September is one of the cooler months of the year in Brisbane, with average highs near 23.6°C and lows around 15°C (mean 19.3°C). It is one of the drier months, averaging 39 mm of rainfall and 68% relative humidity across the period.
September is one of the cooler months of the year in Brisbane. Across 45 years of records, the warmest September in Brisbane was 2017 — when the month averaged 21.2°C — while the coldest was 1990 at 17.3°C. Typical September days reach 23.6°C with nights near 15°C. The long-term trend is warming, about 0.4°C per decade.
September is one of the drier months in Brisbane, averaging 39 mm of rainfall. The wettest September on record was 1998 with 134 mm, while the driest was 2000 at 2 mm.
Relative humidity in Brisbane during September averages 68%. The most humid September was 1983 at 78%, and the least humid was 1991 at 54%.
September receives about 5.4 kWh/m²/day of solar energy in Brisbane. The sunniest Septembers were 2000, 2003 and 2019, among others at 5.9 kWh/m²/day, and the cloudiest was 2010 at 4.2.
Average wind speed in Brisbane during September is 3.3 m/s. The windiest Septembers were 2002, 2008 and 2021 at 3.7 m/s, while the calmest was 1987 at 2.8 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 18.5°C | 18.8°C | 19.8°C | 19.7°C | 20.0°C | +1.5°C |
| Avg High | 22.8°C | 23.1°C | 24.2°C | 24.0°C | 24.2°C | +1.4°C |
| Avg Low | 14.2°C | 14.5°C | 15.3°C | 15.3°C | 15.9°C | +1.7°C |
| Avg Rain | 41 mm | 48 mm | 38 mm | 37 mm | 27 mm | -14 mm |
September temperatures in Brisbane have risen by about 1.5°C between 1981–1985 and 2021–2025.
September has ranged from a record low of 7°C (1987) to a record high of 33.9°C (2017).
Rainfall in September is one of the drier months, averaging 39 mm, with a wettest year of 134 mm.
One of the best times to visit Brisbane
September is one of the best times to visit Brisbane. Expect days averaging 23.6°C and nights around 15°C (mean 19.3°C) — cooler than Brisbane's yearly average — with moderate rainfall (39 mm), so conditions are generally comfortable for sightseeing and outdoor plans.
| Year | Avg High | Avg Temp | Avg Low | Hottest Day | Coldest Day | Rainfall | Humidity | Wind | Solar |
|---|---|---|---|---|---|---|---|---|---|
| 2025 | 24.3°C | 20.1°C | 15.9°C | 27.8°C | 12.4°C | 6 mm | 70% | 3 m/s | 5.6 |
| 2024 | 25.3°C | 20.8°C | 16.4°C | 31.4°C | 13.0°C | 43 mm | 67% | 3.6 m/s | 5.5 |
| 2023 | 24.9°C | 20.7°C | 16.5°C | 32.1°C | 14.2°C | 22 mm | 65% | 3.4 m/s | 5.6 |
| 2022 | 22.8°C | 18.9°C | 15.1°C | 26.9°C | 11.5°C | 56 mm | 73% | 3.2 m/s | 4.5 |
| 2021 | 23.8°C | 19.3°C | 14.8°C | 28.4°C | 11.3°C | 17 mm | 65% | 3.7 m/s | 5.6 |
| 2020 | 23.9°C | 20.2°C | 16.5°C | 28.4°C | 11.9°C | 18 mm | 68% | 3.5 m/s | 5.4 |
| 2019 | 25.5°C | 20.5°C | 15.5°C | 30.2°C | 11.0°C | 11 mm | 61% | 3.3 m/s | 5.9 |
| 2018 | 23.4°C | 19.6°C | 15.7°C | 27.2°C | 13.4°C | 45 mm | 67% | 3.6 m/s | 5.1 |
| 2017 🔥 | 26.5°C | 21.2°C | 15.8°C | 33.9°C | 10.9°C | 4 mm | 58% | 3.4 m/s | 5.8 |
| 2016 | 23.7°C | 19.7°C | 15.7°C | 26.2°C | 11.8°C | 46 mm | 69% | 3.5 m/s | 5 |
| 2015 | 22.8°C | 18.5°C | 14.3°C | 26.7°C | 10.3°C | 58 mm | 69% | 3.4 m/s | 5.2 |
| 2014 | 22.9°C | 18.8°C | 14.7°C | 26.5°C | 9.9°C | 34 mm | 68% | 3.2 m/s | 5.6 |
| 2013 | 25.5°C | 20.9°C | 16.3°C | 30.3°C | 13.8°C | 30 mm | 68% | 3.2 m/s | 5.5 |
| 2012 | 23.6°C | 19.1°C | 14.6°C | 28.1°C | 9.7°C | 20 mm | 69% | 3 m/s | 5.4 |
| 2011 | 23.2°C | 18.6°C | 13.9°C | 29.5°C | 8.8°C | 19 mm | 66% | 3.3 m/s | 5.5 |
| 2010 | 23.0°C | 19.7°C | 16.4°C | 25.5°C | 12.6°C | 99 mm | 75% | 3 m/s | 4.2 |
| 2009 | 24.5°C | 19.9°C | 15.2°C | 29.0°C | 11.1°C | 50 mm | 67% | 3 m/s | 5.8 |
