September is one of the cooler months of the year in Ouyen, with average highs near 20.8°C and lows around 6.9°C (mean 13.9°C). It is about average for rainfall, averaging 28 mm of rainfall and 62% relative humidity across the period.
September is one of the cooler months of the year in Ouyen. Across 45 years of records, the warmest September in Ouyen was 2023 — when the month averaged 16.7°C — while the coldest was 1992 at 10.8°C. Typical September days reach 20.8°C with nights near 6.9°C. The long-term trend is warming, about 0.4°C per decade.
September is about average for rainfall in Ouyen, averaging 28 mm of rainfall. The wettest September on record was 1992 with 82 mm, while the driest was 2018 at 2 mm.
Relative humidity in Ouyen during September averages 62%. The most humid September was 1992 at 74%, and the least humid was 1982 at 51%.
September receives about 4.7 kWh/m²/day of solar energy in Ouyen. The sunniest September was 2018 at 5.3 kWh/m²/day, and the cloudiest were 2016 and 2022 at 4.2.
Average wind speed in Ouyen during September is 3 m/s. The windiest September was 1996 at 3.8 m/s, while the calmest was 1997 at 2.4 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 13.2°C | 13.2°C | 14.2°C | 14.1°C | 14.8°C | +1.6°C |
| Avg High | 20.2°C | 20.0°C | 21.3°C | 21.0°C | 21.9°C | +1.7°C |
| Avg Low | 6.3°C | 6.5°C | 7.0°C | 7.1°C | 7.8°C | +1.5°C |
| Avg Rain | 26 mm | 38 mm | 27 mm | 24 mm | 20 mm | -6 mm |
September temperatures in Ouyen have risen by about 1.8°C between 1981–1985 and 2021–2025.
September has ranged from a record low of 0.3°C (1995) to a record high of 34.8°C (2003).
Rainfall in September is about average for rainfall, averaging 28 mm, with a wettest year of 82 mm.
Daytime highs and overnight lows have shifted differently — highs rose about 0.5°C per decade while lows rose 0.3°C per decade, widening the gap between day and night.
A good time to visit Ouyen
September is a good time to visit Ouyen, with days averaging 20.8°C and nights around 6.9°C (mean 13.9°C, cooler than Ouyen's yearly average) and low rainfall. March and December 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 | 22.0°C | 14.9°C | 7.9°C | 29.0°C | 3.2°C | 15 mm | 58% | 3.3 m/s | 4.7 |
| 2024 | 22.4°C | 14.8°C | 7.2°C | 31.9°C | 1.8°C | 12 mm | 54% | 3.4 m/s | 4.9 |
| 2023 🔥 | 24.7°C | 16.7°C | 8.7°C | 33.9°C | 1.6°C | 3 mm | 51% | 2.6 m/s | 5.2 |
| 2022 | 19.3°C | 13.3°C | 7.4°C | 23.7°C | 3.1°C | 50 mm | 70% | 3 m/s | 4.2 |
| 2021 | 21.7°C | 14.4°C | 7.1°C | 31.5°C | 3.2°C | 26 mm | 58% | 3.1 m/s | 4.9 |
| 2020 | 21.3°C | 14.7°C | 8.2°C | 26.6°C | 1.9°C | 14 mm | 60% | 3.1 m/s | 4.7 |
| 2019 | 21.7°C | 14.1°C | 6.5°C | 31.0°C | 2.0°C | 10 mm | 56% | 3 m/s | 4.9 |
| 2018 | 21.1°C | 13.4°C | 5.8°C | 28.7°C | 3.0°C | 2 mm | 53% | 2.9 m/s | 5.3 |
| 2017 | 21.4°C | 14.4°C | 7.3°C | 32.9°C | 1.8°C | 7 mm | 54% | 3.5 m/s | 4.8 |
| 2016 | 19.2°C | 13.1°C | 6.9°C | 26.1°C | 3.0°C | 67 mm | 68% | 3.1 m/s | 4.2 |
| 2015 | 21.0°C | 13.7°C | 6.4°C | 31.6°C | 2.7°C | 13 mm | 58% | 2.6 m/s | 5 |
| 2014 | 21.4°C | 14.4°C | 7.5°C | 30.5°C | 3.5°C | 33 mm | 60% | 2.9 m/s | 5 |
| 2013 | 23.2°C | 16.4°C | 9.7°C | 30.3°C | 5.1°C | 34 mm | 61% | 3.2 m/s | 4.5 |
| 2012 | 21.6°C | 14.5°C | 7.4°C | 32.5°C | 3.6°C | 11 mm | 56% | 3.1 m/s | 4.9 |
| 2011 | 21.7°C | 14.3°C | 7.0°C | 30.8°C | 1.6°C | 21 mm | 59% | 3.1 m/s | 4.9 |
| 2010 | 18.2°C | 12.2°C | 6.2°C | 21.8°C | 2.7°C | 44 mm | 74% | 2.7 m/s | 4.4 |
| 2009 | 21.6°C | 14.4°C | 7.1°C | 32.9°C | 4.3°C | 62 mm | 58% | 3.3 m/s | 4.6 |
