May is one of the cooler months of the year in Busselton, with average highs near 20.3°C and lows around 12°C (mean 16.2°C). It is a relatively wet time of year, averaging 99 mm of rainfall and 73% relative humidity across the period.
May is one of the cooler months of the year in Busselton. Across 45 years of records, the warmest May in Busselton was 2024 — when the month averaged 18.7°C — while the coldest was 2015 at 14.6°C. Typical May days reach 20.3°C with nights near 12°C. The long-term trend is warming, about 0.2°C per decade.
May is a relatively wet time of year in Busselton, averaging 99 mm of rainfall. The wettest May on record was 1999 with 189 mm, while the driest was 2019 at 33 mm.
Relative humidity in Busselton during May averages 73%. The most humid May was 2008 at 81%, and the least humid was 2018 at 63%.
May receives about 2.8 kWh/m²/day of solar energy in Busselton. The sunniest Mays were 2009, 2018 and 2019 at 3.2 kWh/m²/day, and the cloudiest were 1999, 2007 and 2014 at 2.4.
Average wind speed in Busselton during May is 3.3 m/s. The windiest Mays were 1984 and 1988 at 3.9 m/s, while the calmest were 1982, 2008 and 2012 at 2.8 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 15.9°C | 16.1°C | 16.4°C | 16.0°C | 16.7°C | +0.8°C |
| Avg High | 19.8°C | 20.2°C | 20.6°C | 20.3°C | 21.2°C | +1.4°C |
| Avg Low | 11.9°C | 12.1°C | 12.2°C | 11.6°C | 12.3°C | +0.4°C |
| Avg Rain | 103 mm | 116 mm | 98 mm | 91 mm | 77 mm | -26 mm |
May temperatures in Busselton have risen by about 1.1°C between 1981–1985 and 2021–2025.
May has ranged from a record low of 5.3°C (2006) to a record high of 28.9°C (1994).
Rainfall in May is a relatively wet time of year, averaging 99 mm, with a wettest year of 189 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 Busselton
May is a good time to visit Busselton, with days averaging 20.3°C and nights around 12°C (mean 16.2°C, cooler than Busselton'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 | 22.6°C | 17.5°C | 12.3°C | 27.7°C | 7.5°C | 34 mm | 68% | 3.4 m/s | 3.1 |
| 2024 🔥 | 23.3°C | 18.7°C | 14.1°C | 28.8°C | 11.4°C | 78 mm | 66% | 3.4 m/s | 2.8 |
| 2023 | 20.7°C | 16.0°C | 11.4°C | 24.8°C | 6.9°C | 46 mm | 72% | 3.2 m/s | 2.9 |
| 2022 | 20.5°C | 16.2°C | 12.0°C | 24.5°C | 8.0°C | 91 mm | 73% | 3.1 m/s | 2.9 |
| 2021 | 20.2°C | 16.4°C | 12.7°C | 24.3°C | 8.6°C | 105 mm | 75% | 3.1 m/s | 2.5 |
| 2020 | 19.8°C | 15.5°C | 11.1°C | 24.8°C | 6.5°C | 105 mm | 72% | 3.8 m/s | 2.9 |
| 2019 | 20.4°C | 15.5°C | 10.6°C | 23.9°C | 7.0°C | 33 mm | 69% | 3.1 m/s | 3.2 |
| 2018 | 22.3°C | 17.2°C | 12.2°C | 27.2°C | 10.1°C | 60 mm | 63% | 3.5 m/s | 3.2 |
| 2017 | 20.5°C | 16.3°C | 12.0°C | 26.3°C | 8.4°C | 50 mm | 75% | 3.1 m/s | 2.9 |
| 2016 | 19.2°C | 15.4°C | 11.6°C | 22.5°C | 8.3°C | 74 mm | 76% | 3.3 m/s | 2.7 |
| 2015 ❄️ | 19.0°C | 14.6°C | 10.3°C | 22.6°C | 6.6°C | 95 mm | 76% | 3 m/s | 2.9 |
| 2014 | 19.5°C | 16.6°C | 13.6°C | 23.6°C | 7.3°C | 177 mm | 80% | 3.3 m/s | 2.4 |
| 2013 | 19.1°C | 15.2°C | 11.4°C | 22.5°C | 6.3°C | 189 mm | 79% | 3.1 m/s | 2.7 |
| 2012 | 20.8°C | 16.4°C | 11.9°C | 24.7°C | 6.6°C | 89 mm | 72% | 2.8 m/s | 2.9 |
| 2011 | 21.4°C | 16.6°C | 11.7°C | 24.5°C | 9.0°C | 73 mm | 73% | 3.2 m/s | 3 |
| 2010 | 20.4°C | 15.7°C | 11.0°C | 27.0°C | 8.1°C | 75 mm | 73% | 3 m/s | 2.8 |
| 2009 | 21.9°C | 16.8°C | 11.6°C | 27.5°C | 8.6°C | 88 mm | 64% | 3.2 m/s | 3.2 |
| 2008 | 20.1°C | 16.6°C | 13.1°C | 24.3°C | 10.3°C | 152 mm | 81% | 2.8 m/s | 2.6 |
| 2007 | 19.0°C | 15.7°C | 12.4°C | 25.3°C | 6.9°C | 51 mm | 76% | 3.2 m/s | 2.4 |
