September is one of the cooler months of the year in Oatlands, with average highs near 12.6°C and lows around 3.1°C (mean 7.9°C). It is about average for rainfall, averaging 56 mm of rainfall and 82% relative humidity across the period.
September is one of the cooler months of the year in Oatlands. Across 45 years of records, the warmest September in Oatlands was 2023 — when the month averaged 9.9°C — while the coldest were 1992 and 2003 at 5.8°C. Typical September days reach 12.6°C with nights near 3.1°C. The long-term trend is warming, about 0.3°C per decade.
September is about average for rainfall in Oatlands, averaging 56 mm of rainfall. The wettest September on record was 2009 with 157 mm, while the driest was 2018 at 20 mm.
Relative humidity in Oatlands during September averages 82%. The most humid September was 1984 at 87%, and the least humid was 2023 at 75%.
September receives about 3.8 kWh/m²/day of solar energy in Oatlands. The sunniest September was 2023 at 4.2 kWh/m²/day, and the cloudiest were 2009 and 2022 at 3.4.
Average wind speed in Oatlands during September is 1.9 m/s. The windiest September was 2025 at 2.6 m/s, while the calmest were 2015 and 2016 at 1.4 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 7.7°C | 7.2°C | 8.0°C | 8.2°C | 8.3°C | +0.6°C |
| Avg High | 12.4°C | 12.0°C | 12.7°C | 13.1°C | 13.2°C | +0.8°C |
| Avg Low | 3.0°C | 2.5°C | 3.2°C | 3.3°C | 3.5°C | +0.5°C |
| Avg Rain | 63 mm | 53 mm | 69 mm | 47 mm | 43 mm | -20 mm |
September temperatures in Oatlands have risen by about 1°C between 1981–1985 and 2021–2025.
September has ranged from a record low of -3.4°C (1992) to a record high of 24.4°C (1987).
Rainfall in September is about average for rainfall, averaging 56 mm, with a wettest year of 157 mm.
A quieter season to visit Oatlands
If your dates are flexible, the more temperate months of February and January tend to be the most comfortable for visiting Oatlands. That said, September — with days averaging 12.6°C and nights around 3.1°C (mean 7.9°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 | 12.5°C | 8.0°C | 3.5°C | 17.6°C | -1.2°C | 41 mm | 77% | 2.6 m/s | 3.8 |
| 2024 | 12.7°C | 8.1°C | 3.4°C | 19.1°C | -0.2°C | 41 mm | 78% | 2.5 m/s | 3.7 |
| 2023 🔥 | 15.7°C | 9.9°C | 4.2°C | 23.5°C | -0.1°C | 22 mm | 75% | 2 m/s | 4.2 |
| 2022 | 12.4°C | 7.9°C | 3.4°C | 19.6°C | -1.1°C | 89 mm | 86% | 1.5 m/s | 3.4 |
| 2021 | 12.7°C | 7.9°C | 3.1°C | 20.2°C | 0.1°C | 39 mm | 79% | 2.1 m/s | 3.9 |
| 2020 | 12.9°C | 8.2°C | 3.6°C | 19.8°C | -0.8°C | 24 mm | 83% | 2 m/s | 3.8 |
| 2019 | 13.7°C | 8.2°C | 2.7°C | 22.0°C | -1.8°C | 46 mm | 78% | 1.8 m/s | 3.9 |
| 2018 | 13.5°C | 8.1°C | 2.7°C | 17.8°C | -1.0°C | 20 mm | 78% | 1.9 m/s | 4.1 |
| 2017 | 12.5°C | 7.5°C | 2.5°C | 17.5°C | -0.7°C | 31 mm | 78% | 2.2 m/s | 3.7 |
| 2016 | 13.4°C | 8.7°C | 4.1°C | 18.1°C | 1.0°C | 70 mm | 84% | 1.4 m/s | 3.5 |
| 2015 | 13.8°C | 8.8°C | 3.7°C | 21.2°C | -1.7°C | 23 mm | 81% | 1.4 m/s | 3.8 |
| 2014 | 14.2°C | 9.0°C | 3.8°C | 21.3°C | 0.2°C | 32 mm | 79% | 1.8 m/s | 3.9 |
| 2013 | 13.2°C | 8.7°C | 4.3°C | 18.4°C | -2.6°C | 71 mm | 83% | 1.9 m/s | 3.6 |
| 2012 | 12.8°C | 8.3°C | 3.8°C | 18.5°C | -0.6°C | 68 mm | 83% | 2.1 m/s | 3.5 |
| 2011 | 12.8°C | 7.7°C | 2.7°C | 18.9°C | 0.0°C | 44 mm | 83% | 2 m/s | 3.8 |
| 2010 | 10.9°C | 6.7°C | 2.4°C | 15.0°C | -1.5°C | 69 mm | 82% | 2.4 m/s | 3.8 |
| 2009 🌧️ | 12.0°C | 7.8°C | 3.6°C | 16.4°C | 0.4°C | 157 mm | 87% | 2 m/s | 3.4 |
| 2008 | 13.1°C | 7.6°C | 2.2°C | 17.8°C | -1.5°C | 48 mm | 77% | 2.2 m/s | 3.8 |
