May is one of the cooler months of the year in Wallaroo, with average highs near 18.4°C and lows around 12.9°C (mean 15.7°C). It is about average for rainfall, averaging 33 mm of rainfall and 71% relative humidity across the period.
May is one of the cooler months of the year in Wallaroo. Across 45 years of records, the warmest Mays in Wallaroo were 2002 and 2013 — when the month averaged 16.9°C — while the coldest was 2006 at 14.1°C. Typical May days reach 18.4°C with nights near 12.9°C. The long-term May temperature trend is broadly flat.
May is about average for rainfall in Wallaroo, averaging 33 mm of rainfall. The wettest May on record was 2013 with 64 mm, while the driest was 2024 at 6 mm.
Relative humidity in Wallaroo during May averages 71%. The most humid May was 2009 at 75%, and the least humid was 2021 at 64%.
May receives about 3.1 kWh/m²/day of solar energy in Wallaroo. The sunniest May was 2025 at 3.6 kWh/m²/day, and the cloudiest was 1997 at 2.8.
Average wind speed in Wallaroo during May is 4.4 m/s. The windiest Mays were 2007 and 2016 at 5.5 m/s, while the calmest were 2008, 2009 and 2024 at 3.6 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 15.5°C | 15.5°C | 15.8°C | 15.9°C | 15.6°C | +0.1°C |
| Avg High | 18.2°C | 18.3°C | 18.6°C | 18.5°C | 18.6°C | +0.4°C |
| Avg Low | 12.7°C | 12.8°C | 13.0°C | 13.2°C | 12.7°C | 0°C |
| Avg Rain | 37 mm | 28 mm | 31 mm | 45 mm | 22 mm | -15 mm |
May temperatures in Wallaroo have risen by about 0.6°C between 1981–1985 and 2021–2025.
May has ranged from a record low of 8.1°C (2020) to a record high of 26.5°C (2005).
Rainfall in May is about average for rainfall, averaging 33 mm, with a wettest year of 64 mm.
A good time to visit Wallaroo
May is a good time to visit Wallaroo, with days averaging 18.4°C and nights around 12.9°C (mean 15.7°C, cooler than Wallaroo's yearly average) and moderate rainfall. March 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 | 19.7°C | 16.4°C | 13.1°C | 25.7°C | 9.0°C | 14 mm | 66% | 4.2 m/s | 3.6 |
| 2024 | 19.5°C | 15.8°C | 12.1°C | 22.2°C | 9.2°C | 6 mm | 67% | 3.6 m/s | 3.5 |
| 2023 | 17.9°C | 15.3°C | 12.7°C | 20.8°C | 10.9°C | 34 mm | 73% | 4.1 m/s | 3 |
| 2022 | 18.4°C | 15.7°C | 12.9°C | 22.5°C | 9.3°C | 38 mm | 71% | 4.4 m/s | 3.3 |
| 2021 | 18.7°C | 16.1°C | 13.4°C | 25.1°C | 8.9°C | 9 mm | 64% | 4.3 m/s | 3 |
| 2020 | 17.1°C | 14.4°C | 11.7°C | 21.6°C | 8.1°C | 30 mm | 71% | 5.2 m/s | 3.2 |
| 2019 | 18.1°C | 15.4°C | 12.7°C | 22.0°C | 10.6°C | 61 mm | 70% | 4.7 m/s | 3 |
| 2018 | 18.5°C | 16.0°C | 13.4°C | 25.2°C | 10.0°C | 35 mm | 69% | 4.7 m/s | 3 |
| 2017 | 18.6°C | 15.7°C | 12.7°C | 22.3°C | 9.0°C | 16 mm | 68% | 4.1 m/s | 3.3 |
| 2016 | 19.3°C | 16.7°C | 14.1°C | 23.7°C | 12.5°C | 48 mm | 71% | 5.5 m/s | 3 |
| 2015 | 17.5°C | 15.0°C | 12.4°C | 24.8°C | 9.2°C | 35 mm | 74% | 4.7 m/s | 3 |
| 2014 | 19.4°C | 16.8°C | 14.2°C | 24.0°C | 11.0°C | 52 mm | 74% | 4.1 m/s | 3 |
| 2013 🌧️ | 19.7°C | 16.9°C | 14.0°C | 25.8°C | 11.2°C | 64 mm | 71% | 4.7 m/s | 3 |
| 2012 | 17.8°C | 15.1°C | 12.5°C | 25.3°C | 9.3°C | 48 mm | 73% | 4.3 m/s | 3 |
| 2011 | 17.3°C | 14.9°C | 12.6°C | 21.5°C | 9.6°C | 36 mm | 72% | 4.4 m/s | 3 |
| 2010 | 18.6°C | 16.0°C | 13.4°C | 24.6°C | 11.1°C | 51 mm | 71% | 4.3 m/s | 2.9 |
| 2009 | 18.2°C | 15.5°C | 12.8°C | 21.2°C | 9.3°C | 18 mm | 75% | 3.6 m/s | 3 |
| 2008 | 18.7°C | 15.9°C | 13.1°C | 22.4°C | 11.3°C | 31 mm | 73% | 3.6 m/s | 3.3 |
