September is one of the warmer months of the year in Shawinigan, with average highs near 19.4°C and lows around 8.8°C (mean 14.1°C). It is about average for rainfall, averaging 89 mm of rainfall and 81% relative humidity across the period.
September is one of the warmer months of the year in Shawinigan. Across 45 years of records, the warmest September in Shawinigan was 2023 — when the month averaged 17.3°C — while the coldest was 1991 at 11.2°C. Typical September days reach 19.4°C with nights near 8.8°C. The long-term trend is warming, about 0.7°C per decade.
September is about average for rainfall in Shawinigan, averaging 89 mm of rainfall. The wettest September on record was 2010 with 189 mm, while the driest was 2025 at 33 mm.
Relative humidity in Shawinigan during September averages 81%. The most humid September was 1987 at 85%, and the least humid was 2025 at 72%.
September receives about 3.7 kWh/m²/day of solar energy in Shawinigan. The sunniest September was 2025 at 4.4 kWh/m²/day, and the cloudiest was 2010 at 3.1.
Average wind speed in Shawinigan during September is 0.3 m/s. The windiest Septembers were 2022, 2023 and 2025, among others at 0.3 m/s, while the calmest were 2001, 2019 and 2024, 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 | 13.0°C | 13.3°C | 14.3°C | 14.9°C | 15.6°C | +2.6°C |
| Avg High | 18.2°C | 18.5°C | 19.7°C | 20.0°C | 21.2°C | +3°C |
| Avg Low | 7.8°C | 8.1°C | 9.0°C | 9.8°C | 10.0°C | +2.2°C |
| Avg Rain | 98 mm | 92 mm | 91 mm | 98 mm | 53 mm | -45 mm |
September temperatures in Shawinigan have risen by about 2.9°C between 1981–1985 and 2021–2025.
September has ranged from a record low of -2.4°C (2000) to a record high of 32°C (2023).
Rainfall in September is about average for rainfall, averaging 89 mm, with a wettest year of 189 mm.
One of the best times to visit Shawinigan
September is one of the best times to visit Shawinigan. Expect days averaging 19.4°C and nights around 8.8°C (mean 14.1°C) — warmer than Shawinigan'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 | 22.1°C | 15.9°C | 9.7°C | 26.9°C | 2.4°C | 33 mm | 72% | 0.3 m/s | 4.4 |
| 2024 | 23.1°C | 17.2°C | 11.4°C | 29.3°C | 5.9°C | 36 mm | 75% | 0.2 m/s | 4 |
| 2023 🔥 | 23.0°C | 17.3°C | 11.5°C | 32.0°C | 6.0°C | 39 mm | 78% | 0.3 m/s | 4.1 |
| 2022 | 20.1°C | 14.6°C | 9.1°C | 28.1°C | 2.0°C | 73 mm | 75% | 0.3 m/s | 3.9 |
| 2021 | 20.7°C | 15.5°C | 10.3°C | 24.5°C | 4.7°C | 65 mm | 78% | 0.3 m/s | 3.6 |
| 2020 | 18.2°C | 13.0°C | 7.8°C | 23.7°C | 0.6°C | 69 mm | 80% | 0.3 m/s | 3.4 |
| 2019 | 18.7°C | 13.5°C | 8.3°C | 25.2°C | 1.3°C | 136 mm | 84% | 0.2 m/s | 3.5 |
| 2018 | 20.3°C | 15.1°C | 9.8°C | 27.4°C | -1.2°C | 89 mm | 82% | 0.3 m/s | 3.7 |
| 2017 | 21.8°C | 16.7°C | 11.6°C | 28.8°C | 4.8°C | 54 mm | 84% | 0.3 m/s | 4 |
| 2016 | 20.6°C | 15.3°C | 10.1°C | 27.0°C | 3.4°C | 58 mm | 81% | 0.3 m/s | 4.2 |
| 2015 | 22.0°C | 16.6°C | 11.3°C | 27.4°C | 1.9°C | 101 mm | 82% | 0.3 m/s | 4.1 |
| 2014 | 19.0°C | 13.8°C | 8.6°C | 26.5°C | -1.6°C | 78 mm | 83% | 0.3 m/s | 3.5 |
| 2013 | 18.7°C | 13.5°C | 8.2°C | 26.7°C | 1.7°C | 85 mm | 81% | 0.3 m/s | 3.7 |
| 2012 | 19.2°C | 14.0°C | 8.8°C | 26.1°C | 2.4°C | 91 mm | 81% | 0.3 m/s | 3.7 |
| 2011 | 20.8°C | 15.7°C | 10.6°C | 25.4°C | 3.9°C | 101 mm | 84% | 0.3 m/s | 3.7 |
| 2010 🌧️ | 19.1°C | 14.7°C | 10.3°C | 30.0°C | 4.8°C | 189 mm | 84% | 0.3 m/s | 3.1 |
| 2009 | 18.9°C | 13.4°C | 8.0°C | 23.7°C | 1.4°C | 68 mm | 82% | 0.3 m/s | 4.2 |
| 2008 | 20.0°C | 14.6°C | 9.2°C | 29.6°C | 1.1°C | 83 mm | 83% | 0.3 m/s | 3.6 |
