August is one of the cooler months of the year in Kwinana, with average highs near 17.6°C and lows around 13.4°C (mean 15.5°C). It is a relatively wet time of year, averaging 105 mm of rainfall and 74% relative humidity across the period.
August is one of the cooler months of the year in Kwinana. Across 45 years of records, the warmest August in Kwinana was 2024 — when the month averaged 16.9°C — while the coldest was 1990 at 14.1°C. Typical August days reach 17.6°C with nights near 13.4°C. The long-term August temperature trend is broadly flat.
August is a relatively wet time of year in Kwinana, averaging 105 mm of rainfall. The wettest August on record was 2004 with 168 mm, while the driest was 2008 at 28 mm.
Relative humidity in Kwinana during August averages 74%. The most humid August was 2014 at 76%, and the least humid was 1989 at 70%.
August receives about 3.5 kWh/m²/day of solar energy in Kwinana. The sunniest August was 2008 at 4 kWh/m²/day, and the cloudiest was 1992 at 3.
Average wind speed in Kwinana during August is 5.1 m/s. The windiest August was 1992 at 6 m/s, while the calmest was 2023 at 3.9 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 15.3°C | 15.4°C | 15.3°C | 15.7°C | 15.8°C | +0.5°C |
| Avg High | 17.3°C | 17.4°C | 17.3°C | 17.9°C | 18.0°C | +0.7°C |
| Avg Low | 13.3°C | 13.4°C | 13.3°C | 13.5°C | 13.7°C | +0.4°C |
| Avg Rain | 97 mm | 122 mm | 124 mm | 98 mm | 73 mm | -24 mm |
August temperatures in Kwinana have risen by about 0.3°C between 1981–1985 and 2021–2025.
August has ranged from a record low of 7.8°C (1981) to a record high of 26.8°C (2023).
Rainfall in August is a relatively wet time of year, averaging 105 mm, with a wettest year of 168 mm.
A quieter season to visit Kwinana
If your dates are flexible, the more temperate months of December and March tend to be the most comfortable for visiting Kwinana. That said, August — with days averaging 17.6°C and nights around 13.4°C (mean 15.5°C) and higher rainfall (105 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 | 17.9°C | 15.5°C | 13.1°C | 21.5°C | 9.5°C | 112 mm | 74% | 5.2 m/s | 3.6 |
| 2024 🔥 | 18.3°C | 16.9°C | 15.4°C | 21.5°C | 12.1°C | 72 mm | 72% | 5.9 m/s | 3.4 |
| 2023 | 18.5°C | 15.9°C | 13.4°C | 26.8°C | 9.8°C | 35 mm | 75% | 3.9 m/s | 3.7 |
| 2022 | 17.4°C | 15.3°C | 13.1°C | 20.8°C | 10.0°C | 108 mm | 73% | 5.6 m/s | 3.6 |
| 2021 | 17.9°C | 15.8°C | 13.7°C | 21.1°C | 9.2°C | 47 mm | 73% | 5 m/s | 3.6 |
| 2020 | 17.8°C | 15.6°C | 13.3°C | 21.6°C | 10.7°C | 63 mm | 73% | 5.2 m/s | 3.6 |
| 2019 | 18.5°C | 15.7°C | 13.0°C | 24.1°C | 10.0°C | 89 mm | 73% | 4.9 m/s | 3.9 |
| 2018 | 17.1°C | 15.1°C | 13.0°C | 21.2°C | 9.9°C | 118 mm | 74% | 5.7 m/s | 3.5 |
| 2017 | 17.5°C | 15.6°C | 13.8°C | 21.5°C | 10.3°C | 133 mm | 76% | 5.4 m/s | 3.5 |
| 2016 | 16.6°C | 14.5°C | 12.4°C | 19.7°C | 9.6°C | 87 mm | 73% | 5.3 m/s | 3.4 |
| 2015 | 17.8°C | 15.4°C | 13.1°C | 22.4°C | 10.4°C | 68 mm | 75% | 4.9 m/s | 3.6 |
| 2014 | 19.3°C | 16.8°C | 14.4°C | 21.4°C | 9.8°C | 87 mm | 76% | 4.6 m/s | 3.5 |
| 2013 | 18.4°C | 16.7°C | 15.1°C | 21.0°C | 12.0°C | 138 mm | 75% | 5 m/s | 3.3 |
| 2012 | 18.1°C | 16.0°C | 13.8°C | 21.4°C | 10.0°C | 85 mm | 73% | 4.2 m/s | 3.5 |
| 2011 | 18.3°C | 16.2°C | 14.1°C | 21.3°C | 9.4°C | 99 mm | 72% | 4.9 m/s | 3.6 |
| 2010 | 17.7°C | 15.1°C | 12.6°C | 21.1°C | 8.7°C | 76 mm | 71% | 4.3 m/s | 3.8 |
| 2009 | 17.4°C | 15.7°C | 14.1°C | 19.8°C | 9.9°C | 129 mm | 76% | 4.9 m/s | 3.3 |
| 2008 | 17.5°C | 14.4°C | 11.3°C | 20.0°C | 8.8°C | 28 mm | 73% | 5 m/s | 4 |
| 2007 | 17.8°C | 16.0°C | 14.1°C | 20.7°C | 11.1°C | 115 mm | 74% | 5.2 m/s | 3.1 |
