September is one of the cooler months of the year in Traralgon, with average highs near 14.5°C and lows around 5.9°C (mean 10.2°C). It is a relatively wet time of year, averaging 94 mm of rainfall and 79% relative humidity across the period.
September is one of the cooler months of the year in Traralgon. Across 45 years of records, the warmest September in Traralgon was 2023 — when the month averaged 13.6°C — while the coldest was 1992 at 7.8°C. Typical September days reach 14.5°C with nights near 5.9°C. The long-term trend is warming, about 0.5°C per decade.
September is a relatively wet time of year in Traralgon, averaging 94 mm of rainfall. The wettest September on record was 1993 with 208 mm, while the driest was 2015 at 16 mm.
Relative humidity in Traralgon during September averages 79%. The most humid September was 1992 at 89%, and the least humid was 2023 at 64%.
September receives about 3.9 kWh/m²/day of solar energy in Traralgon. The sunniest September was 1985 at 4.5 kWh/m²/day, and the cloudiest was 1992 at 3.5.
Average wind speed in Traralgon during September is 0.1 m/s. The windiest Septembers were 2022, 2023 and 2024, among others at 0.1 m/s, while the calmest were 2017, 2020 and 2025, among others at 0 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 9.6°C | 9.5°C | 10.5°C | 10.5°C | 11.6°C | +2°C |
| Avg High | 13.8°C | 13.5°C | 14.8°C | 14.9°C | 16.3°C | +2.5°C |
| Avg Low | 5.5°C | 5.5°C | 6.1°C | 6.1°C | 6.8°C | +1.3°C |
| Avg Rain | 101 mm | 124 mm | 99 mm | 75 mm | 59 mm | -41 mm |
September temperatures in Traralgon have risen by about 2.2°C between 1981–1985 and 2021–2025.
September has ranged from a record low of -0.4°C (1982) to a record high of 26.8°C (2023).
Rainfall in September is a relatively wet time of year, averaging 94 mm, with a wettest year of 208 mm.
Daytime highs and overnight lows have shifted differently — highs rose about 0.7°C per decade while lows rose 0.3°C per decade, widening the gap between day and night.
A quieter season to visit Traralgon
If your dates are flexible, the more temperate months of February and January tend to be the most comfortable for visiting Traralgon. That said, September — with days averaging 14.5°C and nights around 5.9°C (mean 10.2°C) and higher rainfall (94 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 | 16.0°C | 11.6°C | 7.3°C | 21.0°C | 2.4°C | 36 mm | 69% | 0 m/s | 3.9 |
| 2024 | 16.2°C | 11.6°C | 7.0°C | 23.8°C | 1.6°C | 74 mm | 71% | 0.1 m/s | 3.7 |
| 2023 🔥 | 19.5°C | 13.6°C | 7.7°C | 26.8°C | 4.1°C | 32 mm | 64% | 0.1 m/s | 4.4 |
| 2022 | 14.7°C | 10.6°C | 6.4°C | 21.6°C | 1.0°C | 55 mm | 81% | 0.1 m/s | 3.7 |
| 2021 | 15.1°C | 10.7°C | 6.2°C | 21.9°C | 2.1°C | 118 mm | 75% | 0.1 m/s | 4.1 |
| 2020 | 16.2°C | 11.3°C | 6.5°C | 24.3°C | 1.4°C | 41 mm | 72% | 0 m/s | 4.1 |
| 2019 | 16.0°C | 11.0°C | 6.0°C | 22.5°C | 2.2°C | 61 mm | 73% | 0.1 m/s | 4.2 |
| 2018 | 15.8°C | 10.1°C | 4.5°C | 21.2°C | 0.2°C | 32 mm | 70% | 0.1 m/s | 4.2 |
| 2017 | 14.8°C | 10.4°C | 6.0°C | 26.6°C | 1.3°C | 67 mm | 71% | 0 m/s | 3.8 |
| 2016 | 14.6°C | 10.5°C | 6.5°C | 19.9°C | 3.2°C | 59 mm | 81% | 0.1 m/s | 3.6 |
| 2015 | 15.6°C | 10.6°C | 5.7°C | 23.2°C | 2.2°C | 16 mm | 76% | 0.1 m/s | 4.1 |
| 2014 | 15.1°C | 10.6°C | 6.2°C | 20.4°C | 2.1°C | 89 mm | 81% | 0.1 m/s | 4.3 |
| 2013 | 15.5°C | 11.6°C | 7.8°C | 20.8°C | 1.3°C | 104 mm | 81% | 0.1 m/s | 3.8 |
| 2012 | 14.3°C | 10.4°C | 6.6°C | 19.6°C | 1.3°C | 109 mm | 81% | 0.1 m/s | 3.8 |
| 2011 | 14.9°C | 10.5°C | 6.2°C | 21.7°C | 1.8°C | 114 mm | 79% | 0.1 m/s | 4.1 |
| 2010 | 12.7°C | 9.1°C | 5.6°C | 17.8°C | 2.3°C | 100 mm | 85% | 0 m/s | 3.6 |
| 2009 | 14.8°C | 10.6°C | 6.4°C | 20.6°C | 3.7°C | 161 mm | 79% | 0 m/s | 3.8 |