| 2007 | 19.5°C | 16.6°C | 13.7°C | 24.0°C | 10.6°C | 30 mm | 73% | 5.5 m/s | 3.2 |
| 2006 ❄️ | 16.8°C | 14.1°C | 11.5°C | 20.2°C | 8.5°C | 32 mm | 73% | 4 m/s | 3.2 |
| 2005 | 19.7°C | 16.6°C | 13.6°C | 26.5°C | 10.5°C | 10 mm | 69% | 4 m/s | 3.2 |
| 2004 | 18.1°C | 15.3°C | 12.5°C | 20.6°C | 9.9°C | 23 mm | 70% | 4.3 m/s | 3.2 |
| 2003 | 19.0°C | 16.0°C | 13.0°C | 22.8°C | 9.5°C | 38 mm | 71% | 4.3 m/s | 3.1 |
| 2002 🔥 | 19.8°C | 16.9°C | 14.0°C | 26.2°C | 9.4°C | 34 mm | 64% | 4.3 m/s | 3.1 |
| 2001 | 18.3°C | 15.6°C | 13.0°C | 23.8°C | 8.8°C | 46 mm | 69% | 4 m/s | 3.2 |
| 2000 | 17.5°C | 15.1°C | 12.7°C | 21.5°C | 10.1°C | 44 mm | 73% | 4.7 m/s | 3.2 |
| 1999 | 18.8°C | 16.0°C | 13.2°C | 23.2°C | 8.5°C | 42 mm | 69% | 4.5 m/s | 2.9 |
| 1998 | 18.5°C | 15.6°C | 12.6°C | 23.1°C | 10.3°C | 13 mm | 70% | 4 m/s | 3.1 |
| 1997 | 17.6°C | 15.1°C | 12.6°C | 24.9°C | 9.4°C | 44 mm | 73% | 3.9 m/s | 2.8 |
| 1996 | 18.5°C | 15.5°C | 12.5°C | 24.1°C | 10.5°C | 9 mm | 72% | 3.7 m/s | 3.2 |
| 1995 | 17.0°C | 14.5°C | 12.1°C | 22.0°C | 9.9°C | 37 mm | 73% | 4.6 m/s | 3.1 |
| 1994 | 18.7°C | 15.9°C | 13.0°C | 25.3°C | 10.3°C | 17 mm | 68% | 5.3 m/s | 3.5 |
| 1993 | 19.1°C | 16.2°C | 13.4°C | 24.5°C | 9.5°C | 26 mm | 70% | 3.9 m/s | 3.1 |
| 1992 | 17.3°C | 14.9°C | 12.4°C | 23.4°C | 9.5°C | 50 mm | 74% | 4.1 m/s | 3.1 |
| 1991 | 18.2°C | 15.4°C | 12.5°C | 21.5°C | 10.2°C | 16 mm | 68% | 3.8 m/s | 3.2 |
| 1990 | 19.2°C | 16.2°C | 13.3°C | 25.9°C | 8.5°C | 23 mm | 70% | 4.9 m/s | 3.2 |
| 1989 | 18.3°C | 15.8°C | 13.2°C | 21.7°C | 10.1°C | 50 mm | 74% | 4.3 m/s | 3 |
| 1988 | 19.1°C | 16.6°C | 14.0°C | 25.8°C | 10.6°C | 48 mm | 73% | 4.6 m/s | 2.9 |
| 1987 | 17.8°C | 15.1°C | 12.3°C | 23.1°C | 8.9°C | 54 mm | 73% | 5 m/s | 3 |
| 1986 | 18.1°C | 15.4°C | 12.6°C | 21.7°C | 9.1°C | 24 mm | 71% | 4.3 m/s | 3.2 |
| 1985 | 17.9°C | 15.0°C | 12.1°C | 24.3°C | 8.6°C | 23 mm | 66% | 4.1 m/s | 3.4 |
| 1984 | 18.6°C | 15.6°C | 12.6°C | 23.0°C | 10.6°C | 26 mm | 69% | 4.4 m/s | 3.1 |
| 1983 | 17.9°C | 15.0°C | 12.1°C | 21.4°C | 9.7°C | 34 mm | 73% | 4.2 m/s | — |
| 1982 | 18.3°C | 15.5°C | 12.8°C | 23.7°C | 9.8°C | 27 mm | 69% | 4.6 m/s | — |
| 1981 | 18.1°C | 15.3°C | 12.6°C | 24.8°C | 8.6°C | 43 mm | 70% | 5.4 m/s | — |
Actual recorded May data for each year, 1981–2025 — sourced from NASA POWER.
The average high in May is around 18.4°C with lows near 12.9°C (mean 15.7°C), based on 45 years of NASA POWER data.
May averages 33 mm of rainfall in Wallaroo, about average for rainfall. The wettest on record was 64 mm in 2013.
The hottest May reached 26.5°C in 2005. The coldest dipped to 8.1°C in 2020.
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 18.2°C to 18.8°C and overnight lows from 12.4°C to 12.8°C over the same span.
May is one of the cooler months of the year in Wallaroo and about average for rainfall, so plan for around 18.4°C daytime highs and 12.9°C at night.
Not quite — May is the 5th coolest month in Wallaroo, averaging 15.7°C.
For May in Wallaroo, pack light layers you can adjust through the day, with typical highs of 18.4°C and lows of 12.9°C.
Relative humidity in May averages 71% — moderately humid.
Average wind speed in May is 4.4 m/s. The windiest May on record averaged 5.5 m/s (2007).
The wettest May on record was 2013 with 64 mm. On average, May sees 33 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 Wallaroo 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.
