September is one of the cooler months of the year in Goulburn, with average highs near 16.6°C and lows around 5.6°C (mean 11.1°C). It is one of the drier months, averaging 56 mm of rainfall and 74% relative humidity across the period.
September is one of the cooler months of the year in Goulburn. Across 45 years of records, the warmest September in Goulburn was 2023 — when the month averaged 14.7°C — while the coldest was 1984 at 8.8°C. Typical September days reach 16.6°C with nights near 5.6°C. The long-term trend is warming, about 0.5°C per decade.
September is one of the drier months in Goulburn, averaging 56 mm of rainfall. The wettest September on record was 1985 with 132 mm, while the driest was 2017 at 6 mm.
Relative humidity in Goulburn during September averages 74%. The most humid September was 2022 at 85%, and the least humid was 2017 at 54%.
September receives about 4.8 kWh/m²/day of solar energy in Goulburn. The sunniest September was 2023 at 5.6 kWh/m²/day, and the cloudiest was 2016 at 3.7.
Average wind speed in Goulburn during September is 1.4 m/s. The windiest Septembers were 1996, 2003 and 2017 at 1.9 m/s, while the calmest was 1985 at 1 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 10.4°C | 10.3°C | 11.7°C | 11.4°C | 12.0°C | +1.6°C |
| Avg High | 15.7°C | 15.4°C | 17.4°C | 17.0°C | 17.6°C | +1.9°C |
| Avg Low | 5.1°C | 5.2°C | 6.0°C | 5.8°C | 6.4°C | +1.3°C |
| Avg Rain | 62 mm | 75 mm | 49 mm | 43 mm | 47 mm | -15 mm |
September temperatures in Goulburn have risen by about 1.6°C between 1981–1985 and 2021–2025.
September has ranged from a record low of -1.1°C (1995) to a record high of 31.4°C (2017).
Rainfall in September is one of the drier months, averaging 56 mm, with a wettest year of 132 mm.
Daytime highs and overnight lows have shifted differently — highs rose about 0.6°C per decade while lows rose 0.3°C per decade, widening the gap between day and night.
A good time to visit Goulburn
September is a good time to visit Goulburn, with days averaging 16.6°C and nights around 5.6°C (mean 11.1°C, cooler than Goulburn's yearly average) and moderate rainfall. January and February are marginally more temperate, but September still suits most travellers.
| Year | Avg High | Avg Temp | Avg Low | Hottest Day | Coldest Day | Rainfall | Humidity | Wind | Solar |
|---|---|---|---|---|---|---|---|---|---|
| 2025 | 17.4°C | 11.7°C | 6.0°C | 23.7°C | 1.3°C | 81 mm | 72% | 1.5 m/s | 5.2 |
| 2024 | 18.0°C | 12.0°C | 6.0°C | 23.2°C | -0.1°C | 19 mm | 63% | 1.6 m/s | 5.1 |
| 2023 🔥 | 21.9°C | 14.7°C | 7.4°C | 30.3°C | 1.5°C | 18 mm | 57% | 1.2 m/s | 5.6 |
| 2022 | 14.4°C | 10.5°C | 6.6°C | 17.4°C | 1.6°C | 103 mm | 85% | 1.3 m/s | 4.1 |
| 2021 | 17.0°C | 11.3°C | 5.5°C | 21.8°C | 2.1°C | 41 mm | 71% | 1.5 m/s | 4.8 |
| 2020 | 17.1°C | 11.9°C | 6.7°C | 23.1°C | 1.4°C | 17 mm | 79% | 1.3 m/s | 4.8 |
| 2019 | 18.6°C | 12.2°C | 5.7°C | 24.5°C | 1.7°C | 43 mm | 62% | 1.4 m/s | 5 |
| 2018 | 18.4°C | 11.9°C | 5.4°C | 26.5°C | 1.4°C | 20 mm | 61% | 1.2 m/s | 5.1 |
| 2017 | 18.7°C | 12.1°C | 5.4°C | 31.4°C | 0.5°C | 6 mm | 54% | 1.9 m/s | 5.1 |
| 2016 | 15.3°C | 10.8°C | 6.4°C | 19.1°C | 3.2°C | 68 mm | 82% | 1.4 m/s | 3.7 |
| 2015 | 15.3°C | 10.3°C | 5.3°C | 20.8°C | 1.7°C | 37 mm | 81% | 1.1 m/s | 5 |
| 2014 | 16.3°C | 11.2°C | 6.0°C | 23.4°C | 2.1°C | 37 mm | 79% | 1.2 m/s | 5 |
| 2013 | 17.8°C | 12.3°C | 6.9°C | 22.8°C | 2.3°C | 82 mm | 74% | 1.5 m/s | 5.1 |
| 2012 | 17.3°C | 11.4°C | 5.5°C | 25.3°C | -0.7°C | 32 mm | 69% | 1.4 m/s | 5.1 |
| 2011 | 16.9°C | 11.3°C | 5.6°C | 25.2°C | 1.0°C | 44 mm | 71% | 1.5 m/s | 4.9 |
| 2010 | 15.7°C | 10.7°C | 5.8°C | 20.4°C | 0.9°C | 59 mm | 78% | 1.5 m/s | 4.7 |
| 2009 | 18.8°C | 12.6°C | 6.5°C | 25.9°C | 1.3°C | 44 mm | 65% | 1.7 m/s | 4.7 |
