September is one of the warmer months of the year in Whitehorse, with average highs near 7.8°C and lows around -0.3°C (mean 3.8°C). It is a relatively wet time of year, averaging 62 mm of rainfall and 85% relative humidity across the period.
September is one of the warmer months of the year in Whitehorse. Across 45 years of records, the warmest September in Whitehorse was 1995 — when the month averaged 6.9°C — while the coldest was 1992 at -1.1°C. Typical September days reach 7.8°C with nights near -0.3°C. The long-term trend is warming, about 0.3°C per decade.
September is a relatively wet time of year in Whitehorse, averaging 62 mm of rainfall. The wettest September on record was 2014 with 132 mm, while the driest was 2018 at 25 mm.
Relative humidity in Whitehorse during September averages 85%. The most humid September was 2014 at 90%, and the least humid was 2018 at 78%.
September receives about 2.5 kWh/m²/day of solar energy in Whitehorse. The sunniest September was 2018 at 3 kWh/m²/day, and the cloudiest was 2023 at 2.1.
Average wind speed in Whitehorse during September is 1.4 m/s. The windiest September was 1990 at 1.8 m/s, while the calmest was 1984 at 1 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 3.3°C | 3.6°C | 3.4°C | 4.1°C | 4.6°C | +1.3°C |
| Avg High | 7.6°C | 7.7°C | 7.3°C | 8.1°C | 8.5°C | +0.9°C |
| Avg Low | -1.0°C | -0.5°C | -0.5°C | 0.0°C | 0.7°C | +1.7°C |
| Avg Rain | 60 mm | 62 mm | 65 mm | 62 mm | 59 mm | -1 mm |
September temperatures in Whitehorse have risen by about 1.6°C between 1981–1985 and 2021–2025.
September has ranged from a record low of -13.6°C (1983) to a record high of 21°C (2025).
Rainfall in September is a relatively wet time of year, averaging 62 mm, with a wettest year of 132 mm.
One of the best times to visit Whitehorse
September is one of the best times to visit Whitehorse. Expect days averaging 7.8°C and nights around -0.3°C (mean 3.8°C) — warmer than Whitehorse's yearly average — with moderate rainfall (62 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 | 10.8°C | 6.6°C | 2.4°C | 21.0°C | -2.7°C | 63 mm | 85% | 1.3 m/s | 2.7 |
| 2024 | 7.7°C | 4.0°C | 0.3°C | 11.4°C | -2.8°C | 58 mm | 86% | 1.2 m/s | 2.4 |
| 2023 | 8.2°C | 4.6°C | 1.0°C | 13.5°C | -2.5°C | 56 mm | 86% | 1.3 m/s | 2.1 |
| 2022 | 9.2°C | 5.1°C | 1.0°C | 12.5°C | -1.4°C | 62 mm | 86% | 1.5 m/s | 2.6 |
| 2021 | 6.9°C | 3.3°C | -0.2°C | 14.3°C | -8.0°C | 75 mm | 89% | 1.2 m/s | 2.2 |
| 2020 | 8.3°C | 4.1°C | -0.1°C | 13.5°C | -3.8°C | 41 mm | 85% | 1.3 m/s | 2.6 |
| 2019 | 10.3°C | 6.0°C | 1.6°C | 16.6°C | -4.7°C | 43 mm | 82% | 1.2 m/s | 2.9 |
| 2018 | 8.1°C | 3.4°C | -1.3°C | 12.2°C | -4.4°C | 25 mm | 78% | 1.1 m/s | 3 |
| 2017 | 9.8°C | 5.5°C | 1.1°C | 19.2°C | -3.7°C | 60 mm | 86% | 1.2 m/s | 2.7 |
| 2016 | 8.2°C | 4.2°C | 0.2°C | 12.9°C | -5.4°C | 47 mm | 84% | 1.3 m/s | 2.5 |
| 2015 | 6.2°C | 2.6°C | -0.9°C | 11.6°C | -4.4°C | 49 mm | 87% | 1.4 m/s | 2.2 |
| 2014 🌧️ | 7.5°C | 3.6°C | -0.2°C | 13.6°C | -5.3°C | 132 mm | 90% | 1.3 m/s | 2.4 |
| 2013 | 8.9°C | 5.2°C | 1.5°C | 15.2°C | -3.5°C | 84 mm | 87% | 1.4 m/s | 2.4 |
| 2012 | 7.6°C | 3.5°C | -0.6°C | 17.1°C | -3.9°C | 53 mm | 85% | 1.7 m/s | 2.5 |
| 2011 | 7.0°C | 3.2°C | -0.5°C | 12.4°C | -5.8°C | 61 mm | 86% | 1.5 m/s | 2.4 |
| 2010 | 7.9°C | 3.7°C | -0.5°C | 13.2°C | -7.5°C | 62 mm | 84% | 1.1 m/s | 2.5 |
| 2009 | 7.7°C | 3.9°C | 0.1°C | 14.3°C | -6.9°C | 68 mm | 87% | 1.3 m/s | 2.3 |
| 2008 | 7.1°C | 3.2°C | -0.6°C | 12.0°C | -3.2°C | 60 mm | 89% | 1.3 m/s | 2.3 |
| 2007 | 7.7°C | 3.7°C | -0.4°C | 15.2°C | -4.6°C | 70 mm | 86% | 1.3 m/s | 2.3 |
