September is one of the cooler months of the year in Stawell, with average highs near 15.8°C and lows around 4.8°C (mean 10.3°C). It is a relatively wet time of year, averaging 56 mm of rainfall and 79% relative humidity across the period.
September is one of the cooler months of the year in Stawell. Across 45 years of records, the warmest September in Stawell was 2023 — when the month averaged 12.4°C — while the coldest was 1992 at 8.2°C. Typical September days reach 15.8°C with nights near 4.8°C. The long-term trend is warming, about 0.2°C per decade.
September is a relatively wet time of year in Stawell, averaging 56 mm of rainfall. The wettest September on record was 2016 with 147 mm, while the driest was 2018 at 18 mm.
Relative humidity in Stawell during September averages 79%. The most humid September was 1992 at 87%, and the least humid was 1982 at 67%.
September receives about 4 kWh/m²/day of solar energy in Stawell. The sunniest September was 2023 at 4.7 kWh/m²/day, and the cloudiest was 2022 at 3.4.
Average wind speed in Stawell during September is 2.4 m/s. The windiest September was 1996 at 3 m/s, while the calmest was 1997 at 1.9 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 10.1°C | 10.0°C | 10.6°C | 10.4°C | 10.8°C | +0.7°C |
| Avg High | 15.6°C | 15.3°C | 16.3°C | 15.9°C | 16.3°C | +0.7°C |
| Avg Low | 4.5°C | 4.7°C | 4.9°C | 4.9°C | 5.4°C | +0.9°C |
| Avg Rain | 52 mm | 65 mm | 54 mm | 55 mm | 54 mm | +2 mm |
September temperatures in Stawell have risen by about 1.1°C between 1981–1985 and 2021–2025.
September has ranged from a record low of -0.8°C (1995) to a record high of 28.2°C (1987).
Rainfall in September is a relatively wet time of year, averaging 56 mm, with a wettest year of 147 mm.
A quieter season to visit Stawell
If your dates are flexible, the more temperate months of February and January tend to be the most comfortable for visiting Stawell. That said, September — with days averaging 15.8°C and nights around 4.8°C (mean 10.3°C) and moderate rainfall (56 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 | 16.1°C | 10.7°C | 5.3°C | 22.2°C | 0.2°C | 32 mm | 78% | 2.6 m/s | 4 |
| 2024 | 16.6°C | 11.0°C | 5.5°C | 21.9°C | 1.5°C | 50 mm | 75% | 2.7 m/s | 3.8 |
| 2023 🔥 | 18.9°C | 12.4°C | 5.9°C | 26.9°C | 1.2°C | 20 mm | 72% | 2.1 m/s | 4.7 |
| 2022 | 14.9°C | 10.0°C | 5.1°C | 19.2°C | 0.8°C | 80 mm | 84% | 2.3 m/s | 3.4 |
| 2021 | 15.6°C | 10.3°C | 5.1°C | 22.8°C | 1.3°C | 67 mm | 81% | 2.3 m/s | 4.1 |
| 2020 | 15.8°C | 10.6°C | 5.4°C | 22.1°C | 0.8°C | 74 mm | 80% | 2.5 m/s | 4.1 |
| 2019 | 15.5°C | 9.8°C | 4.0°C | 22.8°C | -0.6°C | 45 mm | 78% | 2.1 m/s | 4.2 |
| 2018 | 15.5°C | 9.4°C | 3.2°C | 22.0°C | 0.4°C | 18 mm | 76% | 2.2 m/s | 4.5 |
| 2017 | 15.1°C | 10.0°C | 4.8°C | 23.0°C | 0.9°C | 53 mm | 78% | 2.8 m/s | 4 |
| 2016 🌧️ | 14.5°C | 9.8°C | 5.1°C | 20.3°C | 3.2°C | 147 mm | 84% | 2.2 m/s | 3.7 |
| 2015 | 17.2°C | 10.9°C | 4.6°C | 25.5°C | 0.7°C | 41 mm | 74% | 2.1 m/s | 4 |
| 2014 | 17.3°C | 11.3°C | 5.3°C | 26.4°C | 1.7°C | 28 mm | 76% | 2.2 m/s | 4.3 |
| 2013 | 16.9°C | 11.8°C | 6.7°C | 22.6°C | 2.5°C | 67 mm | 83% | 2.5 m/s | 3.7 |
| 2012 | 16.1°C | 10.6°C | 5.1°C | 23.5°C | 1.4°C | 49 mm | 78% | 2.4 m/s | 4.1 |
| 2011 | 16.5°C | 10.8°C | 5.2°C | 25.4°C | 1.6°C | 39 mm | 77% | 2.4 m/s | 4.1 |
| 2010 | 13.9°C | 9.3°C | 4.6°C | 16.6°C | 0.6°C | 61 mm | 85% | 2.1 m/s | 3.6 |
| 2009 | 16.0°C | 10.5°C | 5.0°C | 24.0°C | 2.6°C | 76 mm | 78% | 2.6 m/s | 3.8 |
| 2008 | 16.2°C | 10.2°C | 4.2°C | 25.7°C | 0.9°C | 37 mm | 76% | 2.3 m/s | 4.3 |
