September is one of the warmer months of the year in Vernon, with average highs near 18.9°C and lows around 5.6°C (mean 12.3°C). It is one of the drier months, averaging 41 mm of rainfall and 64% relative humidity across the period.
September is one of the warmer months of the year in Vernon. Across 45 years of records, the warmest September in Vernon was 2025 — when the month averaged 16°C — while the coldest was 1985 at 8.4°C. Typical September days reach 18.9°C with nights near 5.6°C. The long-term trend is warming, about 0.4°C per decade.
September is one of the drier months in Vernon, averaging 41 mm of rainfall. The wettest September on record was 2019 with 107 mm, while the driest was 1990 at 5 mm.
Relative humidity in Vernon during September averages 64%. The most humid September was 2019 at 76%, and the least humid was 1987 at 50%.
September receives about 3.8 kWh/m²/day of solar energy in Vernon. The sunniest Septembers were 1990 and 1995 at 4.6 kWh/m²/day, and the cloudiest were 2010 and 2019 at 3.1.
Average wind speed in Vernon during September is 0.3 m/s. The windiest Septembers were 2022, 2023 and 2025, among others at 0.3 m/s, while the calmest were 2019, 2021 and 2024, 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 | 11.0°C | 12.9°C | 11.9°C | 12.0°C | 13.9°C | +2.9°C |
| Avg High | 17.6°C | 20.0°C | 18.7°C | 18.3°C | 20.3°C | +2.7°C |
| Avg Low | 4.5°C | 5.7°C | 5.2°C | 5.7°C | 7.5°C | +3°C |
| Avg Rain | 47 mm | 29 mm | 36 mm | 55 mm | 36 mm | -11 mm |
September temperatures in Vernon have risen by about 3.9°C between 1981–1985 and 2021–2025.
September has ranged from a record low of -3.7°C (1992) to a record high of 34.9°C (1988).
Rainfall in September is one of the drier months, averaging 41 mm, with a wettest year of 107 mm.
Daytime highs and overnight lows have shifted differently — highs rose about 0.3°C per decade while lows rose 0.6°C per decade, narrowing the gap between day and night.
One of the best times to visit Vernon
September is one of the best times to visit Vernon. Expect days averaging 18.9°C and nights around 5.6°C (mean 12.3°C) — warmer than Vernon's yearly average — with moderate rainfall (41 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 | 16.0°C | 9.6°C | 32.5°C | 4.7°C | 41 mm | 71% | 0.3 m/s | 4 |
| 2024 | 19.9°C | 13.8°C | 7.6°C | 32.4°C | -1.3°C | 44 mm | 67% | 0.2 m/s | 3.7 |
| 2023 | 19.6°C | 13.1°C | 6.6°C | 28.1°C | 1.7°C | 38 mm | 65% | 0.3 m/s | 3.7 |
| 2022 | 22.1°C | 14.8°C | 7.6°C | 31.9°C | 3.0°C | 11 mm | 61% | 0.3 m/s | 4 |
| 2021 | 17.7°C | 11.8°C | 6.0°C | 27.1°C | -1.2°C | 52 mm | 70% | 0.2 m/s | 3.3 |
| 2020 | 20.0°C | 13.9°C | 7.8°C | 27.8°C | 2.4°C | 29 mm | 71% | 0.3 m/s | 3.8 |
| 2019 🌧️ | 16.2°C | 11.2°C | 6.2°C | 28.7°C | -1.6°C | 107 mm | 76% | 0.2 m/s | 3.1 |
| 2018 | 15.2°C | 9.9°C | 4.5°C | 25.6°C | 0.2°C | 76 mm | 72% | 0.3 m/s | 3.4 |
| 2017 | 19.7°C | 13.1°C | 6.6°C | 29.9°C | 0.4°C | 23 mm | 63% | 0.3 m/s | 3.6 |
| 2016 | 16.4°C | 10.7°C | 5.0°C | 24.5°C | 1.4°C | 60 mm | 72% | 0.3 m/s | 3.5 |
| 2015 | 16.4°C | 10.3°C | 4.1°C | 27.4°C | -0.8°C | 61 mm | 69% | 0.3 m/s | 3.5 |
| 2014 | 19.5°C | 12.8°C | 6.0°C | 27.4°C | -1.7°C | 47 mm | 64% | 0.3 m/s | 3.9 |
| 2013 | 19.8°C | 13.5°C | 7.3°C | 29.9°C | -0.3°C | 68 mm | 70% | 0.2 m/s | 3.6 |
| 2012 | 22.0°C | 14.2°C | 6.4°C | 27.5°C | 1.0°C | 10 mm | 53% | 0.3 m/s | 4.4 |
| 2011 | 21.7°C | 14.2°C | 6.7°C | 30.0°C | 1.5°C | 18 mm | 58% | 0.3 m/s | 4.1 |
| 2010 | 16.2°C | 10.4°C | 4.6°C | 26.2°C | -0.5°C | 79 mm | 74% | 0.2 m/s | 3.1 |
| 2009 | 21.6°C | 14.1°C | 6.6°C | 30.1°C | 0.9°C | 27 mm | 59% | 0.3 m/s | 4.2 |
