September is one of the warmer months of the year in Cranbrook, with average highs near 18.7°C and lows around 4.7°C (mean 11.7°C). It is about average for rainfall, averaging 37 mm of rainfall and 60% relative humidity across the period.
September is one of the warmer months of the year in Cranbrook. Across 45 years of records, the warmest September in Cranbrook was 2025 — when the month averaged 16.7°C — while the coldest was 1985 at 6.2°C. Typical September days reach 18.7°C with nights near 4.7°C. The long-term trend is warming, about 0.6°C per decade.
September is about average for rainfall in Cranbrook, averaging 37 mm of rainfall. The wettest September on record was 1985 with 110 mm, while the driest was 1990 at 1 mm.
Relative humidity in Cranbrook during September averages 60%. The most humid September was 1986 at 74%, and the least humid was 1994 at 45%.
September receives about 3.9 kWh/m²/day of solar energy in Cranbrook. The sunniest September was 1990 at 4.9 kWh/m²/day, and the cloudiest was 1986 at 2.8.
Average wind speed in Cranbrook during September is 0.3 m/s. The windiest Septembers were 2008, 2009 and 2012, among others at 0.4 m/s, while the calmest were 1985 and 1986 at 0.2 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 10.0°C | 12.4°C | 11.6°C | 11.3°C | 14.0°C | +4°C |
| Avg High | 16.9°C | 19.7°C | 18.7°C | 18.1°C | 21.0°C | +4.1°C |
| Avg Low | 3.0°C | 5.0°C | 4.4°C | 4.5°C | 7.0°C | +4°C |
| Avg Rain | 45 mm | 28 mm | 37 mm | 47 mm | 26 mm | -20 mm |
September temperatures in Cranbrook have risen by about 5.2°C between 1981–1985 and 2021–2025.
September has ranged from a record low of -8.5°C (1985) to a record high of 33.2°C (2025).
Rainfall in September is about average for rainfall, averaging 37 mm, with a wettest year of 110 mm.
One of the best times to visit Cranbrook
September is one of the best times to visit Cranbrook. Expect days averaging 18.7°C and nights around 4.7°C (mean 11.7°C) — warmer than Cranbrook's yearly average — with moderate rainfall (37 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 🔥 | 23.6°C | 16.7°C | 9.8°C | 33.2°C | 3.2°C | 35 mm | 59% | 0.3 m/s | 4.1 |
| 2024 | 21.5°C | 14.6°C | 7.7°C | 30.6°C | -1.7°C | 26 mm | 61% | 0.3 m/s | 4.2 |
| 2023 | 18.6°C | 12.2°C | 5.8°C | 25.5°C | -0.5°C | 29 mm | 64% | 0.3 m/s | 3.7 |
| 2022 | 22.2°C | 14.8°C | 7.4°C | 32.6°C | -1.1°C | 16 mm | 55% | 0.3 m/s | 4.1 |
| 2021 | 19.2°C | 12.3°C | 5.3°C | 26.9°C | -1.3°C | 27 mm | 60% | 0.3 m/s | 3.9 |
| 2020 | 20.8°C | 13.4°C | 5.9°C | 28.8°C | -1.4°C | 21 mm | 62% | 0.3 m/s | 3.9 |
| 2019 | 16.2°C | 10.4°C | 4.6°C | 27.3°C | -6.1°C | 79 mm | 70% | 0.3 m/s | 3.3 |
| 2018 | 15.7°C | 9.3°C | 2.9°C | 25.5°C | -2.7°C | 41 mm | 66% | 0.3 m/s | 3.5 |
| 2017 | 19.0°C | 12.0°C | 5.1°C | 29.4°C | -1.8°C | 22 mm | 60% | 0.3 m/s | 3.7 |
| 2016 | 16.7°C | 10.3°C | 4.0°C | 24.2°C | -1.7°C | 59 mm | 68% | 0.3 m/s | 3.6 |
| 2015 | 17.2°C | 10.3°C | 3.5°C | 27.7°C | -1.0°C | 37 mm | 62% | 0.3 m/s | 3.6 |
| 2014 | 18.8°C | 11.6°C | 4.4°C | 27.5°C | -4.5°C | 44 mm | 65% | 0.3 m/s | 3.9 |
| 2013 | 18.8°C | 12.7°C | 6.6°C | 30.1°C | -2.0°C | 83 mm | 69% | 0.3 m/s | 3.4 |
| 2012 | 21.5°C | 13.4°C | 5.4°C | 27.4°C | -0.9°C | 16 mm | 56% | 0.4 m/s | 4.6 |
| 2011 | 21.4°C | 13.5°C | 5.7°C | 29.6°C | -0.7°C | 19 mm | 53% | 0.3 m/s | 4.6 |
| 2010 | 15.9°C | 9.6°C | 3.2°C | 23.4°C | -1.2°C | 68 mm | 73% | 0.3 m/s | 3.2 |
| 2009 | 22.2°C | 14.1°C | 6.1°C | 29.3°C | -1.4°C | 11 mm | 50% | 0.4 m/s | 4.5 |
