May is one of the cooler months of the year in Port Augusta, with average highs near 21.1°C and lows around 9.6°C (mean 15.4°C). It is about average for rainfall, averaging 20 mm of rainfall and 62% relative humidity across the period.
May is one of the cooler months of the year in Port Augusta. Across 45 years of records, the warmest May in Port Augusta was 2005 — when the month averaged 17.1°C — while the coldest were 2006 and 2020 at 13.6°C. Typical May days reach 21.1°C with nights near 9.6°C. The long-term May temperature trend is broadly flat.
May is about average for rainfall in Port Augusta, averaging 20 mm of rainfall. The wettest May on record was 2010 with 58 mm, while the driest was 1996 at 2 mm.
Relative humidity in Port Augusta during May averages 62%. The most humid May was 1989 at 72%, and the least humid was 2021 at 54%.
May receives about 3.3 kWh/m²/day of solar energy in Port Augusta. The sunniest May was 2025 at 3.8 kWh/m²/day, and the cloudiest were 1988, 1997 and 2011 at 3.
Average wind speed in Port Augusta during May is 2.8 m/s. The windiest May was 2016 at 3.4 m/s, while the calmest was 2009 at 2.2 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 15.1°C | 15.4°C | 15.5°C | 15.4°C | 15.2°C | +0.1°C |
| Avg High | 20.8°C | 21.1°C | 21.3°C | 21.0°C | 21.2°C | +0.4°C |
| Avg Low | 9.5°C | 9.7°C | 9.6°C | 9.8°C | 9.3°C | -0.2°C |
| Avg Rain | 27 mm | 19 mm | 18 mm | 26 mm | 8 mm | -18 mm |
May temperatures in Port Augusta have risen by about 0.4°C between 1981–1985 and 2021–2025.
May has ranged from a record low of 3°C (2006) to a record high of 30.2°C (2002).
Rainfall in May is about average for rainfall, averaging 20 mm, with a wettest year of 58 mm.
A quieter season to visit Port Augusta
If your dates are flexible, the more temperate months of November and March tend to be the most comfortable for visiting Port Augusta. That said, May — with days averaging 21.1°C and nights around 9.6°C (mean 15.4°C) and low rainfall (20 mm) — can still be rewarding for travellers who don't mind the cooler conditions, and often means fewer crowds.
| Year | Avg High | Avg Temp | Avg Low | Hottest Day | Coldest Day | Rainfall | Humidity | Wind | Solar |
|---|---|---|---|---|---|---|---|---|---|
| 2025 | 22.6°C | 16.1°C | 9.7°C | 28.2°C | 4.0°C | 4 mm | 56% | 2.7 m/s | 3.8 |
| 2024 | 22.6°C | 16.0°C | 9.5°C | 25.6°C | 5.4°C | 6 mm | 55% | 2.4 m/s | 3.7 |
| 2023 | 20.4°C | 14.8°C | 9.3°C | 24.4°C | 5.9°C | 11 mm | 66% | 2.4 m/s | 3.3 |
| 2022 | 20.6°C | 14.9°C | 9.3°C | 24.8°C | 5.7°C | 18 mm | 66% | 2.7 m/s | 3.4 |
| 2021 | 21.5°C | 15.7°C | 9.9°C | 28.3°C | 4.3°C | 3 mm | 54% | 2.7 m/s | 3.3 |
| 2020 | 19.4°C | 13.6°C | 7.8°C | 24.1°C | 3.5°C | 7 mm | 63% | 3.2 m/s | 3.6 |
| 2019 | 21.3°C | 15.3°C | 9.3°C | 28.3°C | 6.2°C | 17 mm | 61% | 2.9 m/s | 3.3 |
| 2018 | 21.0°C | 15.4°C | 9.8°C | 27.7°C | 6.0°C | 7 mm | 62% | 2.9 m/s | 3.3 |
| 2017 | 21.4°C | 15.3°C | 9.3°C | 24.8°C | 3.7°C | 4 mm | 55% | 2.7 m/s | 3.5 |
| 2016 | 22.2°C | 16.4°C | 10.6°C | 28.9°C | 8.1°C | 14 mm | 59% | 3.4 m/s | 3.1 |
| 2015 | 20.1°C | 14.6°C | 9.2°C | 28.2°C | 5.9°C | 18 mm | 69% | 2.8 m/s | 3.1 |
| 2014 | 21.5°C | 16.4°C | 11.3°C | 27.1°C | 6.2°C | 43 mm | 67% | 2.6 m/s | 3.1 |
| 2013 | 22.5°C | 17.0°C | 11.4°C | 29.5°C | 6.5°C | 50 mm | 61% | 3.2 m/s | 3.2 |
| 2012 | 20.4°C | 14.3°C | 8.3°C | 28.9°C | 4.4°C | 21 mm | 65% | 2.8 m/s | 3.4 |
| 2011 | 19.2°C | 14.3°C | 9.5°C | 25.2°C | 4.2°C | 23 mm | 68% | 2.8 m/s | 3 |
| 2010 🌧️ | 20.5°C | 15.1°C | 9.7°C | 27.5°C | 5.3°C | 58 mm | 63% | 2.9 m/s | 3.2 |
| 2009 | 20.5°C | 15.0°C | 9.4°C | 23.9°C | 5.3°C | 8 mm | 69% | 2.2 m/s | 3.3 |
