May is one of the cooler months of the year in Mandurah, with average highs near 20.6°C and lows around 15.7°C (mean 18.2°C). It is a relatively wet time of year, averaging 101 mm of rainfall and 69% relative humidity across the period.
May is one of the cooler months of the year in Mandurah. Across 45 years of records, the warmest May in Mandurah was 2024 — when the month averaged 20.1°C — while the coldest was 1987 at 16.8°C. Typical May days reach 20.6°C with nights near 15.7°C. The long-term May temperature trend is broadly flat.
May is a relatively wet time of year in Mandurah, averaging 101 mm of rainfall. The wettest May on record was 1981 with 220 mm, while the driest was 2019 at 18 mm.
Relative humidity in Mandurah during May averages 69%. The most humid May was 2005 at 77%, and the least humid was 1985 at 63%.
May receives about 3.1 kWh/m²/day of solar energy in Mandurah. The sunniest Mays were 2009, 2018 and 2019 at 3.4 kWh/m²/day, and the cloudiest was 1999 at 2.6.
Average wind speed in Mandurah during May is 5 m/s. The windiest Mays were 1981 and 1988 at 6 m/s, while the calmest was 2008 at 4.1 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 18.0°C | 18.3°C | 18.3°C | 17.9°C | 18.5°C | +0.5°C |
| Avg High | 20.3°C | 20.6°C | 20.7°C | 20.4°C | 21.2°C | +0.9°C |
| Avg Low | 15.7°C | 15.9°C | 15.9°C | 15.4°C | 15.9°C | +0.2°C |
| Avg Rain | 122 mm | 115 mm | 102 mm | 88 mm | 68 mm | -54 mm |
May temperatures in Mandurah have risen by about 0.6°C between 1981–1985 and 2021–2025.
May has ranged from a record low of 10.2°C (1995) to a record high of 27.7°C (2003).
Rainfall in May is a relatively wet time of year, averaging 101 mm, with a wettest year of 220 mm.
Daytime highs and overnight lows have shifted differently — highs rose about 0.2°C per decade while lows rose 0°C per decade, widening the gap between day and night.
A good time to visit Mandurah
May is a good time to visit Mandurah, with days averaging 20.6°C and nights around 15.7°C (mean 18.2°C, close to Mandurah's yearly average) and higher rainfall. March and December are marginally more temperate, but May still suits most travellers.
| Year | Avg High | Avg Temp | Avg Low | Hottest Day | Coldest Day | Rainfall | Humidity | Wind | Solar |
|---|---|---|---|---|---|---|---|---|---|
| 2025 | 22.3°C | 19.2°C | 16.1°C | 26.0°C | 12.2°C | 39 mm | 68% | 5 m/s | 3.3 |
| 2024 🔥 | 22.9°C | 20.1°C | 17.4°C | 26.6°C | 14.8°C | 74 mm | 67% | 4.9 m/s | 3 |
| 2023 | 20.8°C | 17.8°C | 14.9°C | 24.5°C | 12.0°C | 44 mm | 68% | 5.1 m/s | 3.1 |
| 2022 | 20.5°C | 18.0°C | 15.6°C | 24.0°C | 12.6°C | 85 mm | 71% | 4.8 m/s | 3.1 |
| 2021 | 20.8°C | 18.5°C | 16.3°C | 24.6°C | 13.4°C | 53 mm | 71% | 5 m/s | 2.8 |
| 2020 | 20.1°C | 17.6°C | 15.1°C | 23.7°C | 12.2°C | 109 mm | 69% | 5.7 m/s | 3.1 |
| 2019 | 20.3°C | 17.3°C | 14.4°C | 23.5°C | 11.3°C | 18 mm | 66% | 4.6 m/s | 3.4 |
| 2018 | 21.8°C | 18.7°C | 15.6°C | 26.1°C | 13.1°C | 53 mm | 65% | 5.3 m/s | 3.4 |
| 2017 | 20.6°C | 18.3°C | 15.9°C | 25.0°C | 12.8°C | 44 mm | 70% | 4.6 m/s | 3.2 |
| 2016 | 19.2°C | 17.3°C | 15.4°C | 21.7°C | 12.9°C | 71 mm | 71% | 4.7 m/s | 3 |
| 2015 | 19.6°C | 17.1°C | 14.5°C | 23.2°C | 11.3°C | 76 mm | 70% | 5 m/s | 3.3 |
| 2014 | 19.9°C | 18.3°C | 16.7°C | 22.4°C | 12.0°C | 158 mm | 74% | 5 m/s | 2.7 |
| 2013 | 19.9°C | 17.7°C | 15.4°C | 23.2°C | 10.9°C | 204 mm | 72% | 4.9 m/s | 3.1 |
| 2012 | 20.9°C | 18.3°C | 15.8°C | 24.6°C | 12.4°C | 81 mm | 70% | 4.4 m/s | 3.2 |
| 2011 | 21.8°C | 18.8°C | 15.9°C | 25.0°C | 13.5°C | 86 mm | 68% | 5 m/s | 3.3 |
| 2010 | 20.0°C | 17.3°C | 14.7°C | 25.4°C | 12.3°C | 84 mm | 68% | 4.6 m/s | 3.1 |
| 2009 | 21.9°C | 18.6°C | 15.2°C | 26.0°C | 11.6°C | 74 mm | 65% | 5 m/s | 3.4 |
