September is one of the warmer months of the year in Canmore, with average highs near 12°C and lows around 0.6°C (mean 6.3°C). It is about average for rainfall, averaging 57 mm of rainfall and 74% relative humidity across the period.
September is one of the warmer months of the year in Canmore. Across 45 years of records, the warmest September in Canmore was 2025 — when the month averaged 11.1°C — while the coldest was 1985 at 1.4°C. Typical September days reach 12°C with nights near 0.6°C. The long-term trend is warming, about 0.5°C per decade.
September is about average for rainfall in Canmore, averaging 57 mm of rainfall. The wettest September on record was 1985 with 112 mm, while the driest was 1990 at 9 mm.
Relative humidity in Canmore during September averages 74%. The most humid September was 2004 at 85%, and the least humid was 1994 at 60%.
September receives about 3.7 kWh/m²/day of solar energy in Canmore. The sunniest Septembers were 2009 and 2012 at 4.4 kWh/m²/day, and the cloudiest was 1986 at 2.8.
Average wind speed in Canmore during September is 0.3 m/s. The windiest Septembers were 1990, 1994 and 1998, among others at 0.4 m/s, while the calmest were 2018, 2019 and 2021, 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 | 4.7°C | 7.1°C | 6.0°C | 5.8°C | 8.5°C | +3.8°C |
| Avg High | 10.4°C | 13.2°C | 11.7°C | 11.0°C | 14.2°C | +3.8°C |
| Avg Low | -0.9°C | 0.8°C | 0.2°C | 0.6°C | 2.8°C | +3.7°C |
| Avg Rain | 64 mm | 36 mm | 67 mm | 75 mm | 38 mm | -26 mm |
September temperatures in Canmore have risen by about 5°C between 1981–1985 and 2021–2025.
September has ranged from a record low of -12°C (1985) to a record high of 27.5°C (1988).
Rainfall in September is about average for rainfall, averaging 57 mm, with a wettest year of 112 mm.
Daytime highs and overnight lows have shifted differently — highs rose about 0.4°C per decade while lows rose 0.7°C per decade, narrowing the gap between day and night.
One of the best times to visit Canmore
September is one of the best times to visit Canmore. Expect days averaging 12°C and nights around 0.6°C (mean 6.3°C) — warmer than Canmore's yearly average — with moderate rainfall (57 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 🔥 | 16.5°C | 11.1°C | 5.7°C | 23.9°C | -0.8°C | 31 mm | 76% | 0.3 m/s | 4 |
| 2024 | 14.0°C | 8.7°C | 3.3°C | 22.7°C | -4.7°C | 53 mm | 76% | 0.3 m/s | 3.8 |
| 2023 | 12.8°C | 7.4°C | 1.9°C | 20.3°C | -3.4°C | 47 mm | 76% | 0.3 m/s | 3.8 |
| 2022 | 15.5°C | 9.4°C | 3.4°C | 26.6°C | -3.1°C | 36 mm | 70% | 0.3 m/s | 4.1 |
| 2021 | 12.6°C | 6.7°C | 0.8°C | 19.2°C | -4.6°C | 36 mm | 75% | 0.2 m/s | 3.9 |
| 2020 | 13.8°C | 7.9°C | 2.0°C | 20.2°C | -4.7°C | 27 mm | 76% | 0.3 m/s | 3.6 |
| 2019 | 9.5°C | 5.1°C | 0.7°C | 19.0°C | -9.2°C | 76 mm | 84% | 0.2 m/s | 3.2 |
| 2018 | 8.2°C | 3.6°C | -1.0°C | 18.7°C | -6.8°C | 88 mm | 81% | 0.2 m/s | 2.9 |
| 2017 | 12.6°C | 6.8°C | 1.0°C | 23.5°C | -6.1°C | 48 mm | 74% | 0.3 m/s | 3.5 |
| 2016 | 9.6°C | 4.9°C | 0.2°C | 15.7°C | -4.3°C | 73 mm | 84% | 0.2 m/s | 3.6 |
| 2015 | 9.6°C | 4.6°C | -0.4°C | 19.8°C | -4.4°C | 89 mm | 81% | 0.2 m/s | 3.5 |
| 2014 | 11.3°C | 5.8°C | 0.4°C | 18.7°C | -10.1°C | 97 mm | 81% | 0.3 m/s | 3.6 |
| 2013 | 12.6°C | 7.7°C | 2.9°C | 21.3°C | -4.7°C | 90 mm | 78% | 0.2 m/s | 3.9 |
| 2012 | 13.8°C | 7.6°C | 1.4°C | 19.8°C | -4.4°C | 41 mm | 74% | 0.3 m/s | 4.4 |
| 2011 | 13.4°C | 7.5°C | 1.5°C | 19.8°C | -3.8°C | 41 mm | 73% | 0.2 m/s | 4.3 |
| 2010 | 9.6°C | 4.3°C | -0.9°C | 16.1°C | -5.8°C | 107 mm | 83% | 0.2 m/s | 3.1 |
| 2009 | 15.3°C | 8.5°C | 1.8°C | 22.5°C | -5.3°C | 23 mm | 66% | 0.3 m/s | 4.4 |
