May is one of the cooler months of the year in Southern Cross, with average highs near 21.7°C and lows around 8.8°C (mean 15.3°C). It is about average for rainfall, averaging 33 mm of rainfall and 59% relative humidity across the period.
May is one of the cooler months of the year in Southern Cross. Across 45 years of records, the warmest May in Southern Cross was 1998 — when the month averaged 17.9°C — while the coldest was 1995 at 13°C. Typical May days reach 21.7°C with nights near 8.8°C. The long-term trend is warming, about 0.2°C per decade.
May is about average for rainfall in Southern Cross, averaging 33 mm of rainfall. The wettest Mays on record were 1984 and 1999 with 103 mm, while the driest was 1983 at 3 mm.
Relative humidity in Southern Cross during May averages 59%. The most humid May was 1999 at 72%, and the least humid was 2024 at 48%.
May receives about 3.4 kWh/m²/day of solar energy in Southern Cross. The sunniest May was 2019 at 3.9 kWh/m²/day, and the cloudiest were 1997 and 1999 at 2.9.
Average wind speed in Southern Cross during May is 2.9 m/s. The windiest May was 1981 at 3.6 m/s, while the calmest was 2008 at 2.4 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 14.7°C | 15.3°C | 15.5°C | 15.0°C | 16.1°C | +1.4°C |
| Avg High | 21.1°C | 21.5°C | 22.1°C | 21.5°C | 22.9°C | +1.8°C |
| Avg Low | 8.4°C | 9.2°C | 8.9°C | 8.4°C | 9.2°C | +0.8°C |
| Avg Rain | 53 mm | 37 mm | 29 mm | 23 mm | 16 mm | -37 mm |
May temperatures in Southern Cross have risen by about 1.5°C between 1981–1985 and 2021–2025.
May has ranged from a record low of 2.2°C (2006) to a record high of 33.1°C (2002).
Rainfall in May is about average for rainfall, averaging 33 mm, with a wettest year of 103 mm.
A good time to visit Southern Cross
May is a good time to visit Southern Cross, with days averaging 21.7°C and nights around 8.8°C (mean 15.3°C, cooler than Southern Cross's yearly average) and moderate rainfall. November and March 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 | 23.8°C | 16.6°C | 9.4°C | 30.4°C | 2.8°C | 6 mm | 55% | 2.9 m/s | 3.8 |
| 2024 | 24.5°C | 17.6°C | 10.7°C | 29.5°C | 5.2°C | 6 mm | 48% | 2.8 m/s | 3.5 |
| 2023 | 22.9°C | 15.8°C | 8.7°C | 27.9°C | 3.2°C | 6 mm | 50% | 2.9 m/s | 3.6 |
| 2022 | 22.4°C | 15.8°C | 9.2°C | 27.8°C | 3.7°C | 17 mm | 55% | 3 m/s | 3.5 |
| 2021 | 22.2°C | 16.0°C | 9.8°C | 27.7°C | 3.1°C | 38 mm | 57% | 3 m/s | 3.4 |
| 2020 | 21.6°C | 14.6°C | 7.6°C | 29.7°C | 4.1°C | 21 mm | 54% | 3.3 m/s | 3.6 |
| 2019 | 21.7°C | 14.4°C | 7.1°C | 30.6°C | 3.0°C | 6 mm | 53% | 2.6 m/s | 3.9 |
| 2018 | 22.9°C | 15.8°C | 8.6°C | 27.6°C | 4.3°C | 11 mm | 48% | 3.3 m/s | 3.8 |
| 2017 | 21.7°C | 15.2°C | 8.8°C | 28.3°C | 3.9°C | 15 mm | 63% | 2.7 m/s | 3.4 |
| 2016 | 20.3°C | 13.7°C | 7.1°C | 26.7°C | 3.3°C | 31 mm | 66% | 2.5 m/s | 3.5 |
| 2015 | 20.4°C | 14.0°C | 7.5°C | 25.4°C | 4.0°C | 11 mm | 61% | 2.9 m/s | 3.7 |
| 2014 | 20.5°C | 15.1°C | 9.6°C | 24.0°C | 4.5°C | 42 mm | 70% | 2.5 m/s | 3.1 |
| 2013 | 21.4°C | 15.5°C | 9.5°C | 31.3°C | 4.5°C | 30 mm | 64% | 3 m/s | 3.3 |
| 2012 | 22.8°C | 15.8°C | 8.7°C | 28.3°C | 3.9°C | 16 mm | 57% | 2.6 m/s | 3.6 |
| 2011 | 21.5°C | 15.2°C | 8.9°C | 26.1°C | 5.3°C | 29 mm | 62% | 2.9 m/s | 3.3 |
| 2010 | 22.0°C | 14.9°C | 7.9°C | 28.7°C | 4.2°C | 40 mm | 56% | 3 m/s | 3.6 |
| 2009 | 21.6°C | 14.9°C | 8.2°C | 26.2°C | 2.9°C | 25 mm | 55% | 2.9 m/s | 3.7 |
| 2008 | 23.7°C | 16.7°C | 9.7°C | 29.3°C | 4.7°C | 14 mm | 57% | 2.4 m/s | 3.6 |
