May is one of the cooler months of the year in Yanchep, with average highs near 22.2°C and lows around 14.5°C (mean 18.4°C). It is a relatively wet time of year, averaging 76 mm of rainfall and 67% relative humidity across the period.
May is one of the cooler months of the year in Yanchep. Across 45 years of records, the warmest May in Yanchep was 2024 — when the month averaged 20.6°C — while the coldest was 1987 at 16.5°C. Typical May days reach 22.2°C with nights near 14.5°C. The long-term trend is warming, about 0.2°C per decade.
May is a relatively wet time of year in Yanchep, averaging 76 mm of rainfall. The wettest May on record was 1981 with 161 mm, while the driest was 2019 at 13 mm.
Relative humidity in Yanchep during May averages 67%. The most humid May was 2005 at 74%, and the least humid was 2018 at 58%.
May receives about 3.3 kWh/m²/day of solar energy in Yanchep. The sunniest May was 2019 at 3.7 kWh/m²/day, and the cloudiest was 1999 at 2.8.
Average wind speed in Yanchep during May is 4 m/s. The windiest May was 1981 at 4.9 m/s, while the calmest was 2008 at 3.2 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 18.1°C | 18.3°C | 18.4°C | 18.1°C | 19.0°C | +0.9°C |
| Avg High | 21.7°C | 22.0°C | 22.3°C | 22.1°C | 23.1°C | +1.4°C |
| Avg Low | 14.4°C | 14.6°C | 14.6°C | 14.1°C | 14.8°C | +0.4°C |
| Avg Rain | 99 mm | 90 mm | 76 mm | 59 mm | 49 mm | -50 mm |
May temperatures in Yanchep have risen by about 1°C between 1981–1985 and 2021–2025.
May has ranged from a record low of 8.2°C (2006) to a record high of 31.1°C (2002).
Rainfall in May is a relatively wet time of year, averaging 76 mm, with a wettest year of 161 mm.
Daytime highs and overnight lows have shifted differently — highs rose about 0.3°C per decade while lows rose 0°C per decade, widening the gap between day and night.
A good time to visit Yanchep
May is a good time to visit Yanchep, with days averaging 22.2°C and nights around 14.5°C (mean 18.4°C, cooler than Yanchep's yearly average) and moderate rainfall. December and April 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 | 24.4°C | 19.8°C | 15.1°C | 31.1°C | 9.3°C | 38 mm | 64% | 4 m/s | 3.6 |
| 2024 🔥 | 24.6°C | 20.6°C | 16.5°C | 27.6°C | 13.3°C | 37 mm | 61% | 3.8 m/s | 3.2 |
| 2023 | 23.0°C | 18.4°C | 13.8°C | 27.7°C | 9.3°C | 20 mm | 62% | 4.2 m/s | 3.3 |
| 2022 | 22.2°C | 18.2°C | 14.3°C | 25.6°C | 10.8°C | 61 mm | 68% | 3.9 m/s | 3.4 |
| 2021 | 22.5°C | 18.9°C | 15.3°C | 27.5°C | 10.3°C | 66 mm | 67% | 4 m/s | 3.1 |
| 2020 | 21.8°C | 17.8°C | 13.8°C | 27.1°C | 10.8°C | 70 mm | 65% | 4.6 m/s | 3.3 |
| 2019 | 22.1°C | 17.4°C | 12.7°C | 26.8°C | 9.2°C | 13 mm | 62% | 3.7 m/s | 3.7 |
| 2018 | 23.7°C | 19.1°C | 14.5°C | 30.1°C | 10.1°C | 45 mm | 58% | 4.3 m/s | 3.6 |
| 2017 | 22.4°C | 18.5°C | 14.5°C | 28.8°C | 9.8°C | 35 mm | 67% | 3.7 m/s | 3.5 |
| 2016 | 20.4°C | 17.2°C | 14.0°C | 24.4°C | 10.3°C | 68 mm | 71% | 3.5 m/s | 3.3 |
| 2015 | 21.5°C | 17.3°C | 13.1°C | 25.5°C | 9.6°C | 46 mm | 67% | 4.2 m/s | 3.6 |
| 2014 | 21.2°C | 18.4°C | 15.7°C | 24.1°C | 10.7°C | 107 mm | 74% | 3.8 m/s | 2.9 |
| 2013 | 21.4°C | 17.8°C | 14.3°C | 26.0°C | 10.2°C | 97 mm | 69% | 3.9 m/s | 3.3 |
| 2012 | 23.0°C | 18.7°C | 14.3°C | 27.3°C | 8.9°C | 35 mm | 66% | 3.7 m/s | 3.5 |
| 2011 | 23.4°C | 18.9°C | 14.4°C | 28.2°C | 11.7°C | 63 mm | 66% | 4.1 m/s | 3.5 |
| 2010 | 21.7°C | 17.5°C | 13.3°C | 29.0°C | 10.0°C | 77 mm | 65% | 3.7 m/s | 3.4 |
| 2009 | 23.7°C | 18.8°C | 14.0°C | 27.6°C | 10.4°C | 47 mm | 60% | 4.1 m/s | 3.6 |
| 2008 | 22.2°C | 18.8°C | 15.5°C | 26.8°C | 12.0°C | 80 mm | 72% | 3.2 m/s | 3.2 |
