September is one of the warmer months of the year in Whistler, with average highs near 13.9°C and lows around 4.5°C (mean 9.2°C). It is one of the drier months, averaging 97 mm of rainfall and 80% relative humidity across the period.
September is one of the warmer months of the year in Whistler. Across 45 years of records, the warmest September in Whistler was 2025 — when the month averaged 12.2°C — while the coldest was 1984 at 6.2°C. Typical September days reach 13.9°C with nights near 4.5°C. The long-term trend is warming, about 0.3°C per decade.
September is one of the drier months in Whistler, averaging 97 mm of rainfall. The wettest September on record was 2021 with 217 mm, while the driest was 1993 at 11 mm.
Relative humidity in Whistler during September averages 80%. The most humid September was 2019 at 87%, and the least humid was 1990 at 71%.
September receives about 3.6 kWh/m²/day of solar energy in Whistler. The sunniest September was 1993 at 4.3 kWh/m²/day, and the cloudiest was 2019 at 2.9.
Average wind speed in Whistler during September is 0.3 m/s. The windiest Septembers were 2008, 2012 and 2022, among others at 0.4 m/s, while the calmest were 2019, 2021 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 | 8.2°C | 9.6°C | 8.9°C | 9.2°C | 10.4°C | +2.2°C |
| Avg High | 13.0°C | 14.7°C | 13.5°C | 13.6°C | 15.0°C | +2°C |
| Avg Low | 3.4°C | 4.6°C | 4.3°C | 4.8°C | 5.9°C | +2.5°C |
| Avg Rain | 76 mm | 67 mm | 89 mm | 139 mm | 121 mm | +45 mm |
September temperatures in Whistler have risen by about 2.8°C between 1981–1985 and 2021–2025.
September has ranged from a record low of -4.5°C (2000) to a record high of 32.7°C (1988).
Rainfall in September is one of the drier months, averaging 97 mm, with a wettest year of 217 mm.
Daytime highs and overnight lows have shifted differently — highs rose about 0.2°C per decade while lows rose 0.5°C per decade, narrowing the gap between day and night.
One of the best times to visit Whistler
September is one of the best times to visit Whistler. Expect days averaging 13.9°C and nights around 4.5°C (mean 9.2°C) — warmer than Whistler's yearly average — with higher rainfall (97 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 🔥 | 16.6°C | 12.2°C | 7.9°C | 28.3°C | 2.8°C | 133 mm | 85% | 0.3 m/s | 3.6 |
| 2024 | 14.6°C | 10.0°C | 5.5°C | 27.1°C | -4.0°C | 92 mm | 83% | 0.2 m/s | 3.6 |
| 2023 | 13.6°C | 9.1°C | 4.5°C | 21.4°C | -2.0°C | 101 mm | 81% | 0.3 m/s | 3.5 |
| 2022 | 16.7°C | 11.2°C | 5.7°C | 25.7°C | -0.9°C | 38 mm | 76% | 0.4 m/s | 4.1 |
| 2021 🌧️ | 12.1°C | 8.5°C | 4.8°C | 21.6°C | -1.6°C | 217 mm | 86% | 0.2 m/s | 3 |
| 2020 | 16.2°C | 11.5°C | 6.8°C | 24.4°C | 1.5°C | 143 mm | 83% | 0.3 m/s | 3.6 |
| 2019 | 12.2°C | 8.5°C | 4.9°C | 21.1°C | -4.5°C | 200 mm | 87% | 0.2 m/s | 2.9 |
| 2018 | 11.7°C | 7.7°C | 3.8°C | 19.9°C | 0.1°C | 209 mm | 85% | 0.2 m/s | 3.1 |
| 2017 | 14.9°C | 10.2°C | 5.6°C | 27.5°C | -0.3°C | 59 mm | 79% | 0.3 m/s | 3.3 |
| 2016 | 12.0°C | 7.6°C | 3.3°C | 20.1°C | -1.9°C | 94 mm | 84% | 0.3 m/s | 3.3 |
| 2015 | 11.4°C | 7.2°C | 3.1°C | 22.0°C | -1.4°C | 154 mm | 85% | 0.3 m/s | 3.3 |
| 2014 | 15.3°C | 10.4°C | 5.5°C | 22.5°C | -2.0°C | 87 mm | 77% | 0.3 m/s | 3.9 |
| 2013 | 14.3°C | 10.1°C | 5.8°C | 27.5°C | -2.1°C | 212 mm | 83% | 0.3 m/s | 3.5 |
| 2012 | 17.1°C | 11.4°C | 5.8°C | 24.9°C | -0.5°C | 23 mm | 72% | 0.4 m/s | 4.2 |
| 2011 | 15.3°C | 10.8°C | 6.4°C | 28.8°C | 1.2°C | 150 mm | 77% | 0.3 m/s | 3.6 |
| 2010 | 12.2°C | 8.0°C | 3.8°C | 18.6°C | -0.5°C | 199 mm | 86% | 0.2 m/s | 3.1 |
| 2009 | 14.2°C | 9.7°C | 5.2°C | 24.7°C | -2.6°C | 118 mm | 81% | 0.3 m/s | 3.6 |
