September is one of the warmer months of the year in Côte-Saint-Luc, with average highs near 21.7°C and lows around 10.8°C (mean 16.3°C). It is about average for rainfall, averaging 84 mm of rainfall and 74% relative humidity across the period.
September is one of the warmer months of the year in Côte-Saint-Luc. Across 45 years of records, the warmest September in Côte-Saint-Luc was 2015 — when the month averaged 19.2°C — while the coldest was 1986 at 13.2°C. Typical September days reach 21.7°C with nights near 10.8°C. The long-term trend is warming, about 0.7°C per decade.
September is about average for rainfall in Côte-Saint-Luc, averaging 84 mm of rainfall. The wettest September on record was 2010 with 168 mm, while the driest was 2023 at 27 mm.
Relative humidity in Côte-Saint-Luc during September averages 74%. The most humid September was 2011 at 81%, and the least humid was 1995 at 66%.
September receives about 3.9 kWh/m²/day of solar energy in Côte-Saint-Luc. The sunniest Septembers were 2016 and 2025 at 4.5 kWh/m²/day, and the cloudiest was 1990 at 3.2.
Average wind speed in Côte-Saint-Luc during September is 2.6 m/s. The windiest Septembers were 1981 and 1997 at 3.1 m/s, while the calmest was 2023 at 2.1 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 15.0°C | 15.5°C | 16.6°C | 17.1°C | 17.3°C | +2.3°C |
| Avg High | 20.4°C | 20.9°C | 22.3°C | 22.5°C | 22.9°C | +2.5°C |
| Avg Low | 9.7°C | 10.0°C | 11.0°C | 11.7°C | 11.8°C | +2.1°C |
| Avg Rain | 88 mm | 86 mm | 85 mm | 94 mm | 58 mm | -31 mm |
September temperatures in Côte-Saint-Luc have risen by about 2.4°C between 1981–1985 and 2021–2025.
September has ranged from a record low of -1.6°C (1991) to a record high of 34.2°C (2002).
Rainfall in September is about average for rainfall, averaging 84 mm, with a wettest year of 168 mm.
One of the best times to visit Côte-Saint-Luc
September is one of the best times to visit Côte-Saint-Luc. Expect days averaging 21.7°C and nights around 10.8°C (mean 16.3°C) — warmer than Côte-Saint-Luc's yearly average — with higher rainfall (84 mm), so conditions are generally comfortable for sightseeing and outdoor plans.
| Year | Avg High | Avg Temp | Avg Low | Hottest Day | Coldest Day | Rainfall | Humidity | Wind | Solar |
|---|---|---|---|---|---|---|---|---|---|
| 2025 | 24.0°C | 17.9°C | 11.9°C | 29.6°C | 4.4°C | 42 mm | 67% | 2.2 m/s | 4.5 |
| 2024 | 23.8°C | 18.2°C | 12.7°C | 28.8°C | 6.6°C | 49 mm | 76% | 2.5 m/s | 4.2 |
| 2023 | 24.2°C | 18.5°C | 12.8°C | 32.7°C | 6.9°C | 27 mm | 73% | 2.1 m/s | 4 |
| 2022 | 21.4°C | 16.0°C | 10.6°C | 29.7°C | 4.9°C | 97 mm | 75% | 2.4 m/s | 3.7 |
| 2021 | 23.2°C | 17.9°C | 12.5°C | 28.2°C | 5.8°C | 70 mm | 71% | 2.6 m/s | 3.7 |
| 2020 | 21.0°C | 15.6°C | 10.2°C | 28.0°C | 2.7°C | 62 mm | 72% | 2.7 m/s | 3.6 |
| 2019 | 21.7°C | 16.1°C | 10.5°C | 28.5°C | 4.6°C | 100 mm | 75% | 2.5 m/s | 3.8 |
| 2018 | 23.2°C | 17.9°C | 12.6°C | 32.7°C | 3.3°C | 107 mm | 75% | 2.6 m/s | 3.9 |
| 2017 | 23.7°C | 18.3°C | 12.9°C | 32.0°C | 6.2°C | 50 mm | 77% | 2.2 m/s | 4.2 |
| 2016 | 23.7°C | 18.0°C | 12.2°C | 31.1°C | 4.5°C | 37 mm | 72% | 2.5 m/s | 4.5 |
| 2015 🔥 | 25.0°C | 19.2°C | 13.5°C | 32.6°C | 5.1°C | 102 mm | 73% | 2.5 m/s | 4.3 |
| 2014 | 21.9°C | 16.2°C | 10.4°C | 29.7°C | 0.7°C | 52 mm | 75% | 2.8 m/s | 3.8 |
| 2013 | 20.2°C | 15.0°C | 9.8°C | 29.1°C | 3.9°C | 106 mm | 77% | 2.5 m/s | 3.8 |
| 2012 | 21.7°C | 16.2°C | 10.7°C | 28.3°C | 4.1°C | 108 mm | 73% | 2.8 m/s | 3.9 |
| 2011 | 22.2°C | 17.4°C | 12.6°C | 28.3°C | 4.8°C | 112 mm | 81% | 2.3 m/s | 3.7 |
| 2010 🌧️ | 21.5°C | 16.7°C | 11.9°C | 33.7°C | 6.2°C | 168 mm | 77% | 3 m/s | 3.3 |
| 2009 | 21.6°C | 15.6°C | 9.7°C | 27.0°C | 3.8°C | 56 mm | 73% | 2.6 m/s | 4.3 |
| 2008 | 22.4°C | 16.8°C | 11.1°C | 31.6°C | 3.5°C | 59 mm | 76% | 2.2 m/s | 3.7 |
