September is one of the warmer months of the year in Rouyn-Noranda, with average highs near 17.7°C and lows around 7.2°C (mean 12.5°C). It is a relatively wet time of year, averaging 89 mm of rainfall and 80% relative humidity across the period.
September is one of the warmer months of the year in Rouyn-Noranda. Across 45 years of records, the warmest September in Rouyn-Noranda was 2024 — when the month averaged 16.1°C — while the coldest was 1993 at 9.3°C. Typical September days reach 17.7°C with nights near 7.2°C. The long-term trend is warming, about 0.7°C per decade.
September is a relatively wet time of year in Rouyn-Noranda, averaging 89 mm of rainfall. The wettest September on record was 2010 with 195 mm, while the driest was 2025 at 28 mm.
Relative humidity in Rouyn-Noranda during September averages 80%. The most humid September was 2003 at 85%, and the least humid was 2007 at 73%.
September receives about 3.4 kWh/m²/day of solar energy in Rouyn-Noranda. The sunniest September was 1984 at 4 kWh/m²/day, and the cloudiest was 2010 at 2.7.
Average wind speed in Rouyn-Noranda during September is 0.2 m/s. The windiest Septembers were 2023, 2024 and 2025, among others at 0.2 m/s, while the calmest were 2023, 2024 and 2025, among others at 0.2 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 11.5°C | 11.4°C | 12.8°C | 13.1°C | 13.9°C | +2.4°C |
| Avg High | 16.5°C | 16.6°C | 18.0°C | 18.4°C | 19.5°C | +3°C |
| Avg Low | 6.5°C | 6.1°C | 7.5°C | 7.7°C | 8.2°C | +1.7°C |
| Avg Rain | 85 mm | 101 mm | 86 mm | 93 mm | 70 mm | -15 mm |
September temperatures in Rouyn-Noranda have risen by about 2.6°C between 1981–1985 and 2021–2025.
September has ranged from a record low of -4.2°C (1981) to a record high of 31.9°C (2023).
Rainfall in September is a relatively wet time of year, averaging 89 mm, with a wettest year of 195 mm.
Daytime highs and overnight lows have shifted differently — highs rose about 0.9°C per decade while lows rose 0.6°C per decade, widening the gap between day and night.
One of the best times to visit Rouyn-Noranda
September is one of the best times to visit Rouyn-Noranda. Expect days averaging 17.7°C and nights around 7.2°C (mean 12.5°C) — warmer than Rouyn-Noranda's yearly average — with higher rainfall (89 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 | 19.6°C | 13.8°C | 8.1°C | 25.7°C | 2.2°C | 28 mm | 74% | 0.2 m/s | 3.7 |
| 2024 🔥 | 22.1°C | 16.1°C | 10.1°C | 28.7°C | 2.3°C | 89 mm | 75% | 0.2 m/s | 3.8 |
| 2023 | 21.3°C | 15.1°C | 8.8°C | 31.9°C | 2.5°C | 47 mm | 76% | 0.2 m/s | 3.9 |
| 2022 | 17.9°C | 12.7°C | 7.4°C | 28.3°C | -0.5°C | 89 mm | 79% | 0.2 m/s | 3.5 |
| 2021 | 18.6°C | 13.4°C | 8.2°C | 26.5°C | 2.7°C | 113 mm | 78% | 0.2 m/s | 2.9 |
| 2020 | 17.3°C | 12.1°C | 6.8°C | 23.1°C | -1.5°C | 56 mm | 73% | 0.2 m/s | 3.2 |
| 2019 | 16.9°C | 12.1°C | 7.4°C | 25.1°C | 0.8°C | 103 mm | 82% | 0.2 m/s | 3 |
| 2018 | 19.2°C | 13.0°C | 6.9°C | 29.6°C | -3.1°C | 103 mm | 77% | 0.2 m/s | 3.5 |
| 2017 | 19.9°C | 14.6°C | 9.3°C | 28.6°C | 2.9°C | 52 mm | 81% | 0.2 m/s | 3.6 |
| 2016 | 19.8°C | 14.5°C | 9.1°C | 28.0°C | 2.6°C | 69 mm | 77% | 0.2 m/s | 3.7 |
| 2015 | 21.4°C | 15.5°C | 9.5°C | 28.7°C | 0.7°C | 68 mm | 77% | 0.2 m/s | 3.8 |
| 2014 | 16.5°C | 11.5°C | 6.5°C | 24.9°C | -2.6°C | 98 mm | 83% | 0.2 m/s | 3.2 |
| 2013 | 17.4°C | 11.9°C | 6.4°C | 22.7°C | -0.9°C | 93 mm | 80% | 0.2 m/s | 3.5 |
| 2012 | 17.7°C | 12.5°C | 7.2°C | 29.2°C | 0.1°C | 106 mm | 74% | 0.2 m/s | 3.3 |
| 2011 | 19.0°C | 13.3°C | 7.5°C | 29.0°C | 0.8°C | 44 mm | 75% | 0.2 m/s | 3.7 |
| 2010 🌧️ | 16.3°C | 11.8°C | 7.3°C | 30.5°C | 2.3°C | 195 mm | 82% | 0.2 m/s | 2.7 |
| 2009 | 18.4°C | 12.8°C | 7.2°C | 24.0°C | 0.3°C | 56 mm | 80% | 0.2 m/s | 3.9 |
