September is one of the cooler months of the year in Wallaroo, with average highs near 17.8°C and lows around 10.8°C (mean 14.3°C). It is about average for rainfall, averaging 35 mm of rainfall and 70% relative humidity across the period.
September is one of the cooler months of the year in Wallaroo. Across 45 years of records, the warmest September in Wallaroo was 2023 — when the month averaged 16.6°C — while the coldest was 1984 at 12°C. Typical September days reach 17.8°C with nights near 10.8°C. The long-term trend is warming, about 0.3°C per decade.
September is about average for rainfall in Wallaroo, averaging 35 mm of rainfall. The wettest September on record was 2016 with 124 mm, while the driest was 2006 at 8 mm.
Relative humidity in Wallaroo during September averages 70%. The most humid September was 2010 at 79%, and the least humid was 2023 at 63%.
September receives about 5.1 kWh/m²/day of solar energy in Wallaroo. The sunniest September was 2023 at 5.7 kWh/m²/day, and the cloudiest was 2010 at 4.3.
Average wind speed in Wallaroo during September is 4.9 m/s. The windiest September was 1996 at 6 m/s, while the calmest was 1997 at 4.2 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 13.8°C | 14.0°C | 14.6°C | 14.3°C | 15.0°C | +1.2°C |
| Avg High | 17.2°C | 17.3°C | 18.1°C | 17.8°C | 18.6°C | +1.4°C |
| Avg Low | 10.3°C | 10.6°C | 11.0°C | 10.9°C | 11.4°C | +1.1°C |
| Avg Rain | 27 mm | 48 mm | 34 mm | 38 mm | 24 mm | -3 mm |
September temperatures in Wallaroo have risen by about 1.3°C between 1981–1985 and 2021–2025.
September has ranged from a record low of 6.5°C (1982) to a record high of 29.1°C (2023).
Rainfall in September is about average for rainfall, averaging 35 mm, with a wettest year of 124 mm.
A quieter season to visit Wallaroo
If your dates are flexible, the more temperate months of March and January tend to be the most comfortable for visiting Wallaroo. That said, September — with days averaging 17.8°C and nights around 10.8°C (mean 14.3°C) and moderate rainfall (35 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 | 18.4°C | 14.9°C | 11.4°C | 26.0°C | 9.4°C | 18 mm | 70% | 4.9 m/s | 5.2 |
| 2024 | 18.6°C | 14.8°C | 11.0°C | 27.2°C | 7.4°C | 11 mm | 68% | 4.9 m/s | 5.2 |
| 2023 🔥 | 20.8°C | 16.6°C | 12.4°C | 29.1°C | 9.2°C | 8 mm | 63% | 4.3 m/s | 5.7 |
| 2022 | 16.6°C | 13.6°C | 10.5°C | 22.2°C | 8.4°C | 50 mm | 76% | 5 m/s | 4.8 |
| 2021 | 18.3°C | 14.7°C | 11.0°C | 26.8°C | 8.3°C | 16 mm | 67% | 5 m/s | 5.3 |
| 2020 | 19.0°C | 15.4°C | 11.8°C | 26.3°C | 8.0°C | 40 mm | 68% | 5.5 m/s | 4.9 |
| 2019 | 18.2°C | 14.4°C | 10.7°C | 25.9°C | 7.6°C | 11 mm | 66% | 4.6 m/s | 5.3 |
| 2018 | 17.3°C | 13.6°C | 9.9°C | 24.3°C | 7.2°C | 11 mm | 66% | 4.5 m/s | 5.5 |
| 2017 | 18.0°C | 14.7°C | 11.3°C | 27.0°C | 8.6°C | 26 mm | 69% | 5.4 m/s | 5.1 |
| 2016 🌧️ | 15.7°C | 13.0°C | 10.3°C | 22.0°C | 8.4°C | 124 mm | 75% | 5.3 m/s | 4.9 |
| 2015 | 17.2°C | 13.8°C | 10.4°C | 24.7°C | 7.9°C | 26 mm | 71% | 4.5 m/s | 5.3 |
| 2014 | 18.7°C | 15.0°C | 11.3°C | 26.6°C | 8.3°C | 19 mm | 70% | 4.8 m/s | 5.5 |
| 2013 | 19.9°C | 16.3°C | 12.8°C | 24.9°C | 9.6°C | 38 mm | 73% | 5 m/s | 5 |
| 2012 | 18.1°C | 14.4°C | 10.6°C | 25.6°C | 8.6°C | 16 mm | 68% | 5.2 m/s | 5.2 |
| 2011 | 18.9°C | 15.1°C | 11.3°C | 25.8°C | 8.9°C | 24 mm | 67% | 5.2 m/s | 5.4 |
| 2010 | 15.7°C | 13.0°C | 10.3°C | 18.3°C | 7.8°C | 82 mm | 79% | 4.5 m/s | 4.3 |
| 2009 | 18.4°C | 14.9°C | 11.4°C | 26.0°C | 8.5°C | 59 mm | 69% | 5.6 m/s | 5 |
| 2008 | 18.7°C | 14.6°C | 10.5°C | 28.5°C | 7.2°C | 14 mm | 67% | 4.9 m/s | 5.5 |
