September is one of the cooler months of the year in Carnarvon, with average highs near 24.7°C and lows around 16.1°C (mean 20.4°C). It is one of the drier months, averaging 7 mm of rainfall and 62% relative humidity across the period.
September is one of the cooler months of the year in Carnarvon. Across 45 years of records, the warmest September in Carnarvon was 2015 — when the month averaged 22.7°C — while the coldest was 2016 at 18.6°C. Typical September days reach 24.7°C with nights near 16.1°C. The long-term September temperature trend is broadly flat.
September is one of the drier months in Carnarvon, averaging 7 mm of rainfall. The wettest September on record was 2014 with 29 mm, while the driest were 1994, 2015 and 2023 at 0 mm.
Relative humidity in Carnarvon during September averages 62%. The most humid September was 1996 at 69%, and the least humid was 2015 at 53%.
September receives about 6.3 kWh/m²/day of solar energy in Carnarvon. The sunniest Septembers were 2018 and 2021 at 6.7 kWh/m²/day, and the cloudiest was 2022 at 5.8.
Average wind speed in Carnarvon during September is 5.4 m/s. The windiest September was 2002 at 6.2 m/s, while the calmest was 1984 at 4.8 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 20.7°C | 20.0°C | 20.0°C | 20.7°C | 21.1°C | +0.4°C |
| Avg High | 25.1°C | 23.9°C | 24.2°C | 25.3°C | 25.6°C | +0.5°C |
| Avg Low | 16.3°C | 16.0°C | 15.7°C | 16.2°C | 16.5°C | +0.2°C |
| Avg Rain | 9 mm | 7 mm | 5 mm | 8 mm | 6 mm | -3 mm |
September temperatures in Carnarvon have risen by about 0.5°C between 1981–1985 and 2021–2025.
September has ranged from a record low of 9.7°C (1998) to a record high of 35.7°C (2010).
Rainfall in September is one of the drier months, averaging 7 mm, with a wettest year of 29 mm.
Daytime highs and overnight lows have shifted differently — highs rose about 0.2°C per decade while lows rose 0°C per decade, widening the gap between day and night.
One of the best times to visit Carnarvon
September is one of the best times to visit Carnarvon. Expect days averaging 24.7°C and nights around 16.1°C (mean 20.4°C) — cooler than Carnarvon's yearly average — with low rainfall (7 mm), so conditions are generally comfortable for sightseeing and outdoor plans.
| Year | Avg High | Avg Temp | Avg Low | Hottest Day | Coldest Day | Rainfall | Humidity | Wind | Solar |
|---|---|---|---|---|---|---|---|---|---|
| 2025 | 25.9°C | 21.0°C | 16.2°C | 32.7°C | 10.9°C | 12 mm | 53% | 5.6 m/s | 6.5 |
| 2024 | 27.1°C | 22.1°C | 17.2°C | 32.9°C | 13.0°C | 3 mm | 56% | 5.7 m/s | 6.6 |
| 2023 | 26.1°C | 21.8°C | 17.6°C | 35.7°C | 14.8°C | 0 mm | 65% | 5.6 m/s | 6.4 |
| 2022 | 24.0°C | 19.9°C | 15.7°C | 30.6°C | 13.2°C | 18 mm | 62% | 5.6 m/s | 5.8 |
| 2021 | 25.2°C | 20.5°C | 15.7°C | 32.9°C | 10.8°C | 1 mm | 57% | 5.4 m/s | 6.7 |