| 2006 | 20.5°C | 15.4°C | 10.4°C | 26.7°C | 5.3°C | 34 mm | 71% | 3 m/s | 3 |
| 2005 | 21.2°C | 17.7°C | 14.1°C | 26.3°C | 9.0°C | 164 mm | 79% | 3.8 m/s | 2.6 |
| 2004 | 19.8°C | 15.8°C | 11.8°C | 27.1°C | 6.8°C | 122 mm | 72% | 3.6 m/s | 2.8 |
| 2003 | 21.8°C | 17.4°C | 13.1°C | 28.7°C | 9.3°C | 108 mm | 69% | 3.6 m/s | 2.9 |
| 2002 | 20.4°C | 16.3°C | 12.2°C | 26.8°C | 7.8°C | 84 mm | 75% | 3.4 m/s | 3 |
| 2001 | 20.2°C | 16.2°C | 12.2°C | 26.7°C | 7.3°C | 125 mm | 76% | 3.1 m/s | 2.8 |
| 2000 | 20.6°C | 16.0°C | 11.4°C | 25.5°C | 7.4°C | 49 mm | 70% | 2.9 m/s | 2.9 |
| 1999 🌧️ | 20.8°C | 17.3°C | 13.9°C | 25.6°C | 7.4°C | 189 mm | 76% | 3.6 m/s | 2.4 |
| 1998 | 21.5°C | 17.0°C | 12.4°C | 27.2°C | 7.3°C | 84 mm | 71% | 3.2 m/s | 2.8 |
| 1997 | 19.9°C | 16.1°C | 12.3°C | 25.5°C | 7.3°C | 111 mm | 73% | 3.8 m/s | 2.7 |
| 1996 | 21.6°C | 16.8°C | 12.0°C | 25.4°C | 7.7°C | 78 mm | 70% | 3.2 m/s | 2.9 |
| 1995 | 19.5°C | 15.1°C | 10.7°C | 26.4°C | 6.5°C | 140 mm | 71% | 3.5 m/s | 3.1 |
| 1994 | 21.0°C | 16.7°C | 12.5°C | 28.9°C | 8.4°C | 140 mm | 74% | 3.6 m/s | 2.8 |
| 1993 | 19.5°C | 15.4°C | 11.3°C | 23.7°C | 8.6°C | 78 mm | 75% | 3.2 m/s | 2.8 |
| 1992 | 18.6°C | 15.0°C | 11.3°C | 21.4°C | 7.4°C | 123 mm | 78% | 3.4 m/s | 2.8 |
| 1991 | 20.2°C | 16.4°C | 12.7°C | 25.3°C | 9.2°C | 134 mm | 73% | 3.6 m/s | 2.7 |
| 1990 | 19.3°C | 15.4°C | 11.5°C | 22.7°C | 7.5°C | 86 mm | 79% | 3 m/s | 2.8 |
| 1989 | 20.8°C | 16.4°C | 12.0°C | 26.1°C | 7.3°C | 109 mm | 74% | 3.2 m/s | 2.8 |
| 1988 | 19.6°C | 16.3°C | 13.1°C | 24.2°C | 8.5°C | 179 mm | 78% | 3.9 m/s | 2.5 |
| 1987 | 19.0°C | 14.7°C | 10.3°C | 24.1°C | 7.4°C | 46 mm | 74% | 2.9 m/s | 2.7 |
| 1986 | 19.7°C | 16.0°C | 12.2°C | 24.5°C | 9.3°C | 112 mm | 74% | 3.5 m/s | 2.6 |
| 1985 | 20.2°C | 15.4°C | 10.7°C | 25.3°C | 6.6°C | 63 mm | 66% | 3 m/s | 2.8 |
| 1984 | 18.7°C | 15.6°C | 12.5°C | 21.5°C | 7.9°C | 148 mm | 76% | 3.9 m/s | 2.6 |
| 1983 | 20.9°C | 17.0°C | 13.0°C | 25.3°C | 8.3°C | 55 mm | 71% | 3.2 m/s | — |
| 1982 | 19.6°C | 15.6°C | 11.5°C | 22.3°C | 6.9°C | 51 mm | 73% | 2.8 m/s | — |
| 1981 | 20.0°C | 15.7°C | 11.4°C | 25.7°C | 6.4°C | 167 mm | 70% | 3.8 m/s | — |
Actual recorded May data for each year, 1981–2025 — sourced from NASA POWER.
The average high in May is around 20.3°C with lows near 12°C (mean 16.2°C), based on 45 years of NASA POWER data.
May averages 99 mm of rainfall in Busselton, a relatively wet time of year. The wettest on record was 189 mm in 1999.
The hottest May reached 28.9°C in 1994. The coldest dipped to 5.3°C in 2006.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average May temperatures have risen by about 1.1°C. Daytime highs moved from 19.9°C to 21.5°C and overnight lows from 11.8°C to 12.5°C over the same span.
May is one of the cooler months of the year in Busselton and a relatively wet time of year, so plan for around 20.3°C daytime highs and 12°C at night.
Not quite — May is the 6th coolest month in Busselton, averaging 16.2°C.
For May in Busselton, pack light layers you can adjust through the day, with typical highs of 20.3°C and lows of 12°C. Bring an umbrella or light rain jacket too.
Relative humidity in May averages 73% — moderately humid.
Average wind speed in May is 3.3 m/s. The windiest May on record averaged 3.9 m/s (1984).
The wettest May on record was 1999 with 189 mm. On average, May sees 99 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 Busselton 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.