| 2006 | 7.8°C | 3.8°C | -0.3°C | 14.3°C | -4.0°C | 56 mm | 86% | 1.4 m/s | 2.5 |
| 2005 | 8.1°C | 4.3°C | 0.5°C | 12.3°C | -3.0°C | 54 mm | 87% | 1.4 m/s | 2.4 |
| 2004 | 6.0°C | 2.1°C | -1.8°C | 14.5°C | -4.8°C | 58 mm | 81% | 1.5 m/s | 2.4 |
| 2003 | 6.5°C | 2.5°C | -1.4°C | 13.5°C | -8.8°C | 81 mm | 86% | 1.3 m/s | 2.2 |
| 2002 | 8.2°C | 3.8°C | -0.6°C | 14.9°C | -3.6°C | 42 mm | 84% | 1.2 m/s | 2.8 |
| 2001 | 7.8°C | 3.9°C | -0.1°C | 12.3°C | -2.5°C | 67 mm | 87% | 1.4 m/s | 2.5 |
| 2000 | 6.5°C | 2.8°C | -0.9°C | 10.8°C | -8.2°C | 91 mm | 88% | 1.5 m/s | 2.5 |
| 1999 | 7.3°C | 3.2°C | -0.9°C | 12.5°C | -4.8°C | 56 mm | 84% | 1.5 m/s | 2.5 |
| 1998 | 7.6°C | 3.3°C | -1.0°C | 13.5°C | -3.4°C | 45 mm | 83% | 1.3 m/s | 2.6 |
| 1997 | 9.2°C | 5.0°C | 0.8°C | 13.9°C | -3.1°C | 52 mm | 84% | 1.3 m/s | 2.6 |
| 1996 | 6.4°C | 2.3°C | -1.8°C | 13.7°C | -7.9°C | 45 mm | 82% | 1.4 m/s | 2.6 |
| 1995 🔥 | 11.7°C | 6.9°C | 2.0°C | 17.4°C | -4.1°C | 41 mm | 81% | 1.4 m/s | 2.6 |
| 1994 | 7.0°C | 3.2°C | -0.5°C | 12.2°C | -5.7°C | 71 mm | 81% | 1.5 m/s | 2.4 |
| 1993 | 9.0°C | 4.5°C | 0.1°C | 17.6°C | -5.0°C | 44 mm | 82% | 1.6 m/s | 2.7 |
| 1992 ❄️ | 2.6°C | -1.1°C | -4.8°C | 8.8°C | -9.6°C | 118 mm | 88% | 1.3 m/s | 2.3 |
| 1991 | 7.8°C | 4.1°C | 0.4°C | 12.0°C | -3.2°C | 78 mm | 89% | 1.4 m/s | 2.2 |
| 1990 | 8.6°C | 4.5°C | 0.4°C | 13.2°C | -4.0°C | 65 mm | 83% | 1.8 m/s | 2.3 |
| 1989 | 9.8°C | 5.2°C | 0.6°C | 19.2°C | -5.7°C | 52 mm | 83% | 1.3 m/s | 2.5 |
| 1988 | 6.7°C | 2.4°C | -1.9°C | 17.0°C | -5.7°C | 51 mm | 83% | 1.3 m/s | 2.6 |
| 1987 | 7.1°C | 3.3°C | -0.5°C | 12.1°C | -4.4°C | 56 mm | 87% | 1.6 m/s | 2.4 |
| 1986 | 8.2°C | 3.6°C | -1.1°C | 16.2°C | -10.4°C | 60 mm | 81% | 1.3 m/s | 2.8 |
| 1985 | 7.7°C | 3.1°C | -1.5°C | 14.0°C | -6.1°C | 58 mm | 81% | 1.5 m/s | 2.5 |
| 1984 | 7.5°C | 3.4°C | -0.8°C | 10.5°C | -2.5°C | 53 mm | 84% | 1 m/s | 2.7 |
| 1983 | 5.3°C | 1.3°C | -2.7°C | 12.4°C | -13.6°C | 64 mm | 82% | 1.4 m/s | — |
| 1982 | 9.0°C | 4.4°C | -0.1°C | 15.0°C | -3.7°C | 60 mm | 84% | 1.3 m/s | — |
| 1981 | 7.0°C | 3.2°C | -0.6°C | 11.9°C | -5.8°C | 92 mm | 85% | 1.4 m/s | — |
Actual recorded September data for each year, 1981–2025 — sourced from NASA POWER.
The average high in September is around 7.8°C with lows near -0.3°C (mean 3.8°C), based on 45 years of NASA POWER data.
September averages 62 mm of rainfall in Whitehorse, a relatively wet time of year. The wettest on record was 132 mm in 2014.
The hottest September reached 21°C in 2025. The coldest dipped to -13.6°C in 1983.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average September temperatures have risen by about 1.6°C. Daytime highs moved from 7.3°C to 8.6°C and overnight lows from -1.1°C to 0.9°C over the same span.
September is one of the warmer months of the year in Whitehorse and a relatively wet time of year, so plan for around 7.8°C daytime highs and -0.3°C at night.
Not quite — September is the 9th coolest month in Whitehorse, averaging 3.8°C.
For September in Whitehorse, pack warm layers and a jacket for chilly mornings, with typical highs of 7.8°C and lows of -0.3°C. Bring an umbrella or light rain jacket too.
Relative humidity in September averages 85% — quite humid.
Average wind speed in September is 1.4 m/s. The windiest September on record averaged 1.8 m/s (1990).
The wettest September on record was 2014 with 132 mm. On average, September sees 62 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 Whitehorse 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.
