May is one of the cooler months of the year in Wonthaggi, with average highs near 15.9°C and lows around 10.6°C (mean 13.3°C). It is about average for rainfall, averaging 79 mm of rainfall and 79% relative humidity across the period.
May is one of the cooler months of the year in Wonthaggi. Across 45 years of records, the warmest May in Wonthaggi was 2007 — when the month averaged 15.3°C — while the coldest was 1995 at 11.9°C. Typical May days reach 15.9°C with nights near 10.6°C. The long-term May temperature trend is broadly flat.
May is about average for rainfall in Wonthaggi, averaging 79 mm of rainfall. The wettest May on record was 2012 with 168 mm, while the driest was 2025 at 25 mm.
Relative humidity in Wonthaggi during May averages 79%. The most humid May was 1983 at 86%, and the least humid was 2025 at 71%.
May receives about 2.2 kWh/m²/day of solar energy in Wonthaggi. The sunniest Mays were 2003, 2024 and 2025, among others at 2.6 kWh/m²/day, and the cloudiest was 1997 at 1.9.
Average wind speed in Wonthaggi during May is 1.7 m/s. The windiest Mays were 1994 and 2016 at 2.2 m/s, while the calmest was 1991 at 1.3 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 13.1°C | 12.9°C | 13.3°C | 13.5°C | 13.2°C | +0.1°C |
| Avg High | 15.8°C | 15.5°C | 16.0°C | 16.1°C | 16.0°C | +0.2°C |
| Avg Low | 10.4°C | 10.3°C | 10.7°C | 10.9°C | 10.4°C | 0°C |
| Avg Rain | 103 mm | 68 mm | 72 mm | 89 mm | 54 mm | -49 mm |
May temperatures in Wonthaggi have risen by about 0.6°C between 1981–1985 and 2021–2025.
May has ranged from a record low of 4.8°C (2021) to a record high of 24.3°C (1988).
Rainfall in May is about average for rainfall, averaging 79 mm, with a wettest year of 168 mm.
A good time to visit Wonthaggi
May is a good time to visit Wonthaggi, with days averaging 15.9°C and nights around 10.6°C (mean 13.3°C, cooler than Wonthaggi's yearly average) and moderate 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 | 17.6°C | 14.4°C | 11.3°C | 23.6°C | 6.0°C | 25 mm | 71% | 1.6 m/s | 2.6 |
| 2024 | 16.9°C | 13.7°C | 10.5°C | 20.0°C | 7.2°C | 26 mm | 79% | 1.5 m/s | 2.6 |
| 2023 | 15.2°C | 12.9°C | 10.6°C | 19.5°C | 8.2°C | 73 mm | 77% | 1.9 m/s | 2.3 |
| 2022 | 15.8°C | 13.1°C | 10.4°C | 19.7°C | 7.0°C | 46 mm | 80% | 1.6 m/s | 2.2 |
| 2021 | 16.1°C | 13.1°C | 10.1°C | 22.7°C | 4.8°C | 78 mm | 76% | 1.7 m/s | 2.4 |
| 2020 | 14.3°C | 12.0°C | 9.6°C | 17.7°C | 6.8°C | 77 mm | 82% | 1.8 m/s | 2.3 |
| 2019 | 16.7°C | 14.0°C | 11.4°C | 22.2°C | 7.9°C | 103 mm | 76% | 1.8 m/s | 2.2 |
| 2018 | 16.4°C | 13.9°C | 11.4°C | 23.3°C | 7.6°C | 78 mm | 75% | 1.9 m/s | 2.1 |
| 2017 | 16.4°C | 13.6°C | 10.8°C | 19.7°C | 7.0°C | 48 mm | 76% | 1.6 m/s | 2.4 |
| 2016 | 17.0°C | 14.4°C | 11.9°C | 23.2°C | 7.2°C | 80 mm | 72% | 2.2 m/s | 2.2 |
| 2015 | 15.6°C | 13.0°C | 10.3°C | 21.1°C | 6.8°C | 91 mm | 78% | 2.1 m/s | 2.2 |
| 2014 | 17.2°C | 14.4°C | 11.7°C | 21.6°C | 6.4°C | 57 mm | 79% | 1.5 m/s | 2.2 |
| 2013 | 16.4°C | 13.5°C | 10.6°C | 23.8°C | 8.0°C | 88 mm | 77% | 1.7 m/s | 2.2 |
| 2012 🌧️ | 14.7°C | 12.7°C | 10.7°C | 19.9°C | 7.8°C | 168 mm | 81% | 1.9 m/s | 2.2 |
| 2011 | 14.0°C | 12.1°C | 10.1°C | 18.4°C | 6.6°C | 93 mm | 83% | 1.6 m/s | 2 |
| 2010 | 16.2°C | 13.3°C | 10.5°C | 21.3°C | 6.7°C | 81 mm | 82% | 1.6 m/s | 2.4 |
| 2009 | 15.8°C | 13.1°C | 10.3°C | 20.5°C | 6.7°C | 38 mm | 82% | 1.6 m/s | 2.3 |
| 2008 | 15.7°C | 13.0°C | 10.3°C | 19.5°C | 6.4°C | 58 mm | 81% | 1.5 m/s | 2.2 |
