September is one of the cooler months of the year in Bairnsdale, with average highs near 16.3°C and lows around 8.2°C (mean 12.3°C). It is about average for rainfall, averaging 59 mm of rainfall and 76% relative humidity across the period.
September is one of the cooler months of the year in Bairnsdale. Across 45 years of records, the warmest September in Bairnsdale was 2023 — when the month averaged 15°C — while the coldest was 1992 at 10.1°C. Typical September days reach 16.3°C with nights near 8.2°C. The long-term trend is warming, about 0.4°C per decade.
September is about average for rainfall in Bairnsdale, averaging 59 mm of rainfall. The wettest September on record was 1993 with 203 mm, while the driest was 2025 at 20 mm.
Relative humidity in Bairnsdale during September averages 76%. The most humid Septembers were 1984 and 1993 at 83%, and the least humid was 2023 at 66%.
September receives about 4.3 kWh/m²/day of solar energy in Bairnsdale. The sunniest September was 2023 at 4.9 kWh/m²/day, and the cloudiest was 1992 at 3.6.
Average wind speed in Bairnsdale during September is 2.8 m/s. The windiest September was 2003 at 3.7 m/s, while the calmest was 2001 at 2.2 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 11.7°C | 11.6°C | 12.7°C | 12.4°C | 13.2°C | +1.5°C |
| Avg High | 15.7°C | 15.4°C | 16.9°C | 16.6°C | 17.5°C | +1.8°C |
| Avg Low | 7.7°C | 7.8°C | 8.5°C | 8.3°C | 9.0°C | +1.3°C |
| Avg Rain | 63 mm | 81 mm | 53 mm | 44 mm | 51 mm | -13 mm |
September temperatures in Bairnsdale have risen by about 1.9°C between 1981–1985 and 2021–2025.
September has ranged from a record low of 3°C (1992) to a record high of 27.8°C (2017).
Rainfall in September is about average for rainfall, averaging 59 mm, with a wettest year of 203 mm.
Daytime highs and overnight lows have shifted differently — highs rose about 0.5°C per decade while lows rose 0.3°C per decade, widening the gap between day and night.
A quieter season to visit Bairnsdale
If your dates are flexible, the more temperate months of February and January tend to be the most comfortable for visiting Bairnsdale. That said, September — with days averaging 16.3°C and nights around 8.2°C (mean 12.3°C) and moderate rainfall (59 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 | 17.8°C | 13.4°C | 9.1°C | 21.8°C | 4.9°C | 20 mm | 70% | 3 m/s | 4.4 |
| 2024 | 17.7°C | 13.5°C | 9.3°C | 24.2°C | 6.7°C | 71 mm | 71% | 3.1 m/s | 4.4 |
| 2023 🔥 | 20.1°C | 15.0°C | 9.9°C | 27.3°C | 5.6°C | 24 mm | 66% | 2.6 m/s | 4.9 |
| 2022 | 15.7°C | 12.2°C | 8.7°C | 21.3°C | 4.6°C | 61 mm | 81% | 2.5 m/s | 3.7 |
| 2021 | 16.2°C | 12.3°C | 8.4°C | 22.3°C | 5.2°C | 104 mm | 77% | 2.9 m/s | 4.3 |
| 2020 | 17.4°C | 12.9°C | 8.5°C | 22.7°C | 4.7°C | 24 mm | 73% | 2.5 m/s | 4.3 |
| 2019 | 17.4°C | 12.9°C | 8.4°C | 24.6°C | 6.1°C | 34 mm | 72% | 2.8 m/s | 4.5 |
| 2018 | 16.9°C | 12.1°C | 7.3°C | 22.9°C | 4.3°C | 23 mm | 70% | 2.6 m/s | 4.8 |
| 2017 | 17.3°C | 12.7°C | 8.1°C | 27.8°C | 4.2°C | 34 mm | 67% | 3.5 m/s | 4.4 |
| 2016 | 16.2°C | 12.3°C | 8.5°C | 20.3°C | 6.4°C | 61 mm | 80% | 2.5 m/s | 3.8 |
| 2015 | 15.9°C | 11.8°C | 7.7°C | 22.5°C | 4.2°C | 23 mm | 79% | 2.5 m/s | 4.4 |
| 2014 | 16.7°C | 12.6°C | 8.5°C | 22.7°C | 5.8°C | 64 mm | 78% | 2.6 m/s | 4.5 |
| 2013 | 17.1°C | 13.4°C | 9.7°C | 22.1°C | 4.6°C | 66 mm | 79% | 2.8 m/s | 4.1 |
| 2012 | 16.2°C | 12.4°C | 8.5°C | 22.2°C | 3.8°C | 39 mm | 77% | 3 m/s | 4.4 |
| 2011 | 16.3°C | 12.3°C | 8.2°C | 22.3°C | 4.9°C | 59 mm | 78% | 2.9 m/s | 4.4 |
| 2010 | 15.5°C | 11.5°C | 7.6°C | 20.1°C | 4.5°C | 33 mm | 77% | 3.1 m/s | 4.2 |
| 2009 | 17.5°C | 13.1°C | 8.8°C | 23.6°C | 4.6°C | 76 mm | 73% | 3.1 m/s | 4.4 |