| 2007 | 20.0°C | 14.4°C | 8.8°C | 27.6°C | 3.3°C | 93 mm | 81% | 0.3 m/s | 4.2 |
| 2006 | 18.6°C | 13.3°C | 8.1°C | 23.3°C | 2.6°C | 92 mm | 83% | 0.3 m/s | 3.4 |
| 2005 | 20.4°C | 15.0°C | 9.7°C | 26.8°C | 3.5°C | 131 mm | 83% | 0.3 m/s | 3.8 |
| 2004 | 19.7°C | 14.4°C | 9.0°C | 24.4°C | 4.7°C | 98 mm | 82% | 0.3 m/s | 4 |
| 2003 | 21.0°C | 15.6°C | 10.2°C | 26.5°C | 4.5°C | 81 mm | 80% | 0.3 m/s | 3.8 |
| 2002 | 21.2°C | 15.6°C | 10.0°C | 29.5°C | 3.1°C | 95 mm | 79% | 0.3 m/s | 4.2 |
| 2001 | 19.7°C | 14.7°C | 9.6°C | 27.5°C | 3.9°C | 57 mm | 81% | 0.2 m/s | 3.8 |
| 2000 | 17.4°C | 12.3°C | 7.2°C | 24.7°C | -2.4°C | 109 mm | 82% | 0.3 m/s | 3.4 |
| 1999 | 21.3°C | 16.3°C | 11.3°C | 30.4°C | 4.5°C | 167 mm | 82% | 0.3 m/s | 3.4 |
| 1998 | 20.0°C | 14.6°C | 9.3°C | 25.4°C | 2.5°C | 70 mm | 77% | 0.3 m/s | 3.7 |
| 1997 | 18.8°C | 13.5°C | 8.3°C | 25.1°C | 1.5°C | 56 mm | 79% | 0.3 m/s | 3.2 |
| 1996 | 19.6°C | 14.5°C | 9.5°C | 27.5°C | 1.4°C | 82 mm | 82% | 0.3 m/s | 3.5 |
| 1995 | 17.5°C | 11.6°C | 5.6°C | 25.1°C | -0.3°C | 62 mm | 75% | 0.3 m/s | 3.9 |
| 1994 | 18.4°C | 13.3°C | 8.1°C | 22.9°C | 3.9°C | 62 mm | 83% | 0.3 m/s | 3.4 |
| 1993 | 17.5°C | 12.3°C | 7.2°C | 25.5°C | -0.3°C | 113 mm | 80% | 0.3 m/s | 3.3 |
| 1992 | 18.2°C | 13.2°C | 8.1°C | 25.3°C | -1.4°C | 110 mm | 82% | 0.3 m/s | 3.4 |
| 1991 ❄️ | 16.4°C | 11.2°C | 5.9°C | 23.8°C | -1.6°C | 78 mm | 81% | 0.3 m/s | 3.7 |
| 1990 | 17.3°C | 12.2°C | 7.2°C | 24.1°C | 1.5°C | 117 mm | 82% | 0.3 m/s | 3.3 |
| 1989 | 19.3°C | 13.8°C | 8.4°C | 27.3°C | 0.3°C | 81 mm | 81% | 0.3 m/s | 3.7 |
| 1988 | 17.3°C | 12.2°C | 7.0°C | 24.2°C | 0.9°C | 78 mm | 82% | 0.3 m/s | 3.6 |
| 1987 | 17.8°C | 12.8°C | 7.8°C | 26.9°C | -1.4°C | 130 mm | 85% | 0.2 m/s | 3.4 |
| 1986 | 17.0°C | 11.8°C | 6.6°C | 23.9°C | 0.2°C | 155 mm | 82% | 0.3 m/s | 3.3 |
| 1985 | 19.2°C | 13.8°C | 8.4°C | 25.7°C | 3.3°C | 97 mm | 82% | 0.2 m/s | 4 |
| 1984 | 17.0°C | 11.6°C | 6.2°C | 22.5°C | 0.1°C | 47 mm | 80% | 0.3 m/s | 4.3 |
| 1983 | 19.8°C | 14.5°C | 9.2°C | 27.8°C | 3.1°C | 76 mm | 82% | 0.3 m/s | — |
| 1982 | 18.6°C | 13.4°C | 8.2°C | 26.7°C | 3.0°C | 105 mm | 84% | 0.3 m/s | — |
| 1981 | 17.5°C | 12.9°C | 8.3°C | 24.5°C | 1.2°C | 109 mm | 83% | 0.3 m/s | — |
Actual recorded September data for each year, 1981–2025 — sourced from NASA POWER.
The average high in September is around 19.4°C with lows near 8.8°C (mean 14.1°C), based on 45 years of NASA POWER data.
September averages 89 mm of rainfall in Shawinigan, about average for rainfall. The wettest on record was 189 mm in 2010.
The hottest September reached 32°C in 2023. The coldest dipped to -2.4°C in 2000.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average September temperatures have risen by about 2.9°C. Daytime highs moved from 18.4°C to 21.8°C and overnight lows from 8.1°C to 10.4°C over the same span.
September is one of the warmer months of the year in Shawinigan and about average for rainfall, so plan for around 19.4°C daytime highs and 8.8°C at night.
Not quite — September is the 9th coolest month in Shawinigan, averaging 14.1°C.
For September in Shawinigan, pack light layers you can adjust through the day, with typical highs of 19.4°C and lows of 8.8°C. Bring an umbrella or light rain jacket too.
Relative humidity in September averages 81% — quite humid.
Average wind speed in September is 0.3 m/s. The windiest September on record averaged 0.3 m/s (1981).
The wettest September on record was 2010 with 189 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 Shawinigan 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.
