September is one of the cooler months of the year in Port Pirie, with average highs near 20.6°C and lows around 7.9°C (mean 14.3°C). It is about average for rainfall, averaging 36 mm of rainfall and 62% relative humidity across the period.
September is one of the cooler months of the year in Port Pirie. Across 45 years of records, the warmest September in Port Pirie was 2023 — when the month averaged 17.8°C — while the coldest was 1992 at 10.9°C. Typical September days reach 20.6°C with nights near 7.9°C. The long-term trend is warming, about 0.5°C per decade.
September is about average for rainfall in Port Pirie, averaging 36 mm of rainfall. The wettest September on record was 2016 with 109 mm, while the driest was 2019 at 6 mm.
Relative humidity in Port Pirie during September averages 62%. The most humid September was 2010 at 77%, and the least humid was 2023 at 47%.
September receives about 4.9 kWh/m²/day of solar energy in Port Pirie. The sunniest September was 2023 at 5.7 kWh/m²/day, and the cloudiest was 2010 at 4.1.
Average wind speed in Port Pirie during September is 3.3 m/s. The windiest September was 1996 at 4 m/s, while the calmest was 1995 at 2.8 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 13.3°C | 13.8°C | 14.7°C | 14.3°C | 15.4°C | +2.1°C |
| Avg High | 19.6°C | 20.0°C | 21.1°C | 20.7°C | 22.1°C | +2.5°C |
| Avg Low | 7.0°C | 7.6°C | 8.3°C | 8.0°C | 8.7°C | +1.7°C |
| Avg Rain | 33 mm | 46 mm | 38 mm | 33 mm | 24 mm | -9 mm |
September temperatures in Port Pirie have risen by about 2.1°C between 1981–1985 and 2021–2025.
September has ranged from a record low of 0.5°C (1995) to a record high of 33.9°C (2023).
Rainfall in September is about average for rainfall, averaging 36 mm, with a wettest year of 109 mm.
A quieter season to visit Port Pirie
If your dates are flexible, the more temperate months of March and December tend to be the most comfortable for visiting Port Pirie. That said, September — with days averaging 20.6°C and nights around 7.9°C (mean 14.3°C) and moderate rainfall (36 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 | 21.9°C | 15.3°C | 8.7°C | 31.0°C | 3.8°C | 15 mm | 59% | 3.4 m/s | 5.3 |
| 2024 | 22.0°C | 14.8°C | 7.7°C | 30.7°C | 3.2°C | 9 mm | 54% | 3.2 m/s | 5.2 |
| 2023 🔥 | 25.3°C | 17.8°C | 10.3°C | 33.9°C | 3.3°C | 6 mm | 47% | 3.1 m/s | 5.7 |
| 2022 | 19.3°C | 13.5°C | 7.6°C | 25.7°C | 2.1°C | 58 mm | 70% | 3.4 m/s | 4.6 |
| 2021 | 21.3°C | 14.7°C | 8.1°C | 30.8°C | 4.7°C | 15 mm | 57% | 3.4 m/s | 5.2 |
| 2020 | 22.7°C | 16.3°C | 9.8°C | 30.5°C | 3.5°C | 41 mm | 55% | 3.7 m/s | 5 |
| 2019 | 22.1°C | 15.1°C | 8.1°C | 30.8°C | 3.3°C | 6 mm | 53% | 3.2 m/s | 5.4 |
| 2018 | 20.5°C | 13.6°C | 6.7°C | 27.3°C | 3.5°C | 7 mm | 53% | 3 m/s | 5.5 |
| 2017 | 21.4°C | 14.8°C | 8.3°C | 31.5°C | 4.0°C | 18 mm | 58% | 3.6 m/s | 5 |
| 2016 🌧️ | 17.9°C | 12.5°C | 7.1°C | 25.4°C | 3.2°C | 109 mm | 70% | 3.6 m/s | 4.3 |
| 2015 | 19.7°C | 13.4°C | 7.2°C | 27.8°C | 3.4°C | 26 mm | 64% | 3 m/s | 5.3 |
| 2014 | 21.0°C | 14.8°C | 8.5°C | 30.3°C | 4.1°C | 27 mm | 62% | 3.3 m/s | 5.2 |
| 2013 | 23.8°C | 17.3°C | 10.8°C | 29.0°C | 5.0°C | 35 mm | 61% | 3.6 m/s | 4.9 |
| 2012 | 21.5°C | 14.7°C | 8.0°C | 31.0°C | 4.4°C | 14 mm | 58% | 3.6 m/s | 5.1 |
| 2011 | 21.6°C | 14.9°C | 8.1°C | 30.6°C | 3.5°C | 22 mm | 57% | 3.6 m/s | 5.2 |
| 2010 | 17.8°C | 12.3°C | 6.9°C | 22.5°C | 2.4°C | 66 mm | 77% | 3 m/s | 4.1 |
| 2009 | 20.9°C | 14.7°C | 8.4°C | 30.6°C | 4.7°C | 80 mm | 61% | 3.9 m/s | 4.7 |
| 2008 | 21.6°C | 14.8°C | 7.9°C | 33.2°C | 2.9°C | 9 mm | 56% | 3.3 m/s | 5.4 |
