September is one of the cooler months of the year in Armidale, with average highs near 18.1°C and lows around 5.1°C (mean 11.6°C). It is one of the drier months, averaging 45 mm of rainfall and 68% relative humidity across the period.
September is one of the cooler months of the year in Armidale. Across 45 years of records, the warmest September in Armidale was 2023 — when the month averaged 14.7°C — while the coldest was 1984 at 8.3°C. Typical September days reach 18.1°C with nights near 5.1°C. The long-term trend is warming, about 0.5°C per decade.
September is one of the drier months in Armidale, averaging 45 mm of rainfall. The wettest September on record was 1998 with 126 mm, while the driest was 2019 at 4 mm.
Relative humidity in Armidale during September averages 68%. The most humid September was 1998 at 85%, and the least humid was 2019 at 46%.
September receives about 5.4 kWh/m²/day of solar energy in Armidale. The sunniest September was 2003 at 6.1 kWh/m²/day, and the cloudiest was 2016 at 4.3.
Average wind speed in Armidale during September is 2.2 m/s. The windiest September was 1996 at 2.9 m/s, while the calmest were 1999, 2004 and 2023 at 1.8 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 10.6°C | 10.8°C | 12.4°C | 12.0°C | 12.4°C | +1.8°C |
| Avg High | 16.9°C | 17.1°C | 19.0°C | 18.6°C | 19.0°C | +2.1°C |
| Avg Low | 4.3°C | 4.5°C | 5.8°C | 5.4°C | 5.8°C | +1.5°C |
| Avg Rain | 48 mm | 57 mm | 44 mm | 39 mm | 36 mm | -11 mm |
September temperatures in Armidale have risen by about 1.8°C between 1981–1985 and 2021–2025.
September has ranged from a record low of -3.8°C (1995) to a record high of 29.3°C (2017).
Rainfall in September is one of the drier months, averaging 45 mm, with a wettest year of 126 mm.
A good time to visit Armidale
September is a good time to visit Armidale, with days averaging 18.1°C and nights around 5.1°C (mean 11.6°C, cooler than Armidale's yearly average) and moderate rainfall. January and February 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 | 18.9°C | 12.4°C | 5.9°C | 25.6°C | 2.5°C | 33 mm | 68% | 1.9 m/s | 5.4 |
| 2024 | 20.3°C | 13.1°C | 5.8°C | 25.5°C | 0.8°C | 25 mm | 59% | 2.2 m/s | 5.5 |
| 2023 🔥 | 22.6°C | 14.7°C | 6.7°C | 28.5°C | 0.2°C | 5 mm | 54% | 1.8 m/s | 5.9 |
| 2022 | 15.9°C | 10.9°C | 5.9°C | 19.6°C | 1.3°C | 87 mm | 78% | 2.3 m/s | 4.6 |
| 2021 | 17.3°C | 10.8°C | 4.4°C | 20.9°C | -0.8°C | 41 mm | 71% | 2.1 m/s | 5.5 |
| 2020 | 19.0°C | 12.6°C | 6.3°C | 24.1°C | 0.3°C | 26 mm | 69% | 2.3 m/s | 5.3 |
| 2019 | 21.4°C | 13.6°C | 5.9°C | 26.1°C | -0.1°C | 4 mm | 46% | 2.4 m/s | 5.8 |
| 2018 | 18.3°C | 11.9°C | 5.4°C | 24.2°C | -0.1°C | 54 mm | 68% | 2.1 m/s | 5.4 |
| 2017 | 20.8°C | 13.0°C | 5.3°C | 29.3°C | -0.5°C | 5 mm | 50% | 2.6 m/s | 5.9 |
| 2016 | 16.3°C | 10.9°C | 5.4°C | 19.6°C | 0.6°C | 74 mm | 79% | 2.7 m/s | 4.3 |
| 2015 | 17.2°C | 11.1°C | 5.1°C | 22.3°C | 0.4°C | 26 mm | 70% | 2 m/s | 5.3 |
| 2014 | 17.1°C | 11.1°C | 5.1°C | 26.1°C | -0.1°C | 26 mm | 73% | 2.1 m/s | 5.6 |
| 2013 | 21.8°C | 14.3°C | 6.9°C | 29.0°C | 1.6°C | 29 mm | 57% | 2.2 m/s | 6 |
| 2012 | 19.3°C | 11.9°C | 4.5°C | 25.8°C | -1.2°C | 23 mm | 60% | 2.2 m/s | 5.7 |
| 2011 | 16.9°C | 10.8°C | 4.7°C | 22.5°C | 0.4°C | 71 mm | 73% | 2.2 m/s | 5.3 |
| 2010 | 16.7°C | 11.2°C | 5.7°C | 20.5°C | -1.6°C | 73 mm | 80% | 2.2 m/s | 4.5 |
| 2009 | 19.1°C | 12.4°C | 5.7°C | 24.3°C | 0.2°C | 53 mm | 65% | 2.4 m/s | 5.5 |
| 2008 | 18.4°C | 12.4°C | 6.4°C | 25.8°C | 1.0°C | 71 mm | 72% | 2.3 m/s | 5.3 |
