May is one of the cooler months of the year in Waiuku, with average highs near 17°C and lows around 12.4°C (mean 14.7°C). It is a relatively wet time of year, averaging 106 mm of rainfall and 81% relative humidity across the period.
May is one of the cooler months of the year in Waiuku. Across 45 years of records, the warmest May in Waiuku was 2016 — when the month averaged 16.7°C — while the coldest was 1992 at 12.4°C. Typical May days reach 17°C with nights near 12.4°C. The long-term trend is warming, about 0.2°C per decade.
May is a relatively wet time of year in Waiuku, averaging 106 mm of rainfall. The wettest May on record was 2023 with 234 mm, while the driest was 1993 at 9 mm.
Relative humidity in Waiuku during May averages 81%. The most humid May was 2023 at 87%, and the least humid was 1994 at 78%.
May receives about 2.3 kWh/m²/day of solar energy in Waiuku. The sunniest May was 1985 at 2.7 kWh/m²/day, and the cloudiest were 1988 and 1998 at 2.1.
Average wind speed in Waiuku during May is 4.5 m/s. The windiest May was 1994 at 6.2 m/s, while the calmest was 2008 at 3.6 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 14.3°C | 14.4°C | 14.9°C | 15.0°C | 15.0°C | +0.7°C |
| Avg High | 16.6°C | 16.7°C | 17.2°C | 17.4°C | 17.3°C | +0.7°C |
| Avg Low | 11.9°C | 12.2°C | 12.7°C | 12.6°C | 12.7°C | +0.8°C |
| Avg Rain | 98 mm | 73 mm | 120 mm | 110 mm | 144 mm | +46 mm |
May temperatures in Waiuku have risen by about 1°C between 1981–1985 and 2021–2025.
May has ranged from a record low of 5.3°C (2009) to a record high of 21.8°C (1989).
Rainfall in May is a relatively wet time of year, averaging 106 mm, with a wettest year of 234 mm.
A good time to visit Waiuku
May is a good time to visit Waiuku, with days averaging 17°C and nights around 12.4°C (mean 14.7°C, cooler than Waiuku's yearly average) and higher rainfall. February and January 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 | 17.8°C | 15.3°C | 12.9°C | 20.4°C | 9.1°C | 137 mm | 82% | 4.1 m/s | 2.5 |
| 2024 | 16.1°C | 13.8°C | 11.5°C | 18.8°C | 6.1°C | 114 mm | 81% | 4.4 m/s | 2.5 |
| 2023 🌧️ | 17.6°C | 15.8°C | 13.9°C | 21.2°C | 9.0°C | 234 mm | 87% | 5.2 m/s | 2.2 |
| 2022 | 18.1°C | 15.7°C | 13.3°C | 20.3°C | 8.2°C | 137 mm | 82% | 4.2 m/s | 2.5 |
| 2021 | 17.2°C | 14.9°C | 12.5°C | 20.1°C | 8.2°C | 79 mm | 81% | 4.2 m/s | 2.5 |
| 2020 | 17.1°C | 14.6°C | 12.1°C | 20.3°C | 7.6°C | 160 mm | 83% | 4.3 m/s | 2.3 |
| 2019 | 18.2°C | 15.7°C | 13.3°C | 20.3°C | 9.0°C | 56 mm | 80% | 3.9 m/s | 2.5 |
| 2018 | 17.3°C | 15.1°C | 12.8°C | 20.5°C | 6.5°C | 91 mm | 82% | 4.5 m/s | 2.5 |
| 2017 | 16.7°C | 14.3°C | 11.9°C | 19.4°C | 6.9°C | 123 mm | 80% | 4.1 m/s | 2.4 |
| 2016 🔥 | 19.1°C | 16.7°C | 14.3°C | 21.5°C | 11.3°C | 121 mm | 83% | 4.8 m/s | 2.2 |
| 2015 | 17.0°C | 14.6°C | 12.3°C | 21.3°C | 7.4°C | 92 mm | 79% | 4.6 m/s | 2.2 |
| 2014 | 17.3°C | 14.6°C | 12.0°C | 20.5°C | 5.6°C | 61 mm | 79% | 3.7 m/s | 2.5 |
| 2013 | 17.3°C | 14.9°C | 12.5°C | 20.5°C | 6.7°C | 186 mm | 82% | 4.2 m/s | 2.2 |
| 2012 | 16.3°C | 13.6°C | 11.0°C | 18.7°C | 6.0°C | 73 mm | 81% | 4.6 m/s | 2.5 |
| 2011 | 17.8°C | 15.7°C | 13.7°C | 20.7°C | 8.8°C | 140 mm | 84% | 4.8 m/s | 2.2 |
| 2010 | 17.2°C | 14.9°C | 12.6°C | 19.7°C | 9.8°C | 158 mm | 80% | 4.5 m/s | 2.3 |
| 2009 | 15.4°C | 12.9°C | 10.4°C | 19.1°C | 5.3°C | 124 mm | 81% | 5 m/s | 2.2 |
| 2008 | 16.3°C | 13.8°C | 11.4°C | 17.7°C | 8.0°C | 111 mm | 80% | 3.6 m/s | 2.6 |
