May is one of the cooler months of the year in Sunbury, with average highs near 15.7°C and lows around 6.5°C (mean 11.1°C). It is about average for rainfall, averaging 58 mm of rainfall and 82% relative humidity across the period.
May is one of the cooler months of the year in Sunbury. Across 45 years of records, the warmest May in Sunbury was 2007 — when the month averaged 12.7°C — while the coldest was 2020 at 9.3°C. Typical May days reach 15.7°C with nights near 6.5°C. The long-term May temperature trend is broadly flat.
May is about average for rainfall in Sunbury, averaging 58 mm of rainfall. The wettest May on record was 2000 with 116 mm, while the driest were 2005 and 2025 at 15 mm.
Relative humidity in Sunbury during May averages 82%. The most humid May was 1989 at 89%, and the least humid was 2025 at 73%.
May receives about 2.4 kWh/m²/day of solar energy in Sunbury. The sunniest May was 2025 at 2.9 kWh/m²/day, and the cloudiest was 1988 at 2.
Average wind speed in Sunbury during May is 1.9 m/s. The windiest May was 2016 at 2.7 m/s, while the calmest were 1991 and 2024 at 1.4 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 11.0°C | 10.9°C | 11.3°C | 11.2°C | 11.0°C | 0°C |
| Avg High | 15.5°C | 15.4°C | 16.0°C | 15.7°C | 15.8°C | +0.3°C |
| Avg Low | 6.5°C | 6.3°C | 6.6°C | 6.7°C | 6.1°C | -0.4°C |
| Avg Rain | 82 mm | 56 mm | 50 mm | 60 mm | 39 mm | -43 mm |
May temperatures in Sunbury have risen by about 0.6°C between 1981–1985 and 2021–2025.
May has ranged from a record low of 0.3°C (2016) to a record high of 25.8°C (1988).
Rainfall in May is about average for rainfall, averaging 58 mm, with a wettest year of 116 mm.
Daytime highs and overnight lows have shifted differently — highs rose about 0.2°C per decade while lows rose 0°C per decade, widening the gap between day and night.
A good time to visit Sunbury
May is a good time to visit Sunbury, with days averaging 15.7°C and nights around 6.5°C (mean 11.1°C, cooler than Sunbury'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 | 17.9°C | 12.3°C | 6.7°C | 24.1°C | 0.6°C | 15 mm | 73% | 1.9 m/s | 2.9 |
| 2024 | 16.9°C | 11.7°C | 6.4°C | 20.4°C | 3.1°C | 40 mm | 81% | 1.4 m/s | 2.6 |
| 2023 | 14.6°C | 10.1°C | 5.7°C | 19.6°C | 2.6°C | 50 mm | 83% | 2 m/s | 2.3 |
| 2022 | 15.6°C | 11.1°C | 6.6°C | 19.9°C | 2.8°C | 28 mm | 84% | 1.6 m/s | 2.2 |
| 2021 | 16.3°C | 11.2°C | 6.0°C | 23.2°C | 0.6°C | 58 mm | 79% | 2 m/s | 2.5 |
| 2020 ❄️ | 13.4°C | 9.3°C | 5.2°C | 17.5°C | 1.8°C | 44 mm | 87% | 2.3 m/s | 2.5 |
| 2019 | 16.3°C | 11.7°C | 7.2°C | 21.0°C | 2.8°C | 69 mm | 79% | 2.3 m/s | 2.3 |
| 2018 | 16.3°C | 11.7°C | 7.1°C | 25.2°C | 3.5°C | 54 mm | 78% | 2.3 m/s | 2.2 |
| 2017 | 15.8°C | 11.1°C | 6.5°C | 21.1°C | 2.8°C | 27 mm | 81% | 1.8 m/s | 2.4 |
| 2016 | 16.5°C | 11.8°C | 7.2°C | 23.4°C | 0.3°C | 61 mm | 78% | 2.7 m/s | 2.3 |
| 2015 | 15.2°C | 10.7°C | 6.2°C | 21.0°C | 2.2°C | 67 mm | 82% | 2.5 m/s | 2.4 |
| 2014 | 16.6°C | 12.1°C | 7.7°C | 21.4°C | 0.6°C | 56 mm | 84% | 2 m/s | 2.3 |
| 2013 | 16.1°C | 11.3°C | 6.5°C | 24.1°C | 3.6°C | 53 mm | 79% | 2.1 m/s | 2.4 |
| 2012 | 14.5°C | 10.3°C | 6.2°C | 19.9°C | 1.9°C | 92 mm | 83% | 2.1 m/s | 2.3 |
| 2011 | 13.7°C | 9.7°C | 5.7°C | 18.8°C | 2.9°C | 65 mm | 86% | 1.8 m/s | 2.1 |
| 2010 | 16.2°C | 11.5°C | 6.9°C | 20.6°C | 1.1°C | 52 mm | 84% | 1.7 m/s | 2.4 |
| 2009 | 16.5°C | 11.7°C | 6.9°C | 20.9°C | 3.7°C | 21 mm | 82% | 1.7 m/s | 2.4 |
| 2008 | 15.7°C | 10.8°C | 6.0°C | 20.0°C | 2.3°C | 45 mm | 83% | 1.6 m/s | 2.3 |