| 2008 | 15.3°C | 9.8°C | 4.4°C | 25.4°C | -0.8°C | 31 mm | 75% | 0.4 m/s | 3.9 |
| 2007 | 12.1°C | 7.9°C | 3.7°C | 22.2°C | -2.9°C | 102 mm | 83% | 0.3 m/s | 3.4 |
| 2006 | 15.7°C | 10.7°C | 5.6°C | 26.7°C | -1.9°C | 59 mm | 74% | 0.4 m/s | 3.8 |
| 2005 | 11.7°C | 7.6°C | 3.4°C | 16.0°C | -1.3°C | 95 mm | 84% | 0.3 m/s | 3.4 |
| 2004 | 11.5°C | 7.7°C | 3.8°C | 18.8°C | -0.3°C | 147 mm | 86% | 0.2 m/s | 3 |
| 2003 | 14.9°C | 9.8°C | 4.8°C | 24.8°C | 0.9°C | 78 mm | 79% | 0.3 m/s | 3.8 |
| 2002 | 12.9°C | 8.1°C | 3.4°C | 19.3°C | -0.9°C | 80 mm | 78% | 0.3 m/s | 3.5 |
| 2001 | 13.8°C | 9.2°C | 4.6°C | 21.0°C | 0.5°C | 81 mm | 81% | 0.3 m/s | 3.8 |
| 2000 | 12.7°C | 8.1°C | 3.6°C | 22.8°C | -4.5°C | 101 mm | 82% | 0.3 m/s | 3.5 |
| 1999 | 14.1°C | 8.6°C | 3.1°C | 22.9°C | -2.6°C | 62 mm | 74% | 0.4 m/s | 4 |
| 1998 | 15.8°C | 10.7°C | 5.7°C | 19.8°C | -0.6°C | 33 mm | 79% | 0.4 m/s | 3.9 |
| 1997 | 13.8°C | 9.6°C | 5.4°C | 23.1°C | -1.6°C | 209 mm | 82% | 0.3 m/s | 3.5 |
| 1996 | 11.6°C | 7.5°C | 3.3°C | 21.0°C | -3.0°C | 115 mm | 83% | 0.3 m/s | 3.3 |
| 1995 | 16.4°C | 10.9°C | 5.5°C | 26.0°C | -1.2°C | 45 mm | 74% | 0.4 m/s | 4.1 |
| 1994 | 14.9°C | 10.4°C | 5.8°C | 23.7°C | 1.5°C | 73 mm | 80% | 0.3 m/s | 3.5 |
| 1993 | 15.9°C | 10.2°C | 4.5°C | 22.7°C | -1.5°C | 11 mm | 72% | 0.4 m/s | 4.3 |
| 1992 | 10.9°C | 6.4°C | 2.0°C | 18.6°C | -4.3°C | 79 mm | 83% | 0.3 m/s | 3.2 |
| 1991 | 16.1°C | 10.6°C | 5.1°C | 21.4°C | 0.7°C | 12 mm | 74% | 0.4 m/s | 3.9 |
| 1990 | 17.3°C | 11.6°C | 5.8°C | 22.2°C | 1.1°C | 34 mm | 71% | 0.4 m/s | 3.9 |
| 1989 | 15.9°C | 10.3°C | 4.7°C | 21.9°C | 0.5°C | 22 mm | 73% | 0.4 m/s | 3.9 |
| 1988 | 13.5°C | 8.5°C | 3.5°C | 32.7°C | -2.3°C | 98 mm | 78% | 0.3 m/s | 3.2 |
| 1987 | 16.6°C | 11.0°C | 5.4°C | 27.4°C | 0.2°C | 40 mm | 74% | 0.3 m/s | 3.7 |
| 1986 | 11.5°C | 7.0°C | 2.6°C | 19.4°C | -2.7°C | 78 mm | 82% | 0.3 m/s | 3.4 |
| 1985 | 11.4°C | 6.6°C | 1.8°C | 17.3°C | -2.9°C | 89 mm | 78% | 0.3 m/s | 3.6 |
| 1984 ❄️ | 10.6°C | 6.2°C | 1.7°C | 15.1°C | -3.8°C | 93 mm | 80% | 0.3 m/s | 3.4 |
| 1983 | 11.1°C | 6.7°C | 2.2°C | 17.9°C | -4.2°C | 81 mm | 79% | 0.3 m/s | — |
| 1982 | 14.1°C | 9.3°C | 4.5°C | 21.6°C | -3.1°C | 62 mm | 81% | 0.3 m/s | — |
| 1981 | 12.4°C | 8.1°C | 3.9°C | 24.1°C | -2.1°C | 117 mm | 82% | 0.3 m/s | — |
Actual recorded September data for each year, 1981–2025 — sourced from NASA POWER.
The average high in September is around 13.9°C with lows near 4.5°C (mean 9.2°C), based on 45 years of NASA POWER data.
September averages 97 mm of rainfall in Whistler, one of the drier months. The wettest on record was 217 mm in 2021.
The hottest September reached 32.7°C in 1988. The coldest dipped to -4.5°C in 2000.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average September temperatures have risen by about 2.8°C. Daytime highs moved from 11.9°C to 14.7°C and overnight lows from 2.8°C to 5.7°C over the same span.
September is one of the warmer months of the year in Whistler and one of the drier months, so plan for around 13.9°C daytime highs and 4.5°C at night.
Not quite — September is the 9th coolest month in Whistler, averaging 9.2°C.
For September in Whistler, pack warm layers and a jacket for chilly mornings, with typical highs of 13.9°C and lows of 4.5°C. Bring an umbrella or light rain jacket too.
Relative humidity in September averages 80% — quite humid.
Average wind speed in September is 0.3 m/s. The windiest September on record averaged 0.4 m/s (1989).
The wettest September on record was 2021 with 217 mm. On average, September sees 97 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 Whistler 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.
