October is one of the warmer months of the year in Mississauga, with average highs near 13.4°C and lows around 7.9°C (mean 10.7°C). It is about average for rainfall, averaging 64 mm of rainfall and 78% relative humidity across the period.
October is one of the warmer months of the year in Mississauga. Across 45 years of records, the warmest October in Mississauga was 2021 — when the month averaged 15.3°C — while the coldest was 1988 at 6.8°C. Typical October days reach 13.4°C with nights near 7.9°C. The long-term trend is warming, about 1.4°C per decade.
October is about average for rainfall in Mississauga, averaging 64 mm of rainfall. The wettest October on record was 2006 with 125 mm, while the driest was 1994 at 21 mm.
Relative humidity in Mississauga during October averages 78%. The most humid October was 1986 at 83%, and the least humid was 2024 at 71%.
October receives about 2.6 kWh/m²/day of solar energy in Mississauga. 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 Mississauga during October is 4.2 m/s. The windiest Octobers were 2015 and 2018 at 5.2 m/s, while the calmest was 1984 at 3 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 8.7°C | 9.0°C | 10.7°C | 12.4°C | 13.4°C | +4.7°C |
| Avg High | 11.7°C | 12.0°C | 13.3°C | 14.9°C | 15.9°C | +4.2°C |
| Avg Low | 5.8°C | 6.0°C | 8.1°C | 9.9°C | 10.8°C | +5°C |
| Avg Rain | 60 mm | 54 mm | 68 mm | 79 mm | 53 mm | -7 mm |
October temperatures in Mississauga have risen by about 4.3°C between 1981–1985 and 2021–2025.
October has ranged from a record low of -1.7°C (1991) to a record high of 25.9°C (2023).
Rainfall in October is about average for rainfall, averaging 64 mm, with a wettest year of 125 mm.
Daytime highs and overnight lows have shifted differently — highs rose about 1.2°C per decade while lows rose 1.5°C per decade, narrowing the gap between day and night.
A good time to visit Mississauga
October is a good time to visit Mississauga, with days averaging 13.4°C and nights around 7.9°C (mean 10.7°C, warmer than Mississauga'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 | 16.6°C | 14.1°C | 11.6°C | 24.9°C | 5.0°C | 61 mm | 72% | 4.6 m/s | 2.9 |
| 2024 | 17.0°C | 14.0°C | 11.0°C | 23.6°C | 6.2°C | 39 mm | 71% | 4.5 m/s | 3 |
| 2023 | 16.2°C | 13.8°C | 11.3°C | 25.9°C | 4.1°C | 50 mm | 75% | 4.5 m/s | 2.5 |
| 2022 | 14.6°C | 11.8°C | 8.9°C | 22.8°C | 5.1°C | 31 mm | 73% | 4 m/s | 2.9 |
| 2021 🔥 | 17.4°C | 15.3°C | 13.1°C | 23.2°C | 7.1°C | 89 mm | 82% | 4.2 m/s | 2.2 |
| 2020 | 13.9°C | 11.4°C | 8.8°C | 20.3°C | 1.4°C | 49 mm | 75% | 4.6 m/s | 2.4 |
| 2019 | 15.3°C | 12.9°C | 10.4°C | 25.3°C | 6.0°C | 99 mm | 79% | 4.7 m/s | 2.7 |
| 2018 | 13.8°C | 11.2°C | 8.5°C | 23.8°C | 2.8°C | 71 mm | 78% | 5.2 m/s | 2.1 |
| 2017 | 17.5°C | 14.7°C | 11.9°C | 23.7°C | 6.5°C | 73 mm | 76% | 4.7 m/s | 2.7 |
| 2016 | 16.1°C | 13.5°C | 11.0°C | 23.0°C | 3.7°C | 54 mm | 76% | 4.5 m/s | 2.7 |
| 2015 | 14.4°C | 12.0°C | 9.6°C | 20.6°C | 3.5°C | 74 mm | 73% | 5.2 m/s | 2.7 |
| 2014 | 14.5°C | 11.9°C | 9.3°C | 22.2°C | 3.9°C | 63 mm | 80% | 4.4 m/s | 2.4 |
| 2013 | 14.9°C | 12.6°C | 10.3°C | 22.2°C | 2.3°C | 90 mm | 79% | 4.3 m/s | 2.7 |
| 2012 | 13.3°C | 11.1°C | 8.8°C | 20.0°C | 4.9°C | 115 mm | 80% | 4.6 m/s | 2.2 |
| 2011 | 14.7°C | 12.3°C | 9.8°C | 23.6°C | 3.8°C | 93 mm | 77% | 4.5 m/s | 2.5 |
| 2010 | 14.6°C | 12.1°C | 9.5°C | 20.6°C | 3.2°C | 60 mm | 73% | 4.7 m/s | 2.7 |
| 2009 | 12.1°C | 9.7°C | 7.3°C | 16.8°C | 2.7°C | 72 mm | 79% | 4.3 m/s | 2.2 |
| 2008 | 13.9°C | 11.3°C | 8.7°C | 21.1°C | 2.1°C | 57 mm | 74% | 4.6 m/s | 2.9 |