| 2006 | 18.5°C | 16.5°C | 14.6°C | 22.0°C | 11.1°C | 149 mm | 75% | 5.2 m/s | 3.3 |
| 2005 | 17.3°C | 15.4°C | 13.5°C | 21.1°C | 10.1°C | 131 mm | 73% | 5 m/s | 3.3 |
| 2004 🌧️ | 16.7°C | 14.9°C | 13.1°C | 19.6°C | 8.4°C | 168 mm | 73% | 5.5 m/s | 3.5 |
| 2003 | 17.0°C | 15.1°C | 13.2°C | 19.0°C | 10.6°C | 131 mm | 72% | 4.8 m/s | 3.6 |
| 2002 | 17.0°C | 15.1°C | 13.1°C | 19.9°C | 9.2°C | 99 mm | 72% | 5.1 m/s | 3.6 |
| 2001 | 17.2°C | 15.3°C | 13.5°C | 20.9°C | 10.6°C | 133 mm | 73% | 4.6 m/s | 3.4 |
| 2000 | 16.8°C | 14.8°C | 12.8°C | 19.5°C | 9.6°C | 157 mm | 74% | 5.4 m/s | 3.4 |
| 1999 | 17.8°C | 15.6°C | 13.4°C | 20.1°C | 10.5°C | 158 mm | 73% | 5.6 m/s | 3.4 |
| 1998 | 18.5°C | 16.6°C | 14.7°C | 22.1°C | 12.1°C | 139 mm | 76% | 5.2 m/s | 3.3 |
| 1997 | 17.3°C | 15.2°C | 13.0°C | 20.7°C | 9.8°C | 132 mm | 74% | 5 m/s | 3.5 |
| 1996 | 17.3°C | 15.5°C | 13.7°C | 20.8°C | 10.4°C | 118 mm | 73% | 5.3 m/s | 3.4 |
| 1995 | 17.8°C | 15.8°C | 13.8°C | 20.9°C | 9.6°C | 85 mm | 74% | 5.4 m/s | 3.6 |
| 1994 | 18.3°C | 16.0°C | 13.6°C | 21.4°C | 9.9°C | 133 mm | 75% | 4.9 m/s | 3.7 |
| 1993 | 16.9°C | 14.9°C | 12.9°C | 19.7°C | 9.2°C | 122 mm | 74% | 5.2 m/s | 3.5 |
| 1992 | 16.7°C | 15.0°C | 13.2°C | 21.0°C | 10.0°C | 167 mm | 76% | 6 m/s | 3 |
| 1991 | 17.4°C | 15.3°C | 13.1°C | 20.7°C | 10.3°C | 74 mm | 74% | 5.8 m/s | 3.5 |
| 1990 ❄️ | 16.0°C | 14.1°C | 12.3°C | 18.7°C | 8.9°C | 90 mm | 73% | 5.5 m/s | 3.6 |
| 1989 | 17.8°C | 15.5°C | 13.2°C | 22.2°C | 10.3°C | 91 mm | 70% | 4.7 m/s | 3.6 |
| 1988 | 17.4°C | 15.4°C | 13.5°C | 20.2°C | 10.5°C | 100 mm | 74% | 5.4 m/s | 3.5 |
| 1987 | 17.7°C | 14.9°C | 12.1°C | 21.2°C | 9.4°C | 69 mm | 74% | 4.7 m/s | 3.7 |
| 1986 | 15.9°C | 14.2°C | 12.5°C | 19.3°C | 9.4°C | 93 mm | 73% | 4.8 m/s | 3.6 |
| 1985 | 17.2°C | 15.4°C | 13.5°C | 21.4°C | 10.3°C | 96 mm | 73% | 5.7 m/s | 3.4 |
| 1984 | 17.0°C | 15.3°C | 13.7°C | 19.5°C | 10.0°C | 104 mm | 72% | 5.3 m/s | 3.3 |
| 1983 | 18.2°C | 16.4°C | 14.7°C | 21.0°C | 10.4°C | 88 mm | 74% | 5.9 m/s | — |
| 1982 | 17.9°C | 15.6°C | 13.4°C | 20.8°C | 10.5°C | 91 mm | 75% | 4.6 m/s | — |
| 1981 | 16.6°C | 15.1°C | 13.5°C | 18.9°C | 7.8°C | 144 mm | 72% | 5.8 m/s | — |
Actual recorded August data for each year, 1981–2025 — sourced from NASA POWER.
The average high in August is around 17.6°C with lows near 13.4°C (mean 15.5°C), based on 45 years of NASA POWER data.
August averages 105 mm of rainfall in Kwinana, a relatively wet time of year. The wettest on record was 168 mm in 2004.
The hottest August reached 26.8°C in 2023. The coldest dipped to 7.8°C in 1981.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average August temperatures have risen by about 0.3°C — but days and nights have moved in opposite directions. Daytime highs rose from 17.4°C to 18°C while overnight lows fell from 13.8°C to 13.7°C, widening the gap between day and night.
August is one of the cooler months of the year in Kwinana and a relatively wet time of year, so plan for around 17.6°C daytime highs and 13.4°C at night.
Yes — August is the coldest month of the year in Kwinana, averaging 15.5°C.
For August in Kwinana, pack light layers you can adjust through the day, with typical highs of 17.6°C and lows of 13.4°C. Bring an umbrella or light rain jacket too.
Relative humidity in August averages 74% — moderately humid.
Average wind speed in August is 5.1 m/s. The windiest August on record averaged 6 m/s (1992).
The wettest August on record was 2004 with 168 mm. On average, August sees 105 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 Kwinana 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.
