May is one of the cooler months of the year in Onslow, with average highs near 27.8°C and lows around 22.2°C (mean 25°C). It is a relatively wet time of year, averaging 42 mm of rainfall and 60% relative humidity across the period.
May is one of the cooler months of the year in Onslow. Across 45 years of records, the warmest May in Onslow was 1998 — when the month averaged 27.1°C — while the coldest was 2000 at 22.8°C. Typical May days reach 27.8°C with nights near 22.2°C. The long-term May temperature trend is broadly flat.
May is a relatively wet time of year in Onslow, averaging 42 mm of rainfall. The wettest May on record was 2022 with 247 mm, while the driest were 2017, 2019 and 2023, among others at 0 mm.
Relative humidity in Onslow during May averages 60%. The most humid May was 1999 at 69%, and the least humid was 2020 at 52%.
May receives about 4.4 kWh/m²/day of solar energy in Onslow. The sunniest Mays were 2017 and 2019 at 5.1 kWh/m²/day, and the cloudiest was 2022 at 3.6.
Average wind speed in Onslow during May is 3.9 m/s. The windiest May was 2000 at 5 m/s, while the calmest was 1983 at 3.2 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 25.0°C | 25.3°C | 24.9°C | 24.7°C | 25.3°C | +0.3°C |
| Avg High | 27.8°C | 27.9°C | 27.8°C | 27.6°C | 28.1°C | +0.3°C |
| Avg Low | 22.2°C | 22.7°C | 22.0°C | 21.8°C | 22.6°C | +0.4°C |
| Avg Rain | 46 mm | 48 mm | 22 mm | 35 mm | 71 mm | +25 mm |
May temperatures in Onslow have stayed relatively stable across the record.
May has ranged from a record low of 16.9°C (2020) to a record high of 33.7°C (1990).
Rainfall in May is a relatively wet time of year, averaging 42 mm, with a wettest year of 247 mm.
A good time to visit Onslow
May is a good time to visit Onslow, with days averaging 27.8°C and nights around 22.2°C (mean 25°C, close to Onslow's yearly average) and moderate rainfall. September and August 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 | 29.2°C | 26.3°C | 23.3°C | 32.2°C | 18.8°C | 11 mm | 53% | 3.8 m/s | 4.7 |
| 2024 | 28.6°C | 25.8°C | 23.0°C | 31.4°C | 19.3°C | 9 mm | 55% | 3.4 m/s | 4.7 |
| 2023 | 27.6°C | 24.8°C | 22.0°C | 30.1°C | 19.5°C | 0 mm | 53% | 3.7 m/s | 4.6 |
| 2022 🌧️ | 27.3°C | 25.1°C | 22.8°C | 31.1°C | 18.1°C | 247 mm | 66% | 4.1 m/s | 3.6 |
| 2021 | 27.7°C | 25.0°C | 22.3°C | 30.6°C | 18.3°C | 119 mm | 62% | 4.1 m/s | 4.2 |
| 2020 | 28.0°C | 25.0°C | 22.0°C | 30.8°C | 16.9°C | 37 mm | 52% | 4.2 m/s | 4.7 |
| 2019 | 28.9°C | 25.5°C | 22.2°C | 32.0°C | 19.4°C | 0 mm | 53% | 3.4 m/s | 5.1 |
| 2018 | 28.3°C | 25.1°C | 22.0°C | 31.4°C | 18.4°C | 4 mm | 54% | 4.6 m/s | 4.8 |
| 2017 | 28.3°C | 25.1°C | 22.0°C | 30.8°C | 19.0°C | 0 mm | 56% | 3.5 m/s | 5.1 |
| 2016 | 27.5°C | 24.9°C | 22.2°C | 29.6°C | 18.4°C | 23 mm | 63% | 3.9 m/s | 4.4 |
| 2015 | 26.0°C | 23.2°C | 20.4°C | 28.8°C | 18.2°C | 83 mm | 68% | 4.1 m/s | 3.7 |
| 2014 | 27.0°C | 24.6°C | 22.2°C | 30.0°C | 18.4°C | 133 mm | 69% | 3.4 m/s | 4 |
| 2013 | 27.1°C | 24.3°C | 21.4°C | 32.3°C | 18.0°C | 69 mm | 62% | 4.7 m/s | 4.1 |
| 2012 | 28.3°C | 25.2°C | 22.2°C | 30.9°C | 18.6°C | 0 mm | 56% | 3.5 m/s | 4.7 |
| 2011 | 26.3°C | 23.9°C | 21.4°C | 28.9°C | 19.2°C | 25 mm | 65% | 4.4 m/s | 4 |
| 2010 | 28.2°C | 25.2°C | 22.3°C | 32.2°C | 18.0°C | 8 mm | 56% | 4.2 m/s | 4.5 |
| 2009 | 27.4°C | 24.4°C | 21.5°C | 31.9°C | 18.1°C | 3 mm | 54% | 3.5 m/s | 4.4 |
| 2008 | 28.2°C | 24.8°C | 21.5°C | 31.4°C | 18.6°C | 0 mm | 59% | 3.6 m/s | 4.7 |