| 2007 | 17.1°C | 11.1°C | 5.1°C | 23.6°C | 1.0°C | 24 mm | 70% | 2.2 m/s | 5.7 |
| 2006 | 19.1°C | 12.8°C | 6.5°C | 26.1°C | 2.2°C | 53 mm | 70% | 2.3 m/s | 5.5 |
| 2005 | 17.9°C | 11.8°C | 5.6°C | 23.3°C | 0.6°C | 101 mm | 72% | 2.3 m/s | 5 |
| 2004 | 18.3°C | 11.8°C | 5.2°C | 27.5°C | -3.1°C | 57 mm | 66% | 1.8 m/s | 5.6 |
| 2003 | 20.1°C | 12.5°C | 4.9°C | 28.7°C | -0.8°C | 8 mm | 54% | 2.6 m/s | 6.1 |
| 2002 | 20.4°C | 13.1°C | 5.7°C | 27.6°C | 0.9°C | 32 mm | 57% | 2.4 m/s | 5.3 |
| 2001 | 18.4°C | 11.9°C | 5.4°C | 25.2°C | 2.2°C | 27 mm | 72% | 2 m/s | 5 |
| 2000 | 21.0°C | 14.0°C | 7.0°C | 29.2°C | 0.5°C | 16 mm | 59% | 2.5 m/s | 5.4 |
| 1999 | 17.4°C | 11.7°C | 5.9°C | 22.8°C | -1.6°C | 64 mm | 75% | 1.8 m/s | 5.4 |
| 1998 🌧️ | 17.2°C | 12.2°C | 7.2°C | 23.8°C | 0.7°C | 126 mm | 85% | 2 m/s | 4.9 |
| 1997 | 17.7°C | 11.6°C | 5.5°C | 22.1°C | 2.2°C | 87 mm | 70% | 2.1 m/s | 4.9 |
| 1996 | 16.7°C | 10.5°C | 4.3°C | 24.9°C | -0.1°C | 59 mm | 71% | 2.9 m/s | 5.1 |
| 1995 | 17.2°C | 10.8°C | 4.4°C | 21.9°C | -3.8°C | 96 mm | 71% | 1.9 m/s | 5 |
| 1994 | 18.1°C | 10.4°C | 2.7°C | 22.9°C | -1.8°C | 15 mm | 52% | 2.4 m/s | 5.8 |
| 1993 | 17.1°C | 10.6°C | 4.2°C | 23.5°C | -0.4°C | 41 mm | 71% | 2.1 m/s | 5.3 |
| 1992 | 16.3°C | 9.6°C | 2.8°C | 23.2°C | -2.7°C | 31 mm | 64% | 2.6 m/s | 5.1 |
| 1991 | 18.0°C | 10.9°C | 3.8°C | 23.0°C | -2.5°C | 16 mm | 55% | 2.7 m/s | 5.6 |
| 1990 | 15.0°C | 9.7°C | 4.5°C | 20.5°C | 0.3°C | 38 mm | 82% | 1.9 m/s | 5.2 |
| 1989 | 15.9°C | 9.1°C | 2.4°C | 22.3°C | -3.2°C | 11 mm | 73% | 2.2 m/s | 5.9 |
| 1988 | 16.9°C | 11.5°C | 6.2°C | 24.2°C | 0.6°C | 90 mm | 79% | 2.5 m/s | 4.9 |
| 1987 | 17.3°C | 10.6°C | 3.9°C | 24.2°C | -2.6°C | 17 mm | 66% | 1.9 m/s | 5.8 |
| 1986 | 17.4°C | 11.2°C | 4.9°C | 24.6°C | -2.0°C | 58 mm | 72% | 2.2 m/s | 5.1 |
| 1985 | 14.8°C | 9.3°C | 3.7°C | 19.8°C | -0.6°C | 54 mm | 77% | 2 m/s | 5.1 |
| 1984 ❄️ | 14.4°C | 8.3°C | 2.2°C | 18.6°C | -3.1°C | 44 mm | 73% | 2.5 m/s | 5.3 |
| 1983 | 17.7°C | 11.7°C | 5.7°C | 23.0°C | 0.3°C | 59 mm | 79% | 2.5 m/s | — |
| 1982 | 17.8°C | 10.9°C | 4.1°C | 23.7°C | -1.6°C | 51 mm | 60% | 2.4 m/s | — |
| 1981 | 19.8°C | 12.6°C | 5.4°C | 26.2°C | -1.1°C | 44 mm | 64% | 2 m/s | — |
Actual recorded September data for each year, 1981–2025 — sourced from NASA POWER.
The average high in September is around 18.1°C with lows near 5.1°C (mean 11.6°C), based on 45 years of NASA POWER data.
September averages 45 mm of rainfall in Armidale, one of the drier months. The wettest on record was 126 mm in 1998.
The hottest September reached 29.3°C in 2017. The coldest dipped to -3.8°C in 1995.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average September temperatures have risen by about 1.8°C. Daytime highs moved from 16.9°C to 19°C and overnight lows from 4.2°C to 5.7°C over the same span.
September is one of the cooler months of the year in Armidale and one of the drier months, so plan for around 18.1°C daytime highs and 5.1°C at night.
Not quite — September is the 5th coolest month in Armidale, averaging 11.6°C.
For September in Armidale, pack warm layers and a jacket for chilly mornings, with typical highs of 18.1°C and lows of 5.1°C.
Relative humidity in September averages 68% — moderately humid.
Average wind speed in September is 2.2 m/s. The windiest September on record averaged 2.9 m/s (1996).
The wettest September on record was 1998 with 126 mm. On average, September sees 45 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 Armidale 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.