| 2008 | 23.1°C | 19.4°C | 15.7°C | 31.1°C | 11.7°C | 64 mm | 75% | 3.7 m/s | 5.2 |
| 2007 | 23.3°C | 19.1°C | 14.9°C | 28.9°C | 12.1°C | 68 mm | 73% | 3.3 m/s | 5.3 |
| 2006 | 22.3°C | 18.9°C | 15.5°C | 26.9°C | 11.2°C | 84 mm | 75% | 3.5 m/s | 5.2 |
| 2005 | 23.8°C | 19.5°C | 15.2°C | 28.5°C | 10.3°C | 28 mm | 68% | 3.5 m/s | 5.3 |
| 2004 | 24.0°C | 19.6°C | 15.1°C | 28.7°C | 11.9°C | 25 mm | 66% | 3.4 m/s | 5.5 |
| 2003 | 26.5°C | 21.0°C | 15.5°C | 31.3°C | 12.4°C | 11 mm | 58% | 3.4 m/s | 5.9 |
| 2002 | 25.0°C | 20.2°C | 15.4°C | 29.0°C | 11.0°C | 23 mm | 67% | 3.7 m/s | 5.7 |
| 2001 | 23.6°C | 19.5°C | 15.3°C | 26.4°C | 11.6°C | 20 mm | 67% | 3.3 m/s | 5.2 |
| 2000 | 25.7°C | 20.5°C | 15.4°C | 31.9°C | 11.7°C | 2 mm | 63% | 3.6 m/s | 5.9 |
| 1999 | 21.5°C | 18.4°C | 15.3°C | 24.2°C | 11.0°C | 63 mm | 77% | 3.1 m/s | 5.2 |
| 1998 🌧️ | 22.7°C | 19.7°C | 16.8°C | 26.4°C | 12.1°C | 134 mm | 76% | 3.2 m/s | 4.8 |
| 1997 | 23.8°C | 19.5°C | 15.2°C | 30.6°C | 11.5°C | 53 mm | 69% | 3.5 m/s | 4.9 |
| 1996 | 23.8°C | 18.4°C | 13.1°C | 28.7°C | 8.2°C | 47 mm | 67% | 3.5 m/s | 5.6 |
| 1995 | 23.9°C | 19.6°C | 15.3°C | 28.0°C | 7.9°C | 32 mm | 68% | 3.3 m/s | 5.2 |
| 1994 | 23.8°C | 18.6°C | 13.3°C | 29.1°C | 9.7°C | 21 mm | 60% | 3.4 m/s | 5.7 |
| 1993 | 22.0°C | 18.4°C | 14.7°C | 29.8°C | 10.5°C | 69 mm | 69% | 3.4 m/s | 4.8 |
| 1992 | 23.2°C | 18.4°C | 13.6°C | 28.8°C | 9.2°C | 40 mm | 65% | 3.2 m/s | 5.3 |
| 1991 | 25.3°C | 20.0°C | 14.6°C | 30.2°C | 9.3°C | 4 mm | 54% | 3.2 m/s | 5.9 |
| 1990 ❄️ | 21.2°C | 17.3°C | 13.5°C | 25.0°C | 9.7°C | 20 mm | 69% | 3.5 m/s | 5.1 |
| 1989 | 22.3°C | 17.5°C | 12.8°C | 27.2°C | 8.7°C | 12 mm | 69% | 3.5 m/s | 5.5 |
| 1988 | 22.3°C | 18.7°C | 15.1°C | 29.4°C | 10.4°C | 70 mm | 76% | 3.4 m/s | 5.3 |
| 1987 | 22.8°C | 18.4°C | 14.1°C | 26.8°C | 7.0°C | 4 mm | 67% | 2.8 m/s | 5.6 |
| 1986 | 23.8°C | 19.4°C | 15.0°C | 28.3°C | 10.4°C | 36 mm | 66% | 3.6 m/s | 5.5 |
| 1985 | 22.2°C | 17.8°C | 13.5°C | 26.9°C | 8.7°C | 64 mm | 70% | 3.2 m/s | 5.2 |
| 1984 | 22.4°C | 17.5°C | 12.6°C | 25.2°C | 8.8°C | 44 mm | 66% | 3.4 m/s | 5.5 |
| 1983 | 22.9°C | 19.2°C | 15.5°C | 27.8°C | 11.2°C | 47 mm | 78% | 3.2 m/s | — |
| 1982 | 22.6°C | 18.3°C | 13.9°C | 29.6°C | 9.4°C | 86 mm | 67% | 3.4 m/s | — |
| 1981 | 24.1°C | 19.8°C | 15.5°C | 31.7°C | 7.8°C | 7 mm | 66% | 2.9 m/s | — |
Actual recorded September data for each year, 1981–2025 — sourced from NASA POWER.
The average high in September is around 23.6°C with lows near 15°C (mean 19.3°C), based on 45 years of NASA POWER data.
September averages 39 mm of rainfall in Brisbane, one of the drier months. The wettest on record was 134 mm in 1998.
The hottest September reached 33.9°C in 2017. The coldest dipped to 7°C in 1987.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average September temperatures have risen by about 1.5°C. Daytime highs moved from 22.8°C to 24.2°C and overnight lows from 14.2°C to 15.7°C over the same span.
September is one of the cooler months of the year in Brisbane and one of the drier months, so plan for around 23.6°C daytime highs and 15°C at night.
Not quite — September is the 5th coolest month in Brisbane, averaging 19.3°C.
For September in Brisbane, pack light layers you can adjust through the day, with typical highs of 23.6°C and lows of 15°C.
Relative humidity in September averages 68% — moderately humid.
Average wind speed in September is 3.3 m/s. The windiest September on record averaged 3.7 m/s (2002).
The wettest September on record was 1998 with 134 mm. On average, September sees 39 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 Brisbane 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.
