May is one of the warmer months of the year in Sidney, with average highs near 14.9°C and lows around 9.1°C (mean 12°C). It is one of the drier months, averaging 55 mm of rainfall and 79% relative humidity across the period.
May is one of the warmer months of the year in Sidney. Across 45 years of records, the warmest Mays in Sidney were 1993, 2019 and 2023 — when the month averaged 13.8°C — while the coldest was 1999 at 9.9°C. Typical May days reach 14.9°C with nights near 9.1°C. The long-term May temperature trend is broadly flat.
May is one of the drier months in Sidney, averaging 55 mm of rainfall. The wettest May on record was 1984 with 110 mm, while the driest was 2018 at 13 mm.
Relative humidity in Sidney during May averages 79%. The most humid May was 2025 at 85%, and the least humid was 1992 at 73%.
May receives about 5.5 kWh/m²/day of solar energy in Sidney. The sunniest May was 1995 at 6.5 kWh/m²/day, and the cloudiest were 1988 and 2022 at 4.7.
Average wind speed in Sidney during May is 2 m/s. The windiest May was 1999 at 2.4 m/s, while the calmest was 2013 at 1.5 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 11.8°C | 12.3°C | 11.7°C | 12.3°C | 11.8°C | 0°C |
| Avg High | 14.8°C | 15.3°C | 14.6°C | 15.3°C | 14.6°C | -0.2°C |
| Avg Low | 8.8°C | 9.4°C | 8.8°C | 9.4°C | 8.9°C | +0.1°C |
| Avg Rain | 64 mm | 54 mm | 52 mm | 51 mm | 58 mm | -6 mm |
May temperatures in Sidney have stayed relatively stable across the record.
May has ranged from a record low of 3.6°C (2009) to a record high of 28.4°C (2005).
Rainfall in May is one of the drier months, averaging 55 mm, with a wettest year of 110 mm.
A good time to visit Sidney
May is a good time to visit Sidney, with days averaging 14.9°C and nights around 9.1°C (mean 12°C, warmer than Sidney's yearly average) and moderate rainfall. August and July 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 | 13.5°C | 10.7°C | 8.0°C | 22.1°C | 6.3°C | 55 mm | 85% | 2 m/s | 5.9 |
| 2024 | 14.0°C | 11.2°C | 8.4°C | 20.5°C | 6.0°C | 62 mm | 84% | 2.3 m/s | 5.6 |
| 2023 | 17.0°C | 13.8°C | 10.5°C | 26.7°C | 7.9°C | 34 mm | 80% | 1.9 m/s | 6.3 |
| 2022 | 12.7°C | 10.3°C | 8.0°C | 17.1°C | 5.7°C | 78 mm | 83% | 2.3 m/s | 4.7 |
| 2021 | 14.7°C | 11.8°C | 8.8°C | 20.2°C | 6.4°C | 37 mm | 80% | 2 m/s | 5.9 |
| 2020 | 15.7°C | 12.7°C | 9.8°C | 24.7°C | 6.5°C | 82 mm | 79% | 2 m/s | 5.6 |
| 2019 | 17.1°C | 13.8°C | 10.5°C | 24.1°C | 7.4°C | 32 mm | 78% | 1.6 m/s | 5.8 |
| 2018 | 16.6°C | 13.4°C | 10.2°C | 22.0°C | 8.4°C | 13 mm | 81% | 1.8 m/s | 6.4 |
| 2017 | 15.3°C | 12.3°C | 9.4°C | 22.2°C | 6.2°C | 64 mm | 80% | 1.7 m/s | 5.6 |
| 2016 | 16.5°C | 13.5°C | 10.5°C | 25.3°C | 8.9°C | 30 mm | 78% | 2.1 m/s | 5.7 |
| 2015 | 16.4°C | 13.4°C | 10.3°C | 21.3°C | 7.3°C | 17 mm | 81% | 1.6 m/s | 5.9 |
| 2014 | 15.8°C | 12.9°C | 10.1°C | 22.2°C | 7.8°C | 65 mm | 81% | 1.7 m/s | 5.5 |
| 2013 | 15.3°C | 12.3°C | 9.4°C | 21.3°C | 5.7°C | 64 mm | 80% | 1.5 m/s | 5.2 |
| 2012 | 13.9°C | 11.0°C | 8.1°C | 19.8°C | 5.2°C | 49 mm | 77% | 1.9 m/s | 5.7 |
| 2011 | 12.5°C | 10.1°C | 7.6°C | 16.1°C | 5.7°C | 88 mm | 82% | 1.9 m/s | 4.9 |
| 2010 | 13.4°C | 10.7°C | 8.0°C | 19.0°C | 4.8°C | 90 mm | 81% | 2.3 m/s | 5.1 |
| 2009 | 14.4°C | 11.2°C | 8.0°C | 19.5°C | 3.6°C | 69 mm | 78% | 2.1 m/s | 5.8 |
| 2008 | 14.7°C | 11.6°C | 8.6°C | 24.7°C | 5.4°C | 39 mm | 80% | 1.8 m/s | 4.9 |
| 2007 | 14.8°C | 11.6°C | 8.4°C | 23.2°C | 5.8°C | 28 mm | 79% | 2 m/s | 5.9 |
