September is one of the cooler months of the year in Port Augusta, with average highs near 22.9°C and lows around 8.7°C (mean 15.8°C). It is about average for rainfall, averaging 24 mm of rainfall and 56% relative humidity across the period.
September is one of the cooler months of the year in Port Augusta. Across 45 years of records, the warmest September in Port Augusta was 2013 — when the month averaged 18.8°C — while the coldest was 1984 at 12.8°C. Typical September days reach 22.9°C with nights near 8.7°C. The long-term trend is warming, about 0.4°C per decade.
September is about average for rainfall in Port Augusta, averaging 24 mm of rainfall. The wettest September on record was 1992 with 72 mm, while the driest was 2018 at 1 mm.
Relative humidity in Port Augusta during September averages 56%. The most humid September was 2010 at 72%, and the least humid was 2023 at 44%.
September receives about 5.4 kWh/m²/day of solar energy in Port Augusta. The sunniest September was 2023 at 5.9 kWh/m²/day, and the cloudiest was 2010 at 4.6.
Average wind speed in Port Augusta during September is 3.5 m/s. The windiest Septembers were 1996 and 2009 at 4 m/s, while the calmest was 1997 at 2.9 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 | 16.2°C | 16.0°C | 16.8°C | +1.7°C |
| Avg High | 22.1°C | 22.3°C | 23.5°C | 23.1°C | 24.1°C | +2°C |
| Avg Low | 8.1°C | 8.5°C | 9.0°C | 8.8°C | 9.5°C | +1.4°C |
| Avg Rain | 21 mm | 33 mm | 27 mm | 20 mm | 16 mm | -5 mm |
September temperatures in Port Augusta have risen by about 1.7°C between 1981–1985 and 2021–2025.
September has ranged from a record low of 2.2°C (1995) to a record high of 35.8°C (2008).
Rainfall in September is about average for rainfall, averaging 24 mm, with a wettest year of 72 mm.
Daytime highs and overnight lows have shifted differently — highs rose about 0.5°C per decade while lows rose 0.3°C per decade, widening the gap between day and night.
A good time to visit Port Augusta
September is a good time to visit Port Augusta, with days averaging 22.9°C and nights around 8.7°C (mean 15.8°C, cooler than Port Augusta's yearly average) and low rainfall. November and March are marginally more temperate, but September still suits most travellers.
| Year | Avg High | Avg Temp | Avg Low | Hottest Day | Coldest Day | Rainfall | Humidity | Wind | Solar |
|---|---|---|---|---|---|---|---|---|---|
| 2025 | 24.2°C | 16.9°C | 9.6°C | 32.4°C | 6.3°C | 8 mm | 54% | 3.5 m/s | 5.5 |
| 2024 | 23.8°C | 16.1°C | 8.5°C | 32.4°C | 4.2°C | 6 mm | 50% | 3.3 m/s | 5.5 |
| 2023 | 26.7°C | 18.7°C | 10.6°C | 35.6°C | 4.7°C | 2 mm | 44% | 3.1 m/s | 5.9 |
| 2022 | 21.6°C | 15.2°C | 8.8°C | 27.8°C | 4.0°C | 40 mm | 63% | 3.5 m/s | 5 |
| 2021 | 23.7°C | 16.3°C | 9.0°C | 32.2°C | 6.5°C | 6 mm | 51% | 3.5 m/s | 5.6 |
| 2020 | 24.5°C | 17.4°C | 10.4°C | 31.9°C | 5.1°C | 32 mm | 52% | 3.7 m/s | 5.2 |
| 2019 | 24.8°C | 16.9°C | 9.1°C | 32.7°C | 5.3°C | 4 mm | 47% | 3.3 m/s | 5.6 |
| 2018 | 23.0°C | 15.3°C | 7.6°C | 29.8°C | 4.6°C | 1 mm | 47% | 3.1 m/s | 5.7 |
| 2017 | 24.2°C | 16.8°C | 9.4°C | 34.3°C | 5.3°C | 3 mm | 48% | 3.7 m/s | 5.3 |
| 2016 | 20.7°C | 14.2°C | 7.7°C | 27.8°C | 4.7°C | 51 mm | 60% | 3.7 m/s | 5 |
| 2015 | 21.8°C | 14.8°C | 7.9°C | 29.9°C | 5.0°C | 13 mm | 59% | 3.1 m/s | 5.6 |
| 2014 | 23.5°C | 16.3°C | 9.2°C | 32.3°C | 5.5°C | 20 mm | 57% | 3.3 m/s | 5.5 |
| 2013 🔥 | 26.2°C | 18.8°C | 11.5°C | 31.8°C | 6.3°C | 21 mm | 55% | 3.7 m/s | 5.4 |
| 2012 | 23.6°C | 16.1°C | 8.6°C | 33.3°C | 4.6°C | 8 mm | 52% | 3.6 m/s | 5.5 |
| 2011 | 23.7°C | 16.4°C | 9.1°C | 32.4°C | 5.0°C | 18 mm | 52% | 3.7 m/s | 5.7 |
| 2010 | 19.7°C | 13.9°C | 8.1°C | 25.1°C | 4.9°C | 58 mm | 72% | 3.3 m/s | 4.6 |
| 2009 | 23.4°C | 16.4°C | 9.5°C | 33.3°C | 6.5°C | 44 mm | 55% | 4 m/s | 5.2 |
