August is one of the cooler months of the year in Mandurah, with average highs near 17.1°C and lows around 13°C (mean 15.1°C). It is a relatively wet time of year, averaging 118 mm of rainfall and 74% relative humidity across the period.
August is one of the cooler months of the year in Mandurah. Across 45 years of records, the warmest August in Mandurah was 2024 — when the month averaged 16.4°C — while the coldest was 1990 at 13.5°C. Typical August days reach 17.1°C with nights near 13°C. The long-term August temperature trend is broadly flat.
August is a relatively wet time of year in Mandurah, averaging 118 mm of rainfall. The wettest August on record was 1992 with 180 mm, while the driest was 2008 at 31 mm.
Relative humidity in Mandurah during August averages 74%. The most humid August was 2014 at 77%, and the least humid was 1989 at 71%.
August receives about 3.5 kWh/m²/day of solar energy in Mandurah. The sunniest August was 2008 at 4 kWh/m²/day, and the cloudiest was 1992 at 3.
Average wind speed in Mandurah during August is 5.3 m/s. The windiest Augusts were 1983, 1992 and 2024 at 6.2 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 | 14.9°C | 14.9°C | 14.9°C | 15.2°C | 15.3°C | +0.4°C |
| Avg High | 16.8°C | 16.9°C | 16.9°C | 17.4°C | 17.4°C | +0.6°C |
| Avg Low | 12.9°C | 12.9°C | 13.0°C | 13.1°C | 13.2°C | +0.3°C |
| Avg Rain | 107 mm | 135 mm | 137 mm | 113 mm | 86 mm | -21 mm |
August temperatures in Mandurah have stayed relatively stable across the record.
August has ranged from a record low of 7.3°C (1981) to a record high of 25°C (2023).
Rainfall in August is a relatively wet time of year, averaging 118 mm, with a wettest year of 180 mm.
A quieter season to visit Mandurah
If your dates are flexible, the more temperate months of March and December tend to be the most comfortable for visiting Mandurah. That said, August — with days averaging 17.1°C and nights around 13°C (mean 15.1°C) and higher rainfall (118 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 | 17.4°C | 15.0°C | 12.7°C | 20.8°C | 8.9°C | 117 mm | 75% | 5.4 m/s | 3.6 |
| 2024 🔥 | 17.7°C | 16.4°C | 15.0°C | 20.5°C | 12.0°C | 100 mm | 74% | 6.2 m/s | 3.4 |
| 2023 | 17.8°C | 15.3°C | 12.9°C | 25.0°C | 8.5°C | 45 mm | 76% | 3.9 m/s | 3.7 |
| 2022 | 16.8°C | 14.7°C | 12.6°C | 19.8°C | 9.5°C | 118 mm | 74% | 5.7 m/s | 3.6 |
| 2021 | 17.4°C | 15.3°C | 13.2°C | 20.6°C | 8.7°C | 57 mm | 74% | 5.3 m/s | 3.6 |
| 2020 | 17.2°C | 15.0°C | 12.8°C | 20.5°C | 10.4°C | 80 mm | 74% | 5.4 m/s | 3.6 |
| 2019 | 18.0°C | 15.2°C | 12.5°C | 23.1°C | 9.6°C | 95 mm | 74% | 5 m/s | 3.9 |
| 2018 | 16.6°C | 14.6°C | 12.5°C | 19.8°C | 9.2°C | 120 mm | 75% | 5.9 m/s | 3.5 |
| 2017 | 17.0°C | 15.1°C | 13.2°C | 20.9°C | 9.6°C | 130 mm | 77% | 5.7 m/s | 3.5 |
| 2016 | 16.2°C | 14.1°C | 12.0°C | 19.0°C | 9.0°C | 114 mm | 74% | 5.5 m/s | 3.4 |
| 2015 | 17.3°C | 15.0°C | 12.7°C | 22.1°C | 9.8°C | 80 mm | 76% | 5 m/s | 3.6 |
| 2014 | 18.6°C | 16.2°C | 13.8°C | 20.6°C | 9.1°C | 116 mm | 77% | 4.8 m/s | 3.5 |
| 2013 | 17.8°C | 16.3°C | 14.7°C | 20.0°C | 12.2°C | 160 mm | 76% | 5.2 m/s | 3.3 |
| 2012 | 17.5°C | 15.5°C | 13.5°C | 21.2°C | 9.8°C | 110 mm | 73% | 4.4 m/s | 3.5 |
| 2011 | 17.8°C | 15.8°C | 13.8°C | 20.7°C | 8.8°C | 121 mm | 73% | 5.1 m/s | 3.6 |
| 2010 | 17.1°C | 14.6°C | 12.1°C | 20.3°C | 8.2°C | 86 mm | 72% | 4.4 m/s | 3.8 |
| 2009 | 16.8°C | 15.3°C | 13.7°C | 19.0°C | 9.6°C | 146 mm | 76% | 5.1 m/s | 3.3 |
| 2008 | 17.0°C | 13.9°C | 10.8°C | 19.7°C | 8.4°C | 31 mm | 75% | 5 m/s | 4 |
| 2007 | 17.4°C | 15.6°C | 13.8°C | 19.9°C | 10.5°C | 135 mm | 75% | 5.5 m/s | 3.1 |