| 2008 | 21.5°C | 15.5°C | 9.5°C | 25.4°C | 7.7°C | 17 mm | 60% | 2.3 m/s | 3.5 |
| 2007 | 22.0°C | 16.1°C | 10.2°C | 26.2°C | 5.1°C | 19 mm | 64% | 3.2 m/s | 3.4 |
| 2006 ❄️ | 19.5°C | 13.6°C | 7.6°C | 23.8°C | 3.0°C | 9 mm | 67% | 2.5 m/s | 3.5 |
| 2005 🔥 | 23.1°C | 17.1°C | 11.0°C | 30.1°C | 5.4°C | 6 mm | 55% | 2.7 m/s | 3.4 |
| 2004 | 20.6°C | 14.8°C | 9.0°C | 24.5°C | 4.9°C | 19 mm | 59% | 2.5 m/s | 3.4 |
| 2003 | 21.9°C | 16.0°C | 10.0°C | 27.0°C | 5.5°C | 24 mm | 62% | 2.8 m/s | 3.3 |
| 2002 | 22.5°C | 16.6°C | 10.8°C | 30.2°C | 5.0°C | 31 mm | 55% | 2.8 m/s | 3.2 |
| 2001 | 21.2°C | 15.5°C | 9.8°C | 28.1°C | 4.1°C | 26 mm | 60% | 2.7 m/s | 3.4 |
| 2000 | 19.7°C | 14.3°C | 8.8°C | 25.5°C | 5.0°C | 19 mm | 66% | 3 m/s | 3.4 |
| 1999 | 22.1°C | 16.2°C | 10.3°C | 28.2°C | 6.8°C | 28 mm | 55% | 2.9 m/s | 3.3 |
| 1998 | 21.7°C | 15.8°C | 9.8°C | 26.1°C | 5.8°C | 4 mm | 58% | 2.6 m/s | 3.3 |
| 1997 | 20.7°C | 15.3°C | 9.9°C | 28.9°C | 4.3°C | 17 mm | 63% | 2.5 m/s | 3 |
| 1996 | 21.7°C | 15.7°C | 9.6°C | 28.1°C | 5.2°C | 2 mm | 60% | 2.4 m/s | 3.5 |
| 1995 | 19.5°C | 14.0°C | 8.5°C | 28.0°C | 5.2°C | 23 mm | 67% | 3 m/s | 3.4 |
| 1994 | 21.8°C | 15.8°C | 9.8°C | 28.5°C | 6.0°C | 5 mm | 56% | 3.3 m/s | 3.7 |
| 1993 | 21.7°C | 15.9°C | 10.1°C | 28.2°C | 5.3°C | 21 mm | 60% | 2.5 m/s | 3.3 |
| 1992 | 19.5°C | 14.4°C | 9.3°C | 27.2°C | 3.8°C | 45 mm | 68% | 2.5 m/s | 3.3 |
| 1991 | 21.1°C | 15.1°C | 9.1°C | 24.4°C | 5.8°C | 4 mm | 58% | 2.6 m/s | 3.6 |
| 1990 | 21.5°C | 16.0°C | 10.6°C | 28.7°C | 5.1°C | 43 mm | 64% | 3.1 m/s | 3.3 |
| 1989 | 19.6°C | 14.6°C | 9.5°C | 24.4°C | 6.9°C | 35 mm | 72% | 2.6 m/s | 3.1 |
| 1988 | 21.6°C | 16.4°C | 11.2°C | 29.2°C | 6.2°C | 33 mm | 66% | 3 m/s | 3 |
| 1987 | 19.9°C | 14.5°C | 9.0°C | 25.3°C | 3.6°C | 42 mm | 67% | 3.1 m/s | 3.2 |
| 1986 | 21.1°C | 15.2°C | 9.4°C | 25.8°C | 3.9°C | 23 mm | 62% | 2.8 m/s | 3.5 |
| 1985 | 20.8°C | 14.6°C | 8.5°C | 28.7°C | 3.4°C | 21 mm | 55% | 2.5 m/s | 3.6 |
| 1984 | 20.9°C | 15.3°C | 9.6°C | 27.0°C | 6.5°C | 17 mm | 60% | 2.8 m/s | 3.3 |
| 1983 | 20.9°C | 15.1°C | 9.3°C | 24.8°C | 6.3°C | 19 mm | 65% | 2.8 m/s | — |
| 1982 | 21.3°C | 15.3°C | 9.4°C | 26.9°C | 5.8°C | 10 mm | 58% | 2.8 m/s | — |
| 1981 | 20.8°C | 15.3°C | 9.8°C | 28.8°C | 5.7°C | 40 mm | 60% | 3.3 m/s | — |
Actual recorded May data for each year, 1981–2025 — sourced from NASA POWER.
The average high in May is around 21.1°C with lows near 9.6°C (mean 15.4°C), based on 45 years of NASA POWER data.
May averages 20 mm of rainfall in Port Augusta, about average for rainfall. The wettest on record was 58 mm in 2010.
The hottest May reached 30.2°C in 2002. The coldest dipped to 3°C in 2006.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average May temperatures have risen by about 0.4°C. Daytime highs moved from 20.9°C to 21.5°C and overnight lows from 9.3°C to 9.5°C over the same span.
May is one of the cooler months of the year in Port Augusta and about average for rainfall, so plan for around 21.1°C daytime highs and 9.6°C at night.
Not quite — May is the 4th coolest month in Port Augusta, averaging 15.4°C.
For May in Port Augusta, pack light layers you can adjust through the day, with typical highs of 21.1°C and lows of 9.6°C.
Relative humidity in May averages 62% — moderately humid.
Average wind speed in May is 2.8 m/s. The windiest May on record averaged 3.4 m/s (2016).
The wettest May on record was 2010 with 58 mm. On average, May sees 20 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 Augusta 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.