| 2007 | 13.2°C | 8.1°C | 3.0°C | 17.4°C | -0.7°C | 42 mm | 81% | 1.9 m/s | 3.7 |
| 2006 | 13.6°C | 8.5°C | 3.4°C | 21.0°C | -0.2°C | 49 mm | 77% | 2 m/s | 4 |
| 2005 | 13.2°C | 8.4°C | 3.6°C | 19.0°C | -0.2°C | 105 mm | 85% | 1.5 m/s | 3.7 |
| 2004 | 12.9°C | 8.4°C | 3.9°C | 18.0°C | -1.4°C | 39 mm | 84% | 1.5 m/s | 3.8 |
| 2003 | 10.3°C | 5.8°C | 1.2°C | 14.5°C | -1.6°C | 87 mm | 84% | 2.4 m/s | 3.9 |
| 2002 | 11.9°C | 7.5°C | 3.1°C | 19.4°C | -0.2°C | 68 mm | 80% | 2.5 m/s | 3.7 |
| 2001 | 14.6°C | 9.5°C | 4.5°C | 20.0°C | 0.1°C | 44 mm | 83% | 1.6 m/s | 3.7 |
| 2000 | 12.4°C | 8.0°C | 3.5°C | 17.7°C | -0.3°C | 54 mm | 82% | 2.3 m/s | 3.7 |
| 1999 | 14.4°C | 9.3°C | 4.2°C | 21.0°C | -0.5°C | 23 mm | 81% | 1.6 m/s | 3.6 |
| 1998 | 14.0°C | 9.2°C | 4.4°C | 18.7°C | -1.4°C | 59 mm | 81% | 2 m/s | 3.8 |
| 1997 | 11.6°C | 7.6°C | 3.6°C | 15.5°C | 0.0°C | 72 mm | 85% | 1.5 m/s | 3.7 |
| 1996 | 10.8°C | 6.3°C | 1.9°C | 15.4°C | -1.2°C | 96 mm | 83% | 2.1 m/s | 3.5 |
| 1995 | 11.2°C | 6.3°C | 1.4°C | 16.7°C | -1.8°C | 37 mm | 83% | 1.8 m/s | 3.8 |
| 1994 | 10.3°C | 5.9°C | 1.4°C | 17.4°C | -1.4°C | 56 mm | 83% | 2.1 m/s | 3.9 |
| 1993 | 13.0°C | 8.1°C | 3.2°C | 21.5°C | -0.8°C | 50 mm | 84% | 1.6 m/s | 3.8 |
| 1992 ❄️ | 10.1°C | 5.8°C | 1.5°C | 12.9°C | -3.4°C | 56 mm | 85% | 1.6 m/s | 3.6 |
| 1991 | 11.8°C | 6.8°C | 1.7°C | 15.9°C | -1.2°C | 49 mm | 84% | 1.7 m/s | 3.9 |
| 1990 | 12.7°C | 7.2°C | 1.7°C | 17.7°C | -2.3°C | 36 mm | 83% | 1.7 m/s | 3.9 |
| 1989 | 12.5°C | 7.9°C | 3.3°C | 19.0°C | -0.6°C | 46 mm | 85% | 1.7 m/s | 3.8 |
| 1988 | 13.4°C | 8.8°C | 4.2°C | 18.5°C | -0.3°C | 68 mm | 85% | 1.9 m/s | 3.6 |
| 1987 | 13.7°C | 8.5°C | 3.3°C | 24.4°C | -0.4°C | 35 mm | 80% | 1.9 m/s | 4 |
| 1986 | 11.7°C | 7.1°C | 2.5°C | 17.0°C | -1.6°C | 46 mm | 86% | 1.6 m/s | 3.7 |
| 1985 | 12.1°C | 7.5°C | 2.8°C | 17.0°C | -0.1°C | 58 mm | 85% | 1.6 m/s | 3.8 |
| 1984 | 11.2°C | 7.1°C | 2.9°C | 14.6°C | -1.3°C | 125 mm | 87% | 1.6 m/s | 3.6 |
| 1983 | 11.3°C | 7.1°C | 2.9°C | 15.6°C | -2.8°C | 104 mm | 84% | 2 m/s | — |
| 1982 | 12.5°C | 7.1°C | 1.7°C | 18.4°C | -1.6°C | 56 mm | 81% | 1.8 m/s | — |
| 1981 | 13.3°C | 8.4°C | 3.4°C | 16.5°C | -1.1°C | 32 mm | 82% | 2.2 m/s | — |
Actual recorded September data for each year, 1981–2025 — sourced from NASA POWER.
The average high in September is around 12.6°C with lows near 3.1°C (mean 7.9°C), based on 45 years of NASA POWER data.
September averages 56 mm of rainfall in Oatlands, about average for rainfall. The wettest on record was 157 mm in 2009.
The hottest September reached 24.4°C in 1987. The coldest dipped to -3.4°C in 1992.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average September temperatures have risen by about 1°C. Daytime highs moved from 12.1°C to 13.2°C and overnight lows from 2.7°C to 3.5°C over the same span.
September is one of the cooler months of the year in Oatlands and about average for rainfall, so plan for around 12.6°C daytime highs and 3.1°C at night.
Not quite — September is the 4th coolest month in Oatlands, averaging 7.9°C.
For September in Oatlands, pack warm layers and a jacket for chilly mornings, with typical highs of 12.6°C and lows of 3.1°C. Bring an umbrella or light rain jacket too.
Relative humidity in September averages 82% — quite humid.
Average wind speed in September is 1.9 m/s. The windiest September on record averaged 2.6 m/s (2025).
The wettest September on record was 2009 with 157 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 Oatlands 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.
