August is one of the cooler months of the year in Southern Cross, with average highs near 18.8°C and lows around 5.5°C (mean 12.2°C). It is about average for rainfall, averaging 35 mm of rainfall and 67% relative humidity across the period.
August is one of the cooler months of the year in Southern Cross. Across 45 years of records, the warmest August in Southern Cross was 2023 — when the month averaged 15.1°C — while the coldest was 1986 at 9.9°C. Typical August days reach 18.8°C with nights near 5.5°C. The long-term trend is warming, about 0.3°C per decade.
August is about average for rainfall in Southern Cross, averaging 35 mm of rainfall. The wettest August on record was 1992 with 123 mm, while the driest was 2021 at 11 mm.
Relative humidity in Southern Cross during August averages 67%. The most humid August was 1992 at 77%, and the least humid was 2002 at 58%.
August receives about 4 kWh/m²/day of solar energy in Southern Cross. The sunniest August was 1989 at 4.4 kWh/m²/day, and the cloudiest was 1992 at 3.5.
Average wind speed in Southern Cross during August is 3.1 m/s. The windiest August was 1992 at 3.6 m/s, while the calmest were 1989, 2010 and 2023 at 2.6 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 11.8°C | 11.7°C | 12.0°C | 12.5°C | 13.1°C | +1.3°C |
| Avg High | 18.3°C | 18.1°C | 18.8°C | 19.2°C | 19.8°C | +1.5°C |
| Avg Low | 5.2°C | 5.3°C | 5.2°C | 5.9°C | 6.3°C | +1.1°C |
| Avg Rain | 30 mm | 42 mm | 33 mm | 37 mm | 29 mm | -1 mm |
August temperatures in Southern Cross have risen by about 0.7°C between 1981–1985 and 2021–2025.
August has ranged from a record low of -0.7°C (1992) to a record high of 31.1°C (2020).
Rainfall in August is about average for rainfall, averaging 35 mm, with a wettest year of 123 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, August — with days averaging 18.8°C and nights around 5.5°C (mean 12.2°C) and moderate rainfall (35 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 | 19.1°C | 12.3°C | 5.6°C | 29.0°C | 1.6°C | 47 mm | 63% | 3.2 m/s | 3.9 |
| 2024 | 20.4°C | 13.8°C | 7.2°C | 26.1°C | 1.6°C | 18 mm | 67% | 3.5 m/s | 3.9 |
| 2023 🔥 | 22.9°C | 15.1°C | 7.3°C | 31.1°C | 2.0°C | 24 mm | 60% | 2.6 m/s | 4.1 |
| 2022 | 18.3°C | 11.8°C | 5.3°C | 25.0°C | 1.9°C | 51 mm | 65% | 3.4 m/s | 4 |
| 2021 | 19.3°C | 12.6°C | 5.8°C | 27.5°C | 2.3°C | 11 mm | 64% | 3.1 m/s | 4.1 |
| 2020 | 19.1°C | 12.8°C | 6.6°C | 31.1°C | 3.9°C | 25 mm | 64% | 3.4 m/s | 3.9 |
| 2019 | 19.6°C | 12.5°C | 5.4°C | 27.3°C | 1.2°C | 40 mm | 62% | 3.1 m/s | 4.2 |
| 2018 | 17.6°C | 11.3°C | 5.0°C | 27.7°C | 1.3°C | 51 mm | 68% | 3.4 m/s | 3.9 |
| 2017 | 18.4°C | 12.2°C | 6.0°C | 22.6°C | 0.8°C | 41 mm | 69% | 3.4 m/s | 3.9 |
| 2016 | 16.9°C | 10.9°C | 4.9°C | 24.4°C | -0.3°C | 43 mm | 70% | 3.1 m/s | 3.7 |
| 2015 | 18.2°C | 12.0°C | 5.9°C | 26.8°C | 1.2°C | 37 mm | 71% | 2.9 m/s | 3.8 |
| 2014 | 21.8°C | 14.6°C | 7.4°C | 28.6°C | 1.6°C | 13 mm | 59% | 2.8 m/s | 4 |
| 2013 | 20.3°C | 13.7°C | 7.1°C | 25.7°C | 3.6°C | 42 mm | 69% | 2.9 m/s | 3.7 |
| 2012 | 20.4°C | 13.1°C | 5.8°C | 27.9°C | 2.0°C | 19 mm | 62% | 2.8 m/s | 4.1 |
| 2011 | 19.9°C | 13.0°C | 6.1°C | 27.7°C | 1.9°C | 50 mm | 68% | 2.9 m/s | 4.1 |
| 2010 | 18.8°C | 11.8°C | 4.9°C | 24.4°C | 0.9°C | 35 mm | 61% | 2.6 m/s | 4.2 |
| 2009 | 19.6°C | 13.1°C | 6.7°C | 25.0°C | 3.3°C | 46 mm | 72% | 2.9 m/s | 3.7 |
| 2008 | 17.4°C | 10.6°C | 3.8°C | 22.6°C | 1.3°C | 22 mm | 63% | 2.7 m/s | 4.3 |
| 2007 | 20.3°C | 13.0°C | 5.8°C | 27.2°C | 2.3°C | 19 mm | 63% | 3.1 m/s | 4.2 |
