September is one of the warmer months of the year in Whitecourt, with average highs near 16.7°C and lows around 4.5°C (mean 10.6°C). It is about average for rainfall, averaging 46 mm of rainfall and 72% relative humidity across the period.
September is one of the warmer months of the year in Whitecourt. Across 45 years of records, the warmest September in Whitecourt was 2025 — when the month averaged 15°C — while the coldest was 2018 at 5.2°C. Typical September days reach 16.7°C with nights near 4.5°C. The long-term trend is warming, about 0.7°C per decade.
September is about average for rainfall in Whitecourt, averaging 46 mm of rainfall. The wettest September on record was 1984 with 143 mm, while the driest was 2013 at 7 mm.
Relative humidity in Whitecourt during September averages 72%. The most humid September was 2019 at 84%, and the least humid was 2009 at 62%.
September receives about 3.4 kWh/m²/day of solar energy in Whitecourt. The sunniest September was 1990 at 4.1 kWh/m²/day, and the cloudiest was 2018 at 2.7.
Average wind speed in Whitecourt during September is 0.8 m/s. The windiest Septembers were 1985 and 2009 at 1 m/s, while the calmest were 1995, 2023 and 2025 at 0.7 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 9.0°C | 10.7°C | 10.6°C | 10.6°C | 13.0°C | +4°C |
| Avg High | 14.6°C | 17.0°C | 16.7°C | 16.6°C | 19.4°C | +4.8°C |
| Avg Low | 3.3°C | 4.3°C | 4.4°C | 4.6°C | 6.6°C | +3.3°C |
| Avg Rain | 71 mm | 38 mm | 41 mm | 45 mm | 31 mm | -41 mm |
September temperatures in Whitecourt have risen by about 5.1°C between 1981–1985 and 2021–2025.
September has ranged from a record low of -6.3°C (1983) to a record high of 33°C (1988).
Rainfall in September is about average for rainfall, averaging 46 mm, with a wettest year of 143 mm.
Daytime highs and overnight lows have shifted differently — highs rose about 0.8°C per decade while lows rose 0.6°C per decade, widening the gap between day and night.
One of the best times to visit Whitecourt
September is one of the best times to visit Whitecourt. Expect days averaging 16.7°C and nights around 4.5°C (mean 10.6°C) — warmer than Whitecourt's yearly average — with moderate rainfall (46 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 🔥 | 21.9°C | 15.0°C | 8.1°C | 28.1°C | 1.4°C | 28 mm | 67% | 0.7 m/s | 3.6 |
| 2024 | 19.7°C | 13.3°C | 7.0°C | 32.3°C | 0.4°C | 42 mm | 68% | 0.8 m/s | 3.6 |
| 2023 | 18.3°C | 12.1°C | 5.8°C | 26.0°C | 0.6°C | 37 mm | 71% | 0.7 m/s | 3.8 |
| 2022 | 21.1°C | 14.2°C | 7.2°C | 32.9°C | 1.6°C | 29 mm | 65% | 0.8 m/s | 3.8 |
| 2021 | 18.5°C | 12.2°C | 5.9°C | 25.0°C | 1.8°C | 30 mm | 66% | 0.9 m/s | 3.6 |
| 2020 | 17.1°C | 11.4°C | 5.7°C | 26.1°C | -0.5°C | 17 mm | 73% | 0.9 m/s | 3.3 |
| 2019 | 14.5°C | 9.9°C | 5.4°C | 24.0°C | -4.9°C | 101 mm | 84% | 0.8 m/s | 3 |
| 2018 ❄️ | 10.1°C | 5.2°C | 0.2°C | 25.2°C | -6.1°C | 53 mm | 79% | 0.8 m/s | 2.7 |
| 2017 | 17.6°C | 11.3°C | 5.1°C | 30.4°C | -1.6°C | 58 mm | 72% | 0.8 m/s | 3.2 |
| 2016 | 15.9°C | 10.2°C | 4.5°C | 22.8°C | 0.0°C | 42 mm | 74% | 0.8 m/s | 3.4 |
| 2015 | 15.2°C | 9.5°C | 3.7°C | 28.6°C | -0.6°C | 56 mm | 75% | 0.8 m/s | 3.1 |
| 2014 | 17.0°C | 10.8°C | 4.6°C | 26.9°C | -4.7°C | 52 mm | 74% | 0.8 m/s | 3.2 |
| 2013 | 21.4°C | 14.2°C | 6.9°C | 31.4°C | -0.8°C | 7 mm | 63% | 0.8 m/s | 4 |
| 2012 | 20.2°C | 13.3°C | 6.4°C | 26.7°C | 2.2°C | 13 mm | 62% | 0.9 m/s | 3.9 |
| 2011 | 20.4°C | 13.3°C | 6.2°C | 30.2°C | 0.0°C | 19 mm | 63% | 0.8 m/s | 3.9 |
| 2010 | 13.8°C | 8.2°C | 2.6°C | 22.5°C | -4.8°C | 50 mm | 76% | 0.8 m/s | 3.3 |
| 2009 | 21.0°C | 14.0°C | 6.9°C | 30.1°C | 0.2°C | 27 mm | 62% | 1 m/s | 3.7 |
