September is one of the warmer months of the year in Dolbeau, with average highs near 17°C and lows around 6.7°C (mean 11.9°C). It is a relatively wet time of year, averaging 91 mm of rainfall and 83% relative humidity across the period.
September is one of the warmer months of the year in Dolbeau. Across 45 years of records, the warmest September in Dolbeau was 2024 — when the month averaged 16°C — while the coldest were 1986 and 1991 at 8.9°C. Typical September days reach 17°C with nights near 6.7°C. The long-term trend is warming, about 0.8°C per decade.
September is a relatively wet time of year in Dolbeau, averaging 91 mm of rainfall. The wettest September on record was 2010 with 179 mm, while the driest was 2025 at 40 mm.
Relative humidity in Dolbeau during September averages 83%. The most humid Septembers were 1987 and 1988 at 86%, and the least humid was 2022 at 77%.
September receives about 3.4 kWh/m²/day of solar energy in Dolbeau. The sunniest September was 1984 at 4 kWh/m²/day, and the cloudiest was 1997 at 2.9.
Average wind speed in Dolbeau during September is 0.2 m/s. The windiest Septembers were 2012, 2013 and 2022, among others at 0.3 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 | 10.7°C | 10.9°C | 12.2°C | 12.5°C | 13.5°C | +2.8°C |
| Avg High | 15.6°C | 16.0°C | 17.5°C | 17.5°C | 19.0°C | +3.4°C |
| Avg Low | 5.7°C | 5.8°C | 7.0°C | 7.4°C | 8.1°C | +2.4°C |
| Avg Rain | 87 mm | 94 mm | 91 mm | 102 mm | 77 mm | -11 mm |
September temperatures in Dolbeau have risen by about 3°C between 1981–1985 and 2021–2025.
September has ranged from a record low of -4.7°C (2000) to a record high of 31.7°C (2023).
Rainfall in September is a relatively wet time of year, averaging 91 mm, with a wettest year of 179 mm.
Daytime highs and overnight lows have shifted differently — highs rose about 0.9°C per decade while lows rose 0.7°C per decade, widening the gap between day and night.
One of the best times to visit Dolbeau
September is one of the best times to visit Dolbeau. Expect days averaging 17°C and nights around 6.7°C (mean 11.9°C) — warmer than Dolbeau's yearly average — with higher rainfall (91 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 | 18.8°C | 13.0°C | 7.3°C | 26.4°C | 0.9°C | 40 mm | 78% | 0.2 m/s | 3.7 |
| 2024 🔥 | 21.4°C | 16.0°C | 10.6°C | 28.4°C | 4.3°C | 49 mm | 78% | 0.2 m/s | 3.5 |
| 2023 | 21.3°C | 15.4°C | 9.4°C | 31.7°C | 4.1°C | 62 mm | 81% | 0.2 m/s | 3.9 |
| 2022 | 18.8°C | 13.0°C | 7.2°C | 26.7°C | 1.1°C | 68 mm | 77% | 0.3 m/s | 3.8 |
| 2021 | 17.7°C | 12.8°C | 8.0°C | 24.7°C | 3.7°C | 108 mm | 82% | 0.2 m/s | 3.2 |
| 2020 | 16.0°C | 11.0°C | 6.1°C | 22.7°C | -3.5°C | 133 mm | 83% | 0.2 m/s | 3.1 |
| 2019 | 16.0°C | 11.0°C | 5.9°C | 23.7°C | -0.8°C | 101 mm | 85% | 0.2 m/s | 3.1 |
| 2018 | 17.8°C | 12.4°C | 7.0°C | 26.6°C | -4.3°C | 92 mm | 81% | 0.2 m/s | 3.6 |
| 2017 | 18.8°C | 13.9°C | 8.9°C | 28.1°C | -0.2°C | 86 mm | 85% | 0.2 m/s | 3.4 |
| 2016 | 18.2°C | 13.2°C | 8.2°C | 25.6°C | 0.7°C | 79 mm | 84% | 0.2 m/s | 3.6 |
| 2015 | 20.2°C | 14.7°C | 9.2°C | 26.3°C | -2.3°C | 69 mm | 84% | 0.2 m/s | 3.8 |
| 2014 | 16.1°C | 10.9°C | 5.6°C | 25.2°C | -2.9°C | 97 mm | 84% | 0.2 m/s | 3.1 |
| 2013 | 16.7°C | 11.6°C | 6.5°C | 22.6°C | 0.4°C | 102 mm | 83% | 0.3 m/s | 3.3 |
| 2012 | 17.2°C | 12.3°C | 7.3°C | 25.8°C | 0.9°C | 143 mm | 83% | 0.3 m/s | 3.2 |
| 2011 | 18.4°C | 13.1°C | 7.8°C | 23.2°C | 2.3°C | 73 mm | 84% | 0.2 m/s | 3.8 |
| 2010 🌧️ | 15.7°C | 11.6°C | 7.5°C | 30.5°C | 2.0°C | 179 mm | 84% | 0.2 m/s | 3 |
| 2009 | 17.5°C | 12.0°C | 6.5°C | 23.9°C | -0.4°C | 53 mm | 83% | 0.2 m/s | 3.9 |
