May is one of the cooler months of the year in Port Denison, with average highs near 23.6°C and lows around 15.3°C (mean 19.5°C). It is a relatively wet time of year, averaging 59 mm of rainfall and 63% relative humidity across the period.
May is one of the cooler months of the year in Port Denison. Across 45 years of records, the warmest May in Port Denison was 2024 — when the month averaged 21.6°C — while the coldest was 1987 at 17.8°C. Typical May days reach 23.6°C with nights near 15.3°C. The long-term trend is warming, about 0.2°C per decade.
May is a relatively wet time of year in Port Denison, averaging 59 mm of rainfall. The wettest May on record was 1999 with 229 mm, while the driest was 2019 at 5 mm.
Relative humidity in Port Denison during May averages 63%. The most humid May was 2014 at 72%, and the least humid was 2018 at 52%.
May receives about 3.6 kWh/m²/day of solar energy in Port Denison. The sunniest Mays were 2018, 2019 and 2025, among others at 3.9 kWh/m²/day, and the cloudiest was 1999 at 2.9.
Average wind speed in Port Denison during May is 4 m/s. The windiest May was 1981 at 4.8 m/s, while the calmest was 2008 at 3.3 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 19.0°C | 19.4°C | 19.6°C | 19.1°C | 20.3°C | +1.3°C |
| Avg High | 23.1°C | 23.3°C | 23.9°C | 23.5°C | 24.7°C | +1.6°C |
| Avg Low | 15.0°C | 15.4°C | 15.4°C | 14.8°C | 15.9°C | +0.9°C |
| Avg Rain | 79 mm | 74 mm | 59 mm | 44 mm | 30 mm | -49 mm |
May temperatures in Port Denison have risen by about 1.2°C between 1981–1985 and 2021–2025.
May has ranged from a record low of 8.8°C (2019) to a record high of 32°C (2025).
Rainfall in May is a relatively wet time of year, averaging 59 mm, with a wettest year of 229 mm.
A good time to visit Port Denison
May is a good time to visit Port Denison, with days averaging 23.6°C and nights around 15.3°C (mean 19.5°C, cooler than Port Denison's yearly average) and moderate rainfall. November and April 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 | 26.2°C | 21.3°C | 16.5°C | 32.0°C | 12.5°C | 23 mm | 57% | 3.9 m/s | 3.9 |
| 2024 🔥 | 25.9°C | 21.6°C | 17.4°C | 28.9°C | 14.4°C | 9 mm | 58% | 3.8 m/s | 3.6 |
| 2023 | 24.5°C | 19.9°C | 15.3°C | 29.0°C | 11.3°C | 31 mm | 54% | 4.3 m/s | 3.6 |
| 2022 | 23.8°C | 19.6°C | 15.4°C | 28.0°C | 10.2°C | 18 mm | 62% | 4 m/s | 3.6 |
| 2021 | 24.2°C | 20.2°C | 16.1°C | 29.6°C | 11.2°C | 73 mm | 63% | 4 m/s | 3.4 |
| 2020 | 23.5°C | 19.2°C | 14.9°C | 28.2°C | 11.0°C | 25 mm | 57% | 4.3 m/s | 3.5 |
| 2019 | 24.0°C | 18.9°C | 13.8°C | 28.0°C | 8.8°C | 5 mm | 58% | 4 m/s | 3.9 |
| 2018 | 25.1°C | 20.3°C | 15.5°C | 31.1°C | 11.6°C | 30 mm | 52% | 4.3 m/s | 3.9 |
| 2017 | 24.0°C | 19.5°C | 15.0°C | 29.8°C | 10.5°C | 20 mm | 63% | 3.7 m/s | 3.9 |
| 2016 | 21.9°C | 17.9°C | 13.8°C | 25.6°C | 10.9°C | 37 mm | 69% | 3.6 m/s | 3.7 |
| 2015 | 23.2°C | 18.6°C | 14.1°C | 26.4°C | 10.7°C | 27 mm | 62% | 4.4 m/s | 3.9 |
| 2014 | 22.0°C | 18.8°C | 15.6°C | 23.9°C | 11.8°C | 74 mm | 72% | 3.4 m/s | 3.2 |
| 2013 | 22.1°C | 18.5°C | 14.9°C | 25.6°C | 9.3°C | 92 mm | 68% | 4 m/s | 3.4 |
| 2012 | 24.9°C | 20.2°C | 15.5°C | 30.2°C | 11.3°C | 16 mm | 60% | 3.8 m/s | 3.7 |
| 2011 | 24.1°C | 19.8°C | 15.5°C | 28.8°C | 11.7°C | 86 mm | 61% | 4.1 m/s | 3.9 |
| 2010 | 23.3°C | 18.8°C | 14.3°C | 29.2°C | 9.5°C | 58 mm | 63% | 3.9 m/s | 3.8 |
| 2009 | 24.8°C | 20.1°C | 15.4°C | 28.5°C | 10.4°C | 47 mm | 54% | 4.1 m/s | 3.9 |
| 2008 | 24.3°C | 20.0°C | 15.8°C | 28.7°C | 11.5°C | 21 mm | 68% | 3.3 m/s | 3.6 |
| 2007 | 22.7°C | 18.4°C | 14.2°C | 28.7°C | 10.3°C | 23 mm | 65% | 3.8 m/s | 3.7 |