| 2007 | 17.6°C | 15.0°C | 12.4°C | 24.7°C | 5.6°C | 56 mm | 78% | 4.1 m/s | 2.4 |
| 2006 🌧️ | 13.0°C | 10.4°C | 7.8°C | 21.5°C | 2.8°C | 125 mm | 80% | 5.1 m/s | 2.4 |
| 2005 | 14.7°C | 12.3°C | 9.9°C | 23.0°C | 4.5°C | 66 mm | 80% | 4.2 m/s | 2.5 |
| 2004 | 14.8°C | 12.4°C | 10.0°C | 23.3°C | 6.8°C | 46 mm | 77% | 4.8 m/s | 2.4 |
| 2003 | 10.6°C | 7.7°C | 4.8°C | 17.7°C | -1.0°C | 61 mm | 83% | 3.4 m/s | 2.6 |
| 2002 | 10.5°C | 7.8°C | 5.1°C | 20.0°C | -0.4°C | 54 mm | 80% | 3.6 m/s | 2.5 |
| 2001 | 11.4°C | 8.5°C | 5.6°C | 18.6°C | 0.5°C | 107 mm | 83% | 4.1 m/s | 2.4 |
| 2000 | 14.5°C | 11.7°C | 9.0°C | 19.4°C | 3.4°C | 33 mm | 78% | 3.8 m/s | 2.7 |
| 1999 | 11.5°C | 8.6°C | 5.6°C | 16.9°C | 1.0°C | 74 mm | 78% | 3.8 m/s | 2.7 |
| 1998 | 15.5°C | 12.7°C | 10.0°C | 19.7°C | 5.3°C | 39 mm | 73% | 4.6 m/s | 3 |
| 1997 | 13.9°C | 11.2°C | 8.6°C | 22.9°C | 2.6°C | 30 mm | 73% | 4 m/s | 3 |
| 1996 | 11.2°C | 8.2°C | 5.1°C | 18.2°C | -0.4°C | 44 mm | 82% | 4 m/s | 2.3 |
| 1995 | 12.2°C | 9.3°C | 6.4°C | 19.3°C | 2.1°C | 77 mm | 82% | 4.3 m/s | 2.5 |
| 1994 | 12.3°C | 9.0°C | 5.7°C | 16.9°C | 2.5°C | 21 mm | 78% | 3.1 m/s | 2.9 |
| 1993 | 10.4°C | 6.9°C | 3.4°C | 17.5°C | -1.1°C | 69 mm | 79% | 4.1 m/s | 2.4 |
| 1992 | 10.2°C | 7.1°C | 4.0°C | 17.5°C | -1.2°C | 65 mm | 81% | 3.6 m/s | 2.5 |
| 1991 | 12.0°C | 8.9°C | 5.8°C | 18.7°C | -1.7°C | 46 mm | 80% | 3.6 m/s | 2.6 |
| 1990 | 11.2°C | 8.1°C | 5.1°C | 17.8°C | -1.4°C | 78 mm | 82% | 4 m/s | 2.6 |
| 1989 | 12.1°C | 8.7°C | 5.3°C | 17.4°C | 0.9°C | 55 mm | 81% | 3.8 m/s | 2.5 |
| 1988 ❄️ | 9.4°C | 6.8°C | 4.1°C | 18.3°C | -0.8°C | 73 mm | 80% | 4.1 m/s | 2.5 |
| 1987 | 10.1°C | 6.9°C | 3.7°C | 15.0°C | -0.6°C | 57 mm | 78% | 3.6 m/s | 2.6 |
| 1986 | 11.5°C | 8.6°C | 5.7°C | 16.5°C | 0.3°C | 65 mm | 83% | 3.6 m/s | 2.7 |
| 1985 | 12.7°C | 9.9°C | 7.1°C | 16.4°C | 1.0°C | 78 mm | 78% | 3.8 m/s | 2.7 |
| 1984 | 13.8°C | 10.7°C | 7.6°C | 17.8°C | 4.1°C | 28 mm | 79% | 3 m/s | 2.9 |
| 1983 | 12.4°C | 9.6°C | 6.9°C | 19.4°C | 1.0°C | 75 mm | 78% | 4.3 m/s | — |
| 1982 | 12.9°C | 9.8°C | 6.7°C | 20.4°C | 0.7°C | 42 mm | 80% | 3.4 m/s | — |
| 1981 | 10.3°C | 7.7°C | 5.1°C | 16.3°C | 0.3°C | 72 mm | 81% | 4.2 m/s | — |
Actual recorded October data for each year, 1981–2025 — sourced from NASA POWER.
The average high in October is around 13.4°C with lows near 7.9°C (mean 10.7°C), based on 45 years of NASA POWER data.
October averages 64 mm of rainfall in Mississauga, about average for rainfall. The wettest on record was 125 mm in 2006.
The hottest October reached 25.9°C in 2023. The coldest dipped to -1.7°C in 1991.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average October temperatures have risen by about 4.3°C. Daytime highs moved from 12.4°C to 16.4°C and overnight lows from 6.7°C to 11.2°C over the same span.
October is one of the warmer months of the year in Mississauga and about average for rainfall, so plan for around 13.4°C daytime highs and 7.9°C at night.
Not quite — October is the 7th coolest month in Mississauga, averaging 10.7°C.
For October in Mississauga, pack warm layers and a jacket for chilly mornings, with typical highs of 13.4°C and lows of 7.9°C. Bring an umbrella or light rain jacket too.
Relative humidity in October averages 78% — quite humid.
Average wind speed in October is 4.2 m/s. The windiest October on record averaged 5.2 m/s (2015).
The wettest October on record was 2006 with 125 mm. On average, October sees 64 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 Mississauga 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.
