about 2.6 kWh/m²/day of solar energy in Oshawa. The sunniest October was 2024 at 3.1 kWh/m²/day, and the cloudiest was 2018 at 2.1.
Average wind speed in Oshawa during October is 3.5 m/s. The windiest October was 2015 at 4 m/s, while the calmest was 1984 at 2.6 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 8.7°C | 8.9°C | 9.6°C | 10.7°C | 11.7°C | +3°C |
| Avg High | 12.9°C | 13.2°C | 13.7°C | 14.7°C | 15.8°C | +2.9°C |
| Avg Low | 4.5°C | 4.5°C | 5.5°C | 6.8°C | 7.5°C | +3°C |
| Avg Rain | 55 mm | 63 mm | 69 mm | 63 mm | 49 mm | -6 mm |
October temperatures in Oshawa have risen by about 2.8°C between 1981–1985 and 2021–2025.
October has ranged from a record low of -3.6°C (1992) to a record high of 29.1°C (2023).
Rainfall in October is about average for rainfall, averaging 61 mm, with a wettest year of 132 mm.
Daytime highs and overnight lows have shifted differently — highs rose about 0.7°C per decade while lows rose 0.9°C per decade, narrowing the gap between day and night.
A good time to visit Oshawa
October is a good time to visit Oshawa, with days averaging 13.9°C and nights around 5.6°C (mean 9.8°C, warmer than Oshawa'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 | 16.3°C | 11.7°C | 7.2°C | 27.1°C | -0.7°C | 62 mm | 73% | 3.2 m/s | 2.9 |
| 2024 | 16.5°C | 11.8°C | 7.2°C | 23.9°C | 1.7°C | 38 mm | 74% | 3.4 m/s | 3.1 |
| 2023 | 16.3°C | 12.5°C | 8.7°C | 29.1°C | 0.2°C | 38 mm | 74% | 3.4 m/s | 2.5 |
| 2022 | 15.2°C | 10.6°C | 5.9°C | 23.3°C | 1.3°C | 29 mm | 72% | 3.1 m/s | 2.9 |
| 2021 🔥 | 17.4°C | 13.7°C | 10.1°C | 24.9°C | 3.2°C | 82 mm | 82% | 3.2 m/s | 2.3 |
| 2020 | 13.2°C | 9.6°C | 6.0°C | 22.4°C | -2.7°C | 47 mm | 76% | 3.6 m/s | 2.5 |
| 2019 | 15.0°C | 10.9°C | 6.8°C | 27.9°C | 1.3°C | 74 mm | 79% | 3.7 m/s | 2.7 |
| 2018 | 12.7°C | 8.8°C | 4.9°C | 26.2°C | -1.5°C | 52 mm | 78% | 3.9 m/s | 2.1 |
| 2017 | 17.4°C | 13.1°C | 8.8°C | 25.2°C | 3.3°C | 69 mm | 76% | 3.8 m/s | 2.7 |
| 2016 | 15.6°C | 11.5°C | 7.5°C | 23.7°C | -1.8°C | 53 mm | 76% | 3.6 m/s | 2.7 |
| 2015 | 13.6°C | 9.7°C | 5.7°C | 21.2°C | -1.1°C | 74 mm | 74% | 4 m/s | 2.7 |
| 2014 | 14.6°C | 10.8°C | 7.0°C | 23.9°C | 0.5°C | 58 mm | 80% | 3.7 m/s | 2.5 |
| 2013 | 15.1°C | 11.1°C | 7.1°C | 23.3°C | -3.6°C | 76 mm | 78% | 3.3 m/s | 2.7 |
| 2012 | 13.9°C | 10.4°C | 6.9°C | 22.7°C | 2.0°C | 70 mm | 79% | 3.8 m/s | 2.2 |
| 2011 | 14.6°C | 10.7°C | 6.8°C | 25.6°C | -0.9°C | 72 mm | 78% | 3.5 m/s | 2.4 |
| 2010 | 14.1°C | 10.0°C | 6.0°C | 22.8°C | -1.2°C | 33 mm | 73% | 3.8 m/s | 2.6 |
| 2009 | 11.9°C | 8.1°C | 4.4°C | 16.5°C | -1.9°C | 75 mm | 80% | 3.4 m/s | 2.2 |
| 2008 | 13.4°C | 9.1°C | 4.8°C | 22.3°C | -2.4°C | 56 mm | 78% | 3.4 m/s | 2.8 |
| 2007 | 17.4°C | 13.2°C | 8.9°C | 28.0°C | 1.6°C | 67 mm | 81% | 3.2 m/s | 2.5 |
| 2006 🌧️ | 12.6°C | 8.6°C | 4.6°C | 22.8°C | -0.8°C | 132 mm | 83% | 3.9 m/s | 2.4 |
| 2005 | 14.8°C | 10.9°C | 7.0°C | 25.9°C | -0.1°C | 55 mm | 81% | 3.4 m/s | 2.4 |
| 2004 | 14.4°C | 10.4°C | 6.4°C | 24.7°C | 0.9°C | 50 mm | 78% | 3.8 m/s | 2.3 |
| 2003 | 12.3°C | 8.2°C | 4.0°C | 23.2°C | -1.4°C | 64 mm | 82% | 3.2 m/s | 2.6 |
