September is one of the cooler months of the year in Canberra, with average highs near 15.1°C and lows around 3.6°C (mean 9.4°C). It is about average for rainfall, averaging 57 mm of rainfall and 75% relative humidity across the period.
September is one of the cooler months of the year in Canberra. Across 45 years of records, the warmest September in Canberra was 2023 — when the month averaged 12.8°C — while the coldest was 1992 at 6.8°C. Typical September days reach 15.1°C with nights near 3.6°C. The long-term trend is warming, about 0.5°C per decade.
September is about average for rainfall in Canberra, averaging 57 mm of rainfall. The wettest September on record was 1996 with 110 mm, while the driest was 2017 at 10 mm.
Relative humidity in Canberra during September averages 75%. The most humid September was 1998 at 84%, and the least humid was 2017 at 58%.
September receives about 4.8 kWh/m²/day of solar energy in Canberra. The sunniest September was 2023 at 5.5 kWh/m²/day, and the cloudiest was 2016 at 4.
Average wind speed in Canberra during September is 1.3 m/s. The windiest Septembers were 1996, 2003 and 2017 at 1.8 m/s, while the calmest was 1985 at 1 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 8.7°C | 8.6°C | 9.7°C | 9.7°C | 10.4°C | +1.7°C |
| Avg High | 14.3°C | 13.9°C | 15.6°C | 15.6°C | 16.5°C | +2.2°C |
| Avg Low | 3.1°C | 3.3°C | 3.9°C | 3.7°C | 4.4°C | +1.3°C |
| Avg Rain | 62 mm | 76 mm | 57 mm | 45 mm | 39 mm | -23 mm |
September temperatures in Canberra have risen by about 1.8°C between 1981–1985 and 2021–2025.
September has ranged from a record low of -3.9°C (1982) to a record high of 28.7°C (2017).
Rainfall in September is about average for rainfall, averaging 57 mm, with a wettest year of 110 mm.
Daytime highs and overnight lows have shifted differently — highs rose about 0.6°C per decade while lows rose 0.3°C per decade, widening the gap between day and night.
A quieter season to visit Canberra
If your dates are flexible, the more temperate months of January and February tend to be the most comfortable for visiting Canberra. That said, September — with days averaging 15.1°C and nights around 3.6°C (mean 9.4°C) and moderate rainfall (57 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 | 16.3°C | 10.1°C | 3.8°C | 21.8°C | -0.7°C | 59 mm | 70% | 1.5 m/s | 5.1 |
| 2024 | 16.9°C | 10.5°C | 4.0°C | 22.0°C | -3.0°C | 25 mm | 64% | 1.6 m/s | 5.1 |
| 2023 🔥 | 20.3°C | 12.8°C | 5.4°C | 27.5°C | -1.0°C | 14 mm | 59% | 1.2 m/s | 5.5 |
| 2022 | 13.9°C | 9.4°C | 4.9°C | 17.7°C | -1.9°C | 60 mm | 82% | 1.2 m/s | 4.1 |
| 2021 | 15.4°C | 9.4°C | 3.5°C | 20.0°C | -0.6°C | 53 mm | 73% | 1.4 m/s | 4.7 |
| 2020 | 15.9°C | 10.3°C | 4.8°C | 21.9°C | -0.6°C | 22 mm | 77% | 1.3 m/s | 4.6 |
| 2019 | 17.4°C | 10.5°C | 3.5°C | 22.5°C | -1.0°C | 33 mm | 64% | 1.3 m/s | 4.8 |
| 2018 | 16.8°C | 10.1°C | 3.4°C | 21.7°C | -0.8°C | 13 mm | 61% | 1.2 m/s | 5.1 |
| 2017 | 16.8°C | 10.0°C | 3.3°C | 28.7°C | -1.5°C | 10 mm | 58% | 1.8 m/s | 5.3 |
| 2016 | 14.2°C | 9.3°C | 4.4°C | 18.4°C | 1.4°C | 73 mm | 81% | 1.3 m/s | 4 |
| 2015 | 14.6°C | 9.1°C | 3.5°C | 19.2°C | -1.0°C | 19 mm | 78% | 1.1 m/s | 4.9 |
| 2014 | 15.1°C | 9.5°C | 3.9°C | 20.9°C | -0.5°C | 38 mm | 78% | 1.2 m/s | 4.9 |
| 2013 | 16.3°C | 10.7°C | 5.0°C | 21.4°C | -2.4°C | 100 mm | 75% | 1.4 m/s | 4.8 |
| 2012 | 15.2°C | 9.3°C | 3.4°C | 20.3°C | -2.4°C | 41 mm | 74% | 1.3 m/s | 5 |
| 2011 | 15.2°C | 9.3°C | 3.4°C | 22.2°C | -1.3°C | 49 mm | 74% | 1.4 m/s | 4.8 |
| 2010 | 14.3°C | 8.9°C | 3.6°C | 20.6°C | -1.3°C | 75 mm | 79% | 1.3 m/s | 4.8 |
| 2009 | 16.1°C | 10.1°C | 4.0°C | 22.0°C | -0.4°C | 67 mm | 70% | 1.5 m/s | 4.9 |
