September is one of the warmer months of the year in Sherbrooke, with average highs near 19.1°C and lows around 8.7°C (mean 13.9°C). It is about average for rainfall, averaging 98 mm of rainfall and 82% relative humidity across the period.
September is one of the warmer months of the year in Sherbrooke. Across 45 years of records, the warmest September in Sherbrooke was 2015 — when the month averaged 16.7°C — while the coldest was 1991 at 11.3°C. Typical September days reach 19.1°C with nights near 8.7°C. The long-term trend is warming, about 0.7°C per decade.
September is about average for rainfall in Sherbrooke, averaging 98 mm of rainfall. The wettest September on record was 1999 with 207 mm, while the driest was 2009 at 46 mm.
Relative humidity in Sherbrooke during September averages 82%. The most humid September was 2010 at 86%, and the least humid was 2020 at 78%.
September receives about 3.8 kWh/m²/day of solar energy in Sherbrooke. The sunniest Septembers were 2015, 2016 and 2025, among others at 4.3 kWh/m²/day, and the cloudiest was 2010 at 3.1.
Average wind speed in Sherbrooke during September is 0.1 m/s. The windiest Septembers were 2023, 2024 and 2025, among others at 0.1 m/s, while the calmest were 2023, 2024 and 2025, among others at 0.1 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 12.8°C | 13.1°C | 14.3°C | 14.8°C | 15.0°C | +2.2°C |
| Avg High | 17.9°C | 18.2°C | 19.6°C | 20.1°C | 20.2°C | +2.3°C |
| Avg Low | 7.6°C | 8.0°C | 8.9°C | 9.6°C | 9.7°C | +2.1°C |
| Avg Rain | 95 mm | 110 mm | 85 mm | 106 mm | 91 mm | -4 mm |
September temperatures in Sherbrooke have risen by about 2.2°C between 1981–1985 and 2021–2025.
September has ranged from a record low of -2.3°C (2014) to a record high of 29.5°C (1999).
Rainfall in September is about average for rainfall, averaging 98 mm, with a wettest year of 207 mm.
One of the best times to visit Sherbrooke
September is one of the best times to visit Sherbrooke. Expect days averaging 19.1°C and nights around 8.7°C (mean 13.9°C) — warmer than Sherbrooke's yearly average — with higher rainfall (98 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 | 20.4°C | 14.8°C | 9.2°C | 24.9°C | 1.1°C | 111 mm | 80% | 0.1 m/s | 4.3 |
| 2024 | 21.3°C | 16.0°C | 10.7°C | 25.9°C | 6.2°C | 50 mm | 82% | 0.1 m/s | 4.2 |
| 2023 | 21.4°C | 16.2°C | 11.0°C | 29.0°C | 4.5°C | 99 mm | 84% | 0.1 m/s | 3.7 |
| 2022 | 18.8°C | 13.9°C | 9.0°C | 26.2°C | 1.2°C | 135 mm | 83% | 0.1 m/s | 3.4 |
| 2021 | 20.3°C | 15.3°C | 10.3°C | 25.7°C | 6.5°C | 100 mm | 81% | 0.1 m/s | 3.6 |
| 2020 | 19.1°C | 13.7°C | 8.2°C | 24.6°C | -0.4°C | 50 mm | 78% | 0.1 m/s | 3.9 |
| 2019 | 18.9°C | 13.6°C | 8.4°C | 25.4°C | 0.6°C | 106 mm | 83% | 0.1 m/s | 3.6 |
| 2018 | 20.9°C | 15.6°C | 10.4°C | 28.0°C | 0.9°C | 92 mm | 81% | 0.1 m/s | 3.9 |
| 2017 | 21.5°C | 16.3°C | 11.0°C | 28.7°C | 3.5°C | 69 mm | 83% | 0.1 m/s | 4.1 |
| 2016 | 20.8°C | 15.4°C | 10.0°C | 26.8°C | 1.6°C | 52 mm | 81% | 0.1 m/s | 4.3 |
| 2015 🔥 | 22.1°C | 16.7°C | 11.2°C | 28.0°C | 2.0°C | 117 mm | 81% | 0.1 m/s | 4.3 |
| 2014 | 19.6°C | 14.0°C | 8.5°C | 27.0°C | -2.3°C | 63 mm | 82% | 0.1 m/s | 3.9 |
| 2013 | 18.0°C | 12.9°C | 7.7°C | 28.5°C | 1.2°C | 123 mm | 83% | 0.1 m/s | 3.7 |
| 2012 | 19.1°C | 13.6°C | 8.2°C | 25.4°C | 2.5°C | 125 mm | 81% | 0.1 m/s | 4.1 |
| 2011 | 20.7°C | 15.7°C | 10.8°C | 27.3°C | 2.2°C | 150 mm | 85% | 0.1 m/s | 3.6 |
| 2010 | 19.0°C | 14.6°C | 10.1°C | 28.8°C | 4.3°C | 159 mm | 86% | 0.1 m/s | 3.1 |
| 2009 | 18.6°C | 13.1°C | 7.6°C | 23.5°C | 0.9°C | 46 mm | 82% | 0.1 m/s | 4.3 |
| 2008 | 19.8°C | 14.5°C | 9.2°C | 27.4°C | 1.0°C | 65 mm | 84% | 0.1 m/s | 3.6 |
