September is one of the cooler months of the year in Southern Cross, with average highs near 22.4°C and lows around 7.3°C (mean 14.9°C). It is about average for rainfall, averaging 20 mm of rainfall and 59% relative humidity across the period.
September is one of the cooler months of the year in Southern Cross. Across 45 years of records, the warmest September in Southern Cross was 2023 — when the month averaged 18.8°C — while the coldest was 1992 at 11.7°C. Typical September days reach 22.4°C with nights near 7.3°C. The long-term trend is warming, about 0.2°C per decade.
September is about average for rainfall in Southern Cross, averaging 20 mm of rainfall. The wettest September on record was 2006 with 50 mm, while the driest was 2020 at 3 mm.
Relative humidity in Southern Cross during September averages 59%. The most humid September was 1992 at 76%, and the least humid was 1987 at 50%.
September receives about 5.4 kWh/m²/day of solar energy in Southern Cross. The sunniest September was 2019 at 5.9 kWh/m²/day, and the cloudiest was 1992 at 4.5.
Average wind speed in Southern Cross during September is 3.3 m/s. The windiest September was 1996 at 3.8 m/s, while the calmest were 1990, 1995 and 1997, among others at 2.9 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 15.1°C | 14.4°C | 14.5°C | 15.0°C | 15.9°C | +0.8°C |
| Avg High | 22.7°C | 21.7°C | 22.1°C | 22.6°C | 23.7°C | +1°C |
| Avg Low | 7.4°C | 7.1°C | 6.9°C | 7.4°C | 8.2°C | +0.8°C |
| Avg Rain | 17 mm | 24 mm | 25 mm | 20 mm | 11 mm | -6 mm |
September temperatures in Southern Cross have risen by about 0.8°C between 1981–1985 and 2021–2025.
September has ranged from a record low of -0.5°C (2005) to a record high of 36.4°C (2023).
Rainfall in September is about average for rainfall, averaging 20 mm, with a wettest year of 50 mm.
A quieter season to visit Southern Cross
If your dates are flexible, the more temperate months of November and March tend to be the most comfortable for visiting Southern Cross. That said, September — with days averaging 22.4°C and nights around 7.3°C (mean 14.9°C) and low rainfall (20 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 | 22.6°C | 14.9°C | 7.2°C | 31.4°C | 3.9°C | 14 mm | 59% | 3.2 m/s | 5.7 |
| 2024 | 24.1°C | 16.2°C | 8.2°C | 30.0°C | 2.5°C | 13 mm | 53% | 3.3 m/s | 5.7 |
| 2023 🔥 | 27.1°C | 18.8°C | 10.5°C | 36.4°C | 2.4°C | 7 mm | 52% | 3.6 m/s | 5.4 |
| 2022 | 21.7°C | 14.8°C | 7.8°C | 28.1°C | 4.6°C | 22 mm | 61% | 3.4 m/s | 5 |
| 2021 | 22.9°C | 14.8°C | 6.7°C | 29.3°C | 0.1°C | 5 mm | 52% | 3.3 m/s | 5.6 |
| 2020 | 23.8°C | 16.1°C | 8.5°C | 34.4°C | 5.0°C | 3 mm | 55% | 3.5 m/s | 5.5 |
| 2019 | 25.8°C | 17.4°C | 9.0°C | 34.1°C | 1.3°C | 5 mm | 51% | 3.1 m/s | 5.9 |
| 2018 | 22.8°C | 14.8°C | 6.8°C | 32.1°C | 1.0°C | 14 mm | 56% | 3 m/s | 5.8 |
| 2017 | 21.9°C | 15.0°C | 8.1°C | 32.6°C | 1.9°C | 36 mm | 60% | 3.2 m/s | 5.2 |
| 2016 | 19.8°C | 12.4°C | 5.0°C | 29.3°C | 0.4°C | 13 mm | 60% | 3.3 m/s | 5.7 |
| 2015 | 23.4°C | 15.1°C | 6.7°C | 31.4°C | 0.2°C | 5 mm | 55% | 3.1 m/s | 5.8 |
| 2014 | 24.7°C | 17.1°C | 9.5°C | 31.2°C | 4.5°C | 32 mm | 58% | 3.5 m/s | 5.3 |
| 2013 | 21.6°C | 15.0°C | 8.3°C | 27.4°C | 2.9°C | 41 mm | 65% | 3.6 m/s | 5.2 |
| 2012 | 23.0°C | 15.2°C | 7.5°C | 30.1°C | 1.8°C | 23 mm | 55% | 3.6 m/s | 5.6 |
| 2011 | 21.5°C | 14.2°C | 6.8°C | 26.7°C | 3.4°C | 24 mm | 62% | 3.1 m/s | 5.5 |
| 2010 | 21.6°C | 14.0°C | 6.4°C | 29.6°C | 2.1°C | 7 mm | 55% | 3.1 m/s | 5.6 |
| 2009 | 19.6°C | 12.5°C | 5.3°C | 24.6°C | 2.0°C | 26 mm | 65% | 3.6 m/s | 5.3 |
| 2008 | 21.8°C | 14.3°C | 6.8°C | 30.0°C | 0.6°C | 45 mm | 63% | 3.5 m/s | 5.1 |
