September is one of the cooler months of the year in Bicheno, with average highs near 13.3°C and lows around 6°C (mean 9.7°C). It is about average for rainfall, averaging 50 mm of rainfall and 79% relative humidity across the period.
September is one of the cooler months of the year in Bicheno. Across 45 years of records, the warmest September in Bicheno was 2023 — when the month averaged 11.5°C — while the coldest was 1992 at 7.8°C. Typical September days reach 13.3°C with nights near 6°C. The long-term trend is warming, about 0.3°C per decade.
September is about average for rainfall in Bicheno, averaging 50 mm of rainfall. The wettest September on record was 2009 with 135 mm, while the driest was 2023 at 18 mm.
Relative humidity in Bicheno during September averages 79%. The most humid September was 1984 at 85%, and the least humid was 2025 at 72%.
September receives about 4 kWh/m²/day of solar energy in Bicheno. The sunniest Septembers were 2014 and 2018 at 4.4 kWh/m²/day, and the cloudiest were 2009 and 2016 at 3.5.
Average wind speed in Bicheno during September is 2.9 m/s. The windiest September was 2002 at 3.7 m/s, while the calmest were 2004 and 2016 at 2.2 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 9.4°C | 9.1°C | 9.9°C | 9.9°C | 10.1°C | +0.7°C |
| Avg High | 13.0°C | 12.7°C | 13.5°C | 13.8°C | 13.8°C | +0.8°C |
| Avg Low | 5.8°C | 5.5°C | 6.2°C | 6.1°C | 6.4°C | +0.6°C |
| Avg Rain | 58 mm | 49 mm | 57 mm | 44 mm | 42 mm | -16 mm |
September temperatures in Bicheno have risen by about 1°C between 1981–1985 and 2021–2025.
September has ranged from a record low of 1.3°C (1996) to a record high of 22.2°C (1987).
Rainfall in September is about average for rainfall, averaging 50 mm, with a wettest year of 135 mm.
A quieter season to visit Bicheno
If your dates are flexible, the more temperate months of February and January tend to be the most comfortable for visiting Bicheno. That said, September — with days averaging 13.3°C and nights around 6°C (mean 9.7°C) and moderate rainfall (50 mm) — can still be rewarding for travellers who don't mind the cooler conditions, and often means fewer crowds.
| Year | Avg High | Avg Temp | Avg Low | Hottest Day | Coldest Day | Rainfall | Humidity | Wind | Solar |
|---|---|---|---|---|---|---|---|---|---|
| 2025 | 13.7°C | 10.1°C | 6.6°C | 17.4°C | 2.4°C | 37 mm | 72% | 3.6 m/s | 4.1 |
| 2024 | 13.9°C | 10.1°C | 6.3°C | 17.6°C | 3.1°C | 45 mm | 75% | 3.5 m/s | 3.9 |
| 2023 🔥 | 15.8°C | 11.5°C | 7.1°C | 21.6°C | 3.9°C | 18 mm | 73% | 2.8 m/s | 4.3 |
| 2022 | 12.8°C | 9.6°C | 6.4°C | 18.8°C | 2.2°C | 92 mm | 84% | 2.4 m/s | 3.8 |
| 2021 | 13.4°C | 9.6°C | 5.9°C | 20.1°C | 2.5°C | 35 mm | 77% | 3.1 m/s | 4.2 |
| 2020 | 13.4°C | 9.8°C | 6.1°C | 18.8°C | 2.6°C | 23 mm | 80% | 2.9 m/s | 3.9 |
| 2019 | 14.1°C | 9.8°C | 5.6°C | 19.6°C | 2.0°C | 61 mm | 76% | 2.7 m/s | 4.1 |
| 2018 | 14.0°C | 9.9°C | 5.9°C | 18.6°C | 2.1°C | 21 mm | 75% | 2.7 m/s | 4.4 |
| 2017 | 13.3°C | 9.2°C | 5.2°C | 17.9°C | 2.2°C | 28 mm | 74% | 3.2 m/s | 4 |
| 2016 | 13.5°C | 10.3°C | 7.1°C | 17.6°C | 4.1°C | 88 mm | 83% | 2.2 m/s | 3.5 |
| 2015 | 14.1°C | 10.2°C | 6.3°C | 21.1°C | 2.7°C | 23 mm | 79% | 2.3 m/s | 4.1 |
| 2014 | 15.2°C | 10.9°C | 6.6°C | 21.0°C | 3.6°C | 21 mm | 75% | 2.7 m/s | 4.4 |
| 2013 | 13.7°C | 10.5°C | 7.2°C | 17.7°C | 1.9°C | 66 mm | 80% | 2.8 m/s | 3.6 |
| 2012 | 13.7°C | 10.1°C | 6.5°C | 18.5°C | 3.4°C | 55 mm | 79% | 3 m/s | 3.9 |
| 2011 | 13.5°C | 9.5°C | 5.5°C | 16.9°C | 2.4°C | 32 mm | 80% | 2.9 m/s | 4.1 |
| 2010 | 12.4°C | 8.7°C | 5.1°C | 16.4°C | 1.8°C | 41 mm | 77% | 3.3 m/s | 4.1 |
| 2009 🌧️ | 12.8°C | 9.7°C | 6.5°C | 16.5°C | 4.7°C | 135 mm | 84% | 3.2 m/s | 3.5 |