| 2002 | 12.0°C | 8.2°C | 4.5°C | 26.9°C | -3.1°C | 53 mm | 76% | 3.4 m/s | 2.5 |
| 2001 | 13.1°C | 9.1°C | 5.2°C | 22.9°C | -1.5°C | 104 mm | 82% | 3.8 m/s | 2.5 |
| 2000 | 14.8°C | 10.3°C | 5.7°C | 21.6°C | -1.1°C | 28 mm | 78% | 3 m/s | 2.7 |
| 1999 | 12.7°C | 8.5°C | 4.3°C | 20.5°C | -2.7°C | 78 mm | 77% | 3.5 m/s | 2.9 |
| 1998 | 15.0°C | 10.7°C | 6.3°C | 19.5°C | -0.3°C | 43 mm | 75% | 3.5 m/s | 3 |
| 1997 | 13.5°C | 9.2°C | 4.9°C | 24.2°C | -1.3°C | 33 mm | 76% | 3.1 m/s | 2.8 |
| 1996 | 12.7°C | 8.5°C | 4.3°C | 21.8°C | -2.8°C | 53 mm | 80% | 3.7 m/s | 2.4 |
| 1995 | 13.8°C | 9.8°C | 5.9°C | 23.3°C | -0.5°C | 117 mm | 81% | 3.9 m/s | 2.4 |
| 1994 | 14.3°C | 9.5°C | 4.8°C | 21.4°C | -0.6°C | 26 mm | 75% | 2.8 m/s | 2.9 |
| 1993 | 11.8°C | 7.2°C | 2.6°C | 21.7°C | -2.7°C | 84 mm | 79% | 3.8 m/s | 2.3 |
| 1992 | 11.3°C | 6.9°C | 2.4°C | 21.2°C | -3.6°C | 57 mm | 80% | 3.2 m/s | 2.3 |
| 1991 | 14.2°C | 9.8°C | 5.3°C | 23.4°C | -2.1°C | 46 mm | 77% | 3.3 m/s | 2.4 |
| 1990 | 12.9°C | 8.5°C | 4.2°C | 22.9°C | -3.1°C | 88 mm | 81% | 3.6 m/s | 2.4 |
| 1989 | 13.7°C | 9.2°C | 4.6°C | 21.6°C | 0.0°C | 67 mm | 79% | 3.5 m/s | 2.6 |
| 1988 | 10.4°C | 6.9°C | 3.4°C | 23.7°C | -3.5°C | 68 mm | 78% | 3.8 m/s | 2.3 |
| 1987 | 11.5°C | 7.2°C | 2.8°C | 17.5°C | -1.7°C | 39 mm | 77% | 3.3 m/s | 2.5 |
| 1986 | 12.7°C | 8.4°C | 4.1°C | 18.3°C | -2.4°C | 45 mm | 82% | 3.2 m/s | 2.6 |
| 1985 | 13.9°C | 9.6°C | 5.4°C | 18.9°C | -2.5°C | 61 mm | 76% | 3.4 m/s | 2.5 |
| 1984 | 15.4°C | 10.9°C | 6.5°C | 20.9°C | 0.7°C | 32 mm | 76% | 2.6 m/s | 2.6 |
| 1983 | 13.3°C | 9.2°C | 5.0°C | 24.8°C | -1.3°C | 96 mm | 78% | 3.8 m/s | — |
| 1982 | 14.5°C | 10.0°C | 5.5°C | 22.1°C | -1.8°C | 27 mm | 78% | 3.1 m/s | — |
| 1981 ❄️ | 10.4°C | 6.7°C | 2.9°C | 17.9°C | -2.0°C | 63 mm | 82% | 3.6 m/s | — |
Actual recorded October data for each year, 1981–2025 — sourced from NASA POWER.
The average high in October is around 13.9°C with lows near 5.6°C (mean 9.8°C), based on 45 years of NASA POWER data.
October averages 61 mm of rainfall in Oshawa, about average for rainfall. The wettest on record was 132 mm in 2006.
The hottest October reached 29.1°C in 2023. The coldest dipped to -3.6°C in 1992.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average October temperatures have risen by about 2.8°C. Daytime highs moved from 13.5°C to 16.3°C and overnight lows from 5.1°C to 7.8°C over the same span.
October is one of the warmer months of the year in Oshawa and about average for rainfall, so plan for around 13.9°C daytime highs and 5.6°C at night.
Not quite — October is the 7th coolest month in Oshawa, averaging 9.8°C.
For October in Oshawa, pack warm layers and a jacket for chilly mornings, with typical highs of 13.9°C and lows of 5.6°C. Bring an umbrella or light rain jacket too.
Relative humidity in October averages 78% — quite humid.
Average wind speed in October is 3.5 m/s. The windiest October on record averaged 4 m/s (2015).
The wettest October on record was 2006 with 132 mm. On average, October sees 61 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 Oshawa 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.
