September is one of the warmer months of the year in Quebec City, with average highs near 17.1°C and lows around 7.8°C (mean 12.5°C). It is about average for rainfall, averaging 107 mm of rainfall and 84% relative humidity across the period.
September is one of the warmer months of the year in Quebec City. Across 45 years of records, the warmest September in Quebec City was 2023 — when the month averaged 15.6°C — while the coldest was 1991 at 9.7°C. Typical September days reach 17.1°C with nights near 7.8°C. The long-term trend is warming, about 0.7°C per decade.
September is about average for rainfall in Quebec City, averaging 107 mm of rainfall. The wettest September on record was 2010 with 211 mm, while the driest was 2025 at 41 mm.
Relative humidity in Quebec City during September averages 84%. The most humid September was 1987 at 88%, and the least humid was 1995 at 79%.
September receives about 3.7 kWh/m²/day of solar energy in Quebec City. The sunniest September was 2025 at 4.4 kWh/m²/day, and the cloudiest was 2010 at 3.
Average wind speed in Quebec City during September is 1.1 m/s. The windiest Septembers were 1988 and 2005 at 1.3 m/s, while the calmest was 2023 at 0.9 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 11.2°C | 11.6°C | 12.7°C | 13.4°C | 13.7°C | +2.5°C |
| Avg High | 15.9°C | 16.2°C | 17.6°C | 18.0°C | 18.5°C | +2.6°C |
| Avg Low | 6.7°C | 6.9°C | 7.9°C | 8.8°C | 9.0°C | +2.3°C |
| Avg Rain | 116 mm | 111 mm | 101 mm | 117 mm | 78 mm | -37 mm |
September temperatures in Quebec City have risen by about 2.5°C between 1981–1985 and 2021–2025.
September has ranged from a record low of -3°C (2000) to a record high of 28.4°C (2023).
Rainfall in September is about average for rainfall, averaging 107 mm, with a wettest year of 211 mm.
One of the best times to visit Quebec City
September is one of the best times to visit Quebec City. Expect days averaging 17.1°C and nights around 7.8°C (mean 12.5°C) — warmer than Quebec City's yearly average — with higher rainfall (107 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 | 18.7°C | 13.6°C | 8.5°C | 23.2°C | 1.2°C | 41 mm | 80% | 1 m/s | 4.4 |
| 2024 | 19.4°C | 14.7°C | 10.1°C | 24.5°C | 4.7°C | 60 mm | 85% | 1.1 m/s | 4.1 |
| 2023 🔥 | 20.4°C | 15.6°C | 10.8°C | 28.4°C | 4.1°C | 68 mm | 84% | 0.9 m/s | 3.7 |
| 2022 | 17.6°C | 12.9°C | 8.1°C | 24.5°C | 1.9°C | 65 mm | 81% | 1 m/s | 3.8 |
| 2021 | 18.2°C | 13.7°C | 9.2°C | 22.3°C | 4.5°C | 115 mm | 85% | 1.1 m/s | 3.5 |
| 2020 | 16.4°C | 11.7°C | 7.0°C | 21.6°C | -0.2°C | 119 mm | 83% | 1.2 m/s | 3.6 |
| 2019 | 16.3°C | 11.9°C | 7.5°C | 21.6°C | 1.8°C | 143 mm | 85% | 1.1 m/s | 3.5 |
| 2018 | 18.1°C | 13.4°C | 8.7°C | 25.2°C | -1.6°C | 106 mm | 84% | 1.1 m/s | 3.8 |
| 2017 | 19.7°C | 15.2°C | 10.8°C | 26.7°C | 3.9°C | 85 mm | 85% | 1 m/s | 3.9 |
| 2016 | 18.4°C | 13.9°C | 9.3°C | 25.0°C | 2.5°C | 119 mm | 84% | 1.1 m/s | 4.1 |
| 2015 | 20.0°C | 15.1°C | 10.2°C | 25.2°C | 2.2°C | 101 mm | 84% | 1 m/s | 4.2 |
| 2014 | 16.9°C | 12.2°C | 7.5°C | 23.9°C | -1.9°C | 110 mm | 86% | 1.2 m/s | 3.6 |
| 2013 | 16.6°C | 12.1°C | 7.6°C | 22.8°C | 1.8°C | 93 mm | 83% | 1.1 m/s | 3.6 |
| 2012 | 17.5°C | 12.7°C | 7.9°C | 23.9°C | 3.4°C | 92 mm | 83% | 1.2 m/s | 3.9 |
| 2011 | 18.9°C | 14.3°C | 9.8°C | 23.8°C | 3.5°C | 114 mm | 86% | 1 m/s | 3.6 |
| 2010 🌧️ | 17.2°C | 13.1°C | 9.1°C | 27.7°C | 3.7°C | 211 mm | 86% | 1.2 m/s | 3 |
| 2009 | 17.1°C | 12.1°C | 7.0°C | 21.6°C | -0.5°C | 74 mm | 83% | 1.1 m/s | 4.2 |
| 2008 | 17.9°C | 13.1°C | 8.3°C | 26.4°C | 1.2°C | 104 mm | 85% | 1 m/s | 3.5 |