| 2007 | 20.5°C | 17.3°C | 14.2°C | 27.4°C | 9.9°C | 48 mm | 69% | 3.6 m/s | 3.2 |
| 2006 | 22.4°C | 17.8°C | 13.3°C | 27.6°C | 8.2°C | 34 mm | 66% | 4.1 m/s | 3.4 |
| 2005 | 23.3°C | 19.5°C | 15.7°C | 28.6°C | 12.1°C | 143 mm | 74% | 4.3 m/s | 3 |
| 2004 | 21.2°C | 17.6°C | 14.0°C | 27.4°C | 9.7°C | 118 mm | 66% | 4.3 m/s | 3.2 |
| 2003 | 23.4°C | 19.5°C | 15.6°C | 30.4°C | 11.2°C | 84 mm | 65% | 4.3 m/s | 3.3 |
| 2002 | 22.6°C | 18.8°C | 15.0°C | 31.1°C | 10.2°C | 51 mm | 68% | 4 m/s | 3.3 |
| 2001 | 21.7°C | 18.2°C | 14.8°C | 26.2°C | 11.4°C | 115 mm | 71% | 3.7 m/s | 3 |
| 2000 | 22.2°C | 17.9°C | 13.5°C | 26.4°C | 10.8°C | 43 mm | 63% | 3.9 m/s | 3.6 |
| 1999 | 22.6°C | 19.5°C | 16.4°C | 27.1°C | 10.1°C | 142 mm | 70% | 4.1 m/s | 2.8 |
| 1998 | 23.9°C | 19.8°C | 15.7°C | 29.5°C | 10.7°C | 70 mm | 66% | 3.8 m/s | 3.1 |
| 1997 | 21.5°C | 18.1°C | 14.7°C | 28.0°C | 9.3°C | 74 mm | 69% | 4.5 m/s | 3.1 |
| 1996 | 23.6°C | 19.2°C | 14.8°C | 28.4°C | 9.7°C | 51 mm | 61% | 4.1 m/s | 3.3 |
| 1995 | 21.0°C | 17.1°C | 13.3°C | 27.6°C | 9.0°C | 128 mm | 67% | 4.4 m/s | 3.5 |
| 1994 | 23.0°C | 19.2°C | 15.5°C | 30.0°C | 12.6°C | 109 mm | 68% | 4.1 m/s | 3.4 |
| 1993 | 21.3°C | 17.4°C | 13.4°C | 25.5°C | 9.4°C | 130 mm | 69% | 3.9 m/s | 3.2 |
| 1992 | 20.6°C | 17.2°C | 13.8°C | 22.5°C | 9.0°C | 56 mm | 69% | 4.2 m/s | 3.4 |
| 1991 | 21.7°C | 18.2°C | 14.6°C | 27.3°C | 10.3°C | 80 mm | 68% | 4.2 m/s | 3 |
| 1990 | 21.2°C | 17.5°C | 13.9°C | 26.7°C | 9.0°C | 63 mm | 70% | 3.6 m/s | 3.2 |
| 1989 | 22.7°C | 18.8°C | 14.9°C | 28.2°C | 11.5°C | 112 mm | 67% | 4.2 m/s | 3.2 |
| 1988 | 21.3°C | 18.5°C | 15.6°C | 27.6°C | 13.5°C | 125 mm | 71% | 4.5 m/s | 3 |
| 1987 ❄️ | 20.4°C | 16.5°C | 12.6°C | 25.4°C | 9.5°C | 98 mm | 69% | 3.7 m/s | 3 |
| 1986 | 20.8°C | 17.5°C | 14.1°C | 25.1°C | 9.7°C | 113 mm | 70% | 4 m/s | 3.1 |
| 1985 | 22.7°C | 18.0°C | 13.2°C | 27.6°C | 9.9°C | 38 mm | 58% | 4.1 m/s | 3.4 |
| 1984 | 20.8°C | 18.1°C | 15.4°C | 24.3°C | 10.9°C | 158 mm | 71% | 4.5 m/s | 2.9 |
| 1983 | 22.9°C | 19.0°C | 15.1°C | 27.9°C | 11.0°C | 22 mm | 65% | 3.6 m/s | — |
| 1982 | 21.1°C | 17.7°C | 14.3°C | 25.6°C | 8.9°C | 61 mm | 69% | 3.6 m/s | — |
| 1981 🌧️ | 22.3°C | 18.4°C | 14.4°C | 27.6°C | 10.6°C | 161 mm | 62% | 4.9 m/s | — |
Actual recorded May data for each year, 1981–2025 — sourced from NASA POWER.
The average high in May is around 22.2°C with lows near 14.5°C (mean 18.4°C), based on 45 years of NASA POWER data.
May averages 76 mm of rainfall in Yanchep, a relatively wet time of year. The wettest on record was 161 mm in 1981.
The hottest May reached 31.1°C in 2002. The coldest dipped to 8.2°C in 2006.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average May temperatures have risen by about 1°C. Daytime highs moved from 22°C to 23.3°C and overnight lows from 14.5°C to 15°C over the same span.
May is one of the cooler months of the year in Yanchep and a relatively wet time of year, so plan for around 22.2°C daytime highs and 14.5°C at night.
Not quite — May is the 6th coolest month in Yanchep, averaging 18.4°C.
For May in Yanchep, pack light layers you can adjust through the day, with typical highs of 22.2°C and lows of 14.5°C. Bring an umbrella or light rain jacket too.
Relative humidity in May averages 67% — moderately humid.
Average wind speed in May is 4 m/s. The windiest May on record averaged 4.9 m/s (1981).
The wettest May on record was 1981 with 161 mm. On average, May sees 76 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 Yanchep 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.