| 2007 | 28.3°C | 25.3°C | 22.2°C | 30.2°C | 18.8°C | 1 mm | 59% | 4 m/s | 4.5 |
| 2006 | 27.3°C | 24.3°C | 21.4°C | 28.7°C | 18.8°C | 44 mm | 63% | 3.5 m/s | 4.1 |
| 2005 | 28.5°C | 26.0°C | 23.5°C | 31.2°C | 20.5°C | 81 mm | 67% | 3.3 m/s | 4.2 |
| 2004 | 26.7°C | 23.9°C | 21.1°C | 30.4°C | 17.8°C | 20 mm | 59% | 4.6 m/s | 4.6 |
| 2003 | 28.4°C | 25.7°C | 23.0°C | 31.2°C | 19.3°C | 6 mm | 60% | 3.7 m/s | 4.4 |
| 2002 | 28.7°C | 26.3°C | 23.9°C | 32.1°C | 20.4°C | 57 mm | 66% | 3.5 m/s | 4.6 |
| 2001 | 28.0°C | 25.2°C | 22.4°C | 31.7°C | 19.0°C | 8 mm | 59% | 3.9 m/s | 4.5 |
| 2000 ❄️ | 26.0°C | 22.8°C | 19.6°C | 27.9°C | 17.1°C | 0 mm | 59% | 5 m/s | 4.6 |
| 1999 | 27.6°C | 25.2°C | 22.9°C | 29.6°C | 21.2°C | 94 mm | 69% | 3.9 m/s | 4.1 |
| 1998 🔥 | 29.4°C | 27.1°C | 24.8°C | 33.3°C | 21.3°C | 222 mm | 68% | 3.8 m/s | 3.8 |
| 1997 | 26.9°C | 24.9°C | 22.9°C | 29.0°C | 19.1°C | 30 mm | 67% | 4.4 m/s | 3.8 |
| 1996 | 28.4°C | 25.5°C | 22.6°C | 30.9°C | 20.4°C | 0 mm | 57% | 3.5 m/s | 4.7 |
| 1995 | 27.1°C | 24.2°C | 21.3°C | 29.9°C | 17.7°C | 4 mm | 61% | 4.7 m/s | 4.4 |
| 1994 | 29.1°C | 26.0°C | 22.8°C | 32.6°C | 19.0°C | 2 mm | 53% | 3.4 m/s | 4.9 |
| 1993 | 27.2°C | 24.8°C | 22.5°C | 29.6°C | 17.4°C | 14 mm | 62% | 4.4 m/s | 4 |
| 1992 | 26.4°C | 24.0°C | 21.7°C | 29.0°C | 17.9°C | 89 mm | 67% | 3.9 m/s | 3.7 |
| 1991 | 28.6°C | 26.1°C | 23.6°C | 32.2°C | 21.6°C | 27 mm | 61% | 3.6 m/s | 4.4 |
| 1990 | 28.4°C | 25.1°C | 21.9°C | 33.7°C | 17.8°C | 0 mm | 55% | 4.3 m/s | 4.7 |
| 1989 | 27.9°C | 25.3°C | 22.7°C | 30.1°C | 19.9°C | 58 mm | 60% | 3.5 m/s | 4.7 |
| 1988 | 26.8°C | 24.3°C | 21.7°C | 28.3°C | 18.7°C | 71 mm | 63% | 4.3 m/s | 4 |
| 1987 | 27.6°C | 24.6°C | 21.5°C | 31.3°C | 17.2°C | 24 mm | 53% | 4.3 m/s | 4 |
| 1986 | 27.2°C | 23.9°C | 20.6°C | 29.7°C | 18.5°C | 4 mm | 54% | 4.4 m/s | 4.6 |
| 1985 | 27.6°C | 24.6°C | 21.6°C | 30.8°C | 19.6°C | 46 mm | 56% | 3.6 m/s | 4.4 |
| 1984 | 28.1°C | 25.7°C | 23.4°C | 31.9°C | 19.0°C | 124 mm | 68% | 3.9 m/s | 3.8 |
| 1983 | 28.9°C | 26.1°C | 23.2°C | 31.2°C | 20.2°C | 1 mm | 57% | 3.2 m/s | — |
| 1982 | 28.4°C | 25.5°C | 22.6°C | 31.3°C | 17.3°C | 46 mm | 60% | 4.1 m/s | — |
| 1981 | 27.9°C | 25.2°C | 22.5°C | 31.6°C | 18.0°C | 36 mm | 58% | 3.9 m/s | — |
Actual recorded May data for each year, 1981–2025 — sourced from NASA POWER.
The average high in May is around 27.8°C with lows near 22.2°C (mean 25°C), based on 45 years of NASA POWER data.
May averages 42 mm of rainfall in Onslow, a relatively wet time of year. The wettest on record was 247 mm in 2022.
The hottest May reached 33.7°C in 1990. The coldest dipped to 16.9°C in 2020.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average May temperatures have held steady by about 0°C. Daytime highs moved from 28.2°C to 28.1°C and overnight lows from 22.7°C to 22.7°C over the same span.
May is one of the cooler months of the year in Onslow and a relatively wet time of year, so plan for around 27.8°C daytime highs and 22.2°C at night.
Not quite — May is the 6th coolest month in Onslow, averaging 25°C.
For May in Onslow, pack light layers you can adjust through the day, with typical highs of 27.8°C and lows of 22.2°C.
Relative humidity in May averages 60% — moderately humid.
Average wind speed in May is 3.9 m/s. The windiest May on record averaged 5 m/s (2000).
The wettest May on record was 2022 with 247 mm. On average, May sees 42 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 Onslow 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.