| 2007 | 17.5°C | 12.5°C | 7.6°C | 25.7°C | 2.2°C | 118 mm | 82% | 1.2 m/s | 4 |
| 2006 | 16.7°C | 11.9°C | 7.1°C | 21.9°C | 1.8°C | 92 mm | 83% | 1 m/s | 3.4 |
| 2005 | 18.3°C | 13.4°C | 8.4°C | 24.9°C | 3.0°C | 149 mm | 84% | 1.3 m/s | 3.6 |
| 2004 | 17.7°C | 12.6°C | 7.5°C | 21.8°C | 4.0°C | 110 mm | 83% | 1.1 m/s | 4 |
| 2003 | 18.9°C | 14.1°C | 9.4°C | 24.9°C | 4.9°C | 73 mm | 82% | 1 m/s | 3.9 |
| 2002 | 19.0°C | 13.9°C | 8.8°C | 27.4°C | 2.2°C | 92 mm | 81% | 1.1 m/s | 4.1 |
| 2001 | 17.4°C | 13.0°C | 8.6°C | 25.5°C | 2.7°C | 74 mm | 84% | 1.1 m/s | 3.9 |
| 2000 | 15.1°C | 10.6°C | 6.1°C | 21.8°C | -3.0°C | 120 mm | 85% | 1.2 m/s | 3.4 |
| 1999 | 19.2°C | 14.8°C | 10.4°C | 27.8°C | 4.2°C | 168 mm | 85% | 1.1 m/s | 3.6 |
| 1998 | 17.0°C | 12.5°C | 7.9°C | 22.1°C | 0.2°C | 143 mm | 84% | 1.1 m/s | 3.5 |
| 1997 | 16.3°C | 11.7°C | 7.2°C | 22.4°C | 0.1°C | 78 mm | 85% | 1.2 m/s | 3.1 |
| 1996 | 16.8°C | 12.4°C | 7.9°C | 24.1°C | 0.8°C | 122 mm | 85% | 1.1 m/s | 3.6 |
| 1995 | 15.1°C | 9.9°C | 4.7°C | 21.0°C | -0.3°C | 101 mm | 79% | 1.1 m/s | 3.8 |
| 1994 | 16.0°C | 11.4°C | 6.8°C | 19.6°C | 3.0°C | 79 mm | 85% | 1 m/s | 3.3 |
| 1993 | 15.5°C | 10.9°C | 6.2°C | 22.8°C | -0.7°C | 127 mm | 82% | 1.2 m/s | 3.4 |
| 1992 | 16.6°C | 11.8°C | 7.0°C | 23.3°C | -1.5°C | 119 mm | 83% | 1.2 m/s | 3.6 |
| 1991 ❄️ | 14.5°C | 9.7°C | 4.8°C | 20.4°C | -2.6°C | 61 mm | 81% | 1.1 m/s | 3.7 |
| 1990 | 15.5°C | 10.8°C | 6.2°C | 21.8°C | 0.4°C | 110 mm | 82% | 1.1 m/s | 3.2 |
| 1989 | 16.9°C | 12.1°C | 7.2°C | 25.3°C | -1.8°C | 79 mm | 84% | 1.1 m/s | 3.7 |
| 1988 | 14.9°C | 10.4°C | 5.9°C | 22.0°C | 0.2°C | 107 mm | 85% | 1.3 m/s | 3.5 |
| 1987 | 15.2°C | 11.0°C | 6.9°C | 22.9°C | -0.8°C | 134 mm | 88% | 1.2 m/s | 3.3 |
| 1986 | 14.7°C | 9.9°C | 5.2°C | 21.1°C | 0.3°C | 176 mm | 84% | 1.1 m/s | 3.4 |
| 1985 | 17.1°C | 12.2°C | 7.3°C | 23.5°C | 2.1°C | 127 mm | 83% | 1 m/s | 4 |
| 1984 | 14.6°C | 9.8°C | 5.0°C | 20.0°C | -0.6°C | 63 mm | 83% | 1.2 m/s | 3.7 |
| 1983 | 17.4°C | 12.7°C | 8.0°C | 25.2°C | 1.5°C | 92 mm | 84% | 1.1 m/s | — |
| 1982 | 16.3°C | 11.8°C | 7.3°C | 23.2°C | 1.6°C | 113 mm | 86% | 1 m/s | — |
| 1981 | 15.6°C | 11.3°C | 7.1°C | 22.8°C | 0.6°C | 149 mm | 85% | 1.2 m/s | — |
Actual recorded September data for each year, 1981–2025 — sourced from NASA POWER.
The average high in September is around 17.1°C with lows near 7.8°C (mean 12.5°C), based on 45 years of NASA POWER data.
September averages 107 mm of rainfall in Quebec City, about average for rainfall. The wettest on record was 211 mm in 2010.
The hottest September reached 28.4°C in 2023. The coldest dipped to -3°C in 2000.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average September temperatures have risen by about 2.5°C. Daytime highs moved from 16.2°C to 18.9°C and overnight lows from 6.9°C to 9.3°C over the same span.
September is one of the warmer months of the year in Quebec City and about average for rainfall, so plan for around 17.1°C daytime highs and 7.8°C at night.
Not quite — September is the 9th coolest month in Quebec City, averaging 12.5°C.
For September in Quebec City, pack warm layers and a jacket for chilly mornings, with typical highs of 17.1°C and lows of 7.8°C. Bring an umbrella or light rain jacket too.
Relative humidity in September averages 84% — quite humid.
Average wind speed in September is 1.1 m/s. The windiest September on record averaged 1.3 m/s (1988).
The wettest September on record was 2010 with 211 mm. On average, September sees 107 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 Quebec City 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.