| 2008 | 17.4°C | 11.9°C | 6.5°C | 29.6°C | -2.3°C | 81 mm | 84% | 0.2 m/s | 3.2 |
| 2007 | 17.3°C | 11.8°C | 6.3°C | 27.3°C | 1.4°C | 79 mm | 79% | 0.3 m/s | 3.7 |
| 2006 | 16.4°C | 11.2°C | 6.1°C | 24.3°C | 1.2°C | 164 mm | 82% | 0.3 m/s | 3.3 |
| 2005 | 17.8°C | 12.8°C | 7.9°C | 26.9°C | 3.2°C | 100 mm | 81% | 0.3 m/s | 3.5 |
| 2004 | 18.3°C | 12.6°C | 6.9°C | 25.6°C | 2.8°C | 65 mm | 82% | 0.2 m/s | 3.6 |
| 2003 | 19.1°C | 14.0°C | 8.9°C | 27.4°C | 2.9°C | 89 mm | 83% | 0.2 m/s | 3.3 |
| 2002 | 18.6°C | 13.3°C | 8.1°C | 29.6°C | 1.4°C | 75 mm | 82% | 0.3 m/s | 3.5 |
| 2001 | 17.5°C | 12.5°C | 7.6°C | 28.1°C | 2.7°C | 122 mm | 85% | 0.2 m/s | 3.2 |
| 2000 | 15.2°C | 10.3°C | 5.4°C | 24.3°C | -4.7°C | 78 mm | 82% | 0.2 m/s | 3.1 |
| 1999 | 19.8°C | 14.6°C | 9.4°C | 29.1°C | 0.5°C | 111 mm | 84% | 0.2 m/s | 3.3 |
| 1998 | 16.1°C | 11.4°C | 6.7°C | 22.0°C | 1.3°C | 118 mm | 85% | 0.2 m/s | 3.2 |
| 1997 | 15.4°C | 10.9°C | 6.5°C | 24.2°C | 0.2°C | 89 mm | 85% | 0.2 m/s | 2.9 |
| 1996 | 17.3°C | 12.3°C | 7.3°C | 27.1°C | -0.4°C | 117 mm | 83% | 0.2 m/s | 3.3 |
| 1995 | 14.7°C | 9.1°C | 3.5°C | 21.5°C | -1.3°C | 69 mm | 80% | 0.3 m/s | 3.5 |
| 1994 | 16.4°C | 11.3°C | 6.2°C | 21.2°C | 1.6°C | 73 mm | 86% | 0.2 m/s | 3.5 |
| 1993 | 14.6°C | 9.3°C | 3.9°C | 23.2°C | -2.0°C | 89 mm | 82% | 0.3 m/s | 3.2 |
| 1992 | 16.6°C | 11.2°C | 5.7°C | 24.2°C | -3.4°C | 100 mm | 83% | 0.3 m/s | 3.1 |
| 1991 | 14.0°C | 8.9°C | 3.8°C | 22.8°C | -2.5°C | 47 mm | 81% | 0.2 m/s | 3.4 |
| 1990 | 14.8°C | 9.7°C | 4.7°C | 24.0°C | -0.6°C | 127 mm | 83% | 0.2 m/s | 3.2 |
| 1989 | 17.2°C | 11.6°C | 6.1°C | 25.6°C | -1.7°C | 72 mm | 82% | 0.3 m/s | 3.6 |
| 1988 | 14.3°C | 9.8°C | 5.3°C | 21.3°C | 0.4°C | 117 mm | 86% | 0.2 m/s | 3.1 |
| 1987 | 15.6°C | 10.9°C | 6.2°C | 24.8°C | -0.8°C | 101 mm | 86% | 0.2 m/s | 3.2 |
| 1986 ❄️ | 13.9°C | 8.9°C | 3.9°C | 21.5°C | -1.5°C | 117 mm | 83% | 0.3 m/s | 3.4 |
| 1985 | 16.7°C | 11.5°C | 6.3°C | 26.4°C | 1.2°C | 70 mm | 83% | 0.2 m/s | 3.6 |
| 1984 | 14.1°C | 9.0°C | 3.9°C | 22.2°C | -1.5°C | 46 mm | 82% | 0.3 m/s | 4 |
| 1983 | 16.7°C | 12.0°C | 7.2°C | 27.3°C | 0.6°C | 112 mm | 86% | 0.2 m/s | — |
| 1982 | 16.2°C | 11.2°C | 6.1°C | 25.9°C | -0.8°C | 70 mm | 84% | 0.2 m/s | — |
| 1981 | 15.7°C | 11.2°C | 6.7°C | 23.6°C | 0.4°C | 80 mm | 85% | 0.3 m/s | — |
Actual recorded September data for each year, 1981–2025 — sourced from NASA POWER.
The average high in September is around 17°C with lows near 6.7°C (mean 11.9°C), based on 45 years of NASA POWER data.
September averages 91 mm of rainfall in Dolbeau, a relatively wet time of year. The wettest on record was 179 mm in 2010.
The hottest September reached 31.7°C in 2023. The coldest dipped to -4.7°C in 2000.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average September temperatures have risen by about 3°C. Daytime highs moved from 15.9°C to 19.6°C and overnight lows from 6°C to 8.5°C over the same span.
September is one of the warmer months of the year in Dolbeau and a relatively wet time of year, so plan for around 17°C daytime highs and 6.7°C at night.
Not quite — September is the 9th coolest month in Dolbeau, averaging 11.9°C.
For September in Dolbeau, pack warm layers and a jacket for chilly mornings, with typical highs of 17°C and lows of 6.7°C. Bring an umbrella or light rain jacket too.
Relative humidity in September averages 83% — quite humid.
Average wind speed in September is 0.2 m/s. The windiest September on record averaged 0.3 m/s (1981).
The wettest September on record was 2010 with 179 mm. On average, September sees 91 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 Dolbeau 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.