| 2007 | 23.1°C | 15.3°C | 7.6°C | 30.7°C | 4.2°C | 16 mm | 58% | 3.4 m/s | 5.5 |
| 2006 🌧️ | 22.7°C | 15.3°C | 7.9°C | 33.4°C | 2.7°C | 50 mm | 60% | 3.5 m/s | 5.3 |
| 2005 | 20.8°C | 13.5°C | 6.2°C | 29.9°C | -0.5°C | 28 mm | 62% | 3.6 m/s | 5.4 |
| 2004 | 22.3°C | 14.5°C | 6.7°C | 29.6°C | 0.4°C | 14 mm | 55% | 3 m/s | 5.2 |
| 2003 | 21.1°C | 14.0°C | 6.9°C | 30.3°C | 4.2°C | 24 mm | 65% | 3.6 m/s | 4.9 |
| 2002 | 23.1°C | 14.9°C | 6.6°C | 32.5°C | 0.9°C | 14 mm | 54% | 3.5 m/s | 5.6 |
| 2001 | 22.4°C | 14.7°C | 7.1°C | 32.9°C | 1.1°C | 24 mm | 61% | 3.4 m/s | 4.9 |
| 2000 | 24.2°C | 16.2°C | 8.3°C | 31.8°C | 3.9°C | 5 mm | 58% | 3 m/s | 5.6 |
| 1999 | 22.0°C | 14.7°C | 7.3°C | 31.0°C | 0.9°C | 29 mm | 64% | 3.4 m/s | 5.2 |
| 1998 | 21.1°C | 13.7°C | 6.4°C | 27.5°C | 1.5°C | 26 mm | 64% | 3.5 m/s | 5.1 |
| 1997 | 21.8°C | 14.8°C | 7.7°C | 28.1°C | 3.1°C | 30 mm | 65% | 2.9 m/s | 5.1 |
| 1996 | 21.3°C | 14.2°C | 7.1°C | 28.5°C | 2.8°C | 42 mm | 65% | 3.8 m/s | 5.1 |
| 1995 | 22.8°C | 15.5°C | 8.1°C | 31.2°C | 3.3°C | 17 mm | 61% | 2.9 m/s | 5.2 |
| 1994 | 24.1°C | 15.9°C | 7.7°C | 30.6°C | 1.5°C | 13 mm | 53% | 3.5 m/s | 5.7 |
| 1993 | 20.9°C | 13.6°C | 6.3°C | 26.4°C | 0.4°C | 11 mm | 60% | 3.2 m/s | 5.3 |
| 1992 ❄️ | 17.3°C | 11.7°C | 6.1°C | 24.6°C | 1.3°C | 40 mm | 76% | 3.3 m/s | 4.5 |
| 1991 | 22.7°C | 15.0°C | 7.2°C | 33.2°C | 1.6°C | 21 mm | 61% | 3.1 m/s | 5.6 |
| 1990 | 22.8°C | 14.7°C | 6.7°C | 30.8°C | 0.5°C | 15 mm | 56% | 2.9 m/s | 5.5 |
| 1989 | 22.7°C | 14.9°C | 7.1°C | 30.9°C | 2.5°C | 7 mm | 59% | 3.4 m/s | 5.7 |
| 1988 | 22.1°C | 14.8°C | 7.4°C | 29.4°C | 3.1°C | 12 mm | 61% | 3.3 m/s | 5.3 |
| 1987 | 23.9°C | 15.9°C | 7.9°C | 33.7°C | 2.4°C | 8 mm | 50% | 3.1 m/s | 5.6 |
| 1986 | 21.7°C | 14.6°C | 7.4°C | 26.7°C | 1.7°C | 17 mm | 62% | 2.9 m/s | 5.2 |
| 1985 | 23.2°C | 15.4°C | 7.6°C | 30.3°C | 2.0°C | 21 mm | 54% | 3.3 m/s | 5.5 |
| 1984 | 19.7°C | 12.7°C | 5.7°C | 24.0°C | 2.2°C | 24 mm | 62% | 3.2 m/s | 5.5 |
| 1983 | 23.8°C | 16.3°C | 8.8°C | 33.9°C | 5.4°C | 35 mm | 60% | 3.5 m/s | — |
| 1982 | 22.7°C | 14.9°C | 7.1°C | 31.1°C | 2.0°C | 22 mm | 56% | 3.2 m/s | — |
| 1981 | 24.2°C | 16.0°C | 7.9°C | 32.4°C | 2.8°C | 7 mm | 57% | 3.2 m/s | — |
Actual recorded September data for each year, 1981–2025 — sourced from NASA POWER.
The average high in September is around 22.4°C with lows near 7.3°C (mean 14.9°C), based on 45 years of NASA POWER data.
September averages 20 mm of rainfall in Southern Cross, about average for rainfall. The wettest on record was 50 mm in 2006.
The hottest September reached 36.4°C in 2023. The coldest dipped to -0.5°C in 2005.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average September temperatures have risen by about 0.8°C. Daytime highs moved from 22.7°C to 23.7°C and overnight lows from 7.4°C to 8.1°C over the same span.
September is one of the cooler months of the year in Southern Cross and about average for rainfall, so plan for around 22.4°C daytime highs and 7.3°C at night.
Not quite — September is the 4th coolest month in Southern Cross, averaging 14.9°C.
For September in Southern Cross, pack warm layers and a jacket for chilly mornings, with typical highs of 22.4°C and lows of 7.3°C.
Relative humidity in September averages 59% — moderately humid.
Average wind speed in September is 3.3 m/s. The windiest September on record averaged 3.8 m/s (1996).
The wettest September on record was 2006 with 50 mm. On average, September sees 20 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 Southern Cross 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.