| 2008 | 19.2°C | 12.1°C | 5.0°C | 27.3°C | 1.3°C | 31 mm | 59% | 0.3 m/s | 4 |
| 2007 | 16.8°C | 10.8°C | 4.7°C | 28.2°C | -0.6°C | 49 mm | 66% | 0.3 m/s | 3.6 |
| 2006 | 20.7°C | 13.5°C | 6.3°C | 31.4°C | 0.2°C | 36 mm | 61% | 0.3 m/s | 3.9 |
| 2005 | 16.3°C | 10.1°C | 4.0°C | 23.6°C | -1.5°C | 44 mm | 68% | 0.3 m/s | 3.5 |
| 2004 | 16.1°C | 10.4°C | 4.7°C | 21.8°C | -1.8°C | 54 mm | 73% | 0.2 m/s | 3.2 |
| 2003 | 20.4°C | 13.1°C | 5.8°C | 32.4°C | 1.6°C | 27 mm | 55% | 0.3 m/s | 3.7 |
| 2002 | 18.4°C | 11.6°C | 4.8°C | 27.6°C | 0.0°C | 30 mm | 62% | 0.3 m/s | 3.7 |
| 2001 | 20.4°C | 13.1°C | 5.8°C | 27.8°C | 2.2°C | 22 mm | 57% | 0.3 m/s | 4.2 |
| 2000 | 16.8°C | 10.5°C | 4.2°C | 25.5°C | -3.4°C | 41 mm | 67% | 0.3 m/s | 3.6 |
| 1999 | 18.3°C | 11.3°C | 4.3°C | 26.8°C | -1.5°C | 28 mm | 60% | 0.3 m/s | 4 |
| 1998 | 22.9°C | 15.3°C | 7.7°C | 29.9°C | 1.8°C | 18 mm | 54% | 0.3 m/s | 4.2 |
| 1997 | 19.1°C | 12.6°C | 6.1°C | 26.3°C | -0.1°C | 74 mm | 69% | 0.3 m/s | 3.6 |
| 1996 | 16.6°C | 10.5°C | 4.3°C | 28.9°C | -1.3°C | 49 mm | 66% | 0.3 m/s | 3.3 |
| 1995 | 21.8°C | 14.3°C | 6.7°C | 29.5°C | 1.0°C | 25 mm | 54% | 0.3 m/s | 4.6 |
| 1994 | 21.8°C | 14.3°C | 6.9°C | 28.2°C | 2.5°C | 23 mm | 57% | 0.3 m/s | 4.1 |
| 1993 | 20.3°C | 12.8°C | 5.3°C | 27.7°C | -1.4°C | 15 mm | 55% | 0.3 m/s | 4.5 |
| 1992 | 16.4°C | 9.6°C | 2.9°C | 24.5°C | -3.7°C | 52 mm | 66% | 0.2 m/s | 3.3 |
| 1991 | 20.3°C | 13.1°C | 5.9°C | 26.8°C | 0.4°C | 5 mm | 59% | 0.3 m/s | 4.4 |
| 1990 | 22.6°C | 14.7°C | 6.7°C | 27.5°C | 3.6°C | 5 mm | 55% | 0.3 m/s | 4.6 |
| 1989 | 19.9°C | 12.7°C | 5.5°C | 25.8°C | -0.4°C | 32 mm | 61% | 0.3 m/s | 4.3 |
| 1988 | 18.9°C | 12.0°C | 5.1°C | 34.9°C | -2.0°C | 55 mm | 63% | 0.2 m/s | 3.5 |
| 1987 | 22.8°C | 14.8°C | 6.7°C | 30.4°C | 1.4°C | 16 mm | 50% | 0.3 m/s | 4.4 |
| 1986 | 15.3°C | 9.5°C | 3.7°C | 23.0°C | -1.5°C | 68 mm | 68% | 0.3 m/s | 3.6 |
| 1985 ❄️ | 14.3°C | 8.4°C | 2.6°C | 20.5°C | -2.1°C | 74 mm | 68% | 0.3 m/s | 3.6 |
| 1984 | 15.5°C | 9.2°C | 3.0°C | 24.4°C | -3.0°C | 37 mm | 64% | 0.3 m/s | 3.4 |
| 1983 | 15.2°C | 8.9°C | 2.7°C | 21.4°C | -3.2°C | 47 mm | 65% | 0.3 m/s | — |
| 1982 | 17.9°C | 11.8°C | 5.7°C | 28.1°C | 0.1°C | 51 mm | 71% | 0.3 m/s | — |
| 1981 | 18.5°C | 11.8°C | 5.1°C | 30.8°C | -2.1°C | 43 mm | 67% | 0.3 m/s | — |
Actual recorded September data for each year, 1981–2025 — sourced from NASA POWER.
The average high in September is around 18.9°C with lows near 5.6°C (mean 12.3°C), based on 45 years of NASA POWER data.
September averages 41 mm of rainfall in Vernon, one of the drier months. The wettest on record was 107 mm in 2019.
The hottest September reached 34.9°C in 1988. The coldest dipped to -3.7°C in 1992.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average September temperatures have risen by about 3.9°C. Daytime highs moved from 16.3°C to 20.3°C and overnight lows from 3.8°C to 7.5°C over the same span.
September is one of the warmer months of the year in Vernon and one of the drier months, so plan for around 18.9°C daytime highs and 5.6°C at night.
Not quite — September is the 9th coolest month in Vernon, averaging 12.3°C.
For September in Vernon, pack warm layers and a jacket for chilly mornings, with typical highs of 18.9°C and lows of 5.6°C.
Relative humidity in September averages 64% — moderately humid.
Average wind speed in September is 0.3 m/s. The windiest September on record averaged 0.3 m/s (1981).
The wettest September on record was 2019 with 107 mm. On average, September sees 41 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 Vernon 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.
