September is one of the cooler months of the year in Ballarat, with average highs near 14.1°C and lows around 4.2°C (mean 9.2°C). It is about average for rainfall, averaging 58 mm of rainfall and 81% relative humidity across the period.
September is one of the cooler months of the year in Ballarat. Across 45 years of records, the warmest September in Ballarat was 2023 — when the month averaged 11.8°C — while the coldest was 1992 at 7.2°C. Typical September days reach 14.1°C with nights near 4.2°C. The long-term trend is warming, about 0.3°C per decade.
September is about average for rainfall in Ballarat, averaging 58 mm of rainfall. The wettest September on record was 1993 with 124 mm, while the driest was 2023 at 14 mm.
Relative humidity in Ballarat during September averages 81%. The most humid September was 1992 at 88%, and the least humid was 2023 at 71%.
September receives about 4 kWh/m²/day of solar energy in Ballarat. The sunniest September was 2023 at 4.7 kWh/m²/day, and the cloudiest were 2010 and 2022 at 3.6.
Average wind speed in Ballarat during September is 2.9 m/s. The windiest September was 1996 at 3.7 m/s, while the calmest was 1997 at 2.2 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 8.8°C | 8.7°C | 9.4°C | 9.3°C | 10.0°C | +1.2°C |
| Avg High | 13.7°C | 13.3°C | 14.5°C | 14.3°C | 15.1°C | +1.4°C |
| Avg Low | 3.9°C | 4.0°C | 4.2°C | 4.4°C | 4.9°C | +1°C |
| Avg Rain | 59 mm | 72 mm | 56 mm | 53 mm | 44 mm | -15 mm |
September temperatures in Ballarat have risen by about 1.4°C between 1981–1985 and 2021–2025.
September has ranged from a record low of -2.1°C (2003) to a record high of 26.1°C (2023).
Rainfall in September is about average for rainfall, averaging 58 mm, with a wettest year of 124 mm.
Daytime highs and overnight lows have shifted differently — highs rose about 0.4°C per decade while lows rose 0.2°C per decade, widening the gap between day and night.
A quieter season to visit Ballarat
If your dates are flexible, the more temperate months of February and January tend to be the most comfortable for visiting Ballarat. That said, September — with days averaging 14.1°C and nights around 4.2°C (mean 9.2°C) and moderate rainfall (58 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 | 14.7°C | 9.7°C | 4.7°C | 20.2°C | -0.3°C | 26 mm | 78% | 3.2 m/s | 4.1 |
| 2024 | 15.4°C | 10.1°C | 4.9°C | 21.5°C | 1.0°C | 33 mm | 75% | 3.3 m/s | 3.9 |
| 2023 🔥 | 18.1°C | 11.8°C | 5.4°C | 26.1°C | 0.5°C | 14 mm | 71% | 2.6 m/s | 4.7 |
| 2022 | 13.3°C | 9.0°C | 4.8°C | 18.3°C | 0.4°C | 66 mm | 86% | 2.7 m/s | 3.6 |
| 2021 | 14.4°C | 9.5°C | 4.6°C | 21.3°C | 0.5°C | 65 mm | 82% | 3 m/s | 4.2 |
| 2020 | 14.7°C | 9.8°C | 4.9°C | 21.0°C | 0.5°C | 58 mm | 79% | 3.1 m/s | 4.2 |
| 2019 | 14.6°C | 9.3°C | 3.9°C | 21.7°C | -0.4°C | 36 mm | 78% | 2.6 m/s | 4.2 |
| 2018 | 14.5°C | 8.7°C | 2.9°C | 21.0°C | -0.3°C | 14 mm | 75% | 2.7 m/s | 4.5 |
| 2017 | 13.8°C | 9.0°C | 4.2°C | 23.1°C | -0.7°C | 40 mm | 78% | 3.4 m/s | 4.1 |
| 2016 | 13.2°C | 9.0°C | 4.9°C | 18.5°C | 3.3°C | 102 mm | 86% | 2.7 m/s | 3.7 |
| 2015 | 15.3°C | 9.8°C | 4.3°C | 24.5°C | 0.3°C | 37 mm | 77% | 2.5 m/s | 4 |
| 2014 | 15.2°C | 9.8°C | 4.5°C | 23.6°C | 1.0°C | 41 mm | 81% | 2.6 m/s | 4.3 |
| 2013 | 15.2°C | 10.6°C | 6.1°C | 21.1°C | -1.3°C | 74 mm | 83% | 2.9 m/s | 3.8 |
| 2012 | 14.1°C | 9.4°C | 4.7°C | 21.3°C | 0.5°C | 47 mm | 81% | 2.9 m/s | 4.1 |
| 2011 | 14.8°C | 9.7°C | 4.5°C | 23.7°C | 1.1°C | 56 mm | 79% | 2.9 m/s | 4.2 |
| 2010 | 12.1°C | 8.1°C | 4.0°C | 15.7°C | 0.2°C | 83 mm | 88% | 2.7 m/s | 3.6 |
| 2009 | 14.2°C | 9.2°C | 4.2°C | 22.2°C | 0.5°C | 92 mm | 80% | 3.1 m/s | 3.8 |