| 2008 | 11.6°C | 6.1°C | 0.5°C | 21.1°C | -4.3°C | 61 mm | 75% | 0.3 m/s | 3.9 |
| 2007 | 10.3°C | 4.9°C | -0.5°C | 19.0°C | -4.8°C | 68 mm | 76% | 0.3 m/s | 3.9 |
| 2006 | 13.3°C | 7.4°C | 1.4°C | 23.9°C | -9.9°C | 64 mm | 73% | 0.3 m/s | 3.7 |
| 2005 | 8.9°C | 4.1°C | -0.8°C | 15.2°C | -4.2°C | 106 mm | 80% | 0.3 m/s | 3.5 |
| 2004 | 9.4°C | 4.6°C | -0.2°C | 16.3°C | -5.1°C | 87 mm | 85% | 0.2 m/s | 3.1 |
| 2003 | 12.2°C | 6.2°C | 0.2°C | 23.9°C | -9.3°C | 72 mm | 71% | 0.2 m/s | 3.6 |
| 2002 | 10.7°C | 5.2°C | -0.4°C | 19.3°C | -6.2°C | 86 mm | 77% | 0.3 m/s | 3.3 |
| 2001 | 14.9°C | 8.0°C | 1.1°C | 23.8°C | -3.1°C | 36 mm | 64% | 0.3 m/s | 3.9 |
| 2000 | 10.9°C | 5.0°C | -0.8°C | 21.1°C | -9.9°C | 66 mm | 75% | 0.3 m/s | 3.6 |
| 1999 | 10.8°C | 5.2°C | -0.4°C | 19.6°C | -9.2°C | 43 mm | 73% | 0.3 m/s | 4.1 |
| 1998 | 16.4°C | 9.6°C | 2.8°C | 24.7°C | -3.5°C | 29 mm | 63% | 0.4 m/s | 4 |
| 1997 | 14.1°C | 8.2°C | 2.2°C | 22.1°C | -3.2°C | 69 mm | 71% | 0.3 m/s | 3.9 |
| 1996 | 10.3°C | 4.7°C | -0.9°C | 23.3°C | -7.4°C | 51 mm | 75% | 0.2 m/s | 3 |
| 1995 | 14.8°C | 8.5°C | 2.1°C | 23.0°C | -6.3°C | 33 mm | 65% | 0.3 m/s | 4 |
| 1994 | 15.7°C | 9.0°C | 2.2°C | 21.1°C | -2.4°C | 13 mm | 60% | 0.4 m/s | 3.7 |
| 1993 | 11.0°C | 5.2°C | -0.6°C | 17.5°C | -6.1°C | 35 mm | 75% | 0.3 m/s | 4 |
| 1992 | 9.6°C | 3.8°C | -2.0°C | 20.2°C | -6.7°C | 41 mm | 71% | 0.2 m/s | 3.3 |
| 1991 | 13.3°C | 7.0°C | 0.7°C | 19.7°C | -4.7°C | 38 mm | 69% | 0.3 m/s | 3.9 |
| 1990 | 16.4°C | 9.3°C | 2.3°C | 20.4°C | -3.2°C | 9 mm | 63% | 0.4 m/s | 4.3 |
| 1989 | 12.4°C | 6.4°C | 0.3°C | 18.0°C | -4.6°C | 43 mm | 73% | 0.3 m/s | 3.9 |
| 1988 | 12.2°C | 6.1°C | 0.1°C | 27.5°C | -8.5°C | 62 mm | 70% | 0.2 m/s | 3.1 |
| 1987 | 16.0°C | 9.0°C | 2.1°C | 23.7°C | -3.4°C | 33 mm | 62% | 0.4 m/s | 4.1 |
| 1986 | 7.4°C | 2.4°C | -2.7°C | 16.0°C | -7.6°C | 88 mm | 83% | 0.2 m/s | 2.8 |
| 1985 ❄️ 🌧️ | 6.6°C | 1.4°C | -3.9°C | 15.0°C | -12.0°C | 112 mm | 79% | 0.2 m/s | 3.2 |
| 1984 | 7.9°C | 2.6°C | -2.6°C | 17.7°C | -11.3°C | 84 mm | 75% | 0.2 m/s | 3.4 |
| 1983 | 8.4°C | 3.0°C | -2.4°C | 16.8°C | -8.5°C | 46 mm | 76% | 0.2 m/s | — |
| 1982 | 10.9°C | 5.4°C | -0.2°C | 19.2°C | -7.0°C | 73 mm | 79% | 0.2 m/s | — |
| 1981 | 11.5°C | 6.3°C | 1.1°C | 22.5°C | -5.0°C | 34 mm | 75% | 0.3 m/s | — |
Actual recorded September data for each year, 1981–2025 — sourced from NASA POWER.
The average high in September is around 12°C with lows near 0.6°C (mean 6.3°C), based on 45 years of NASA POWER data.
September averages 57 mm of rainfall in Canmore, about average for rainfall. The wettest on record was 112 mm in 1985.
The hottest September reached 27.5°C in 1988. The coldest dipped to -12°C in 1985.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average September temperatures have risen by about 5°C. Daytime highs moved from 9.1°C to 14.3°C and overnight lows from -1.6°C to 3°C over the same span.
September is one of the warmer months of the year in Canmore and about average for rainfall, so plan for around 12°C daytime highs and 0.6°C at night.
Not quite — September is the 9th coolest month in Canmore, averaging 6.3°C.
For September in Canmore, pack warm layers and a jacket for chilly mornings, with typical highs of 12°C and lows of 0.6°C. Bring an umbrella or light rain jacket too.
Relative humidity in September averages 74% — moderately humid.
Average wind speed in September is 0.3 m/s. The windiest September on record averaged 0.4 m/s (1987).
The wettest September on record was 1985 with 112 mm. On average, September sees 57 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 Canmore 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.