| 2008 | 15.7°C | 10.8°C | 6.0°C | 23.3°C | 0.6°C | 53 mm | 70% | 0.1 m/s | 4.2 |
| 2007 | 14.2°C | 9.6°C | 5.1°C | 17.3°C | 1.7°C | 95 mm | 80% | 0.1 m/s | 4.1 |
| 2006 | 16.5°C | 11.5°C | 6.5°C | 23.6°C | 2.2°C | 64 mm | 71% | 0.1 m/s | 4.2 |
| 2005 | 14.6°C | 10.5°C | 6.4°C | 21.7°C | 2.4°C | 113 mm | 82% | 0.1 m/s | 3.7 |
| 2004 | 13.9°C | 10.0°C | 6.1°C | 20.3°C | 2.6°C | 114 mm | 85% | 0.1 m/s | 3.6 |
| 2003 | 12.9°C | 8.9°C | 5.0°C | 19.4°C | 0.5°C | 101 mm | 80% | 0 m/s | 4 |
| 2002 | 15.1°C | 10.7°C | 6.2°C | 22.2°C | 2.6°C | 89 mm | 71% | 0 m/s | 3.9 |
| 2001 | 16.0°C | 11.4°C | 6.8°C | 22.1°C | 2.2°C | 55 mm | 81% | 0.1 m/s | 3.7 |
| 2000 | 14.1°C | 10.5°C | 6.8°C | 19.0°C | 3.5°C | 146 mm | 82% | 0 m/s | 3.9 |
| 1999 | 16.3°C | 11.5°C | 6.8°C | 22.5°C | 1.3°C | 74 mm | 78% | 0.1 m/s | 4 |
| 1998 | 15.4°C | 11.2°C | 7.0°C | 21.0°C | 1.7°C | 97 mm | 80% | 0 m/s | 3.9 |
| 1997 | 14.4°C | 10.2°C | 5.9°C | 17.3°C | 0.1°C | 72 mm | 83% | 0.1 m/s | 4 |
| 1996 | 12.7°C | 9.0°C | 5.4°C | 19.7°C | 1.6°C | 160 mm | 83% | 0 m/s | 3.8 |
| 1995 | 13.2°C | 8.8°C | 4.4°C | 19.4°C | 0.6°C | 76 mm | 85% | 0.1 m/s | 3.9 |
| 1994 | 12.1°C | 8.1°C | 4.2°C | 19.5°C | -0.3°C | 116 mm | 80% | 0.1 m/s | 3.8 |
| 1993 🌧️ | 13.5°C | 9.7°C | 5.8°C | 21.8°C | -0.2°C | 208 mm | 87% | 0.1 m/s | 3.8 |
| 1992 ❄️ | 11.1°C | 7.8°C | 4.6°C | 14.7°C | 0.5°C | 182 mm | 89% | 0 m/s | 3.5 |
| 1991 | 12.6°C | 8.8°C | 5.0°C | 19.3°C | 1.4°C | 152 mm | 86% | 0.1 m/s | 3.9 |
| 1990 | 14.0°C | 9.8°C | 5.6°C | 20.2°C | 0.3°C | 102 mm | 85% | 0.1 m/s | 4 |
| 1989 | 13.6°C | 9.4°C | 5.3°C | 20.2°C | 0.5°C | 89 mm | 84% | 0.1 m/s | 4.2 |
| 1988 | 15.1°C | 10.6°C | 6.1°C | 20.2°C | 1.4°C | 108 mm | 81% | 0.1 m/s | 4.1 |
| 1987 | 14.2°C | 10.4°C | 6.6°C | 23.7°C | 2.0°C | 77 mm | 83% | 0.1 m/s | 4 |
| 1986 | 13.4°C | 9.5°C | 5.5°C | 20.1°C | 3.1°C | 85 mm | 85% | 0.1 m/s | 3.9 |
| 1985 | 13.3°C | 9.0°C | 4.7°C | 20.7°C | 1.2°C | 80 mm | 86% | 0.1 m/s | 4.5 |
| 1984 | 12.4°C | 8.6°C | 4.9°C | 17.2°C | 0.9°C | 150 mm | 87% | 0.1 m/s | 3.9 |
| 1983 | 13.4°C | 9.4°C | 5.5°C | 19.2°C | 1.6°C | 153 mm | 85% | 0 m/s | — |
| 1982 | 13.8°C | 9.1°C | 4.3°C | 19.7°C | -0.4°C | 113 mm | 77% | 0.1 m/s | — |
| 1981 | 14.9°C | 10.7°C | 6.5°C | 22.9°C | 3.0°C | 53 mm | 81% | 0 m/s | — |
Actual recorded September data for each year, 1981–2025 — sourced from NASA POWER.
The average high in September is around 14.5°C with lows near 5.9°C (mean 10.2°C), based on 45 years of NASA POWER data.
September averages 94 mm of rainfall in Traralgon, a relatively wet time of year. The wettest on record was 208 mm in 1993.
The hottest September reached 26.8°C in 2023. The coldest dipped to -0.4°C in 1982.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average September temperatures have risen by about 2.2°C. Daytime highs moved from 13.6°C to 16.3°C and overnight lows from 5.2°C to 6.9°C over the same span.
September is one of the cooler months of the year in Traralgon and a relatively wet time of year, so plan for around 14.5°C daytime highs and 5.9°C at night.
Not quite — September is the 4th coolest month in Traralgon, averaging 10.2°C.
For September in Traralgon, pack warm layers and a jacket for chilly mornings, with typical highs of 14.5°C and lows of 5.9°C. Bring an umbrella or light rain jacket too.
Relative humidity in September averages 79% — quite humid.
Average wind speed in September is 0.1 m/s. The windiest September on record averaged 0.1 m/s (1982).
The wettest September on record was 1993 with 208 mm. On average, September sees 94 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 Traralgon 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.
