September is one of the warmer months of the year in Courtenay, with average highs near 18.2°C and lows around 8.4°C (mean 13.3°C). It is one of the drier months, averaging 56 mm of rainfall and 82% relative humidity across the period.
September is one of the warmer months of the year in Courtenay. Across 45 years of records, the warmest September in Courtenay was 2020 — when the month averaged 15.6°C — while the coldest was 1984 at 11.1°C. Typical September days reach 18.2°C with nights near 8.4°C. The long-term trend is warming, about 0.3°C per decade.
September is one of the drier months in Courtenay, averaging 56 mm of rainfall. The wettest September on record was 1997 with 152 mm, while the driest was 1993 at 2 mm.
Relative humidity in Courtenay during September averages 82%. The most humid September was 2010 at 87%, and the least humid was 2022 at 76%.
September receives about 3.8 kWh/m²/day of solar energy in Courtenay. The sunniest September was 1993 at 4.8 kWh/m²/day, and the cloudiest was 2021 at 3.1.
Average wind speed in Courtenay during September is 0.5 m/s. The windiest Septembers were 2012, 2014 and 2016, among others at 0.6 m/s, while the calmest were 2023, 2024 and 2025, among others at 0.5 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 12.6°C | 13.5°C | 13.0°C | 13.3°C | 14.6°C | +2°C |
| Avg High | 17.5°C | 18.6°C | 17.8°C | 18.0°C | 19.6°C | +2.1°C |
| Avg Low | 7.6°C | 8.3°C | 8.1°C | 8.7°C | 9.5°C | +1.9°C |
| Avg Rain | 55 mm | 42 mm | 52 mm | 77 mm | 56 mm | +0 mm |
September temperatures in Courtenay have risen by about 2.3°C between 1981–1985 and 2021–2025.
September has ranged from a record low of -0.1°C (1983) to a record high of 30.1°C (2024).
Rainfall in September is one of the drier months, averaging 56 mm, with a wettest year of 152 mm.
One of the best times to visit Courtenay
September is one of the best times to visit Courtenay. Expect days averaging 18.2°C and nights around 8.4°C (mean 13.3°C) — warmer than Courtenay's yearly average — with moderate rainfall (56 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 | 20.3°C | 15.4°C | 10.5°C | 28.8°C | 5.1°C | 84 mm | 84% | 0.5 m/s | 3.6 |
| 2024 | 19.4°C | 14.2°C | 9.0°C | 30.1°C | 2.9°C | 46 mm | 81% | 0.5 m/s | 3.6 |
| 2023 | 19.2°C | 13.8°C | 8.3°C | 27.7°C | 2.9°C | 45 mm | 77% | 0.5 m/s | 3.8 |
| 2022 | 20.9°C | 15.3°C | 9.7°C | 27.1°C | 6.4°C | 16 mm | 76% | 0.5 m/s | 4.4 |
| 2021 | 17.5°C | 13.1°C | 8.7°C | 25.2°C | 4.1°C | 94 mm | 84% | 0.5 m/s | 3.1 |
| 2020 🔥 | 20.0°C | 15.6°C | 11.1°C | 26.7°C | 7.0°C | 49 mm | 83% | 0.5 m/s | 3.5 |
| 2019 | 17.3°C | 13.2°C | 9.0°C | 24.2°C | 2.5°C | 96 mm | 85% | 0.5 m/s | 3.2 |
| 2018 | 16.4°C | 12.3°C | 8.1°C | 24.2°C | 4.4°C | 147 mm | 86% | 0.5 m/s | 3.2 |
| 2017 | 19.1°C | 14.4°C | 9.7°C | 27.8°C | 5.1°C | 51 mm | 83% | 0.5 m/s | 3.6 |
| 2016 | 16.8°C | 12.2°C | 7.7°C | 21.8°C | 3.8°C | 55 mm | 84% | 0.6 m/s | 3.6 |
| 2015 | 16.7°C | 12.0°C | 7.3°C | 25.3°C | 3.0°C | 63 mm | 84% | 0.5 m/s | 3.4 |
| 2014 | 20.2°C | 14.9°C | 9.6°C | 26.9°C | 6.3°C | 54 mm | 77% | 0.6 m/s | 3.9 |
| 2013 | 18.9°C | 14.3°C | 9.8°C | 29.4°C | 3.8°C | 110 mm | 85% | 0.5 m/s | 3.5 |
| 2012 | 19.2°C | 13.6°C | 7.9°C | 25.1°C | 3.3°C | 9 mm | 81% | 0.6 m/s | 4.4 |
| 2011 | 18.5°C | 13.9°C | 9.4°C | 26.2°C | 5.0°C | 78 mm | 85% | 0.6 m/s | 3.7 |
| 2010 | 16.6°C | 12.4°C | 8.2°C | 22.1°C | 4.8°C | 104 mm | 87% | 0.5 m/s | 3.2 |
| 2009 | 18.0°C | 13.1°C | 8.1°C | 25.2°C | 1.2°C | 78 mm | 81% | 0.5 m/s | 3.6 |
| 2008 | 18.1°C | 13.1°C | 8.0°C | 25.0°C | 4.7°C | 21 mm | 82% | 0.5 m/s | 4 |