| 2008 | 16.4°C | 9.9°C | 3.4°C | 23.0°C | -2.7°C | 31 mm | 68% | 1.4 m/s | 5.1 |
| 2007 | 14.6°C | 8.9°C | 3.1°C | 18.5°C | 0.0°C | 26 mm | 73% | 1.4 m/s | 5 |
| 2006 | 17.1°C | 10.9°C | 4.7°C | 22.2°C | 0.3°C | 32 mm | 65% | 1.4 m/s | 5 |
| 2005 | 14.8°C | 9.3°C | 3.7°C | 21.1°C | 0.2°C | 96 mm | 79% | 1.2 m/s | 4.3 |
| 2004 | 15.6°C | 9.7°C | 3.9°C | 22.4°C | -1.0°C | 59 mm | 76% | 1.2 m/s | 4.6 |
| 2003 | 14.2°C | 8.4°C | 2.7°C | 22.1°C | -2.5°C | 50 mm | 71% | 1.8 m/s | 5.3 |
| 2002 | 15.8°C | 9.7°C | 3.7°C | 21.6°C | -1.6°C | 56 mm | 64% | 1.6 m/s | 5 |
| 2001 | 16.0°C | 10.7°C | 5.3°C | 21.8°C | 0.5°C | 61 mm | 80% | 1.1 m/s | 4.5 |
| 2000 | 15.3°C | 9.8°C | 4.3°C | 22.5°C | -1.2°C | 89 mm | 78% | 1.5 m/s | 4.8 |
| 1999 | 16.1°C | 10.6°C | 5.1°C | 20.7°C | -1.5°C | 72 mm | 77% | 1.2 m/s | 4.6 |
| 1998 | 14.9°C | 10.1°C | 5.2°C | 21.3°C | -0.4°C | 62 mm | 84% | 1.2 m/s | 4.5 |
| 1997 | 13.6°C | 8.9°C | 4.3°C | 17.1°C | -1.7°C | 106 mm | 83% | 1.1 m/s | 4.4 |
| 1996 🌧️ | 13.4°C | 8.1°C | 2.9°C | 20.8°C | -0.1°C | 110 mm | 77% | 1.8 m/s | 4.8 |
| 1995 | 14.2°C | 8.6°C | 3.1°C | 18.8°C | -3.1°C | 68 mm | 79% | 1.2 m/s | 4.4 |
| 1994 | 14.5°C | 8.0°C | 1.5°C | 19.6°C | -2.8°C | 17 mm | 64% | 1.5 m/s | 5.2 |
| 1993 | 14.3°C | 8.9°C | 3.6°C | 19.5°C | -0.9°C | 97 mm | 80% | 1.2 m/s | 4.6 |
| 1992 ❄️ | 12.0°C | 6.8°C | 1.7°C | 17.7°C | -1.9°C | 98 mm | 81% | 1.3 m/s | 4.4 |
| 1991 | 13.0°C | 7.7°C | 2.4°C | 18.3°C | -2.6°C | 62 mm | 80% | 1.5 m/s | 4.8 |
| 1990 | 13.4°C | 8.3°C | 3.3°C | 21.2°C | -0.1°C | 64 mm | 83% | 1.2 m/s | 4.7 |
| 1989 | 13.9°C | 8.0°C | 2.1°C | 20.0°C | -1.2°C | 27 mm | 80% | 1.3 m/s | 5.1 |
| 1988 | 14.1°C | 9.1°C | 4.0°C | 19.2°C | -1.3°C | 84 mm | 81% | 1.3 m/s | 4.8 |
| 1987 | 15.8°C | 9.5°C | 3.2°C | 24.7°C | -2.1°C | 28 mm | 73% | 1.3 m/s | 5.1 |
| 1986 | 14.1°C | 8.8°C | 3.6°C | 20.7°C | 0.5°C | 55 mm | 80% | 1.3 m/s | 4.6 |
| 1985 | 13.5°C | 8.2°C | 2.8°C | 19.1°C | -1.1°C | 98 mm | 80% | 1 m/s | 4.8 |
| 1984 | 12.3°C | 7.4°C | 2.4°C | 18.4°C | -1.9°C | 90 mm | 82% | 1.3 m/s | 4.5 |
| 1983 | 14.1°C | 8.7°C | 3.2°C | 18.6°C | -1.5°C | 77 mm | 81% | 1.5 m/s | — |
| 1982 | 14.8°C | 8.7°C | 2.6°C | 21.5°C | -3.9°C | 71 mm | 69% | 1.4 m/s | — |
| 1981 | 16.4°C | 10.2°C | 3.9°C | 23.4°C | 0.2°C | 27 mm | 77% | 1.3 m/s | — |
Actual recorded September data for each year, 1981–2025 — sourced from NASA POWER.
The average high in September is around 15.1°C with lows near 3.6°C (mean 9.4°C), based on 45 years of NASA POWER data.
September averages 57 mm of rainfall in Canberra, about average for rainfall. The wettest on record was 110 mm in 1996.
The hottest September reached 28.7°C in 2017. The coldest dipped to -3.9°C in 1982.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average September temperatures have risen by about 1.8°C. Daytime highs moved from 14.2°C to 16.6°C and overnight lows from 3°C to 4.3°C over the same span.
September is one of the cooler months of the year in Canberra and about average for rainfall, so plan for around 15.1°C daytime highs and 3.6°C at night.
Not quite — September is the 4th coolest month in Canberra, averaging 9.4°C.
For September in Canberra, pack warm layers and a jacket for chilly mornings, with typical highs of 15.1°C and lows of 3.6°C. Bring an umbrella or light rain jacket too.
Relative humidity in September averages 75% — moderately humid.
Average wind speed in September is 1.3 m/s. The windiest September on record averaged 1.8 m/s (1996).
The wettest September on record was 1996 with 110 mm. On average, September sees 57 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 Canberra 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.