| 2008 | 17.9°C | 11.7°C | 5.5°C | 25.7°C | -0.4°C | 44 mm | 66% | 1.4 m/s | 5.3 |
| 2007 | 15.8°C | 10.5°C | 5.3°C | 19.9°C | 2.2°C | 28 mm | 74% | 1.4 m/s | 5.1 |
| 2006 | 18.0°C | 12.3°C | 6.7°C | 23.9°C | 3.1°C | 48 mm | 68% | 1.4 m/s | 5.2 |
| 2005 | 16.4°C | 11.0°C | 5.6°C | 24.3°C | 1.8°C | 83 mm | 77% | 1.3 m/s | 4.4 |
| 2004 | 17.5°C | 11.7°C | 6.0°C | 24.7°C | 0.7°C | 65 mm | 73% | 1.3 m/s | 4.7 |
| 2003 | 16.1°C | 10.5°C | 4.9°C | 25.5°C | -0.2°C | 26 mm | 69% | 1.9 m/s | 5.1 |
| 2002 | 18.5°C | 12.1°C | 5.8°C | 25.9°C | 0.3°C | 31 mm | 58% | 1.7 m/s | 4.9 |
| 2001 | 17.4°C | 12.2°C | 7.0°C | 24.5°C | 3.1°C | 59 mm | 80% | 1.2 m/s | 4.4 |
| 2000 | 17.6°C | 12.0°C | 6.4°C | 26.1°C | 0.4°C | 65 mm | 74% | 1.6 m/s | 4.9 |
| 1999 | 17.5°C | 12.2°C | 6.9°C | 22.7°C | 0.7°C | 60 mm | 76% | 1.2 m/s | 4.7 |
| 1998 | 16.2°C | 11.7°C | 7.2°C | 22.6°C | 1.0°C | 49 mm | 84% | 1.3 m/s | 4.5 |
| 1997 | 14.5°C | 10.2°C | 6.0°C | 18.3°C | 1.3°C | 129 mm | 84% | 1.2 m/s | 4.5 |
| 1996 | 15.2°C | 10.2°C | 5.2°C | 23.1°C | 2.2°C | 73 mm | 74% | 1.9 m/s | 4.7 |
| 1995 | 15.7°C | 10.5°C | 5.2°C | 23.1°C | -1.1°C | 124 mm | 77% | 1.3 m/s | 4.5 |
| 1994 | 16.5°C | 10.1°C | 3.7°C | 22.7°C | -0.6°C | 14 mm | 60% | 1.6 m/s | 5.2 |
| 1993 | 15.4°C | 10.3°C | 5.2°C | 22.7°C | 1.4°C | 98 mm | 80% | 1.3 m/s | 4.6 |
| 1992 | 14.2°C | 8.9°C | 3.7°C | 20.4°C | -0.3°C | 61 mm | 76% | 1.5 m/s | 4.3 |
| 1991 | 14.6°C | 9.4°C | 4.2°C | 19.0°C | -0.7°C | 37 mm | 78% | 1.7 m/s | 4.8 |
| 1990 | 14.3°C | 9.7°C | 5.0°C | 23.2°C | 2.1°C | 100 mm | 84% | 1.2 m/s | 4.7 |
| 1989 | 15.2°C | 9.6°C | 4.1°C | 21.4°C | 0.9°C | 20 mm | 80% | 1.4 m/s | 4.9 |
| 1988 | 15.6°C | 10.8°C | 6.0°C | 19.6°C | 2.6°C | 77 mm | 81% | 1.4 m/s | 4.6 |
| 1987 | 16.6°C | 10.8°C | 5.0°C | 25.8°C | -0.4°C | 25 mm | 74% | 1.4 m/s | 5 |
| 1986 | 15.1°C | 10.4°C | 5.7°C | 23.3°C | 2.0°C | 73 mm | 81% | 1.4 m/s | 4.7 |
| 1985 🌧️ | 14.5°C | 9.6°C | 4.6°C | 20.7°C | 1.0°C | 132 mm | 81% | 1 m/s | 4.9 |
| 1984 ❄️ | 13.2°C | 8.8°C | 4.3°C | 19.1°C | 0.0°C | 68 mm | 81% | 1.4 m/s | 4.4 |
| 1983 | 16.1°C | 10.8°C | 5.4°C | 21.9°C | 0.5°C | 54 mm | 78% | 1.6 m/s | — |
| 1982 | 16.4°C | 10.5°C | 4.7°C | 24.6°C | -0.7°C | 96 mm | 68% | 1.5 m/s | — |
| 1981 | 18.5°C | 12.3°C | 6.0°C | 26.3°C | 0.7°C | 15 mm | 72% | 1.4 m/s | — |
Actual recorded September data for each year, 1981–2025 — sourced from NASA POWER.
The average high in September is around 16.6°C with lows near 5.6°C (mean 11.1°C), based on 45 years of NASA POWER data.
September averages 56 mm of rainfall in Goulburn, one of the drier months. The wettest on record was 132 mm in 1985.
The hottest September reached 31.4°C in 2017. The coldest dipped to -1.1°C in 1995.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average September temperatures have risen by about 1.6°C. Daytime highs moved from 15.7°C to 17.7°C and overnight lows from 5°C to 6.3°C over the same span.
September is one of the cooler months of the year in Goulburn and one of the drier months, so plan for around 16.6°C daytime highs and 5.6°C at night.
Not quite — September is the 4th coolest month in Goulburn, averaging 11.1°C.
For September in Goulburn, pack warm layers and a jacket for chilly mornings, with typical highs of 16.6°C and lows of 5.6°C. Bring an umbrella or light rain jacket too.
Relative humidity in September averages 74% — moderately humid.
Average wind speed in September is 1.4 m/s. The windiest September on record averaged 1.9 m/s (1996).
The wettest September on record was 1985 with 132 mm. On average, September sees 56 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 Goulburn 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.