| 2008 | 13.9°C | 9.6°C | 5.3°C | 17.9°C | 2.2°C | 45 mm | 74% | 3.3 m/s | 4 |
| 2007 | 13.8°C | 10.1°C | 6.4°C | 16.3°C | 3.3°C | 27 mm | 79% | 3 m/s | 3.9 |
| 2006 | 14.4°C | 10.3°C | 6.2°C | 19.4°C | 3.5°C | 42 mm | 74% | 2.9 m/s | 4.3 |
| 2005 | 13.7°C | 10.1°C | 6.6°C | 18.4°C | 3.4°C | 98 mm | 82% | 2.4 m/s | 3.7 |
| 2004 | 13.6°C | 10.0°C | 6.3°C | 16.9°C | 1.8°C | 35 mm | 81% | 2.2 m/s | 4 |
| 2003 | 11.6°C | 8.0°C | 4.5°C | 14.9°C | 2.0°C | 52 mm | 78% | 3.6 m/s | 4.3 |
| 2002 | 13.4°C | 9.7°C | 6.0°C | 19.6°C | 3.4°C | 52 mm | 74% | 3.7 m/s | 4.1 |
| 2001 | 14.9°C | 11.2°C | 7.5°C | 18.7°C | 3.2°C | 41 mm | 81% | 2.5 m/s | 4 |
| 2000 | 13.2°C | 9.9°C | 6.5°C | 17.4°C | 2.8°C | 44 mm | 78% | 3.5 m/s | 3.9 |
| 1999 | 14.6°C | 10.8°C | 7.0°C | 20.2°C | 3.4°C | 20 mm | 79% | 2.5 m/s | 3.9 |
| 1998 | 14.3°C | 10.6°C | 7.0°C | 18.6°C | 3.5°C | 53 mm | 78% | 2.9 m/s | 4.1 |
| 1997 | 12.3°C | 9.3°C | 6.3°C | 15.9°C | 3.2°C | 80 mm | 81% | 2.4 m/s | 3.9 |
| 1996 | 11.8°C | 8.4°C | 4.9°C | 16.6°C | 1.3°C | 86 mm | 80% | 3.4 m/s | 3.8 |
| 1995 | 12.0°C | 8.5°C | 5.0°C | 17.0°C | 1.7°C | 26 mm | 79% | 2.8 m/s | 3.9 |
| 1994 | 11.7°C | 7.9°C | 4.0°C | 17.3°C | 1.4°C | 32 mm | 77% | 3.1 m/s | 4.2 |
| 1993 | 13.3°C | 9.6°C | 6.0°C | 20.8°C | 2.6°C | 58 mm | 81% | 2.5 m/s | 3.9 |
| 1992 ❄️ | 11.0°C | 7.8°C | 4.6°C | 14.3°C | 1.8°C | 54 mm | 82% | 2.7 m/s | 3.7 |
| 1991 | 12.6°C | 8.7°C | 4.9°C | 16.1°C | 1.5°C | 49 mm | 81% | 2.6 m/s | 4.1 |
| 1990 | 13.3°C | 9.3°C | 5.4°C | 17.7°C | 2.3°C | 28 mm | 79% | 2.6 m/s | 4 |
| 1989 | 12.9°C | 9.5°C | 6.0°C | 17.9°C | 3.5°C | 53 mm | 83% | 2.6 m/s | 4 |
| 1988 | 13.7°C | 10.4°C | 7.0°C | 18.6°C | 3.0°C | 71 mm | 83% | 3 m/s | 3.8 |
| 1987 | 14.4°C | 10.2°C | 5.9°C | 22.2°C | 1.9°C | 35 mm | 77% | 2.8 m/s | 4.3 |
| 1986 | 12.1°C | 8.8°C | 5.5°C | 16.4°C | 1.8°C | 49 mm | 82% | 2.6 m/s | 4 |
| 1985 | 12.5°C | 9.1°C | 5.6°C | 15.2°C | 2.9°C | 50 mm | 83% | 2.6 m/s | 4.1 |
| 1984 | 12.0°C | 8.9°C | 5.9°C | 14.6°C | 2.3°C | 122 mm | 85% | 2.6 m/s | 3.8 |
| 1983 | 12.4°C | 9.0°C | 5.6°C | 16.2°C | 1.7°C | 78 mm | 80% | 3.1 m/s | — |
| 1982 | 13.2°C | 9.0°C | 4.9°C | 17.9°C | 1.6°C | 44 mm | 77% | 2.9 m/s | — |
| 1981 | 13.9°C | 10.1°C | 6.2°C | 17.3°C | 2.5°C | 20 mm | 80% | 3 m/s | — |
Actual recorded September data for each year, 1981–2025 — sourced from NASA POWER.
The average high in September is around 13.3°C with lows near 6°C (mean 9.7°C), based on 45 years of NASA POWER data.
September averages 50 mm of rainfall in Bicheno, about average for rainfall. The wettest on record was 135 mm in 2009.
The hottest September reached 22.2°C in 1987. The coldest dipped to 1.3°C in 1996.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average September temperatures have risen by about 1°C. Daytime highs moved from 12.8°C to 13.9°C and overnight lows from 5.6°C to 6.5°C over the same span.
September is one of the cooler months of the year in Bicheno and about average for rainfall, so plan for around 13.3°C daytime highs and 6°C at night.
Not quite — September is the 4th coolest month in Bicheno, averaging 9.7°C.
For September in Bicheno, pack warm layers and a jacket for chilly mornings, with typical highs of 13.3°C and lows of 6°C. Bring an umbrella or light rain jacket too.
Relative humidity in September averages 79% — quite humid.
Average wind speed in September is 2.9 m/s. The windiest September on record averaged 3.7 m/s (2002).
The wettest September on record was 2009 with 135 mm. On average, September sees 50 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 Bicheno 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.