| 2007 🔥 | 17.1°C | 12.7°C | 8.2°C | 21.1°C | 4.0°C | 87 mm | 81% | 2.5 m/s | 2.4 |
| 2006 | 14.8°C | 10.3°C | 5.8°C | 19.4°C | 2.8°C | 50 mm | 85% | 1.9 m/s | 2.3 |
| 2005 | 17.5°C | 12.1°C | 6.8°C | 22.4°C | 3.4°C | 15 mm | 75% | 1.8 m/s | 2.7 |
| 2004 | 15.1°C | 10.2°C | 5.3°C | 19.3°C | 1.6°C | 46 mm | 82% | 2.1 m/s | 2.4 |
| 2003 | 17.0°C | 11.9°C | 6.8°C | 22.7°C | 2.2°C | 46 mm | 79% | 1.6 m/s | 2.6 |
| 2002 | 17.0°C | 12.1°C | 7.2°C | 25.7°C | 3.4°C | 52 mm | 77% | 1.8 m/s | 2.5 |
| 2001 | 15.1°C | 10.9°C | 6.7°C | 21.0°C | 4.5°C | 24 mm | 86% | 1.5 m/s | 2.3 |
| 2000 🌧️ | 14.5°C | 10.4°C | 6.2°C | 20.1°C | 1.9°C | 116 mm | 84% | 2.3 m/s | 2.2 |
| 1999 | 16.4°C | 11.3°C | 6.1°C | 21.8°C | 0.7°C | 76 mm | 77% | 2.2 m/s | 2.3 |
| 1998 | 15.6°C | 11.1°C | 6.6°C | 21.2°C | 1.7°C | 43 mm | 83% | 1.9 m/s | 2.3 |
| 1997 | 15.3°C | 10.9°C | 6.6°C | 25.0°C | 1.2°C | 83 mm | 82% | 1.8 m/s | 2.1 |
| 1996 | 15.2°C | 10.6°C | 5.9°C | 22.0°C | 1.7°C | 36 mm | 85% | 1.6 m/s | 2.2 |
| 1995 | 14.0°C | 10.2°C | 6.4°C | 19.0°C | 2.6°C | 83 mm | 88% | 1.8 m/s | 2.3 |
| 1994 | 15.0°C | 10.5°C | 6.0°C | 21.2°C | 1.5°C | 47 mm | 78% | 2.6 m/s | 2.3 |
| 1993 | 16.0°C | 11.2°C | 6.4°C | 23.0°C | 2.2°C | 45 mm | 80% | 1.8 m/s | 2.4 |
| 1992 | 14.5°C | 10.5°C | 6.4°C | 20.6°C | 1.2°C | 95 mm | 87% | 1.7 m/s | 2.3 |
| 1991 | 16.3°C | 11.3°C | 6.3°C | 21.3°C | 2.9°C | 20 mm | 80% | 1.4 m/s | 2.5 |
| 1990 | 15.7°C | 10.9°C | 6.2°C | 22.3°C | 3.1°C | 29 mm | 81% | 2 m/s | 2.5 |
| 1989 | 15.6°C | 11.6°C | 7.5°C | 19.9°C | 2.0°C | 84 mm | 89% | 1.8 m/s | 2.3 |
| 1988 | 16.5°C | 12.5°C | 8.6°C | 25.8°C | 3.0°C | 102 mm | 86% | 1.7 m/s | 2 |
| 1987 | 15.1°C | 10.7°C | 6.3°C | 21.4°C | 0.7°C | 96 mm | 84% | 2.1 m/s | 2.1 |
| 1986 | 14.8°C | 10.5°C | 6.1°C | 19.3°C | 2.0°C | 91 mm | 86% | 1.7 m/s | 2.3 |
| 1985 | 15.8°C | 11.0°C | 6.2°C | 24.2°C | 0.4°C | 72 mm | 81% | 1.8 m/s | 2.5 |
| 1984 | 15.8°C | 10.7°C | 5.6°C | 21.2°C | 2.0°C | 25 mm | 79% | 1.7 m/s | 2.6 |
| 1983 | 14.9°C | 10.8°C | 6.7°C | 18.5°C | 1.5°C | 104 mm | 88% | 1.9 m/s | — |
| 1982 | 15.1°C | 10.1°C | 5.1°C | 20.1°C | 2.4°C | 59 mm | 79% | 2.2 m/s | — |
| 1981 | 15.5°C | 10.7°C | 6.0°C | 23.0°C | 1.3°C | 104 mm | 81% | 1.9 m/s | — |
Actual recorded May data for each year, 1981–2025 — sourced from NASA POWER.
The average high in May is around 15.7°C with lows near 6.5°C (mean 11.1°C), based on 45 years of NASA POWER data.
May averages 58 mm of rainfall in Sunbury, about average for rainfall. The wettest on record was 116 mm in 2000.
The hottest May reached 25.8°C in 1988. The coldest dipped to 0.3°C in 2016.
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 15.4°C to 16.3°C and overnight lows from 5.9°C to 6.3°C over the same span.
May is one of the cooler months of the year in Sunbury and about average for rainfall, so plan for around 15.7°C daytime highs and 6.5°C at night.
Not quite — May is the 5th coolest month in Sunbury, averaging 11.1°C.
For May in Sunbury, pack warm layers and a jacket for chilly mornings, with typical highs of 15.7°C and lows of 6.5°C. Bring an umbrella or light rain jacket too.
Relative humidity in May averages 82% — quite humid.
Average wind speed in May is 1.9 m/s. The windiest May on record averaged 2.7 m/s (2016).
The wettest May on record was 2000 with 116 mm. On average, May sees 58 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 Sunbury 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.