| 2007 | 16.5°C | 10.6°C | 4.6°C | 22.9°C | 1.1°C | 41 mm | 73% | 2.7 m/s | 4.2 |
| 2006 | 18.2°C | 11.5°C | 4.8°C | 27.1°C | 0.8°C | 42 mm | 68% | 2.5 m/s | 4.3 |
| 2005 | 16.2°C | 10.9°C | 5.6°C | 23.8°C | 0.9°C | 43 mm | 77% | 2.2 m/s | 3.9 |
| 2004 | 15.4°C | 10.4°C | 5.4°C | 24.7°C | 2.3°C | 46 mm | 82% | 2 m/s | 3.7 |
| 2003 | 14.4°C | 9.1°C | 3.9°C | 21.9°C | -0.6°C | 45 mm | 82% | 2.8 m/s | 4.1 |
| 2002 | 16.7°C | 10.5°C | 4.4°C | 24.9°C | 0.3°C | 44 mm | 70% | 2.9 m/s | 4 |
| 2001 | 17.2°C | 11.5°C | 5.9°C | 26.5°C | 1.4°C | 82 mm | 79% | 2.3 m/s | 3.9 |
| 2000 | 15.8°C | 10.7°C | 5.5°C | 22.3°C | 2.3°C | 81 mm | 84% | 2.7 m/s | 3.7 |
| 1999 | 17.9°C | 12.0°C | 6.1°C | 25.6°C | 1.9°C | 31 mm | 75% | 2.3 m/s | 4.3 |
| 1998 | 16.9°C | 11.2°C | 5.6°C | 23.6°C | 1.3°C | 67 mm | 80% | 2.5 m/s | 4 |
| 1997 | 16.0°C | 10.4°C | 4.9°C | 18.6°C | 1.6°C | 93 mm | 81% | 1.9 m/s | 4.2 |
| 1996 | 13.9°C | 9.1°C | 4.3°C | 22.5°C | -0.2°C | 108 mm | 82% | 3 m/s | 3.9 |
| 1995 | 14.9°C | 9.6°C | 4.4°C | 19.3°C | -0.8°C | 27 mm | 82% | 2.1 m/s | 4 |
| 1994 | 14.4°C | 8.7°C | 3.0°C | 19.4°C | -0.2°C | 30 mm | 76% | 2.3 m/s | 3.9 |
| 1993 | 16.0°C | 10.5°C | 5.1°C | 24.4°C | 0.6°C | 76 mm | 81% | 2.3 m/s | 4.1 |
| 1992 ❄️ | 12.6°C | 8.2°C | 3.7°C | 15.5°C | 0.2°C | 104 mm | 87% | 2.1 m/s | 3.7 |
| 1991 | 14.5°C | 9.6°C | 4.7°C | 18.9°C | 1.1°C | 78 mm | 84% | 2.4 m/s | 4.1 |
| 1990 | 16.0°C | 10.4°C | 4.8°C | 23.8°C | 0.5°C | 40 mm | 79% | 2.4 m/s | 4.4 |
| 1989 | 15.3°C | 9.8°C | 4.2°C | 21.2°C | 1.6°C | 50 mm | 82% | 2.4 m/s | 4.4 |
| 1988 | 16.2°C | 10.8°C | 5.4°C | 21.3°C | 1.5°C | 74 mm | 80% | 2.4 m/s | 3.9 |
| 1987 | 16.8°C | 10.9°C | 5.0°C | 28.2°C | 0.5°C | 19 mm | 78% | 2.2 m/s | 4 |
| 1986 | 14.9°C | 9.8°C | 4.8°C | 20.2°C | 1.7°C | 62 mm | 84% | 2.5 m/s | 3.8 |
| 1985 | 15.5°C | 9.7°C | 3.9°C | 21.6°C | 0.8°C | 31 mm | 78% | 2.2 m/s | 4.5 |
| 1984 | 13.4°C | 8.6°C | 3.7°C | 19.0°C | 0.3°C | 79 mm | 82% | 2.5 m/s | 3.9 |
| 1983 | 14.5°C | 9.5°C | 4.6°C | 21.5°C | 0.1°C | 93 mm | 84% | 2.6 m/s | — |
| 1982 | 17.3°C | 10.5°C | 3.7°C | 26.1°C | -0.4°C | 27 mm | 67% | 2.4 m/s | — |
| 1981 | 16.2°C | 10.9°C | 5.6°C | 24.6°C | 3.0°C | 31 mm | 83% | 2.3 m/s | — |
Actual recorded September data for each year, 1981–2025 — sourced from NASA POWER.
The average high in September is around 15.8°C with lows near 4.8°C (mean 10.3°C), based on 45 years of NASA POWER data.
September averages 56 mm of rainfall in Stawell, a relatively wet time of year. The wettest on record was 147 mm in 2016.
The hottest September reached 28.2°C in 1987. The coldest dipped to -0.8°C in 1995.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average September temperatures have risen by about 1.1°C. Daytime highs moved from 15.4°C to 16.4°C and overnight lows from 4.3°C to 5.4°C over the same span.
September is one of the cooler months of the year in Stawell and a relatively wet time of year, so plan for around 15.8°C daytime highs and 4.8°C at night.
Not quite — September is the 4th coolest month in Stawell, averaging 10.3°C.
For September in Stawell, pack warm layers and a jacket for chilly mornings, with typical highs of 15.8°C and lows of 4.8°C. Bring an umbrella or light rain jacket too.
Relative humidity in September averages 79% — quite humid.
Average wind speed in September is 2.4 m/s. The windiest September on record averaged 3 m/s (1996).
The wettest September on record was 2016 with 147 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 Stawell 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.
