September is one of the cooler months of the year in Port Lincoln, with average highs near 17.7°C and lows around 10.6°C (mean 14.2°C). It is about average for rainfall, averaging 37 mm of rainfall and 71% relative humidity across the period.
September is one of the cooler months of the year in Port Lincoln. Across 45 years of records, the warmest September in Port Lincoln was 2023 — when the month averaged 16.7°C — while the coldest was 1992 at 11.8°C. Typical September days reach 17.7°C with nights near 10.6°C. The long-term trend is warming, about 0.3°C per decade.
September is about average for rainfall in Port Lincoln, averaging 37 mm of rainfall. The wettest September on record was 1992 with 101 mm, while the driest was 2018 at 4 mm.
Relative humidity in Port Lincoln during September averages 71%. The most humid Septembers were 1997 and 2010 at 79%, and the least humid was 2023 at 61%.
September receives about 4.6 kWh/m²/day of solar energy in Port Lincoln. The sunniest September was 2023 at 5.3 kWh/m²/day, and the cloudiest was 2010 at 3.8.
Average wind speed in Port Lincoln during September is 5.4 m/s. The windiest September was 1996 at 6.8 m/s, while the calmest was 1987 at 4.3 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 13.6°C | 13.8°C | 14.4°C | 14.3°C | 14.9°C | +1.3°C |
| Avg High | 17.1°C | 17.3°C | 18.0°C | 17.8°C | 18.6°C | +1.5°C |
| Avg Low | 10.0°C | 10.2°C | 10.7°C | 10.8°C | 11.2°C | +1.2°C |
| Avg Rain | 34 mm | 49 mm | 40 mm | 33 mm | 24 mm | -10 mm |
September temperatures in Port Lincoln have risen by about 1.5°C between 1981–1985 and 2021–2025.
September has ranged from a record low of 6°C (1992) to a record high of 31.4°C (2023).
Rainfall in September is about average for rainfall, averaging 37 mm, with a wettest year of 101 mm.
A quieter season to visit Port Lincoln
If your dates are flexible, the more temperate months of February and January tend to be the most comfortable for visiting Port Lincoln. That said, September — with days averaging 17.7°C and nights around 10.6°C (mean 14.2°C) and moderate rainfall (37 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 | 18.1°C | 14.6°C | 11.1°C | 28.1°C | 8.1°C | 24 mm | 70% | 5.6 m/s | 4.8 |
| 2024 | 18.2°C | 14.7°C | 11.2°C | 25.5°C | 8.0°C | 12 mm | 68% | 5.5 m/s | 4.7 |
| 2023 🔥 | 21.6°C | 16.7°C | 11.9°C | 31.4°C | 9.2°C | 10 mm | 61% | 5.2 m/s | 5.3 |
| 2022 | 16.5°C | 13.7°C | 10.8°C | 23.2°C | 8.8°C | 45 mm | 74% | 5.4 m/s | 4.1 |
| 2021 | 18.5°C | 14.7°C | 10.9°C | 27.0°C | 9.1°C | 9 mm | 68% | 5.6 m/s | 4.9 |
| 2020 | 18.8°C | 15.0°C | 11.2°C | 27.4°C | 7.4°C | 45 mm | 71% | 6.2 m/s | 4.5 |
| 2019 | 18.6°C | 14.6°C | 10.6°C | 27.7°C | 8.1°C | 14 mm | 65% | 4.8 m/s | 4.9 |
| 2018 | 17.6°C | 13.8°C | 10.0°C | 24.8°C | 7.8°C | 4 mm | 66% | 5.4 m/s | 5.1 |
| 2017 | 18.0°C | 14.8°C | 11.5°C | 26.9°C | 10.1°C | 24 mm | 67% | 6 m/s | 4.6 |
| 2016 | 16.4°C | 13.1°C | 9.9°C | 24.9°C | 6.7°C | 35 mm | 70% | 5.5 m/s | 4.3 |
| 2015 | 17.9°C | 14.2°C | 10.5°C | 28.0°C | 7.6°C | 19 mm | 69% | 4.7 m/s | 4.7 |
| 2014 | 18.8°C | 15.0°C | 11.2°C | 28.1°C | 8.6°C | 20 mm | 70% | 5.3 m/s | 4.9 |
| 2013 | 19.1°C | 15.8°C | 12.4°C | 26.0°C | 10.5°C | 57 mm | 75% | 5.6 m/s | 4.4 |
| 2012 | 18.1°C | 14.2°C | 10.2°C | 25.7°C | 7.4°C | 27 mm | 70% | 5.3 m/s | 4.7 |
| 2011 | 18.6°C | 14.8°C | 11.1°C | 24.7°C | 8.6°C | 41 mm | 69% | 5.8 m/s | 4.8 |
| 2010 | 15.1°C | 12.6°C | 10.2°C | 19.4°C | 7.3°C | 87 mm | 79% | 4.8 m/s | 3.8 |
| 2009 | 17.8°C | 14.5°C | 11.1°C | 24.2°C | 8.8°C | 62 mm | 71% | 6 m/s | 4.6 |
| 2008 | 18.6°C | 14.5°C | 10.3°C | 25.0°C | 8.0°C | 18 mm | 69% | 5.4 m/s | 5.1 |