| 2008 | 17.9°C | 13.0°C | 8.2°C | 23.9°C | 4.4°C | 26 mm | 68% | 2.8 m/s | 4.8 |
| 2007 | 15.9°C | 11.8°C | 7.8°C | 19.0°C | 4.7°C | 30 mm | 77% | 2.9 m/s | 4.4 |
| 2006 | 17.5°C | 13.3°C | 9.0°C | 23.6°C | 5.9°C | 47 mm | 72% | 2.6 m/s | 4.6 |
| 2005 | 16.3°C | 12.6°C | 8.8°C | 23.1°C | 5.3°C | 69 mm | 79% | 2.5 m/s | 3.8 |
| 2004 | 15.8°C | 12.2°C | 8.5°C | 22.8°C | 5.3°C | 59 mm | 80% | 2.6 m/s | 3.7 |
| 2003 | 16.0°C | 11.8°C | 7.6°C | 22.5°C | 3.7°C | 39 mm | 71% | 3.7 m/s | 4.5 |
| 2002 | 17.6°C | 13.0°C | 8.4°C | 23.9°C | 5.2°C | 41 mm | 68% | 3.3 m/s | 4.3 |
| 2001 | 17.3°C | 13.2°C | 9.1°C | 24.3°C | 5.4°C | 48 mm | 80% | 2.2 m/s | 3.9 |
| 2000 | 16.8°C | 12.7°C | 8.7°C | 21.3°C | 5.2°C | 91 mm | 77% | 3 m/s | 4.2 |
| 1999 | 17.8°C | 13.7°C | 9.5°C | 24.3°C | 6.7°C | 47 mm | 74% | 2.5 m/s | 4.2 |
| 1998 | 16.8°C | 12.8°C | 8.8°C | 22.1°C | 5.6°C | 41 mm | 80% | 2.5 m/s | 4.2 |
| 1997 | 15.4°C | 11.9°C | 8.3°C | 18.8°C | 5.4°C | 44 mm | 80% | 2.4 m/s | 4.2 |
| 1996 | 15.6°C | 11.6°C | 7.7°C | 21.9°C | 4.4°C | 57 mm | 76% | 3.4 m/s | 4.1 |
| 1995 | 15.1°C | 11.1°C | 7.1°C | 22.3°C | 3.3°C | 67 mm | 79% | 2.6 m/s | 4.2 |
| 1994 | 14.7°C | 10.7°C | 6.7°C | 21.3°C | 3.8°C | 52 mm | 73% | 3.2 m/s | 4.3 |
| 1993 🌧️ | 15.2°C | 11.6°C | 8.1°C | 23.0°C | 5.1°C | 203 mm | 83% | 2.9 m/s | 4 |
| 1992 ❄️ | 13.4°C | 10.1°C | 6.7°C | 18.0°C | 3.0°C | 137 mm | 83% | 2.9 m/s | 3.6 |
| 1991 | 14.9°C | 11.2°C | 7.5°C | 20.1°C | 4.1°C | 75 mm | 81% | 3.1 m/s | 4.2 |
| 1990 | 15.3°C | 11.5°C | 7.7°C | 21.2°C | 5.6°C | 84 mm | 82% | 2.6 m/s | 4.2 |
| 1989 | 14.9°C | 11.1°C | 7.4°C | 21.9°C | 5.2°C | 53 mm | 83% | 2.8 m/s | 4.3 |
| 1988 | 17.0°C | 12.8°C | 8.6°C | 21.6°C | 5.1°C | 100 mm | 78% | 2.6 m/s | 4.4 |
| 1987 | 17.1°C | 12.8°C | 8.5°C | 27.4°C | 4.8°C | 36 mm | 76% | 3 m/s | 4.4 |
| 1986 | 15.7°C | 11.9°C | 8.1°C | 20.5°C | 5.2°C | 55 mm | 78% | 2.6 m/s | 4.2 |
| 1985 | 14.7°C | 11.0°C | 7.2°C | 21.2°C | 4.7°C | 63 mm | 83% | 2.7 m/s | 4.6 |
| 1984 | 14.3°C | 10.7°C | 7.0°C | 18.1°C | 3.8°C | 81 mm | 83% | 2.9 m/s | 4.2 |
| 1983 | 15.2°C | 11.4°C | 7.6°C | 20.5°C | 3.8°C | 98 mm | 81% | 2.8 m/s | — |
| 1982 | 16.0°C | 11.5°C | 7.1°C | 22.8°C | 4.1°C | 50 mm | 72% | 2.9 m/s | — |
| 1981 | 16.8°C | 12.4°C | 8.1°C | 23.6°C | 4.0°C | 34 mm | 80% | 2.7 m/s | — |
Actual recorded September data for each year, 1981–2025 — sourced from NASA POWER.
The average high in September is around 16.3°C with lows near 8.2°C (mean 12.3°C), based on 45 years of NASA POWER data.
September averages 59 mm of rainfall in Bairnsdale, about average for rainfall. The wettest on record was 203 mm in 1993.
The hottest September reached 27.8°C in 2017. The coldest dipped to 3°C in 1992.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average September temperatures have risen by about 1.9°C. Daytime highs moved from 15.4°C to 17.5°C and overnight lows from 7.4°C to 9.1°C over the same span.
September is one of the cooler months of the year in Bairnsdale and about average for rainfall, so plan for around 16.3°C daytime highs and 8.2°C at night.
Not quite — September is the 4th coolest month in Bairnsdale, averaging 12.3°C.
For September in Bairnsdale, pack light layers you can adjust through the day, with typical highs of 16.3°C and lows of 8.2°C. Bring an umbrella or light rain jacket too.
Relative humidity in September averages 76% — quite humid.
Average wind speed in September is 2.8 m/s. The windiest September on record averaged 3.7 m/s (2003).
The wettest September on record was 1993 with 203 mm. On average, September sees 59 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 Bairnsdale 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.
