September is one of the cooler months of the year in Ceduna, with average highs near 22.6°C and lows around 9.5°C (mean 16.1°C). It is about average for rainfall, averaging 23 mm of rainfall and 61% relative humidity across the period.
September is one of the cooler months of the year in Ceduna. Across 45 years of records, the warmest September in Ceduna was 2023 — when the month averaged 19.3°C — while the coldest was 1984 at 13°C. Typical September days reach 22.6°C with nights near 9.5°C. The long-term trend is warming, about 0.4°C per decade.
September is about average for rainfall in Ceduna, averaging 23 mm of rainfall. The wettest September on record was 1997 with 75 mm, while the driest was 2018 at 1 mm.
Relative humidity in Ceduna during September averages 61%. The most humid September was 2010 at 75%, and the least humid was 2023 at 48%.
September receives about 5.2 kWh/m²/day of solar energy in Ceduna. The sunniest Septembers were 2008 and 2018 at 5.7 kWh/m²/day, and the cloudiest was 2010 at 4.5.
Average wind speed in Ceduna during September is 3.7 m/s. The windiest September was 1996 at 4.4 m/s, while the calmest were 1987 and 2004 at 3.3 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 15.5°C | 15.7°C | 16.3°C | 16.2°C | 16.8°C | +1.3°C |
| Avg High | 22.0°C | 21.9°C | 22.9°C | 22.8°C | 23.6°C | +1.6°C |
| Avg Low | 8.9°C | 9.5°C | 9.7°C | 9.7°C | 10.1°C | +1.2°C |
| Avg Rain | 20 mm | 38 mm | 27 mm | 13 mm | 9 mm | -11 mm |
September temperatures in Ceduna have risen by about 1.3°C between 1981–1985 and 2021–2025.
September has ranged from a record low of 3.5°C (1986) to a record high of 38.3°C (2023).
Rainfall in September is about average for rainfall, averaging 23 mm, with a wettest year of 75 mm.
A good time to visit Ceduna
September is a good time to visit Ceduna, with days averaging 22.6°C and nights around 9.5°C (mean 16.1°C, cooler than Ceduna's yearly average) and low rainfall. March and December 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 | 23.0°C | 16.5°C | 10.0°C | 34.1°C | 6.5°C | 2 mm | 59% | 3.6 m/s | 5.4 |
| 2024 | 23.3°C | 16.4°C | 9.5°C | 34.3°C | 5.2°C | 2 mm | 56% | 3.7 m/s | 5.2 |
| 2023 🔥 | 27.2°C | 19.3°C | 11.4°C | 38.3°C | 4.1°C | 2 mm | 48% | 3.8 m/s | 5.6 |
| 2022 | 21.0°C | 15.0°C | 8.9°C | 28.6°C | 4.4°C | 31 mm | 65% | 4 m/s | 4.9 |
| 2021 | 23.1°C | 16.5°C | 9.9°C | 32.0°C | 6.1°C | 2 mm | 56% | 4 m/s | 5.4 |
| 2020 | 23.8°C | 17.3°C | 10.8°C | 34.7°C | 6.3°C | 14 mm | 60% | 4 m/s | 4.9 |
| 2019 | 25.1°C | 17.6°C | 10.2°C | 34.5°C | 5.7°C | 3 mm | 51% | 3.5 m/s | 5.4 |
| 2018 | 22.9°C | 15.9°C | 9.0°C | 30.7°C | 4.7°C | 1 mm | 51% | 3.6 m/s | 5.7 |
| 2017 | 23.3°C | 17.0°C | 10.6°C | 33.4°C | 5.8°C | 3 mm | 56% | 3.7 m/s | 5.1 |
| 2016 | 20.0°C | 14.3°C | 8.5°C | 29.3°C | 5.5°C | 13 mm | 61% | 4 m/s | 5 |
| 2015 | 22.5°C | 15.7°C | 8.9°C | 32.9°C | 5.9°C | 10 mm | 60% | 3.5 m/s | 5.5 |
| 2014 | 23.2°C | 16.5°C | 9.8°C | 33.0°C | 5.5°C | 10 mm | 60% | 3.6 m/s | 5.4 |
| 2013 | 25.4°C | 18.4°C | 11.4°C | 33.3°C | 7.2°C | 11 mm | 61% | 3.9 m/s | 5.2 |
| 2012 | 23.6°C | 16.5°C | 9.4°C | 31.3°C | 4.6°C | 11 mm | 56% | 3.9 m/s | 5.4 |
| 2011 | 22.9°C | 16.4°C | 9.9°C | 31.7°C | 6.4°C | 32 mm | 60% | 3.9 m/s | 5.4 |
| 2010 | 18.9°C | 13.9°C | 8.9°C | 25.1°C | 5.6°C | 38 mm | 75% | 3.5 m/s | 4.5 |
| 2009 | 22.4°C | 16.2°C | 10.0°C | 30.0°C | 6.2°C | 38 mm | 62% | 4.1 m/s | 5.2 |
| 2008 | 24.0°C | 16.7°C | 9.4°C | 34.2°C | 5.2°C | 6 mm | 57% | 3.7 m/s | 5.7 |