| 2007 | 19.2°C | 14.9°C | 10.6°C | 27.2°C | 7.7°C | 20 mm | 66% | 6 m/s | 4.9 |
| 2006 | 19.2°C | 15.0°C | 10.8°C | 28.4°C | 8.5°C | 11 mm | 66% | 5.3 m/s | 4.8 |
| 2005 | 17.4°C | 14.0°C | 10.6°C | 23.5°C | 7.8°C | 71 mm | 74% | 5.3 m/s | 4.3 |
| 2004 | 16.9°C | 13.6°C | 10.3°C | 28.1°C | 7.7°C | 34 mm | 74% | 4.4 m/s | 4.5 |
| 2003 | 16.5°C | 13.4°C | 10.2°C | 26.6°C | 6.8°C | 59 mm | 74% | 6.5 m/s | 4.5 |
| 2002 | 17.7°C | 14.1°C | 10.5°C | 28.8°C | 7.7°C | 30 mm | 68% | 6.5 m/s | 4.5 |
| 2001 | 18.8°C | 15.1°C | 11.3°C | 28.5°C | 8.4°C | 59 mm | 73% | 5.8 m/s | 4.7 |
| 2000 | 18.0°C | 14.7°C | 11.5°C | 27.1°C | 8.9°C | 37 mm | 75% | 5.9 m/s | 4.5 |
| 1999 | 19.3°C | 15.2°C | 11.2°C | 28.8°C | 8.1°C | 45 mm | 70% | 5.6 m/s | 4.6 |
| 1998 | 18.4°C | 14.5°C | 10.6°C | 27.5°C | 8.2°C | 22 mm | 72% | 5 m/s | 4.6 |
| 1997 | 17.3°C | 14.0°C | 10.8°C | 22.7°C | 8.8°C | 65 mm | 79% | 4.8 m/s | 4.1 |
| 1996 | 16.4°C | 13.2°C | 10.1°C | 23.1°C | 7.2°C | 74 mm | 73% | 6.8 m/s | 4.7 |
| 1995 | 17.4°C | 13.7°C | 10.0°C | 25.8°C | 6.5°C | 44 mm | 73% | 4.8 m/s | 4.2 |
| 1994 | 16.6°C | 13.2°C | 9.8°C | 24.1°C | 7.4°C | 14 mm | 69% | 4.6 m/s | 4.9 |
| 1993 | 17.7°C | 14.1°C | 10.4°C | 25.3°C | 8.1°C | 42 mm | 71% | 4.6 m/s | 4.7 |
| 1992 ❄️ 🌧️ | 14.5°C | 11.8°C | 9.1°C | 20.9°C | 6.0°C | 101 mm | 77% | 5 m/s | 4.3 |
| 1991 | 17.6°C | 13.9°C | 10.1°C | 25.2°C | 7.2°C | 47 mm | 73% | 5.5 m/s | 4.5 |
| 1990 | 17.7°C | 14.1°C | 10.4°C | 28.2°C | 7.9°C | 38 mm | 73% | 5.1 m/s | 4.6 |
| 1989 | 16.6°C | 13.2°C | 9.7°C | 23.9°C | 6.6°C | 42 mm | 74% | 5.4 m/s | 4.8 |
| 1988 | 18.7°C | 14.8°C | 10.9°C | 27.2°C | 8.1°C | 32 mm | 67% | 5.6 m/s | 4.8 |
| 1987 | 17.7°C | 14.0°C | 10.2°C | 29.3°C | 7.7°C | 12 mm | 71% | 4.3 m/s | 4.6 |
| 1986 | 16.4°C | 13.2°C | 10.1°C | 22.4°C | 7.6°C | 41 mm | 75% | 5.6 m/s | 4.6 |
| 1985 | 16.5°C | 13.0°C | 9.6°C | 23.5°C | 8.1°C | 25 mm | 70% | 5.3 m/s | 4.9 |
| 1984 | 14.6°C | 11.9°C | 9.1°C | 21.5°C | 6.9°C | 82 mm | 74% | 5.3 m/s | 4.2 |
| 1983 | 17.4°C | 13.8°C | 10.1°C | 26.8°C | 7.2°C | 44 mm | 75% | 5.7 m/s | — |
| 1982 | 17.1°C | 13.6°C | 10.0°C | 25.4°C | 8.0°C | 19 mm | 67% | 5.1 m/s | — |
| 1981 | 18.8°C | 14.8°C | 10.7°C | 27.7°C | 6.3°C | 12 mm | 71% | 4.9 m/s | — |
Actual recorded September data for each year, 1981–2025 — sourced from NASA POWER.
The average high in September is around 17.7°C with lows near 10.6°C (mean 14.2°C), based on 45 years of NASA POWER data.
September averages 37 mm of rainfall in Port Lincoln, about average for rainfall. The wettest on record was 101 mm in 1992.
The hottest September reached 31.4°C in 2023. The coldest dipped to 6°C in 1992.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average September temperatures have risen by about 1.5°C. Daytime highs moved from 16.9°C to 18.6°C and overnight lows from 9.9°C to 11.2°C over the same span.
September is one of the cooler months of the year in Port Lincoln and about average for rainfall, so plan for around 17.7°C daytime highs and 10.6°C at night.
Not quite — September is the 4th coolest month in Port Lincoln, averaging 14.2°C.
For September in Port Lincoln, pack light layers you can adjust through the day, with typical highs of 17.7°C and lows of 10.6°C.
Relative humidity in September averages 71% — moderately humid.
Average wind speed in September is 5.4 m/s. The windiest September on record averaged 6.8 m/s (1996).
The wettest September on record was 1992 with 101 mm. On average, September sees 37 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 Lincoln 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.