| 2008 | 20.5°C | 18.6°C | 16.7°C | 24.4°C | 14.5°C | 143 mm | 74% | 4.1 m/s | 2.8 |
| 2007 | 19.2°C | 17.4°C | 15.6°C | 24.6°C | 12.1°C | 59 mm | 70% | 4.7 m/s | 2.8 |
| 2006 | 20.6°C | 17.5°C | 14.4°C | 25.5°C | 10.8°C | 42 mm | 69% | 5 m/s | 3.3 |
| 2005 | 21.7°C | 19.3°C | 16.9°C | 25.9°C | 12.5°C | 194 mm | 77% | 5.6 m/s | 2.9 |
| 2004 | 19.9°C | 17.7°C | 15.4°C | 24.9°C | 11.9°C | 124 mm | 68% | 5.4 m/s | 3.1 |
| 2003 | 21.7°C | 19.1°C | 16.5°C | 27.7°C | 13.5°C | 109 mm | 69% | 5.4 m/s | 3.1 |
| 2002 | 20.6°C | 18.3°C | 16.1°C | 26.0°C | 12.6°C | 78 mm | 71% | 5 m/s | 3.2 |
| 2001 | 20.3°C | 18.2°C | 16.1°C | 23.6°C | 11.5°C | 132 mm | 72% | 4.7 m/s | 2.9 |
| 2000 | 20.8°C | 18.2°C | 15.7°C | 23.9°C | 12.1°C | 61 mm | 65% | 4.7 m/s | 3.2 |
| 1999 | 21.5°C | 19.7°C | 17.8°C | 25.3°C | 12.8°C | 164 mm | 71% | 5.4 m/s | 2.6 |
| 1998 | 21.9°C | 19.2°C | 16.5°C | 26.1°C | 12.7°C | 85 mm | 68% | 4.8 m/s | 3 |
| 1997 | 20.3°C | 18.0°C | 15.7°C | 24.7°C | 12.0°C | 115 mm | 71% | 5.7 m/s | 3 |
| 1996 | 21.6°C | 18.9°C | 16.2°C | 25.0°C | 12.0°C | 65 mm | 65% | 4.9 m/s | 3.2 |
| 1995 | 19.9°C | 17.4°C | 14.8°C | 24.9°C | 10.2°C | 165 mm | 67% | 5.5 m/s | 3.3 |
| 1994 | 21.2°C | 18.8°C | 16.5°C | 26.6°C | 13.4°C | 136 mm | 70% | 5.3 m/s | 3.1 |
| 1993 | 19.9°C | 17.4°C | 14.9°C | 22.9°C | 12.4°C | 96 mm | 71% | 4.9 m/s | 3 |
| 1992 | 19.4°C | 17.4°C | 15.5°C | 21.6°C | 12.7°C | 122 mm | 71% | 5.4 m/s | 3 |
| 1991 | 20.5°C | 18.3°C | 16.1°C | 25.3°C | 13.6°C | 121 mm | 69% | 5.3 m/s | 2.8 |
| 1990 | 19.7°C | 17.5°C | 15.2°C | 22.2°C | 11.9°C | 78 mm | 73% | 4.5 m/s | 3 |
| 1989 | 21.3°C | 18.7°C | 16.0°C | 26.1°C | 12.7°C | 148 mm | 70% | 5.1 m/s | 3 |
| 1988 | 20.3°C | 18.4°C | 16.5°C | 24.3°C | 13.1°C | 169 mm | 73% | 6 m/s | 2.8 |
| 1987 ❄️ | 19.3°C | 16.8°C | 14.4°C | 23.4°C | 11.8°C | 69 mm | 69% | 4.6 m/s | 2.9 |
| 1986 | 19.7°C | 17.5°C | 15.4°C | 23.2°C | 11.7°C | 148 mm | 72% | 5.1 m/s | 2.8 |
| 1985 | 20.7°C | 17.7°C | 14.6°C | 24.9°C | 12.2°C | 74 mm | 63% | 4.9 m/s | 3.1 |
| 1984 | 19.9°C | 18.1°C | 16.3°C | 22.5°C | 13.2°C | 172 mm | 72% | 5.9 m/s | 2.7 |
| 1983 | 21.1°C | 18.9°C | 16.7°C | 25.1°C | 13.9°C | 36 mm | 67% | 4.4 m/s | — |
| 1982 | 19.6°C | 17.6°C | 15.6°C | 22.5°C | 11.7°C | 61 mm | 69% | 4.5 m/s | — |
| 1981 🌧️ | 20.7°C | 18.1°C | 15.5°C | 25.1°C | 12.2°C | 220 mm | 66% | 6 m/s | — |
Actual recorded May data for each year, 1981–2025 — sourced from NASA POWER.
The average high in May is around 20.6°C with lows near 15.7°C (mean 18.2°C), based on 45 years of NASA POWER data.
May averages 101 mm of rainfall in Mandurah, a relatively wet time of year. The wettest on record was 220 mm in 1981.
The hottest May reached 27.7°C in 2003. The coldest dipped to 10.2°C in 1995.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average May temperatures have risen by about 0.6°C. Daytime highs moved from 20.4°C to 21.5°C and overnight lows from 15.7°C to 16.1°C over the same span.
May is one of the cooler months of the year in Mandurah and a relatively wet time of year, so plan for around 20.6°C daytime highs and 15.7°C at night.
Not quite — May is the 6th coolest month in Mandurah, averaging 18.2°C.
For May in Mandurah, pack light layers you can adjust through the day, with typical highs of 20.6°C and lows of 15.7°C. Bring an umbrella or light rain jacket too.
Relative humidity in May averages 69% — moderately humid.
Average wind speed in May is 5 m/s. The windiest May on record averaged 6 m/s (1981).
The wettest May on record was 1981 with 220 mm. On average, May sees 101 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 May, 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 May specifically, along with year-by-year records and how the month has changed over the decades.