| 2007 | 16.9°C | 12.2°C | 7.4°C | 24.3°C | 3.6°C | 77 mm | 85% | 0.6 m/s | 3.6 |
| 2006 | 19.4°C | 13.8°C | 8.2°C | 27.8°C | 4.4°C | 45 mm | 80% | 0.6 m/s | 4.2 |
| 2005 | 16.9°C | 12.2°C | 7.5°C | 20.8°C | 3.6°C | 37 mm | 83% | 0.6 m/s | 3.9 |
| 2004 | 16.7°C | 12.3°C | 7.9°C | 20.4°C | 4.5°C | 104 mm | 85% | 0.5 m/s | 3.4 |
| 2003 | 19.6°C | 14.2°C | 8.9°C | 27.5°C | 5.9°C | 31 mm | 80% | 0.5 m/s | 3.9 |
| 2002 | 17.6°C | 12.7°C | 7.9°C | 23.2°C | 2.9°C | 45 mm | 83% | 0.6 m/s | 3.9 |
| 2001 | 17.7°C | 12.9°C | 8.0°C | 23.5°C | 5.5°C | 36 mm | 85% | 0.5 m/s | 3.8 |
| 2000 | 17.3°C | 13.0°C | 8.7°C | 23.0°C | 4.9°C | 48 mm | 81% | 0.5 m/s | 3.6 |
| 1999 | 17.4°C | 12.1°C | 6.8°C | 22.9°C | 2.2°C | 32 mm | 80% | 0.6 m/s | 4.5 |
| 1998 | 19.3°C | 13.8°C | 8.3°C | 23.7°C | 5.8°C | 22 mm | 83% | 0.5 m/s | 4.1 |
| 1997 🌧️ | 18.1°C | 13.8°C | 9.5°C | 23.9°C | 7.2°C | 152 mm | 85% | 0.6 m/s | 3.5 |
| 1996 | 16.1°C | 11.4°C | 6.7°C | 22.1°C | 1.7°C | 71 mm | 84% | 0.6 m/s | 3.5 |
| 1995 | 20.3°C | 15.2°C | 10.2°C | 25.8°C | 6.5°C | 26 mm | 77% | 0.6 m/s | 4.1 |
| 1994 | 19.2°C | 14.4°C | 9.6°C | 26.3°C | 6.2°C | 54 mm | 83% | 0.5 m/s | 3.6 |
| 1993 | 19.6°C | 14.1°C | 8.6°C | 29.7°C | 3.2°C | 2 mm | 78% | 0.6 m/s | 4.8 |
| 1992 | 16.0°C | 11.2°C | 6.4°C | 20.9°C | 1.8°C | 50 mm | 83% | 0.6 m/s | 3.7 |
| 1991 | 19.3°C | 13.8°C | 8.3°C | 25.9°C | 4.8°C | 5 mm | 81% | 0.5 m/s | 4.3 |
| 1990 | 20.6°C | 14.7°C | 8.9°C | 24.9°C | 5.8°C | 4 mm | 79% | 0.5 m/s | 4.3 |
| 1989 | 19.9°C | 14.1°C | 8.4°C | 24.0°C | 5.1°C | 17 mm | 78% | 0.6 m/s | 4.5 |
| 1988 | 18.0°C | 12.6°C | 7.3°C | 29.4°C | 4.1°C | 78 mm | 80% | 0.5 m/s | 3.8 |
| 1987 | 19.6°C | 14.2°C | 8.8°C | 25.0°C | 4.3°C | 25 mm | 80% | 0.5 m/s | 3.9 |
| 1986 | 16.5°C | 12.0°C | 7.4°C | 22.4°C | 4.4°C | 44 mm | 82% | 0.5 m/s | 3.8 |
| 1985 | 16.7°C | 11.7°C | 6.7°C | 23.2°C | 3.6°C | 52 mm | 78% | 0.6 m/s | 3.8 |
| 1984 ❄️ | 15.3°C | 11.1°C | 6.9°C | 19.5°C | 3.6°C | 71 mm | 82% | 0.6 m/s | 3.4 |
| 1983 | 16.2°C | 11.3°C | 6.4°C | 22.1°C | -0.1°C | 60 mm | 81% | 0.6 m/s | — |
| 1982 | 18.3°C | 13.6°C | 8.8°C | 24.6°C | 5.0°C | 35 mm | 82% | 0.5 m/s | — |
| 1981 | 17.1°C | 12.6°C | 8.0°C | 26.2°C | 3.1°C | 117 mm | 84% | 0.6 m/s | — |
Actual recorded September data for each year, 1981–2025 — sourced from NASA POWER.
The average high in September is around 18.2°C with lows near 8.4°C (mean 13.3°C), based on 45 years of NASA POWER data.
September averages 56 mm of rainfall in Courtenay, one of the drier months. The wettest on record was 152 mm in 1997.
The hottest September reached 30.1°C in 2024. The coldest dipped to -0.1°C in 1983.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average September temperatures have risen by about 2.3°C. Daytime highs moved from 16.7°C to 19.5°C and overnight lows from 7.4°C to 9.2°C over the same span.
September is one of the warmer months of the year in Courtenay and one of the drier months, so plan for around 18.2°C daytime highs and 8.4°C at night.
Not quite — September is the 10th coolest month in Courtenay, averaging 13.3°C.
For September in Courtenay, pack light layers you can adjust through the day, with typical highs of 18.2°C and lows of 8.4°C. Bring an umbrella or light rain jacket too.
Relative humidity in September averages 82% — quite humid.
Average wind speed in September is 0.5 m/s. The windiest September on record averaged 0.6 m/s (1981).
The wettest September on record was 1997 with 152 mm. On average, September sees 56 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 Courtenay 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.