| 2008 | 14.6°C | 9.1°C | 3.6°C | 23.5°C | -0.3°C | 29 mm | 77% | 2.9 m/s | 4.4 |
| 2007 | 14.5°C | 9.2°C | 3.9°C | 18.9°C | -0.1°C | 39 mm | 77% | 3.1 m/s | 4.3 |
| 2006 | 16.1°C | 10.2°C | 4.2°C | 24.7°C | -0.6°C | 41 mm | 72% | 2.9 m/s | 4.3 |
| 2005 | 14.5°C | 9.7°C | 5.0°C | 21.0°C | -1.2°C | 52 mm | 80% | 2.6 m/s | 3.9 |
| 2004 | 13.7°C | 9.3°C | 4.9°C | 21.4°C | 0.4°C | 65 mm | 85% | 2.4 m/s | 3.7 |
| 2003 | 12.8°C | 7.8°C | 2.9°C | 19.8°C | -2.1°C | 45 mm | 83% | 3.4 m/s | 4.1 |
| 2002 | 15.0°C | 9.4°C | 3.8°C | 23.1°C | 0.6°C | 46 mm | 73% | 3.4 m/s | 4 |
| 2001 | 15.6°C | 10.4°C | 5.2°C | 25.2°C | 0.3°C | 54 mm | 80% | 2.7 m/s | 3.9 |
| 2000 | 13.8°C | 9.2°C | 4.6°C | 19.1°C | 1.3°C | 95 mm | 86% | 3.1 m/s | 3.8 |
| 1999 | 15.7°C | 10.6°C | 5.4°C | 21.9°C | 1.0°C | 39 mm | 80% | 2.7 m/s | 4.2 |
| 1998 | 15.0°C | 10.0°C | 4.9°C | 22.1°C | 0.2°C | 55 mm | 82% | 3 m/s | 4 |
| 1997 | 14.2°C | 9.3°C | 4.3°C | 16.6°C | -0.6°C | 80 mm | 83% | 2.2 m/s | 4.2 |
| 1996 | 12.2°C | 7.9°C | 3.5°C | 19.0°C | -1.7°C | 109 mm | 85% | 3.7 m/s | 3.9 |
| 1995 | 12.8°C | 8.0°C | 3.2°C | 17.6°C | -1.4°C | 37 mm | 85% | 2.5 m/s | 3.9 |
| 1994 | 12.3°C | 7.4°C | 2.5°C | 18.2°C | -1.2°C | 42 mm | 80% | 2.8 m/s | 3.9 |
| 1993 🌧️ | 13.6°C | 9.1°C | 4.6°C | 21.5°C | -0.3°C | 124 mm | 86% | 2.8 m/s | 3.9 |
| 1992 ❄️ | 11.0°C | 7.2°C | 3.5°C | 14.0°C | 0.1°C | 110 mm | 88% | 2.5 m/s | 3.7 |
| 1991 | 12.7°C | 8.2°C | 3.7°C | 17.9°C | -1.1°C | 83 mm | 86% | 2.8 m/s | 4 |
| 1990 | 13.8°C | 8.9°C | 4.1°C | 20.0°C | 0.4°C | 44 mm | 83% | 2.8 m/s | 4.4 |
| 1989 | 13.5°C | 8.6°C | 3.7°C | 20.1°C | 0.8°C | 55 mm | 85% | 2.8 m/s | 4.3 |
| 1988 | 14.5°C | 9.5°C | 4.5°C | 18.6°C | 0.1°C | 70 mm | 82% | 3 m/s | 4.1 |
| 1987 | 14.6°C | 9.4°C | 4.3°C | 24.9°C | 0.3°C | 38 mm | 82% | 2.6 m/s | 4.1 |
| 1986 | 13.0°C | 8.6°C | 4.2°C | 18.5°C | 0.6°C | 65 mm | 87% | 2.9 m/s | 3.8 |
| 1985 | 13.3°C | 8.5°C | 3.6°C | 19.8°C | 0.5°C | 43 mm | 83% | 2.6 m/s | 4.3 |
| 1984 | 11.8°C | 7.5°C | 3.3°C | 17.9°C | 0.6°C | 93 mm | 85% | 2.8 m/s | 3.7 |
| 1983 | 12.7°C | 8.3°C | 3.9°C | 19.6°C | -0.9°C | 95 mm | 87% | 3.2 m/s | — |
| 1982 | 15.1°C | 8.9°C | 2.6°C | 23.9°C | -1.2°C | 39 mm | 73% | 2.7 m/s | — |
| 1981 | 14.6°C | 9.7°C | 4.7°C | 23.0°C | 1.6°C | 32 mm | 85% | 2.8 m/s | — |
Actual recorded September data for each year, 1981–2025 — sourced from NASA POWER.
The average high in September is around 14.1°C with lows near 4.2°C (mean 9.2°C), based on 45 years of NASA POWER data.
September averages 58 mm of rainfall in Ballarat, about average for rainfall. The wettest on record was 124 mm in 1993.
The hottest September reached 26.1°C in 2023. The coldest dipped to -2.1°C in 2003.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average September temperatures have risen by about 1.4°C. Daytime highs moved from 13.5°C to 15.2°C and overnight lows from 3.6°C to 4.9°C over the same span.
September is one of the cooler months of the year in Ballarat and about average for rainfall, so plan for around 14.1°C daytime highs and 4.2°C at night.
Not quite — September is the 4th coolest month in Ballarat, averaging 9.2°C.
For September in Ballarat, pack warm layers and a jacket for chilly mornings, with typical highs of 14.1°C and lows of 4.2°C. Bring an umbrella or light rain jacket too.
Relative humidity in September averages 81% — quite humid.
Average wind speed in September is 2.9 m/s. The windiest September on record averaged 3.7 m/s (1996).
The wettest September on record was 1993 with 124 mm. On average, September sees 58 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 Ballarat 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.