| 2007 | 19.8°C | 14.4°C | 9.1°C | 27.5°C | 2.6°C | 87 mm | 82% | 0.1 m/s | 4.2 |
| 2006 | 18.5°C | 13.4°C | 8.2°C | 23.3°C | 2.9°C | 78 mm | 84% | 0.1 m/s | 3.6 |
| 2005 | 20.3°C | 15.2°C | 10.0°C | 26.8°C | 2.4°C | 119 mm | 84% | 0.1 m/s | 3.8 |
| 2004 | 19.9°C | 14.3°C | 8.7°C | 24.6°C | 3.5°C | 70 mm | 82% | 0.1 m/s | 4.2 |
| 2003 | 20.6°C | 15.2°C | 9.8°C | 26.8°C | 4.6°C | 73 mm | 83% | 0.1 m/s | 4 |
| 2002 | 21.1°C | 15.5°C | 9.9°C | 27.8°C | 2.3°C | 129 mm | 81% | 0.1 m/s | 4 |
| 2001 | 19.4°C | 14.3°C | 9.2°C | 27.8°C | 1.0°C | 60 mm | 81% | 0.1 m/s | 3.9 |
| 2000 | 17.8°C | 12.7°C | 7.6°C | 26.5°C | -0.4°C | 121 mm | 82% | 0.1 m/s | 3.6 |
| 1999 🌧️ | 20.9°C | 16.0°C | 11.1°C | 29.5°C | 4.5°C | 207 mm | 83% | 0.1 m/s | 3.9 |
| 1998 | 19.3°C | 14.1°C | 8.9°C | 25.2°C | 1.5°C | 87 mm | 83% | 0.1 m/s | 3.7 |
| 1997 | 18.3°C | 13.0°C | 7.8°C | 24.2°C | 0.5°C | 56 mm | 83% | 0.1 m/s | 3.3 |
| 1996 | 19.2°C | 14.4°C | 9.5°C | 26.4°C | 2.2°C | 77 mm | 83% | 0.1 m/s | 3.5 |
| 1995 | 17.2°C | 11.5°C | 5.7°C | 23.4°C | -1.1°C | 95 mm | 78% | 0.1 m/s | 4 |
| 1994 | 17.6°C | 13.0°C | 8.4°C | 22.6°C | 4.6°C | 88 mm | 85% | 0.1 m/s | 3.3 |
| 1993 | 17.3°C | 12.3°C | 7.3°C | 25.6°C | -0.2°C | 131 mm | 81% | 0.1 m/s | 3.5 |
| 1992 | 18.3°C | 13.1°C | 7.9°C | 25.8°C | -1.2°C | 125 mm | 82% | 0.1 m/s | 3.7 |
| 1991 ❄️ | 16.3°C | 11.3°C | 6.3°C | 25.1°C | -0.4°C | 119 mm | 81% | 0.1 m/s | 3.7 |
| 1990 | 17.1°C | 12.2°C | 7.2°C | 23.4°C | 0.7°C | 113 mm | 84% | 0.1 m/s | 3.3 |
| 1989 | 18.8°C | 13.6°C | 8.4°C | 28.2°C | -0.5°C | 108 mm | 82% | 0.1 m/s | 3.7 |
| 1988 | 17.3°C | 11.9°C | 6.6°C | 24.7°C | 1.0°C | 68 mm | 81% | 0.1 m/s | 3.6 |
| 1987 | 17.5°C | 12.6°C | 7.6°C | 28.3°C | -0.7°C | 113 mm | 84% | 0.1 m/s | 3.3 |
| 1986 | 16.8°C | 11.6°C | 6.4°C | 22.3°C | 0.6°C | 136 mm | 83% | 0.1 m/s | 3.2 |
| 1985 | 19.0°C | 13.6°C | 8.2°C | 24.7°C | 2.4°C | 85 mm | 82% | 0.1 m/s | 3.9 |
| 1984 | 16.8°C | 11.5°C | 6.2°C | 23.8°C | -0.9°C | 56 mm | 80% | 0.1 m/s | 3.9 |
| 1983 | 19.6°C | 14.2°C | 8.8°C | 26.6°C | 2.7°C | 69 mm | 80% | 0.1 m/s | — |
| 1982 | 18.3°C | 13.4°C | 8.5°C | 24.9°C | 3.4°C | 87 mm | 85% | 0.1 m/s | — |
| 1981 | 17.1°C | 12.4°C | 7.7°C | 24.7°C | 0.0°C | 129 mm | 84% | 0.1 m/s | — |
Actual recorded September data for each year, 1981–2025 — sourced from NASA POWER.
The average high in September is around 19.1°C with lows near 8.7°C (mean 13.9°C), based on 45 years of NASA POWER data.
September averages 98 mm of rainfall in Sherbrooke, about average for rainfall. The wettest on record was 207 mm in 1999.
The hottest September reached 29.5°C in 1999. The coldest dipped to -2.3°C in 2014.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average September temperatures have risen by about 2.2°C. Daytime highs moved from 18.2°C to 20.4°C and overnight lows from 7.9°C to 10°C over the same span.
September is one of the warmer months of the year in Sherbrooke and about average for rainfall, so plan for around 19.1°C daytime highs and 8.7°C at night.
Not quite — September is the 9th coolest month in Sherbrooke, averaging 13.9°C.
For September in Sherbrooke, pack light layers you can adjust through the day, with typical highs of 19.1°C and lows of 8.7°C. Bring an umbrella or light rain jacket too.
Relative humidity in September averages 82% — quite humid.
Average wind speed in September is 0.1 m/s. The windiest September on record averaged 0.1 m/s (1981).
The wettest September on record was 1999 with 207 mm. On average, September sees 98 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 Sherbrooke 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.