| 2007 | 19.2°C | 15.2°C | 11.3°C | 27.3°C | 7.3°C | 16 mm | 65% | 5.3 m/s | 5.4 |
| 2006 | 19.1°C | 15.2°C | 11.2°C | 26.0°C | 8.2°C | 8 mm | 64% | 5.2 m/s | 5.5 |
| 2005 | 17.8°C | 14.5°C | 11.2°C | 24.9°C | 9.0°C | 60 mm | 72% | 4.8 m/s | 5 |
| 2004 | 17.0°C | 13.8°C | 10.6°C | 25.3°C | 7.8°C | 37 mm | 74% | 4.3 m/s | 4.9 |
| 2003 | 17.0°C | 13.7°C | 10.4°C | 24.8°C | 7.7°C | 30 mm | 72% | 5.6 m/s | 5 |
| 2002 | 17.9°C | 14.4°C | 10.8°C | 26.4°C | 7.0°C | 18 mm | 67% | 5.7 m/s | 5.3 |
| 2001 | 18.4°C | 14.8°C | 11.3°C | 26.0°C | 8.5°C | 62 mm | 74% | 5.1 m/s | 4.7 |
| 2000 | 17.9°C | 14.7°C | 11.5°C | 26.7°C | 9.3°C | 33 mm | 76% | 5 m/s | 5.1 |
| 1999 | 19.3°C | 15.6°C | 11.9°C | 27.0°C | 8.6°C | 42 mm | 68% | 5.1 m/s | 5.1 |
| 1998 | 18.6°C | 14.9°C | 11.2°C | 26.3°C | 8.3°C | 33 mm | 71% | 4.7 m/s | 5.2 |
| 1997 | 17.1°C | 14.1°C | 11.0°C | 20.3°C | 8.0°C | 72 mm | 76% | 4.2 m/s | 4.5 |
| 1996 | 16.8°C | 13.5°C | 10.2°C | 24.8°C | 6.7°C | 68 mm | 72% | 6 m/s | 5.1 |
| 1995 | 17.4°C | 13.9°C | 10.4°C | 23.5°C | 6.9°C | 43 mm | 71% | 4.4 m/s | 5 |
| 1994 | 16.2°C | 13.2°C | 10.2°C | 22.7°C | 8.1°C | 14 mm | 70% | 4.4 m/s | 5.5 |
| 1993 | 17.6°C | 14.2°C | 10.7°C | 25.6°C | 7.8°C | 49 mm | 70% | 4.6 m/s | 5.2 |
| 1992 | 14.7°C | 12.1°C | 9.6°C | 20.3°C | 7.6°C | 94 mm | 77% | 4.6 m/s | 4.9 |
| 1991 | 17.7°C | 14.1°C | 10.5°C | 23.6°C | 8.4°C | 31 mm | 72% | 5.2 m/s | 5.1 |
| 1990 | 17.9°C | 14.2°C | 10.5°C | 26.0°C | 8.6°C | 31 mm | 71% | 5 m/s | 5.3 |
| 1989 | 16.8°C | 13.4°C | 10.0°C | 24.7°C | 7.7°C | 26 mm | 74% | 5 m/s | 5.4 |
| 1988 | 18.7°C | 15.0°C | 11.3°C | 26.6°C | 9.0°C | 31 mm | 64% | 5.3 m/s | 5.5 |
| 1987 | 17.9°C | 14.2°C | 10.6°C | 27.6°C | 7.4°C | 17 mm | 70% | 4.4 m/s | 5.1 |
| 1986 | 16.6°C | 13.4°C | 10.3°C | 22.5°C | 6.8°C | 38 mm | 74% | 4.9 m/s | 5.2 |
| 1985 | 16.2°C | 12.9°C | 9.6°C | 21.2°C | 7.3°C | 21 mm | 70% | 5.1 m/s | 5.3 |
| 1984 ❄️ | 14.9°C | 12.0°C | 9.2°C | 21.6°C | 6.8°C | 46 mm | 72% | 5.3 m/s | 4.8 |
| 1983 | 17.7°C | 14.1°C | 10.5°C | 25.6°C | 7.4°C | 34 mm | 73% | 5 m/s | — |
| 1982 | 17.1°C | 13.6°C | 10.1°C | 25.0°C | 6.5°C | 18 mm | 66% | 4.7 m/s | — |
| 1981 | 19.2°C | 15.3°C | 11.4°C | 26.9°C | 8.2°C | 12 mm | 69% | 4.6 m/s | — |
Actual recorded September data for each year, 1981–2025 — sourced from NASA POWER.
The average high in September is around 17.8°C with lows near 10.8°C (mean 14.3°C), based on 45 years of NASA POWER data.
September averages 35 mm of rainfall in Wallaroo, about average for rainfall. The wettest on record was 124 mm in 2016.
The hottest September reached 29.1°C in 2023. The coldest dipped to 6.5°C in 1982.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average September temperatures have risen by about 1.3°C. Daytime highs moved from 17°C to 18.5°C and overnight lows from 10.2°C to 11.3°C over the same span.
September is one of the cooler months of the year in Wallaroo and about average for rainfall, so plan for around 17.8°C daytime highs and 10.8°C at night.
Not quite — September is the 4th coolest month in Wallaroo, averaging 14.3°C.
For September in Wallaroo, pack light layers you can adjust through the day, with typical highs of 17.8°C and lows of 10.8°C.
Relative humidity in September averages 70% — moderately humid.
Average wind speed in September is 4.9 m/s. The windiest September on record averaged 6 m/s (1996).
The wettest September on record was 2016 with 124 mm. On average, September sees 35 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 Wallaroo 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.