| 2008 | 17.1°C | 11.8°C | 6.4°C | 26.8°C | -0.6°C | 73 mm | 81% | 0.2 m/s | 3.7 |
| 2007 | 19.2°C | 13.6°C | 7.9°C | 28.7°C | 1.4°C | 47 mm | 73% | 0.2 m/s | 3.2 |
| 2006 | 16.3°C | 11.0°C | 5.7°C | 26.0°C | 0.0°C | 108 mm | 80% | 0.2 m/s | 3.3 |
| 2005 | 20.5°C | 14.6°C | 8.8°C | 30.3°C | 1.9°C | 91 mm | 74% | 0.2 m/s | 3.5 |
| 2004 | 19.1°C | 13.7°C | 8.2°C | 25.4°C | 1.5°C | 41 mm | 82% | 0.2 m/s | 3.5 |
| 2003 | 17.8°C | 13.3°C | 8.8°C | 27.1°C | 1.3°C | 111 mm | 85% | 0.2 m/s | 3.3 |
| 2002 | 19.5°C | 14.3°C | 9.1°C | 29.9°C | 2.1°C | 95 mm | 82% | 0.2 m/s | 3.4 |
| 2001 | 16.7°C | 12.1°C | 7.5°C | 27.0°C | 1.5°C | 158 mm | 85% | 0.2 m/s | 3 |
| 2000 | 15.3°C | 10.5°C | 5.8°C | 24.3°C | -4.0°C | 84 mm | 83% | 0.2 m/s | 2.9 |
| 1999 | 19.5°C | 14.0°C | 8.5°C | 29.7°C | 0.9°C | 129 mm | 77% | 0.2 m/s | 3.4 |
| 1998 | 17.1°C | 12.2°C | 7.2°C | 25.8°C | 2.3°C | 107 mm | 82% | 0.2 m/s | 3 |
| 1997 | 16.4°C | 11.6°C | 6.8°C | 23.0°C | -2.7°C | 83 mm | 82% | 0.2 m/s | 3.3 |
| 1996 | 18.4°C | 13.4°C | 8.4°C | 28.7°C | 0.1°C | 79 mm | 81% | 0.2 m/s | 3.6 |
| 1995 | 15.3°C | 9.5°C | 3.8°C | 23.1°C | -3.3°C | 77 mm | 77% | 0.2 m/s | 3.4 |
| 1994 | 17.5°C | 12.2°C | 6.8°C | 25.3°C | 0.2°C | 88 mm | 82% | 0.2 m/s | 3.5 |
| 1993 ❄️ | 14.6°C | 9.3°C | 4.0°C | 23.0°C | -3.3°C | 97 mm | 80% | 0.2 m/s | 3.2 |
| 1992 | 16.9°C | 11.3°C | 5.8°C | 24.1°C | -2.8°C | 126 mm | 81% | 0.2 m/s | 2.9 |
| 1991 | 15.2°C | 10.0°C | 4.9°C | 24.7°C | -3.1°C | 88 mm | 80% | 0.2 m/s | 3.2 |
| 1990 | 14.9°C | 10.0°C | 5.1°C | 26.0°C | -1.6°C | 135 mm | 84% | 0.2 m/s | 2.9 |
| 1989 | 17.5°C | 11.9°C | 6.4°C | 24.9°C | -3.7°C | 58 mm | 81% | 0.2 m/s | 3.7 |
| 1988 | 16.4°C | 11.3°C | 6.2°C | 25.2°C | 0.2°C | 104 mm | 82% | 0.2 m/s | 3.1 |
| 1987 | 18.1°C | 12.8°C | 7.6°C | 26.7°C | -2.5°C | 65 mm | 77% | 0.2 m/s | 3.5 |
| 1986 | 14.7°C | 9.7°C | 4.8°C | 23.4°C | -1.4°C | 101 mm | 82% | 0.2 m/s | 3 |
| 1985 | 16.8°C | 11.9°C | 7.0°C | 25.8°C | 1.2°C | 67 mm | 82% | 0.2 m/s | 3.2 |
| 1984 | 14.6°C | 9.8°C | 5.0°C | 23.7°C | -2.0°C | 92 mm | 82% | 0.2 m/s | 4 |
| 1983 | 18.2°C | 13.4°C | 8.5°C | 28.0°C | 1.8°C | 102 mm | 82% | 0.2 m/s | — |
| 1982 | 16.5°C | 11.8°C | 7.1°C | 27.4°C | 2.6°C | 108 mm | 84% | 0.2 m/s | — |
| 1981 | 15.6°C | 10.9°C | 6.2°C | 25.8°C | -4.2°C | 71 mm | 81% | 0.2 m/s | — |
Actual recorded September data for each year, 1981–2025 — sourced from NASA POWER.
The average high in September is around 17.7°C with lows near 7.2°C (mean 12.5°C), based on 45 years of NASA POWER data.
September averages 89 mm of rainfall in Rouyn-Noranda, a relatively wet time of year. The wettest on record was 195 mm in 2010.
The hottest September reached 31.9°C in 2023. The coldest dipped to -4.2°C in 1981.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average September temperatures have risen by about 2.6°C. Daytime highs moved from 16.3°C to 19.9°C and overnight lows from 6.8°C to 8.5°C over the same span.
September is one of the warmer months of the year in Rouyn-Noranda and a relatively wet time of year, so plan for around 17.7°C daytime highs and 7.2°C at night.
Not quite — September is the 9th coolest month in Rouyn-Noranda, averaging 12.5°C.
For September in Rouyn-Noranda, pack warm layers and a jacket for chilly mornings, with typical highs of 17.7°C and lows of 7.2°C. Bring an umbrella or light rain jacket too.
Relative humidity in September averages 80% — quite humid.
Average wind speed in September is 0.2 m/s. The windiest September on record averaged 0.2 m/s (1981).
The wettest September on record was 2010 with 195 mm. On average, September sees 89 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 Rouyn-Noranda 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.
