September is one of the warmer months of the year in Leduc, with average highs near 17.3°C and lows around 5.3°C (mean 11.3°C). It is about average for rainfall, averaging 43 mm of rainfall and 70% relative humidity across the period.
September is one of the warmer months of the year in Leduc. Across 45 years of records, the warmest September in Leduc was 2025 — when the month averaged 15.7°C — while the coldest was 2018 at 5.6°C. Typical September days reach 17.3°C with nights near 5.3°C. The long-term trend is warming, about 0.7°C per decade.
September is about average for rainfall in Leduc, averaging 43 mm of rainfall. The wettest September on record was 1984 with 128 mm, while the driest was 1995 at 4 mm.
Relative humidity in Leduc during September averages 70%. The most humid September was 2019 at 81%, and the least humid was 2009 at 58%.
September receives about 3.6 kWh/m²/day of solar energy in Leduc. The sunniest Septembers were 1990 and 1995 at 4.2 kWh/m²/day, and the cloudiest was 2018 at 2.6.
Average wind speed in Leduc during September is 2.6 m/s. The windiest Septembers were 1985 and 2009 at 3.2 m/s, while the calmest were 1995 and 2025 at 2.3 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 9.8°C | 11.5°C | 11.4°C | 11.2°C | 13.7°C | +3.9°C |
| Avg High | 15.5°C | 17.7°C | 17.5°C | 17.1°C | 19.8°C | +4.3°C |
| Avg Low | 4.1°C | 5.2°C | 5.3°C | 5.4°C | 7.6°C | +3.5°C |
| Avg Rain | 63 mm | 34 mm | 40 mm | 45 mm | 32 mm | -31 mm |
September temperatures in Leduc have risen by about 4.9°C between 1981–1985 and 2021–2025.
September has ranged from a record low of -6.1°C (1983) to a record high of 32°C (1981).
Rainfall in September is about average for rainfall, averaging 43 mm, with a wettest year of 128 mm.
One of the best times to visit Leduc
September is one of the best times to visit Leduc. Expect days averaging 17.3°C and nights around 5.3°C (mean 11.3°C) — warmer than Leduc's yearly average — with moderate rainfall (43 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 🔥 | 22.3°C | 15.7°C | 9.2°C | 28.8°C | 3.4°C | 29 mm | 66% | 2.3 m/s | 3.9 |
| 2024 | 20.5°C | 14.3°C | 8.2°C | 31.5°C | 1.7°C | 44 mm | 69% | 2.5 m/s | 3.9 |
| 2023 | 19.1°C | 13.3°C | 7.4°C | 24.8°C | 1.9°C | 47 mm | 69% | 2.4 m/s | 3.7 |
| 2022 | 21.3°C | 14.6°C | 7.9°C | 31.2°C | 1.8°C | 15 mm | 65% | 2.5 m/s | 3.9 |
| 2021 | 18.8°C | 12.8°C | 6.7°C | 24.1°C | 3.1°C | 35 mm | 67% | 2.8 m/s | 3.7 |
| 2020 | 16.9°C | 11.6°C | 6.2°C | 24.6°C | 0.7°C | 20 mm | 76% | 2.8 m/s | 3.5 |
| 2019 | 15.4°C | 10.8°C | 6.2°C | 22.5°C | -3.4°C | 79 mm | 81% | 2.5 m/s | 3.1 |
| 2018 ❄️ | 10.5°C | 5.6°C | 0.8°C | 24.6°C | -5.6°C | 86 mm | 80% | 2.4 m/s | 2.6 |
| 2017 | 17.7°C | 11.6°C | 5.6°C | 29.4°C | -0.9°C | 50 mm | 72% | 2.4 m/s | 3.4 |
| 2016 | 16.4°C | 10.9°C | 5.5°C | 23.2°C | 0.9°C | 51 mm | 74% | 2.5 m/s | 3.5 |
| 2015 | 15.9°C | 10.2°C | 4.6°C | 27.1°C | 0.4°C | 69 mm | 74% | 2.4 m/s | 3.4 |
| 2014 | 17.2°C | 11.3°C | 5.3°C | 26.3°C | -3.5°C | 35 mm | 72% | 2.4 m/s | 3.3 |
| 2013 | 21.4°C | 14.6°C | 7.7°C | 29.5°C | -0.6°C | 8 mm | 63% | 2.4 m/s | 4.1 |
| 2012 | 20.4°C | 13.8°C | 7.3°C | 24.9°C | 2.3°C | 16 mm | 64% | 2.8 m/s | 4 |
| 2011 | 21.0°C | 14.1°C | 7.2°C | 29.8°C | 2.0°C | 13 mm | 61% | 2.7 m/s | 4.1 |
| 2010 | 14.6°C | 9.1°C | 3.6°C | 23.2°C | -5.1°C | 47 mm | 74% | 2.4 m/s | 3.2 |
| 2009 | 22.4°C | 15.2°C | 8.0°C | 31.4°C | 0.5°C | 14 mm | 58% | 3.2 m/s | 3.9 |
| 2008 | 18.4°C | 12.0°C | 5.6°C | 26.4°C | -0.6°C | 32 mm | 66% | 2.6 m/s | 3.8 |