| 2007 🔥 | 17.8°C | 15.3°C | 12.8°C | 22.0°C | 9.6°C | 85 mm | 75% | 1.9 m/s | 2.1 |
| 2006 | 14.5°C | 12.1°C | 9.7°C | 17.3°C | 7.4°C | 100 mm | 84% | 1.7 m/s | 2.2 |
| 2005 | 16.6°C | 13.8°C | 11.1°C | 22.0°C | 8.4°C | 32 mm | 75% | 1.7 m/s | 2.3 |
| 2004 | 15.1°C | 12.7°C | 10.3°C | 18.6°C | 8.0°C | 81 mm | 80% | 1.9 m/s | 2.1 |
| 2003 | 16.8°C | 13.6°C | 10.4°C | 20.6°C | 7.2°C | 46 mm | 79% | 1.4 m/s | 2.6 |
| 2002 | 16.8°C | 13.9°C | 11.0°C | 23.2°C | 8.3°C | 95 mm | 78% | 1.5 m/s | 2.3 |
| 2001 | 15.1°C | 12.8°C | 10.5°C | 18.7°C | 9.0°C | 42 mm | 85% | 1.4 m/s | 2.3 |
| 2000 | 15.3°C | 13.0°C | 10.6°C | 19.0°C | 6.6°C | 144 mm | 79% | 2.1 m/s | 2.1 |
| 1999 | 16.5°C | 13.8°C | 11.1°C | 21.2°C | 7.6°C | 88 mm | 76% | 1.7 m/s | 2.1 |
| 1998 | 16.0°C | 13.4°C | 10.9°C | 20.9°C | 8.6°C | 71 mm | 78% | 1.7 m/s | 2.1 |
| 1997 | 15.8°C | 13.0°C | 10.3°C | 24.0°C | 7.8°C | 95 mm | 79% | 1.5 m/s | 1.9 |
| 1996 | 15.1°C | 12.5°C | 9.9°C | 20.4°C | 6.0°C | 35 mm | 83% | 1.5 m/s | 2 |
| 1995 ❄️ | 14.4°C | 11.9°C | 9.5°C | 19.0°C | 5.9°C | 89 mm | 86% | 1.4 m/s | 2.2 |
| 1994 | 15.3°C | 12.9°C | 10.4°C | 20.0°C | 6.4°C | 87 mm | 75% | 2.2 m/s | 2.2 |
| 1993 | 15.9°C | 13.1°C | 10.3°C | 21.3°C | 6.8°C | 48 mm | 79% | 1.6 m/s | 2.2 |
| 1992 | 15.1°C | 12.7°C | 10.3°C | 22.1°C | 6.4°C | 83 mm | 83% | 1.5 m/s | 2.3 |
| 1991 | 15.8°C | 13.0°C | 10.2°C | 20.4°C | 7.8°C | 39 mm | 82% | 1.3 m/s | 2.2 |
| 1990 | 15.5°C | 13.0°C | 10.4°C | 21.7°C | 6.7°C | 44 mm | 78% | 1.7 m/s | 2.4 |
| 1989 | 16.6°C | 13.9°C | 11.3°C | 21.6°C | 7.6°C | 87 mm | 83% | 1.6 m/s | 2.2 |
| 1988 | 16.8°C | 14.2°C | 11.7°C | 24.3°C | 7.5°C | 114 mm | 84% | 1.4 m/s | 2 |
| 1987 | 15.7°C | 13.0°C | 10.2°C | 21.9°C | 6.6°C | 112 mm | 81% | 1.7 m/s | 2.1 |
| 1986 | 15.1°C | 12.6°C | 10.2°C | 19.3°C | 7.1°C | 111 mm | 83% | 1.5 m/s | 2.2 |
| 1985 | 15.7°C | 13.0°C | 10.3°C | 21.9°C | 6.6°C | 90 mm | 83% | 1.5 m/s | 2.4 |
| 1984 | 15.7°C | 12.6°C | 9.4°C | 20.0°C | 6.9°C | 39 mm | 79% | 1.5 m/s | 2.6 |
| 1983 | 15.3°C | 12.8°C | 10.3°C | 18.9°C | 6.0°C | 140 mm | 86% | 1.8 m/s | — |
| 1982 | 15.3°C | 12.7°C | 10.1°C | 20.0°C | 7.0°C | 121 mm | 78% | 2 m/s | — |
| 1981 | 15.9°C | 12.9°C | 10.0°C | 21.6°C | 5.5°C | 114 mm | 79% | 1.6 m/s | — |
Actual recorded May data for each year, 1981–2025 — sourced from NASA POWER.
The average high in May is around 15.9°C with lows near 10.6°C (mean 13.3°C), based on 45 years of NASA POWER data.
May averages 79 mm of rainfall in Wonthaggi, about average for rainfall. The wettest on record was 168 mm in 2012.
The hottest May reached 24.3°C in 1988. The coldest dipped to 4.8°C in 2021.
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 15.6°C to 16.3°C and overnight lows from 10°C to 10.6°C over the same span.
May is one of the cooler months of the year in Wonthaggi and about average for rainfall, so plan for around 15.9°C daytime highs and 10.6°C at night.
Not quite — May is the 5th coolest month in Wonthaggi, averaging 13.3°C.
For May in Wonthaggi, pack light layers you can adjust through the day, with typical highs of 15.9°C and lows of 10.6°C. Bring an umbrella or light rain jacket too.
Relative humidity in May averages 79% — quite humid.
Average wind speed in May is 1.7 m/s. The windiest May on record averaged 2.2 m/s (1994).
The wettest May on record was 2012 with 168 mm. On average, May sees 79 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 Wonthaggi 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.