| 2008 | 23.9°C | 16.2°C | 8.6°C | 35.8°C | 4.7°C | 4 mm | 50% | 3.4 m/s | 5.7 |
| 2007 | 24.6°C | 16.8°C | 9.1°C | 34.5°C | 4.3°C | 12 mm | 47% | 3.5 m/s | 5.7 |
| 2006 | 24.6°C | 17.0°C | 9.5°C | 31.7°C | 6.1°C | 3 mm | 47% | 3.5 m/s | 5.7 |
| 2005 | 22.4°C | 15.8°C | 9.2°C | 31.1°C | 4.5°C | 65 mm | 61% | 3.4 m/s | 5.1 |
| 2004 | 22.2°C | 15.4°C | 8.5°C | 32.2°C | 4.3°C | 28 mm | 60% | 3 m/s | 5 |
| 2003 | 23.0°C | 15.7°C | 8.4°C | 32.1°C | 4.6°C | 13 mm | 57% | 3.7 m/s | 5.4 |
| 2002 | 23.0°C | 15.6°C | 8.3°C | 29.9°C | 3.6°C | 14 mm | 54% | 3.8 m/s | 5.4 |
| 2001 | 22.9°C | 16.2°C | 9.4°C | 32.6°C | 4.3°C | 64 mm | 60% | 3.5 m/s | 4.8 |
| 2000 | 24.5°C | 17.2°C | 9.9°C | 33.6°C | 6.0°C | 24 mm | 60% | 3.3 m/s | 5.3 |
| 1999 | 24.8°C | 17.7°C | 10.6°C | 33.9°C | 5.0°C | 15 mm | 53% | 3.6 m/s | 5.1 |
| 1998 | 23.8°C | 16.7°C | 9.5°C | 35.2°C | 5.8°C | 22 mm | 58% | 3.4 m/s | 5.2 |
| 1997 | 21.9°C | 15.6°C | 9.2°C | 26.0°C | 6.8°C | 65 mm | 63% | 2.9 m/s | 4.8 |
| 1996 | 21.8°C | 14.9°C | 8.1°C | 31.4°C | 4.4°C | 51 mm | 60% | 4 m/s | 5.3 |
| 1995 | 22.2°C | 15.2°C | 8.1°C | 28.2°C | 2.2°C | 21 mm | 58% | 3.1 m/s | 5.3 |
| 1994 | 21.6°C | 14.6°C | 7.6°C | 27.9°C | 4.5°C | 10 mm | 58% | 3.3 m/s | 5.7 |
| 1993 | 21.8°C | 15.2°C | 8.6°C | 31.8°C | 4.8°C | 31 mm | 58% | 3.4 m/s | 5.2 |
| 1992 🌧️ | 19.0°C | 12.9°C | 6.8°C | 25.0°C | 3.1°C | 72 mm | 67% | 3.2 m/s | 4.8 |
| 1991 | 23.1°C | 15.8°C | 8.6°C | 30.4°C | 4.7°C | 18 mm | 56% | 3.6 m/s | 5.5 |
| 1990 | 23.1°C | 15.6°C | 8.1°C | 34.5°C | 5.2°C | 22 mm | 57% | 3.5 m/s | 5.6 |
| 1989 | 21.6°C | 14.5°C | 7.4°C | 29.8°C | 3.6°C | 11 mm | 61% | 3.5 m/s | 5.7 |
| 1988 | 23.7°C | 16.4°C | 9.2°C | 32.1°C | 4.8°C | 25 mm | 49% | 3.7 m/s | 5.5 |
| 1987 | 22.8°C | 15.8°C | 8.7°C | 32.9°C | 4.0°C | 27 mm | 58% | 3.2 m/s | 5.2 |
| 1986 | 21.2°C | 14.4°C | 7.6°C | 28.1°C | 3.5°C | 21 mm | 62% | 3.3 m/s | 5.5 |
| 1985 | 19.9°C | 13.5°C | 7.0°C | 27.0°C | 3.4°C | 6 mm | 59% | 3.6 m/s | 5.6 |
| 1984 ❄️ | 19.4°C | 12.8°C | 6.1°C | 26.0°C | 3.2°C | 44 mm | 63% | 3.7 m/s | 5.1 |
| 1983 | 23.2°C | 16.0°C | 8.8°C | 31.1°C | 6.1°C | 26 mm | 58% | 3.6 m/s | — |
| 1982 | 22.2°C | 15.3°C | 8.5°C | 31.9°C | 4.2°C | 16 mm | 51% | 3.3 m/s | — |
| 1981 | 24.7°C | 17.0°C | 9.2°C | 33.6°C | 5.5°C | 13 mm | 53% | 3.3 m/s | — |
Actual recorded September data for each year, 1981–2025 — sourced from NASA POWER.
The average high in September is around 22.9°C with lows near 8.7°C (mean 15.8°C), based on 45 years of NASA POWER data.
September averages 24 mm of rainfall in Port Augusta, about average for rainfall. The wettest on record was 72 mm in 1992.
The hottest September reached 35.8°C in 2008. The coldest dipped to 2.2°C in 1995.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average September temperatures have risen by about 1.7°C. Daytime highs moved from 21.9°C to 24°C and overnight lows from 7.9°C to 9.3°C over the same span.
September is one of the cooler months of the year in Port Augusta and about average for rainfall, so plan for around 22.9°C daytime highs and 8.7°C at night.
Not quite — September is the 5th coolest month in Port Augusta, averaging 15.8°C.
For September in Port Augusta, pack light layers you can adjust through the day, with typical highs of 22.9°C and lows of 8.7°C.
Relative humidity in September averages 56% — moderately humid.
Average wind speed in September is 3.5 m/s. The windiest September on record averaged 4 m/s (1996).
The wettest September on record was 1992 with 72 mm. On average, September sees 24 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 September, 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 September specifically, along with year-by-year records and how the month has changed over the decades.