| 2007 | 16.7°C | 10.6°C | 4.5°C | 24.3°C | -1.9°C | 31 mm | 68% | 2.6 m/s | 3.8 |
| 2006 | 17.9°C | 12.2°C | 6.6°C | 28.4°C | -0.4°C | 72 mm | 73% | 2.6 m/s | 3.3 |
| 2005 | 15.3°C | 9.8°C | 4.3°C | 21.0°C | -0.5°C | 56 mm | 74% | 2.5 m/s | 3.3 |
| 2004 | 14.6°C | 9.4°C | 4.1°C | 22.0°C | -4.7°C | 58 mm | 78% | 2.5 m/s | 3.1 |
| 2003 | 16.7°C | 10.7°C | 4.7°C | 29.6°C | -3.2°C | 31 mm | 67% | 2.8 m/s | 3.6 |
| 2002 | 17.0°C | 10.7°C | 4.4°C | 26.7°C | -4.2°C | 22 mm | 64% | 2.6 m/s | 3.4 |
| 2001 | 19.8°C | 12.9°C | 5.9°C | 28.3°C | 2.7°C | 26 mm | 64% | 2.5 m/s | 3.6 |
| 2000 | 16.0°C | 10.2°C | 4.4°C | 23.7°C | -4.6°C | 61 mm | 74% | 2.8 m/s | 3.4 |
| 1999 | 17.6°C | 11.3°C | 5.0°C | 26.4°C | -4.3°C | 11 mm | 64% | 2.7 m/s | 4 |
| 1998 | 19.4°C | 12.7°C | 6.1°C | 30.9°C | -0.4°C | 31 mm | 63% | 2.5 m/s | 3.7 |
| 1997 | 17.7°C | 12.0°C | 6.3°C | 25.7°C | -1.6°C | 65 mm | 73% | 3 m/s | 3.5 |
| 1996 | 14.4°C | 9.5°C | 4.5°C | 26.2°C | -2.6°C | 65 mm | 75% | 2.9 m/s | 3 |
| 1995 | 19.2°C | 12.3°C | 5.3°C | 26.9°C | -3.5°C | 4 mm | 64% | 2.3 m/s | 4.2 |
| 1994 | 20.0°C | 13.5°C | 7.0°C | 26.2°C | 1.3°C | 34 mm | 66% | 2.4 m/s | 3.8 |
| 1993 | 17.0°C | 10.6°C | 4.2°C | 25.1°C | -1.9°C | 30 mm | 68% | 2.8 m/s | 3.9 |
| 1992 | 14.1°C | 8.0°C | 1.9°C | 26.2°C | -3.6°C | 66 mm | 70% | 2.9 m/s | 3.2 |
| 1991 | 17.6°C | 11.4°C | 5.1°C | 24.6°C | -2.9°C | 21 mm | 68% | 2.8 m/s | 3.7 |
| 1990 | 19.9°C | 13.2°C | 6.4°C | 25.9°C | -0.6°C | 12 mm | 65% | 2.8 m/s | 4.2 |
| 1989 | 16.8°C | 10.8°C | 4.7°C | 23.5°C | -3.5°C | 37 mm | 75% | 2.8 m/s | 4 |
| 1988 | 16.2°C | 10.4°C | 4.7°C | 29.3°C | -2.2°C | 69 mm | 73% | 2.9 m/s | 3.3 |
| 1987 | 19.5°C | 13.1°C | 6.7°C | 25.2°C | 1.6°C | 38 mm | 70% | 2.7 m/s | 4 |
| 1986 | 12.6°C | 7.5°C | 2.5°C | 18.2°C | -2.8°C | 114 mm | 78% | 2.4 m/s | 3.1 |
| 1985 | 12.5°C | 6.8°C | 1.1°C | 19.6°C | -5.7°C | 55 mm | 75% | 3.2 m/s | 3.1 |
| 1984 🌧️ | 12.2°C | 7.3°C | 2.3°C | 22.7°C | -4.6°C | 128 mm | 77% | 2.5 m/s | 3.1 |
| 1983 | 14.1°C | 8.6°C | 3.2°C | 23.3°C | -6.1°C | 47 mm | 73% | 2.7 m/s | — |
| 1982 | 16.6°C | 11.0°C | 5.5°C | 23.7°C | -1.7°C | 36 mm | 75% | 2.7 m/s | — |
| 1981 | 18.7°C | 12.4°C | 6.2°C | 32.0°C | -0.7°C | 37 mm | 67% | 2.4 m/s | — |
Actual recorded September data for each year, 1981–2025 — sourced from NASA POWER.
The average high in September is around 17.3°C with lows near 5.3°C (mean 11.3°C), based on 45 years of NASA POWER data.
September averages 43 mm of rainfall in Leduc, about average for rainfall. The wettest on record was 128 mm in 1984.
The hottest September reached 32°C in 1981. The coldest dipped to -6.1°C in 1983.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average September temperatures have risen by about 4.9°C. Daytime highs moved from 14.8°C to 20.4°C and overnight lows from 3.7°C to 7.9°C over the same span.
September is one of the warmer months of the year in Leduc and about average for rainfall, so plan for around 17.3°C daytime highs and 5.3°C at night.
Not quite — September is the 9th coolest month in Leduc, averaging 11.3°C.
For September in Leduc, pack warm layers and a jacket for chilly mornings, with typical highs of 17.3°C and lows of 5.3°C.
Relative humidity in September averages 70% — moderately humid.
Average wind speed in September is 2.6 m/s. The windiest September on record averaged 3.2 m/s (1985).
The wettest September on record was 1984 with 128 mm. On average, September sees 43 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 Leduc 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.