| 2006 | 15.1°C | 12.0°C | 9.0°C | 21.4°C | 5.3°C | 50 mm | 77% | 1.9 m/s | 5.7 |
| 2005 | 16.7°C | 13.7°C | 10.7°C | 28.4°C | 8.8°C | 68 mm | 80% | 1.8 m/s | 5.3 |
| 2004 | 15.6°C | 12.8°C | 10.0°C | 20.4°C | 8.1°C | 63 mm | 79% | 1.7 m/s | 5.2 |
| 2003 | 14.1°C | 11.5°C | 8.8°C | 19.1°C | 5.9°C | 38 mm | 80% | 1.9 m/s | 5.3 |
| 2002 | 13.3°C | 10.6°C | 7.9°C | 19.6°C | 4.3°C | 47 mm | 79% | 2 m/s | 5.3 |
| 2001 | 14.0°C | 11.2°C | 8.4°C | 22.4°C | 5.6°C | 43 mm | 77% | 2.1 m/s | 5.6 |
| 2000 | 13.6°C | 11.1°C | 8.6°C | 19.1°C | 6.2°C | 74 mm | 80% | 1.8 m/s | 4.9 |
| 1999 ❄️ | 12.6°C | 9.9°C | 7.2°C | 20.8°C | 4.3°C | 58 mm | 78% | 2.4 m/s | 5.7 |
| 1998 | 14.9°C | 12.3°C | 9.7°C | 21.7°C | 7.8°C | 71 mm | 82% | 2 m/s | 5.1 |
| 1997 | 16.7°C | 13.6°C | 10.5°C | 23.0°C | 5.9°C | 72 mm | 79% | 1.8 m/s | 5.5 |
| 1996 | 13.1°C | 10.6°C | 8.1°C | 17.3°C | 4.3°C | 76 mm | 79% | 2.3 m/s | 5.4 |
| 1995 | 17.0°C | 13.7°C | 10.3°C | 21.9°C | 8.2°C | 27 mm | 76% | 1.9 m/s | 6.5 |
| 1994 | 15.7°C | 12.8°C | 9.8°C | 20.3°C | 6.7°C | 34 mm | 77% | 1.9 m/s | 5.7 |
| 1993 🔥 | 16.9°C | 13.8°C | 10.8°C | 23.5°C | 7.1°C | 94 mm | 79% | 1.8 m/s | 5.3 |
| 1992 | 16.9°C | 13.5°C | 10.2°C | 22.6°C | 6.3°C | 14 mm | 73% | 2.1 m/s | 6.1 |
| 1991 | 14.2°C | 11.4°C | 8.6°C | 17.6°C | 6.8°C | 39 mm | 81% | 2.2 m/s | 5 |
| 1990 | 14.6°C | 11.9°C | 9.1°C | 18.0°C | 6.7°C | 54 mm | 80% | 2.3 m/s | 5.3 |
| 1989 | 15.0°C | 12.0°C | 8.9°C | 19.3°C | 6.3°C | 58 mm | 79% | 2.3 m/s | 5.4 |
| 1988 | 14.6°C | 11.6°C | 8.6°C | 22.5°C | 5.0°C | 89 mm | 78% | 1.7 m/s | 4.7 |
| 1987 | 15.5°C | 12.2°C | 9.0°C | 21.0°C | 7.2°C | 59 mm | 78% | 2.1 m/s | 6 |
| 1986 | 14.3°C | 11.4°C | 8.5°C | 23.5°C | 6.0°C | 91 mm | 81% | 2.1 m/s | 5 |
| 1985 | 14.8°C | 11.7°C | 8.5°C | 23.5°C | 5.0°C | 44 mm | 77% | 2 m/s | 5.4 |
| 1984 🌧️ | 13.0°C | 10.4°C | 7.8°C | 21.5°C | 6.0°C | 110 mm | 79% | 2.3 m/s | 5.1 |
| 1983 | 16.6°C | 13.3°C | 10.1°C | 27.6°C | 6.3°C | 48 mm | 76% | 2 m/s | — |
| 1982 | 15.0°C | 11.7°C | 8.4°C | 21.7°C | 5.2°C | 19 mm | 75% | 2.2 m/s | — |
| 1981 | 14.6°C | 11.8°C | 9.0°C | 20.7°C | 5.9°C | 59 mm | 79% | 2 m/s | — |
Actual recorded May data for each year, 1981–2025 — sourced from NASA POWER.
The average high in May is around 14.9°C with lows near 9.1°C (mean 12°C), based on 45 years of NASA POWER data.
May averages 55 mm of rainfall in Sidney, one of the drier months. The wettest on record was 110 mm in 1984.
The hottest May reached 28.4°C in 2005. The coldest dipped to 3.6°C in 2009.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average May temperatures have fallen by about 0.2°C. Daytime highs moved from 14.8°C to 14.4°C and overnight lows from 8.8°C to 8.7°C over the same span.
May is one of the warmer months of the year in Sidney and one of the drier months, so plan for around 14.9°C daytime highs and 9.1°C at night.
Not quite — May is the 8th coolest month in Sidney, averaging 12°C.
For May in Sidney, pack light layers you can adjust through the day, with typical highs of 14.9°C and lows of 9.1°C. Bring an umbrella or light rain jacket too.
Relative humidity in May averages 79% — quite humid.
Average wind speed in May is 2 m/s. The windiest May on record averaged 2.4 m/s (1999).
The wettest May on record was 1984 with 110 mm. On average, May sees 55 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 Sidney 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.