| 2008 | 17.9°C | 11.3°C | 4.7°C | 25.6°C | -2.9°C | 38 mm | 68% | 0.8 m/s | 3.5 |
| 2007 | 16.5°C | 10.1°C | 3.6°C | 24.0°C | -2.8°C | 17 mm | 67% | 0.9 m/s | 3.5 |
| 2006 | 17.9°C | 12.0°C | 6.1°C | 30.4°C | -1.2°C | 68 mm | 72% | 0.8 m/s | 3.3 |
| 2005 | 14.8°C | 9.1°C | 3.4°C | 21.2°C | -0.1°C | 48 mm | 73% | 0.8 m/s | 3.3 |
| 2004 | 12.9°C | 8.0°C | 3.1°C | 19.6°C | -4.9°C | 91 mm | 83% | 0.8 m/s | 2.8 |
| 2003 | 16.8°C | 10.5°C | 4.1°C | 30.2°C | -3.5°C | 26 mm | 65% | 0.9 m/s | 3.4 |
| 2002 | 15.8°C | 9.6°C | 3.4°C | 25.3°C | -2.7°C | 22 mm | 68% | 0.9 m/s | 3.3 |
| 2001 | 18.5°C | 11.6°C | 4.8°C | 27.1°C | 1.4°C | 12 mm | 68% | 0.8 m/s | 3.7 |
| 2000 | 15.3°C | 9.5°C | 3.8°C | 22.6°C | -5.9°C | 63 mm | 76% | 0.9 m/s | 3.2 |
| 1999 | 17.7°C | 10.9°C | 4.1°C | 25.7°C | -5.1°C | 23 mm | 63% | 0.8 m/s | 3.7 |
| 1998 | 18.4°C | 11.8°C | 5.2°C | 28.2°C | -1.4°C | 26 mm | 65% | 0.8 m/s | 3.5 |
| 1997 | 17.0°C | 11.1°C | 5.2°C | 27.4°C | -2.0°C | 48 mm | 75% | 0.9 m/s | 3.4 |
| 1996 | 12.9°C | 8.1°C | 3.3°C | 24.6°C | -2.8°C | 86 mm | 82% | 0.8 m/s | 2.9 |
| 1995 | 19.0°C | 12.0°C | 5.0°C | 26.7°C | -3.6°C | 11 mm | 67% | 0.7 m/s | 4 |
| 1994 | 19.5°C | 12.8°C | 6.0°C | 26.2°C | 0.6°C | 34 mm | 66% | 0.8 m/s | 3.7 |
| 1993 | 16.6°C | 10.2°C | 3.9°C | 24.7°C | -3.5°C | 27 mm | 69% | 0.8 m/s | 3.7 |
| 1992 | 12.9°C | 7.0°C | 1.0°C | 24.1°C | -5.1°C | 75 mm | 73% | 0.9 m/s | 3 |
| 1991 | 17.1°C | 10.9°C | 4.6°C | 23.0°C | -1.4°C | 25 mm | 70% | 0.9 m/s | 3.5 |
| 1990 | 18.8°C | 12.0°C | 5.1°C | 24.7°C | -1.8°C | 26 mm | 70% | 0.8 m/s | 4.1 |
| 1989 | 15.9°C | 9.8°C | 3.8°C | 22.2°C | -2.8°C | 30 mm | 80% | 0.8 m/s | 3.6 |
| 1988 | 15.7°C | 9.8°C | 3.8°C | 33.0°C | -3.4°C | 71 mm | 74% | 0.8 m/s | 3.2 |
| 1987 | 19.6°C | 12.9°C | 6.1°C | 26.0°C | 1.3°C | 32 mm | 68% | 0.8 m/s | 3.8 |
| 1986 | 11.7°C | 6.9°C | 2.1°C | 19.5°C | -4.4°C | 130 mm | 83% | 0.8 m/s | 3 |
| 1985 | 11.3°C | 5.8°C | 0.3°C | 18.8°C | -6.3°C | 86 mm | 80% | 1 m/s | 3 |
| 1984 🌧️ | 11.2°C | 6.4°C | 1.5°C | 21.9°C | -5.0°C | 143 mm | 81% | 0.8 m/s | 3.1 |
| 1983 | 12.9°C | 7.5°C | 2.2°C | 22.3°C | -6.3°C | 74 mm | 77% | 0.8 m/s | — |
| 1982 | 15.4°C | 10.1°C | 4.8°C | 22.2°C | -3.6°C | 36 mm | 80% | 0.8 m/s | — |
| 1981 | 18.1°C | 11.6°C | 5.2°C | 31.9°C | -1.1°C | 41 mm | 70% | 0.8 m/s | — |
Actual recorded September data for each year, 1981–2025 — sourced from NASA POWER.
The average high in September is around 16.7°C with lows near 4.5°C (mean 10.6°C), based on 45 years of NASA POWER data.
September averages 46 mm of rainfall in Whitecourt, about average for rainfall. The wettest on record was 143 mm in 1984.
The hottest September reached 33°C in 1988. The coldest dipped to -6.3°C in 1983.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average September temperatures have risen by about 5.1°C. Daytime highs moved from 13.8°C to 19.9°C and overnight lows from 2.8°C to 6.8°C over the same span.
September is one of the warmer months of the year in Whitecourt and about average for rainfall, so plan for around 16.7°C daytime highs and 4.5°C at night.
Not quite — September is the 9th coolest month in Whitecourt, averaging 10.6°C.
For September in Whitecourt, pack warm layers and a jacket for chilly mornings, with typical highs of 16.7°C and lows of 4.5°C.
Relative humidity in September averages 72% — moderately humid.
Average wind speed in September is 0.8 m/s. The windiest September on record averaged 1 m/s (1985).
The wettest September on record was 1984 with 143 mm. On average, September sees 46 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 Whitecourt 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.