| 2007 | 24.4°C | 17.1°C | 9.7°C | 32.9°C | 4.7°C | 6 mm | 53% | 3.8 m/s | 5.4 |
| 2006 | 24.4°C | 17.4°C | 10.3°C | 33.3°C | 5.4°C | 2 mm | 53% | 3.8 m/s | 5.2 |
| 2005 | 21.6°C | 15.5°C | 9.3°C | 29.0°C | 5.0°C | 74 mm | 65% | 3.7 m/s | 4.8 |
| 2004 | 21.2°C | 15.0°C | 8.8°C | 32.2°C | 3.9°C | 34 mm | 67% | 3.3 m/s | 4.9 |
| 2003 | 22.0°C | 15.6°C | 9.2°C | 34.0°C | 5.9°C | 19 mm | 64% | 3.7 m/s | 5.1 |
| 2002 | 22.1°C | 15.5°C | 9.0°C | 31.3°C | 5.6°C | 20 mm | 62% | 4.2 m/s | 5.2 |
| 2001 | 23.1°C | 16.8°C | 10.5°C | 35.5°C | 4.7°C | 45 mm | 64% | 4.1 m/s | 5.5 |
| 2000 | 23.3°C | 16.8°C | 10.4°C | 35.6°C | 6.3°C | 26 mm | 67% | 3.7 m/s | 5.3 |
| 1999 | 24.2°C | 17.6°C | 10.9°C | 34.7°C | 6.5°C | 47 mm | 58% | 4 m/s | 5.1 |
| 1998 | 23.4°C | 16.8°C | 10.1°C | 36.3°C | 6.0°C | 21 mm | 60% | 3.4 m/s | 5.3 |
| 1997 🌧️ | 21.5°C | 15.9°C | 10.3°C | 29.2°C | 7.2°C | 75 mm | 69% | 3.7 m/s | 4.8 |
| 1996 | 21.6°C | 15.7°C | 9.7°C | 31.6°C | 5.6°C | 60 mm | 63% | 4.4 m/s | 5.3 |
| 1995 | 22.2°C | 15.7°C | 9.2°C | 29.9°C | 4.1°C | 19 mm | 59% | 3.6 m/s | 4.8 |
| 1994 | 21.0°C | 14.8°C | 8.5°C | 28.7°C | 4.4°C | 9 mm | 64% | 3.5 m/s | 5.4 |
| 1993 | 22.1°C | 15.7°C | 9.2°C | 32.4°C | 4.9°C | 27 mm | 60% | 3.5 m/s | 5.4 |
| 1992 | 18.8°C | 13.6°C | 8.5°C | 27.4°C | 5.3°C | 68 mm | 70% | 3.7 m/s | 5 |
| 1991 | 21.9°C | 15.7°C | 9.5°C | 32.2°C | 5.0°C | 24 mm | 62% | 3.8 m/s | 5.2 |
| 1990 | 22.5°C | 15.6°C | 8.7°C | 35.0°C | 3.9°C | 33 mm | 61% | 3.4 m/s | 5.4 |
| 1989 | 21.2°C | 14.8°C | 8.5°C | 30.2°C | 5.6°C | 18 mm | 63% | 3.8 m/s | 5.5 |
| 1988 | 24.2°C | 17.1°C | 10.0°C | 34.3°C | 5.8°C | 20 mm | 55% | 4.1 m/s | 5.5 |
| 1987 | 22.6°C | 15.8°C | 9.1°C | 34.9°C | 4.8°C | 17 mm | 64% | 3.3 m/s | 5.1 |
| 1986 | 21.0°C | 14.6°C | 8.1°C | 26.5°C | 3.5°C | 21 mm | 66% | 3.6 m/s | 5.2 |
| 1985 | 20.7°C | 14.4°C | 8.1°C | 29.0°C | 4.1°C | 9 mm | 57% | 4.1 m/s | 5.4 |
| 1984 ❄️ | 18.5°C | 13.0°C | 7.4°C | 27.9°C | 3.7°C | 51 mm | 68% | 3.7 m/s | 4.9 |
| 1983 | 22.7°C | 16.0°C | 9.2°C | 33.9°C | 6.3°C | 22 mm | 64% | 3.8 m/s | — |
| 1982 | 21.8°C | 15.5°C | 9.1°C | 32.1°C | 3.7°C | 23 mm | 56% | 3.5 m/s | — |
| 1981 | 25.2°C | 17.9°C | 10.5°C | 36.6°C | 5.8°C | 2 mm | 55% | 3.5 m/s | — |
Actual recorded September data for each year, 1981–2025 — sourced from NASA POWER.
The average high in September is around 22.6°C with lows near 9.5°C (mean 16.1°C), based on 45 years of NASA POWER data.
September averages 23 mm of rainfall in Ceduna, about average for rainfall. The wettest on record was 75 mm in 1997.
The hottest September reached 38.3°C in 2023. The coldest dipped to 3.5°C in 1986.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average September temperatures have risen by about 1.3°C. Daytime highs moved from 21.8°C to 23.5°C and overnight lows from 8.9°C to 9.9°C over the same span.
September is one of the cooler months of the year in Ceduna and about average for rainfall, so plan for around 22.6°C daytime highs and 9.5°C at night.
Not quite — September is the 5th coolest month in Ceduna, averaging 16.1°C.
For September in Ceduna, pack light layers you can adjust through the day, with typical highs of 22.6°C and lows of 9.5°C.
Relative humidity in September averages 61% — moderately humid.
Average wind speed in September is 3.7 m/s. The windiest September on record averaged 4.4 m/s (1996).
The wettest September on record was 1997 with 75 mm. On average, September sees 23 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 Ceduna 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.