| 2007 | 23.3°C | 17.2°C | 11.2°C | 32.7°C | 4.3°C | 74 mm | 72% | 2.8 m/s | 4.4 |
| 2006 | 20.1°C | 14.9°C | 9.8°C | 25.8°C | 4.5°C | 78 mm | 80% | 2.7 m/s | 3.4 |
| 2005 | 22.5°C | 17.2°C | 11.9°C | 29.9°C | 4.3°C | 131 mm | 78% | 2.8 m/s | 4 |
| 2004 | 22.1°C | 16.6°C | 11.1°C | 27.5°C | 5.5°C | 90 mm | 78% | 2.5 m/s | 4.2 |
| 2003 | 23.4°C | 17.8°C | 12.3°C | 29.8°C | 6.7°C | 100 mm | 73% | 2.8 m/s | 4 |
| 2002 | 24.8°C | 18.6°C | 12.4°C | 34.2°C | 5.0°C | 99 mm | 68% | 2.7 m/s | 4.2 |
| 2001 | 22.7°C | 17.0°C | 11.4°C | 32.2°C | 4.8°C | 69 mm | 71% | 2.6 m/s | 4.1 |
| 2000 | 20.0°C | 14.6°C | 9.2°C | 29.3°C | -0.6°C | 94 mm | 76% | 2.8 m/s | 3.7 |
| 1999 | 23.5°C | 18.2°C | 12.9°C | 33.9°C | 5.3°C | 155 mm | 74% | 2.6 m/s | 3.6 |
| 1998 | 22.0°C | 16.6°C | 11.1°C | 27.6°C | 4.0°C | 60 mm | 74% | 2.7 m/s | 3.8 |
| 1997 | 20.7°C | 15.3°C | 9.8°C | 26.9°C | 2.0°C | 68 mm | 74% | 3.1 m/s | 3.3 |
| 1996 | 22.3°C | 17.2°C | 12.1°C | 30.0°C | 5.1°C | 79 mm | 74% | 2.9 m/s | 3.7 |
| 1995 | 20.3°C | 14.2°C | 8.0°C | 27.5°C | 3.4°C | 52 mm | 66% | 2.6 m/s | 4 |
| 1994 | 20.7°C | 15.4°C | 10.0°C | 25.8°C | 5.8°C | 78 mm | 76% | 2.9 m/s | 3.6 |
| 1993 | 19.4°C | 14.2°C | 9.0°C | 28.8°C | 0.4°C | 116 mm | 75% | 2.8 m/s | 3.5 |
| 1992 | 20.2°C | 15.0°C | 9.7°C | 28.4°C | 0.9°C | 94 mm | 76% | 2.9 m/s | 3.6 |
| 1991 | 19.3°C | 13.9°C | 8.5°C | 27.3°C | -1.6°C | 77 mm | 71% | 2.6 m/s | 3.8 |
| 1990 | 20.1°C | 14.6°C | 9.1°C | 27.9°C | 4.0°C | 80 mm | 75% | 2.7 m/s | 3.2 |
| 1989 | 21.3°C | 15.8°C | 10.3°C | 29.7°C | 0.8°C | 88 mm | 75% | 2.6 m/s | 3.7 |
| 1988 | 20.3°C | 14.6°C | 8.8°C | 28.2°C | 1.7°C | 60 mm | 73% | 2.9 m/s | 3.8 |
| 1987 | 20.0°C | 15.1°C | 10.1°C | 27.0°C | 0.5°C | 119 mm | 78% | 2.8 m/s | 3.6 |
| 1986 ❄️ | 18.3°C | 13.2°C | 8.1°C | 23.8°C | 1.9°C | 128 mm | 80% | 2.5 m/s | 3.4 |
| 1985 | 22.0°C | 16.2°C | 10.5°C | 28.1°C | 4.3°C | 77 mm | 73% | 2.6 m/s | 4 |
| 1984 | 19.9°C | 14.1°C | 8.3°C | 26.8°C | 2.1°C | 33 mm | 72% | 2.7 m/s | 4.2 |
| 1983 | 23.3°C | 17.4°C | 11.6°C | 32.0°C | 5.1°C | 72 mm | 68% | 2.8 m/s | — |
| 1982 | 19.8°C | 14.7°C | 9.6°C | 28.7°C | 4.2°C | 100 mm | 80% | 2.6 m/s | — |
| 1981 | 19.0°C | 14.3°C | 9.6°C | 26.0°C | 0.9°C | 119 mm | 79% | 3.1 m/s | — |
Actual recorded September data for each year, 1981–2025 — sourced from NASA POWER.
The average high in September is around 21.7°C with lows near 10.8°C (mean 16.3°C), based on 45 years of NASA POWER data.
September averages 84 mm of rainfall in Côte-Saint-Luc, about average for rainfall. The wettest on record was 168 mm in 2010.
The hottest September reached 34.2°C in 2002. The coldest dipped to -1.6°C in 1991.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average September temperatures have risen by about 2.4°C. Daytime highs moved from 20.8°C to 23.3°C and overnight lows from 9.9°C to 12.1°C over the same span.
September is one of the warmer months of the year in Côte-Saint-Luc and about average for rainfall, so plan for around 21.7°C daytime highs and 10.8°C at night.
Not quite — September is the 9th coolest month in Côte-Saint-Luc, averaging 16.3°C.
For September in Côte-Saint-Luc, pack light layers you can adjust through the day, with typical highs of 21.7°C and lows of 10.8°C. Bring an umbrella or light rain jacket too.
Relative humidity in September averages 74% — moderately humid.
Average wind speed in September is 2.6 m/s. The windiest September on record averaged 3.1 m/s (1981).
The wettest September on record was 2010 with 168 mm. On average, September sees 84 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 Côte-Saint-Luc behaves each September, 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 September specifically, along with year-by-year records and how the month has changed over the decades.