| 2006 | 17.9°C | 16.1°C | 14.2°C | 20.9°C | 11.8°C | 163 mm | 75% | 5.5 m/s | 3.3 |
| 2005 | 16.9°C | 15.0°C | 13.1°C | 20.8°C | 9.5°C | 139 mm | 74% | 5.1 m/s | 3.3 |
| 2004 | 16.3°C | 14.5°C | 12.8°C | 18.9°C | 7.7°C | 179 mm | 73% | 5.7 m/s | 3.5 |
| 2003 | 16.6°C | 14.7°C | 12.8°C | 18.8°C | 10.1°C | 140 mm | 73% | 5 m/s | 3.6 |
| 2002 | 16.6°C | 14.7°C | 12.8°C | 18.8°C | 9.1°C | 121 mm | 73% | 5.3 m/s | 3.6 |
| 2001 | 16.8°C | 15.0°C | 13.2°C | 20.5°C | 10.2°C | 138 mm | 73% | 4.7 m/s | 3.4 |
| 2000 | 16.2°C | 14.3°C | 12.4°C | 18.4°C | 9.2°C | 174 mm | 74% | 5.7 m/s | 3.4 |
| 1999 | 17.4°C | 15.2°C | 13.0°C | 19.6°C | 10.0°C | 166 mm | 74% | 5.8 m/s | 3.4 |
| 1998 | 18.0°C | 16.2°C | 14.3°C | 21.2°C | 11.1°C | 155 mm | 76% | 5.5 m/s | 3.3 |
| 1997 | 16.9°C | 14.8°C | 12.7°C | 19.7°C | 9.0°C | 145 mm | 75% | 5.1 m/s | 3.5 |
| 1996 | 16.9°C | 15.1°C | 13.3°C | 19.6°C | 9.8°C | 138 mm | 74% | 5.6 m/s | 3.4 |
| 1995 | 17.3°C | 15.4°C | 13.5°C | 19.9°C | 9.2°C | 92 mm | 75% | 5.7 m/s | 3.6 |
| 1994 | 17.7°C | 15.4°C | 13.2°C | 21.0°C | 9.2°C | 155 mm | 76% | 4.9 m/s | 3.7 |
| 1993 | 16.4°C | 14.5°C | 12.6°C | 19.0°C | 8.5°C | 126 mm | 75% | 5.5 m/s | 3.5 |
| 1992 🌧️ | 16.2°C | 14.4°C | 12.6°C | 20.2°C | 9.5°C | 180 mm | 77% | 6.2 m/s | 3 |
| 1991 | 17.0°C | 14.8°C | 12.6°C | 19.7°C | 9.5°C | 90 mm | 75% | 6 m/s | 3.5 |
| 1990 ❄️ | 15.5°C | 13.5°C | 11.6°C | 18.1°C | 8.1°C | 102 mm | 74% | 5.7 m/s | 3.6 |
| 1989 | 17.2°C | 15.0°C | 12.8°C | 21.3°C | 9.9°C | 104 mm | 71% | 4.8 m/s | 3.6 |
| 1988 | 16.9°C | 14.9°C | 13.0°C | 19.4°C | 9.8°C | 109 mm | 75% | 5.5 m/s | 3.5 |
| 1987 | 17.1°C | 14.4°C | 11.7°C | 20.4°C | 9.1°C | 73 mm | 75% | 4.7 m/s | 3.7 |
| 1986 | 15.5°C | 13.8°C | 12.1°C | 18.2°C | 8.4°C | 96 mm | 74% | 5 m/s | 3.6 |
| 1985 | 16.8°C | 14.9°C | 13.0°C | 20.6°C | 9.9°C | 117 mm | 74% | 5.9 m/s | 3.4 |
| 1984 | 16.6°C | 14.9°C | 13.3°C | 19.0°C | 9.3°C | 103 mm | 73% | 5.6 m/s | 3.3 |
| 1983 | 17.8°C | 16.1°C | 14.5°C | 20.7°C | 10.0°C | 114 mm | 74% | 6.2 m/s | — |
| 1982 | 17.4°C | 15.2°C | 12.9°C | 20.4°C | 9.7°C | 90 mm | 75% | 4.7 m/s | — |
| 1981 | 16.1°C | 14.6°C | 13.0°C | 18.3°C | 7.3°C | 157 mm | 73% | 6.1 m/s | — |
Actual recorded August data for each year, 1981–2025 — sourced from NASA POWER.
The average high in August is around 17.1°C with lows near 13°C (mean 15.1°C), based on 45 years of NASA POWER data.
August averages 118 mm of rainfall in Mandurah, a relatively wet time of year. The wettest on record was 180 mm in 1992.
The hottest August reached 25°C in 2023. The coldest dipped to 7.3°C in 1981.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average August temperatures have risen by about 0.2°C. Daytime highs moved from 16.9°C to 17.4°C and overnight lows from 13.3°C to 13.3°C over the same span.
August is one of the cooler months of the year in Mandurah and a relatively wet time of year, so plan for around 17.1°C daytime highs and 13°C at night.
Yes — August is the coldest month of the year in Mandurah, averaging 15.1°C.
For August in Mandurah, pack light layers you can adjust through the day, with typical highs of 17.1°C and lows of 13°C. Bring an umbrella or light rain jacket too.
Relative humidity in August averages 74% — moderately humid.
Average wind speed in August is 5.3 m/s. The windiest August on record averaged 6.2 m/s (1983).
The wettest August on record was 1992 with 180 mm. On average, August sees 118 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 Mandurah 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.