| 2006 | 24.3°C | 19.4°C | 14.6°C | 28.2°C | 11.2°C | 23 mm | 61% | 4.2 m/s | 3.7 |
| 2005 | 25.0°C | 21.0°C | 17.0°C | 30.2°C | 13.0°C | 96 mm | 70% | 3.9 m/s | 3.3 |
| 2004 | 22.4°C | 18.5°C | 14.7°C | 28.8°C | 9.6°C | 120 mm | 65% | 4.2 m/s | 3.5 |
| 2003 | 24.7°C | 20.6°C | 16.5°C | 31.1°C | 12.1°C | 80 mm | 64% | 4.1 m/s | 3.5 |
| 2002 | 24.5°C | 20.4°C | 16.3°C | 31.6°C | 12.4°C | 34 mm | 64% | 3.7 m/s | 3.5 |
| 2001 | 23.1°C | 19.4°C | 15.7°C | 27.7°C | 12.0°C | 116 mm | 68% | 3.8 m/s | 3.4 |
| 2000 | 23.3°C | 18.5°C | 13.8°C | 26.9°C | 11.5°C | 29 mm | 56% | 4.3 m/s | 3.9 |
| 1999 🌧️ | 23.8°C | 20.5°C | 17.3°C | 29.0°C | 11.9°C | 229 mm | 70% | 3.9 m/s | 2.9 |
| 1998 | 25.1°C | 21.2°C | 17.2°C | 30.8°C | 13.5°C | 87 mm | 67% | 3.7 m/s | 3.2 |
| 1997 | 22.3°C | 18.9°C | 15.5°C | 27.6°C | 11.6°C | 57 mm | 68% | 4.4 m/s | 3.3 |
| 1996 | 24.7°C | 20.3°C | 15.8°C | 30.5°C | 11.2°C | 36 mm | 57% | 4.1 m/s | 3.7 |
| 1995 | 22.3°C | 18.2°C | 14.1°C | 27.4°C | 10.5°C | 54 mm | 64% | 4.5 m/s | 3.6 |
| 1994 | 24.6°C | 20.4°C | 16.2°C | 30.8°C | 13.3°C | 68 mm | 66% | 3.9 m/s | 3.7 |
| 1993 | 22.7°C | 18.3°C | 13.9°C | 27.0°C | 9.7°C | 74 mm | 66% | 4 m/s | 3.7 |
| 1992 | 21.6°C | 17.9°C | 14.2°C | 24.3°C | 10.4°C | 16 mm | 67% | 3.8 m/s | 3.8 |
| 1991 | 23.4°C | 19.5°C | 15.5°C | 28.8°C | 11.3°C | 37 mm | 65% | 3.8 m/s | 3.3 |
| 1990 | 22.3°C | 18.3°C | 14.3°C | 28.6°C | 10.2°C | 80 mm | 70% | 3.8 m/s | 3.6 |
| 1989 | 24.2°C | 20.0°C | 15.9°C | 28.9°C | 12.1°C | 108 mm | 65% | 4.2 m/s | 3.4 |
| 1988 | 22.1°C | 18.9°C | 15.7°C | 28.0°C | 12.5°C | 110 mm | 71% | 4.1 m/s | 3.3 |
| 1987 ❄️ | 22.5°C | 17.8°C | 13.2°C | 27.8°C | 10.3°C | 52 mm | 63% | 4 m/s | 3.6 |
| 1986 | 21.7°C | 18.0°C | 14.3°C | 25.7°C | 10.9°C | 92 mm | 67% | 3.8 m/s | 3.5 |
| 1985 | 23.9°C | 19.2°C | 14.6°C | 28.7°C | 10.8°C | 27 mm | 57% | 4 m/s | 3.7 |
| 1984 | 22.0°C | 18.9°C | 15.9°C | 27.4°C | 11.7°C | 144 mm | 70% | 4.2 m/s | 3.1 |
| 1983 | 24.5°C | 19.7°C | 14.8°C | 28.5°C | 12.3°C | 21 mm | 63% | 3.6 m/s | — |
| 1982 | 22.7°C | 19.0°C | 15.2°C | 26.4°C | 10.8°C | 37 mm | 66% | 3.7 m/s | — |
| 1981 | 24.1°C | 19.9°C | 15.7°C | 28.8°C | 11.1°C | 117 mm | 58% | 4.8 m/s | — |
Actual recorded May data for each year, 1981–2025 — sourced from NASA POWER.
The average high in May is around 23.6°C with lows near 15.3°C (mean 19.5°C), based on 45 years of NASA POWER data.
May averages 59 mm of rainfall in Port Denison, a relatively wet time of year. The wettest on record was 229 mm in 1999.
The hottest May reached 32°C in 2025. The coldest dipped to 8.8°C in 2019.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average May temperatures have risen by about 1.2°C. Daytime highs moved from 23.4°C to 24.9°C and overnight lows from 15.2°C to 16.1°C over the same span.
May is one of the cooler months of the year in Port Denison and a relatively wet time of year, so plan for around 23.6°C daytime highs and 15.3°C at night.
Not quite — May is the 6th coolest month in Port Denison, averaging 19.5°C.
For May in Port Denison, pack light layers you can adjust through the day, with typical highs of 23.6°C and lows of 15.3°C. Bring an umbrella or light rain jacket too.
Relative humidity in May averages 63% — moderately humid.
Average wind speed in May is 4 m/s. The windiest May on record averaged 4.8 m/s (1981).
The wettest May on record was 1999 with 229 mm. On average, May sees 59 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 Port Denison 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.