| 2007 | 22.4°C | 15.5°C | 8.5°C | 33.3°C | 3.9°C | 19 mm | 52% | 3.6 m/s | 5.3 |
| 2006 | 22.5°C | 15.6°C | 8.8°C | 30.3°C | 3.4°C | 8 mm | 52% | 3.5 m/s | 5.4 |
| 2005 | 20.4°C | 14.3°C | 8.2°C | 28.5°C | 3.7°C | 60 mm | 65% | 3.3 m/s | 4.6 |
| 2004 | 20.0°C | 13.8°C | 7.7°C | 29.9°C | 2.4°C | 39 mm | 65% | 2.9 m/s | 4.7 |
| 2003 | 20.3°C | 14.2°C | 8.0°C | 30.0°C | 2.3°C | 19 mm | 63% | 3.6 m/s | 4.9 |
| 2002 | 20.9°C | 14.1°C | 7.3°C | 28.5°C | 3.0°C | 23 mm | 59% | 3.6 m/s | 4.8 |
| 2001 | 20.6°C | 14.7°C | 8.8°C | 30.2°C | 2.8°C | 82 mm | 66% | 3.4 m/s | 4.3 |
| 2000 | 21.3°C | 15.1°C | 8.9°C | 30.5°C | 5.6°C | 46 mm | 68% | 3.2 m/s | 4.8 |
| 1999 | 22.9°C | 16.3°C | 9.8°C | 31.3°C | 3.7°C | 28 mm | 57% | 3.4 m/s | 4.7 |
| 1998 | 21.6°C | 15.2°C | 8.9°C | 33.1°C | 4.3°C | 28 mm | 63% | 3.4 m/s | 4.8 |
| 1997 | 19.8°C | 14.2°C | 8.6°C | 23.5°C | 6.2°C | 85 mm | 67% | 2.9 m/s | 4.4 |
| 1996 | 18.9°C | 13.1°C | 7.3°C | 29.0°C | 3.1°C | 71 mm | 66% | 4 m/s | 4.9 |
| 1995 | 20.4°C | 13.7°C | 7.1°C | 26.8°C | 0.5°C | 25 mm | 62% | 2.8 m/s | 4.8 |
| 1994 | 19.1°C | 12.6°C | 6.1°C | 26.1°C | 1.7°C | 19 mm | 65% | 2.9 m/s | 5.2 |
| 1993 | 20.1°C | 13.7°C | 7.4°C | 29.4°C | 2.5°C | 41 mm | 64% | 3.2 m/s | 4.8 |
| 1992 ❄️ | 16.3°C | 10.9°C | 5.6°C | 21.7°C | 1.9°C | 106 mm | 75% | 3 m/s | 4.5 |
| 1991 | 20.6°C | 14.2°C | 7.8°C | 27.5°C | 3.2°C | 39 mm | 63% | 3.5 m/s | 5 |
| 1990 | 20.7°C | 14.0°C | 7.3°C | 31.8°C | 1.5°C | 20 mm | 63% | 3.4 m/s | 5.1 |
| 1989 | 19.0°C | 12.8°C | 6.6°C | 27.5°C | 2.1°C | 28 mm | 68% | 3.3 m/s | 5.1 |
| 1988 | 21.1°C | 14.8°C | 8.5°C | 29.5°C | 3.6°C | 35 mm | 56% | 3.6 m/s | 5.2 |
| 1987 | 20.6°C | 14.1°C | 7.5°C | 31.0°C | 1.4°C | 34 mm | 63% | 3.1 m/s | 4.9 |
| 1986 | 18.6°C | 12.6°C | 6.6°C | 25.3°C | 1.6°C | 36 mm | 70% | 3.2 m/s | 4.9 |
| 1985 | 17.9°C | 11.9°C | 5.8°C | 24.2°C | 2.0°C | 22 mm | 66% | 3.4 m/s | 4.9 |
| 1984 | 16.8°C | 11.0°C | 5.3°C | 24.0°C | 1.2°C | 57 mm | 70% | 3.5 m/s | 4.7 |
| 1983 | 20.4°C | 13.8°C | 7.3°C | 28.3°C | 3.9°C | 38 mm | 65% | 3.4 m/s | — |
| 1982 | 20.3°C | 13.7°C | 7.2°C | 30.1°C | 2.7°C | 23 mm | 56% | 3.2 m/s | — |
| 1981 | 21.8°C | 15.0°C | 8.3°C | 30.5°C | 4.2°C | 21 mm | 61% | 3.2 m/s | — |
Actual recorded September data for each year, 1981–2025 — sourced from NASA POWER.
The average high in September is around 20.6°C with lows near 7.9°C (mean 14.3°C), based on 45 years of NASA POWER data.
September averages 36 mm of rainfall in Port Pirie, about average for rainfall. The wettest on record was 109 mm in 2016.
The hottest September reached 33.9°C in 2023. The coldest dipped to 0.5°C in 1995.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average September temperatures have risen by about 2.1°C. Daytime highs moved from 19.4°C to 22°C and overnight lows from 6.8°C to 8.5°C over the same span.
September is one of the cooler months of the year in Port Pirie and about average for rainfall, so plan for around 20.6°C daytime highs and 7.9°C at night.
Not quite — September is the 4th coolest month in Port Pirie, averaging 14.3°C.
For September in Port Pirie, pack warm layers and a jacket for chilly mornings, with typical highs of 20.6°C and lows of 7.9°C.
Relative humidity in September averages 62% — moderately humid.
Average wind speed in September is 3.3 m/s. The windiest September on record averaged 4 m/s (1996).
The wettest September on record was 2016 with 109 mm. On average, September sees 36 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 Pirie 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.