| 2006 | 22.5°C | 14.8°C | 7.2°C | 29.9°C | 1.5°C | 17 mm | 58% | 3.2 m/s | 4.3 |
| 2005 | 18.0°C | 11.4°C | 4.8°C | 25.6°C | 0.0°C | 48 mm | 67% | 3.2 m/s | 3.8 |
| 2004 | 16.8°C | 10.6°C | 4.4°C | 22.0°C | 0.9°C | 30 mm | 72% | 3.2 m/s | 3.9 |
| 2003 | 17.4°C | 11.5°C | 5.5°C | 24.1°C | 2.1°C | 63 mm | 71% | 3 m/s | 3.7 |
| 2002 | 19.6°C | 12.1°C | 4.5°C | 26.0°C | 0.9°C | 20 mm | 58% | 3 m/s | 4.1 |
| 2001 | 19.3°C | 11.8°C | 4.4°C | 26.4°C | 1.4°C | 18 mm | 62% | 2.7 m/s | 4.3 |
| 2000 | 17.1°C | 10.7°C | 4.4°C | 22.3°C | 0.9°C | 43 mm | 69% | 2.9 m/s | 3.9 |
| 1999 | 18.2°C | 11.5°C | 4.9°C | 24.9°C | 1.0°C | 26 mm | 72% | 3 m/s | 4.1 |
| 1998 | 20.0°C | 13.6°C | 7.1°C | 27.5°C | 1.8°C | 31 mm | 72% | 3 m/s | 3.6 |
| 1997 | 18.1°C | 11.5°C | 4.9°C | 23.1°C | -0.7°C | 39 mm | 67% | 2.7 m/s | 4 |
| 1996 | 17.0°C | 10.9°C | 4.7°C | 26.9°C | 0.1°C | 43 mm | 74% | 2.9 m/s | 3.7 |
| 1995 | 19.2°C | 12.3°C | 5.4°C | 28.8°C | 1.8°C | 12 mm | 68% | 2.9 m/s | 4.3 |
| 1994 | 20.5°C | 13.5°C | 6.5°C | 28.5°C | 3.1°C | 47 mm | 60% | 3.1 m/s | 4 |
| 1993 | 17.9°C | 11.3°C | 4.7°C | 25.0°C | 0.1°C | 49 mm | 70% | 3 m/s | 3.9 |
| 1992 🌧️ | 15.8°C | 10.5°C | 5.2°C | 20.5°C | -0.7°C | 123 mm | 77% | 3.6 m/s | 3.5 |
| 1991 | 18.4°C | 11.7°C | 5.1°C | 24.2°C | 1.8°C | 19 mm | 67% | 3.2 m/s | 4.1 |
| 1990 | 16.2°C | 10.2°C | 4.3°C | 21.2°C | 0.4°C | 36 mm | 71% | 3.4 m/s | 3.7 |
| 1989 | 17.3°C | 10.5°C | 3.6°C | 21.6°C | 0.4°C | 12 mm | 65% | 2.6 m/s | 4.4 |
| 1988 | 18.1°C | 11.7°C | 5.3°C | 25.8°C | 2.0°C | 40 mm | 70% | 3.1 m/s | 3.8 |
| 1987 | 19.2°C | 12.0°C | 4.7°C | 26.1°C | 0.5°C | 29 mm | 59% | 2.8 m/s | 4 |
| 1986 ❄️ | 16.2°C | 9.9°C | 3.7°C | 22.3°C | 0.8°C | 36 mm | 73% | 2.8 m/s | 4.1 |
| 1985 | 17.9°C | 11.6°C | 5.3°C | 22.1°C | 1.6°C | 32 mm | 69% | 3.2 m/s | 3.7 |
| 1984 | 17.2°C | 11.3°C | 5.3°C | 25.4°C | 2.0°C | 19 mm | 73% | 3.4 m/s | 3.9 |
| 1983 | 20.5°C | 13.8°C | 7.0°C | 27.1°C | 1.0°C | 36 mm | 63% | 3.3 m/s | — |
| 1982 | 21.2°C | 14.2°C | 7.2°C | 28.3°C | 1.1°C | 42 mm | 64% | 3 m/s | — |
| 1981 | 16.9°C | 10.9°C | 4.8°C | 20.4°C | 1.1°C | 26 mm | 73% | 3.3 m/s | — |
Actual recorded August data for each year, 1981–2025 — sourced from NASA POWER.
The average high in August is around 18.8°C with lows near 5.5°C (mean 12.2°C), based on 45 years of NASA POWER data.
August averages 35 mm of rainfall in Southern Cross, about average for rainfall. The wettest on record was 123 mm in 1992.
The hottest August reached 31.1°C in 2020. The coldest dipped to -0.7°C in 1992.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average August temperatures have risen by about 0.7°C. Daytime highs moved from 18.7°C to 20°C and overnight lows from 5.9°C to 6.2°C over the same span.
August is one of the cooler months of the year in Southern Cross and about average for rainfall, so plan for around 18.8°C daytime highs and 5.5°C at night.
Not quite — August is the 3rd coolest month in Southern Cross, averaging 12.2°C.
For August in Southern Cross, pack warm layers and a jacket for chilly mornings, with typical highs of 18.8°C and lows of 5.5°C.
Relative humidity in August averages 67% — moderately humid.
Average wind speed in August is 3.1 m/s. The windiest August on record averaged 3.6 m/s (1992).
The wettest August on record was 1992 with 123 mm. On average, August sees 35 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 August, 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 August specifically, along with year-by-year records and how the month has changed over the decades.