| 2008 | 21.5°C | 14.0°C | 6.5°C | 32.3°C | 1.8°C | 10 mm | 56% | 2.9 m/s | 5.2 |
| 2007 | 21.7°C | 14.3°C | 7.0°C | 27.7°C | 2.9°C | 10 mm | 55% | 3.2 m/s | 5.1 |
| 2006 | 22.8°C | 15.1°C | 7.4°C | 31.7°C | 3.3°C | 17 mm | 52% | 3.2 m/s | 5.1 |
| 2005 | 20.3°C | 13.8°C | 7.2°C | 28.4°C | 2.9°C | 35 mm | 63% | 2.8 m/s | 4.3 |
| 2004 | 20.2°C | 13.4°C | 6.7°C | 31.2°C | 1.2°C | 24 mm | 66% | 2.6 m/s | 4.3 |
| 2003 | 19.8°C | 12.8°C | 5.8°C | 34.8°C | 2.1°C | 20 mm | 66% | 3.5 m/s | 4.8 |
| 2002 | 21.9°C | 14.4°C | 6.9°C | 30.5°C | 0.8°C | 12 mm | 53% | 3.4 m/s | 4.8 |
| 2001 | 22.5°C | 15.3°C | 8.2°C | 32.7°C | 4.0°C | 43 mm | 60% | 3 m/s | 4.5 |
| 2000 | 20.9°C | 14.2°C | 7.4°C | 28.5°C | 3.1°C | 38 mm | 69% | 3 m/s | 4.5 |
| 1999 | 22.2°C | 15.1°C | 7.9°C | 30.4°C | 2.4°C | 13 mm | 60% | 2.9 m/s | 4.7 |
| 1998 | 22.1°C | 15.0°C | 7.9°C | 32.2°C | 3.2°C | 34 mm | 62% | 3 m/s | 4.7 |
| 1997 | 19.8°C | 13.3°C | 6.9°C | 24.7°C | 3.3°C | 53 mm | 66% | 2.4 m/s | 4.7 |
| 1996 | 19.1°C | 12.6°C | 6.1°C | 29.5°C | 0.7°C | 48 mm | 65% | 3.8 m/s | 4.5 |
| 1995 | 20.2°C | 13.2°C | 6.1°C | 26.2°C | 0.3°C | 20 mm | 66% | 2.6 m/s | 4.6 |
| 1994 | 19.5°C | 12.2°C | 5.0°C | 26.2°C | 0.6°C | 16 mm | 60% | 3 m/s | 5 |
| 1993 | 19.8°C | 13.5°C | 7.3°C | 30.9°C | 1.3°C | 65 mm | 69% | 2.9 m/s | 4.5 |
| 1992 ❄️ 🌧️ | 16.6°C | 10.8°C | 5.1°C | 22.0°C | 1.6°C | 82 mm | 74% | 2.8 m/s | 4.3 |
| 1991 | 20.1°C | 13.2°C | 6.3°C | 27.3°C | 2.4°C | 35 mm | 67% | 3.1 m/s | 4.9 |
| 1990 | 20.6°C | 13.5°C | 6.5°C | 30.8°C | 2.8°C | 12 mm | 65% | 3 m/s | 5 |
| 1989 | 19.8°C | 13.0°C | 6.2°C | 28.8°C | 2.6°C | 19 mm | 68% | 3 m/s | 4.9 |
| 1988 | 21.5°C | 14.3°C | 7.2°C | 29.7°C | 2.7°C | 53 mm | 63% | 3.1 m/s | 4.6 |
| 1987 | 21.2°C | 14.0°C | 6.8°C | 33.0°C | 1.4°C | 11 mm | 63% | 2.8 m/s | 4.8 |
| 1986 | 19.2°C | 12.7°C | 6.2°C | 25.6°C | 1.9°C | 40 mm | 72% | 2.9 m/s | 4.5 |
| 1985 | 19.2°C | 12.3°C | 5.4°C | 25.1°C | 1.7°C | 14 mm | 64% | 2.9 m/s | 5.1 |
| 1984 | 18.1°C | 11.6°C | 5.1°C | 26.6°C | 1.1°C | 24 mm | 64% | 3.3 m/s | 4.7 |
| 1983 | 19.7°C | 13.0°C | 6.3°C | 27.9°C | 2.3°C | 42 mm | 69% | 3 m/s | — |
| 1982 | 21.3°C | 13.6°C | 6.0°C | 30.1°C | 0.6°C | 9 mm | 51% | 3.1 m/s | — |
| 1981 | 21.6°C | 14.5°C | 7.4°C | 32.3°C | 4.2°C | 20 mm | 66% | 2.8 m/s | — |
Actual recorded September data for each year, 1981–2025 — sourced from NASA POWER.
The average high in September is around 20.8°C with lows near 6.9°C (mean 13.9°C), based on 45 years of NASA POWER data.
September averages 28 mm of rainfall in Ouyen, about average for rainfall. The wettest on record was 82 mm in 1992.
The hottest September reached 34.8°C in 2003. The coldest dipped to 0.3°C in 1995.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average September temperatures have risen by about 1.8°C. Daytime highs moved from 20°C to 22°C and overnight lows from 6°C to 7.7°C over the same span.
September is one of the cooler months of the year in Ouyen and about average for rainfall, so plan for around 20.8°C daytime highs and 6.9°C at night.
Not quite — September is the 5th coolest month in Ouyen, averaging 13.9°C.
For September in Ouyen, pack warm layers and a jacket for chilly mornings, with typical highs of 20.8°C and lows of 6.9°C.
Relative humidity in September averages 62% — moderately humid.
Average wind speed in September is 3 m/s. The windiest September on record averaged 3.8 m/s (1996).
The wettest September on record was 1992 with 82 mm. On average, September sees 28 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 Ouyen 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.