| 2008 | 19.2°C | 11.9°C | 4.5°C | 28.2°C | -0.9°C | 36 mm | 57% | 0.4 m/s | 4.2 |
| 2007 | 17.6°C | 10.7°C | 3.7°C | 26.3°C | -3.4°C | 22 mm | 58% | 0.3 m/s | 4 |
| 2006 | 20.2°C | 12.8°C | 5.4°C | 31.5°C | -1.7°C | 39 mm | 57% | 0.4 m/s | 4.1 |
| 2005 | 15.7°C | 9.5°C | 3.2°C | 24.8°C | -1.6°C | 77 mm | 66% | 0.3 m/s | 3.9 |
| 2004 | 16.3°C | 10.0°C | 3.7°C | 22.9°C | -3.3°C | 55 mm | 72% | 0.3 m/s | 3.4 |
| 2003 | 19.6°C | 12.1°C | 4.6°C | 30.2°C | -3.1°C | 38 mm | 56% | 0.3 m/s | 3.9 |
| 2002 | 17.6°C | 10.9°C | 4.1°C | 26.7°C | -1.4°C | 39 mm | 61% | 0.3 m/s | 3.7 |
| 2001 | 21.7°C | 13.7°C | 5.7°C | 31.0°C | 1.3°C | 16 mm | 48% | 0.3 m/s | 4.3 |
| 2000 | 17.0°C | 10.1°C | 3.2°C | 26.9°C | -7.5°C | 34 mm | 63% | 0.3 m/s | 3.6 |
| 1999 | 18.6°C | 11.1°C | 3.5°C | 25.8°C | -3.3°C | 10 mm | 52% | 0.4 m/s | 4.3 |
| 1998 | 22.8°C | 15.2°C | 7.6°C | 30.0°C | 0.5°C | 29 mm | 53% | 0.3 m/s | 4.4 |
| 1997 | 19.3°C | 12.6°C | 5.8°C | 26.5°C | 0.4°C | 49 mm | 64% | 0.3 m/s | 4 |
| 1996 | 16.0°C | 9.4°C | 2.8°C | 28.3°C | -3.1°C | 42 mm | 67% | 0.3 m/s | 3 |
| 1995 | 20.2°C | 12.9°C | 5.5°C | 28.6°C | -3.2°C | 29 mm | 55% | 0.3 m/s | 4.2 |
| 1994 | 22.5°C | 14.6°C | 6.8°C | 27.9°C | 1.9°C | 8 mm | 45% | 0.4 m/s | 4.3 |
| 1993 | 17.9°C | 10.7°C | 3.5°C | 25.1°C | -2.3°C | 48 mm | 63% | 0.4 m/s | 4.7 |
| 1992 | 15.9°C | 9.2°C | 2.5°C | 26.0°C | -3.5°C | 36 mm | 59% | 0.3 m/s | 3.9 |
| 1991 | 20.1°C | 12.6°C | 5.0°C | 26.0°C | -0.5°C | 31 mm | 56% | 0.4 m/s | 4.4 |
| 1990 | 23.4°C | 15.4°C | 7.4°C | 27.7°C | 0.7°C | 1 mm | 48% | 0.4 m/s | 4.9 |
| 1989 | 19.0°C | 11.7°C | 4.5°C | 24.7°C | -1.0°C | 28 mm | 56% | 0.4 m/s | 4.3 |
| 1988 | 19.0°C | 11.6°C | 4.1°C | 33.1°C | -2.8°C | 42 mm | 56% | 0.3 m/s | 3.6 |
| 1987 | 22.4°C | 14.4°C | 6.5°C | 29.7°C | 1.8°C | 16 mm | 48% | 0.4 m/s | 4.4 |
| 1986 | 13.3°C | 7.3°C | 1.3°C | 23.6°C | -2.8°C | 64 mm | 74% | 0.2 m/s | 2.8 |
| 1985 ❄️ 🌧️ | 12.3°C | 6.2°C | 0.0°C | 20.0°C | -8.5°C | 110 mm | 72% | 0.2 m/s | 3.4 |
| 1984 | 14.9°C | 8.3°C | 1.7°C | 24.6°C | -6.1°C | 39 mm | 60% | 0.3 m/s | 3.7 |
| 1983 | 15.3°C | 8.4°C | 1.6°C | 22.9°C | -5.2°C | 11 mm | 62% | 0.3 m/s | — |
| 1982 | 17.5°C | 10.3°C | 3.1°C | 27.2°C | -5.0°C | 65 mm | 67% | 0.3 m/s | — |
| 1981 | 18.5°C | 11.5°C | 4.6°C | 30.2°C | -2.7°C | 32 mm | 59% | 0.3 m/s | — |
Actual recorded September data for each year, 1981–2025 — sourced from NASA POWER.
The average high in September is around 18.7°C with lows near 4.7°C (mean 11.7°C), based on 45 years of NASA POWER data.
September averages 37 mm of rainfall in Cranbrook, about average for rainfall. The wettest on record was 110 mm in 1985.
The hottest September reached 33.2°C in 2025. The coldest dipped to -8.5°C in 1985.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average September temperatures have risen by about 5.2°C. Daytime highs moved from 15.7°C to 21°C and overnight lows from 2.2°C to 7.2°C over the same span.
September is one of the warmer months of the year in Cranbrook and about average for rainfall, so plan for around 18.7°C daytime highs and 4.7°C at night.
Not quite — September is the 9th coolest month in Cranbrook, averaging 11.7°C.
For September in Cranbrook, pack warm layers and a jacket for chilly mornings, with typical highs of 18.7°C and lows of 4.7°C.
Relative humidity in September averages 60% — 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 110 mm. On average, September sees 37 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 Cranbrook 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.