| 2007 | 20.9°C | 14.1°C | 7.3°C | 26.7°C | 2.4°C | 13 mm | 61% | 2.6 m/s | 3.5 |
| 2006 | 21.5°C | 14.6°C | 7.8°C | 25.2°C | 2.2°C | 17 mm | 60% | 2.7 m/s | 3.5 |
| 2005 | 23.5°C | 17.7°C | 11.8°C | 29.8°C | 6.8°C | 72 mm | 64% | 3 m/s | 3 |
| 2004 | 20.6°C | 14.3°C | 7.9°C | 29.3°C | 3.3°C | 43 mm | 60% | 2.8 m/s | 3.4 |
| 2003 | 22.4°C | 16.0°C | 9.5°C | 28.4°C | 3.4°C | 61 mm | 58% | 3.3 m/s | 3.3 |
| 2002 | 24.4°C | 17.4°C | 10.4°C | 33.1°C | 4.6°C | 6 mm | 53% | 2.8 m/s | 3.4 |
| 2001 | 22.2°C | 16.0°C | 9.8°C | 30.5°C | 5.3°C | 35 mm | 61% | 2.9 m/s | 3.3 |
| 2000 | 20.0°C | 13.2°C | 6.3°C | 25.3°C | 4.1°C | 4 mm | 62% | 2.5 m/s | 3.7 |
| 1999 | 21.0°C | 15.4°C | 9.9°C | 28.1°C | 2.9°C | 103 mm | 72% | 2.8 m/s | 2.9 |
| 1998 🔥 | 24.0°C | 17.9°C | 11.7°C | 29.6°C | 5.8°C | 43 mm | 61% | 3 m/s | 3.2 |
| 1997 | 19.6°C | 14.3°C | 9.1°C | 26.9°C | 4.1°C | 35 mm | 69% | 3.3 m/s | 2.9 |
| 1996 | 22.9°C | 16.0°C | 9.1°C | 28.2°C | 4.8°C | 14 mm | 53% | 2.9 m/s | 3.5 |
| 1995 ❄️ | 19.2°C | 13.0°C | 6.8°C | 24.4°C | 3.2°C | 41 mm | 67% | 3.2 m/s | 3.4 |
| 1994 | 23.5°C | 16.7°C | 9.9°C | 29.4°C | 7.0°C | 34 mm | 53% | 3.1 m/s | 3.6 |
| 1993 | 20.5°C | 14.2°C | 7.9°C | 24.8°C | 2.4°C | 47 mm | 61% | 2.9 m/s | 3.4 |
| 1992 | 19.6°C | 13.9°C | 8.2°C | 23.9°C | 3.5°C | 10 mm | 68% | 2.7 m/s | 3.5 |
| 1991 | 22.2°C | 16.0°C | 9.7°C | 29.3°C | 5.8°C | 31 mm | 55% | 3.2 m/s | 3.4 |
| 1990 | 22.0°C | 15.8°C | 9.5°C | 31.8°C | 3.5°C | 15 mm | 62% | 2.6 m/s | 3.4 |
| 1989 | 21.2°C | 15.1°C | 9.0°C | 27.1°C | 5.5°C | 85 mm | 62% | 2.9 m/s | 3.1 |
| 1988 | 20.5°C | 14.8°C | 9.1°C | 25.4°C | 4.7°C | 83 mm | 71% | 3.1 m/s | 3 |
| 1987 | 20.3°C | 13.4°C | 6.6°C | 27.2°C | 3.3°C | 26 mm | 58% | 2.8 m/s | 3.4 |
| 1986 | 20.8°C | 14.5°C | 8.3°C | 25.0°C | 5.6°C | 47 mm | 61% | 3.1 m/s | 3.4 |
| 1985 | 21.5°C | 14.6°C | 7.7°C | 31.0°C | 3.3°C | 18 mm | 50% | 3 m/s | 3.6 |
| 1984 🌧️ | 19.7°C | 14.3°C | 8.9°C | 23.3°C | 4.8°C | 103 mm | 72% | 3.3 m/s | 3.3 |
| 1983 | 23.8°C | 16.2°C | 8.7°C | 31.9°C | 4.4°C | 3 mm | 48% | 2.8 m/s | — |
| 1982 | 21.0°C | 14.8°C | 8.5°C | 27.7°C | 3.5°C | 47 mm | 63% | 2.7 m/s | — |
| 1981 | 20.8°C | 14.7°C | 8.6°C | 29.5°C | 4.3°C | 64 mm | 56% | 3.6 m/s | — |
Actual recorded May data for each year, 1981–2025 — sourced from NASA POWER.
The average high in May is around 21.7°C with lows near 8.8°C (mean 15.3°C), based on 45 years of NASA POWER data.
May averages 33 mm of rainfall in Southern Cross, about average for rainfall. The wettest on record was 103 mm in 1984.
The hottest May reached 33.1°C in 2002. The coldest dipped to 2.2°C in 2006.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average May temperatures have risen by about 1.5°C. Daytime highs moved from 21.4°C to 23.2°C and overnight lows from 8.5°C to 9.6°C over the same span.
May is one of the cooler months of the year in Southern Cross and about average for rainfall, so plan for around 21.7°C daytime highs and 8.8°C at night.
Not quite — May is the 5th coolest month in Southern Cross, averaging 15.3°C.
For May in Southern Cross, pack light layers you can adjust through the day, with typical highs of 21.7°C and lows of 8.8°C.
Relative humidity in May averages 59% — moderately humid.
Average wind speed in May is 2.9 m/s. The windiest May on record averaged 3.6 m/s (1981).
The wettest May on record was 1984 with 103 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 Southern Cross 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.