| 2007 | 18.3°C | 15.9°C | 13.5°C | 21.6°C | 10.6°C | 14 mm | 81% | 3.8 m/s | 2.4 |
| 2006 | 16.8°C | 14.6°C | 12.5°C | 19.6°C | 8.0°C | 154 mm | 83% | 4.6 m/s | 2.3 |
| 2005 | 17.9°C | 15.7°C | 13.4°C | 20.7°C | 8.8°C | 182 mm | 85% | 4.5 m/s | 2.3 |
| 2004 | 17.0°C | 14.8°C | 12.5°C | 20.1°C | 8.8°C | 207 mm | 86% | 4.5 m/s | 2.4 |
| 2003 | 17.6°C | 15.4°C | 13.3°C | 20.6°C | 7.8°C | 90 mm | 81% | 4.2 m/s | 2.4 |
| 2002 | 17.2°C | 15.3°C | 13.5°C | 19.0°C | 10.6°C | 47 mm | 78% | 5.9 m/s | 2.2 |
| 2001 | 17.3°C | 15.3°C | 13.3°C | 21.1°C | 7.0°C | 170 mm | 84% | 5.5 m/s | 2.2 |
| 2000 | 17.7°C | 15.4°C | 13.2°C | 21.0°C | 10.6°C | 96 mm | 82% | 4.6 m/s | 2.2 |
| 1999 | 17.9°C | 15.4°C | 12.9°C | 20.8°C | 8.6°C | 36 mm | 80% | 4.1 m/s | 2.3 |
| 1998 | 17.6°C | 15.3°C | 13.1°C | 19.3°C | 9.3°C | 55 mm | 79% | 5.1 m/s | 2.1 |
| 1997 | 17.3°C | 15.1°C | 13.0°C | 19.4°C | 11.7°C | 108 mm | 82% | 3.8 m/s | 2.2 |
| 1996 | 16.3°C | 13.7°C | 11.2°C | 19.0°C | 6.8°C | 113 mm | 80% | 5.1 m/s | 2.3 |
| 1995 | 17.1°C | 14.9°C | 12.7°C | 20.5°C | 8.7°C | 101 mm | 81% | 4.5 m/s | 2.4 |
| 1994 | 17.4°C | 15.0°C | 12.7°C | 20.0°C | 8.5°C | 15 mm | 78% | 6.2 m/s | 2.4 |
| 1993 | 16.4°C | 14.2°C | 11.9°C | 18.5°C | 8.1°C | 9 mm | 80% | 4.8 m/s | 2.3 |
| 1992 ❄️ | 14.6°C | 12.4°C | 10.1°C | 19.0°C | 5.5°C | 87 mm | 82% | 5 m/s | 2.2 |
| 1991 | 15.6°C | 13.5°C | 11.5°C | 18.3°C | 9.3°C | 50 mm | 82% | 4.4 m/s | 2.3 |
| 1990 | 16.8°C | 14.8°C | 12.9°C | 18.9°C | 9.7°C | 154 mm | 80% | 5.3 m/s | 2.3 |
| 1989 | 16.9°C | 14.5°C | 12.0°C | 21.8°C | 6.6°C | 106 mm | 81% | 4.2 m/s | 2.3 |
| 1988 | 17.0°C | 14.7°C | 12.5°C | 20.3°C | 9.2°C | 112 mm | 85% | 4.5 m/s | 2.1 |
| 1987 | 16.6°C | 14.2°C | 11.7°C | 18.6°C | 8.6°C | 71 mm | 81% | 3.8 m/s | 2.2 |
| 1986 | 17.0°C | 14.7°C | 12.3°C | 18.9°C | 6.6°C | 175 mm | 81% | 4.4 m/s | 2.5 |
| 1985 | 16.2°C | 13.6°C | 11.1°C | 18.9°C | 7.8°C | 108 mm | 81% | 3.9 m/s | 2.7 |
| 1984 | 16.3°C | 14.2°C | 12.0°C | 19.4°C | 6.1°C | 83 mm | 80% | 4.7 m/s | 2.2 |
| 1983 | 15.8°C | 13.5°C | 11.2°C | 20.0°C | 6.4°C | 81 mm | 82% | 5.5 m/s | — |
| 1982 | 16.9°C | 14.4°C | 11.9°C | 19.4°C | 8.0°C | 84 mm | 79% | 4.9 m/s | — |
| 1981 | 17.1°C | 14.6°C | 12.0°C | 20.6°C | 8.0°C | 59 mm | 80% | 4.1 m/s | — |
Actual recorded May data for each year, 1981–2025 — sourced from NASA POWER.
The average high in May is around 17°C with lows near 12.4°C (mean 14.7°C), based on 45 years of NASA POWER data.
May averages 106 mm of rainfall in Waiuku, a relatively wet time of year. The wettest on record was 234 mm in 2023.
The hottest May reached 21.8°C in 1989. The coldest dipped to 5.3°C in 2009.
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 16.5°C to 17.4°C and overnight lows from 11.6°C to 12.8°C over the same span.
May is one of the cooler months of the year in Waiuku and a relatively wet time of year, so plan for around 17°C daytime highs and 12.4°C at night.
Not quite — May is the 6th coolest month in Waiuku, averaging 14.7°C.
For May in Waiuku, pack light layers you can adjust through the day, with typical highs of 17°C and lows of 12.4°C. Bring an umbrella or light rain jacket too.
Relative humidity in May averages 81% — quite humid.
Average wind speed in May is 4.5 m/s. The windiest May on record averaged 6.2 m/s (1994).
The wettest May on record was 2023 with 234 mm. On average, May sees 106 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 Waiuku 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.