| 2020 | 25.5°C | 21.1°C | 16.7°C | 32.8°C | 13.8°C | 2 mm | 60% | 5.5 m/s | 6.4 |
| 2019 | 26.3°C | 21.5°C | 16.7°C | 34.3°C | 13.1°C | 1 mm | 60% | 5.1 m/s | 6.6 |
| 2018 | 25.0°C | 20.1°C | 15.2°C | 30.8°C | 11.6°C | 4 mm | 59% | 5.9 m/s | 6.7 |
| 2017 | 25.1°C | 20.8°C | 16.5°C | 33.9°C | 12.0°C | 26 mm | 62% | 5 m/s | 6.4 |
| 2016 ❄️ | 22.9°C | 18.6°C | 14.2°C | 26.7°C | 11.0°C | 2 mm | 61% | 5.8 m/s | 6.6 |
| 2015 🔥 | 28.4°C | 22.7°C | 17.0°C | 35.5°C | 12.0°C | 0 mm | 53% | 4.9 m/s | 6.5 |
| 2014 🌧️ | 25.9°C | 21.7°C | 17.6°C | 31.2°C | 14.7°C | 29 mm | 65% | 5.1 m/s | 6.2 |
| 2013 | 23.6°C | 20.3°C | 17.0°C | 28.3°C | 14.3°C | 7 mm | 63% | 5.4 m/s | 6.1 |
| 2012 | 25.0°C | 21.0°C | 17.0°C | 31.1°C | 12.6°C | 6 mm | 63% | 5.1 m/s | 6.2 |
| 2011 | 24.6°C | 19.9°C | 15.2°C | 27.6°C | 11.7°C | 3 mm | 61% | 5.4 m/s | 6.5 |
| 2010 | 25.9°C | 20.6°C | 15.2°C | 35.7°C | 11.1°C | 3 mm | 54% | 5.1 m/s | 6.6 |
| 2009 | 23.6°C | 19.3°C | 15.0°C | 31.6°C | 12.2°C | 6 mm | 61% | 5.9 m/s | 6.4 |
| 2008 | 24.7°C | 20.3°C | 15.8°C | 31.1°C | 11.5°C | 2 mm | 62% | 5.4 m/s | 6.3 |
| 2007 | 24.3°C | 20.1°C | 15.8°C | 31.7°C | 11.7°C | 8 mm | 65% | 5.5 m/s | 6.5 |
| 2006 | 25.6°C | 21.3°C | 16.9°C | 32.6°C | 13.8°C | 8 mm | 64% | 5.3 m/s | 6.1 |
| 2005 | 22.6°C | 18.9°C | 15.2°C | 29.4°C | 12.4°C | 9 mm | 67% | 5.7 m/s | 6.4 |
| 2004 | 23.0°C | 18.8°C | 14.6°C | 28.2°C | 11.1°C | 6 mm | 66% | 5.5 m/s | 6.3 |
| 2003 | 23.6°C | 19.8°C | 16.0°C | 31.8°C | 14.1°C | 2 mm | 63% | 5.4 m/s | 6.3 |
| 2002 | 24.8°C | 20.1°C | 15.4°C | 32.1°C | 11.7°C | 4 mm | 59% | 6.2 m/s | 6.5 |
| 2001 | 24.4°C | 20.1°C | 15.9°C | 30.1°C | 11.7°C | 5 mm | 62% | 5.9 m/s | 6.2 |
| 2000 | 25.6°C | 20.9°C | 16.2°C | 33.3°C | 14.4°C | 3 mm | 62% | 5.8 m/s | 6.4 |
| 1999 | 24.4°C | 20.3°C | 16.2°C | 33.7°C | 10.4°C | 3 mm | 62% | 5.1 m/s | 6.1 |
| 1998 | 23.1°C | 19.1°C | 15.1°C | 26.4°C | 9.7°C | 2 mm | 66% | 5.5 m/s | 6.1 |
| 1997 | 23.1°C | 19.5°C | 15.9°C | 28.1°C | 13.3°C | 20 mm | 68% | 5.2 m/s | 6.4 |
| 1996 | 23.5°C | 19.9°C | 16.3°C | 28.6°C | 11.7°C | 6 mm | 69% | 5.1 m/s | 6.2 |
| 1995 | 24.3°C | 20.5°C | 16.7°C | 30.3°C | 12.2°C | 5 mm | 64% | 5.7 m/s | 6.2 |
| 1994 | 25.6°C | 21.3°C | 17.0°C | 32.1°C | 13.0°C | 0 mm | 62% | 5.1 m/s | 6.4 |
| 1993 | 23.8°C | 19.7°C | 15.5°C | 28.7°C | 10.9°C | 17 mm | 61% | 4.9 m/s | 6.3 |
| 1992 | 22.5°C | 19.1°C | 15.8°C | 29.8°C | 13.1°C | 7 mm | 65% | 5.3 m/s | 5.9 |
| 1991 | 23.4°C | 19.6°C | 15.8°C | 28.6°C | 11.2°C | 4 mm | 64% | 5.5 m/s | 6.2 |
| 1990 | 25.6°C | 20.5°C | 15.4°C | 34.5°C | 11.6°C | 4 mm | 58% | 5 m/s | 6.4 |
| 1989 | 25.2°C | 20.9°C | 16.6°C | 31.5°C | 14.4°C | 2 mm | 61% | 5.4 m/s | 6.4 |
| 1988 | 25.3°C | 21.0°C | 16.8°C | 32.0°C | 12.1°C | 4 mm | 62% | 5.1 m/s | 6.2 |
| 1987 | 27.1°C | 21.9°C | 16.7°C | 32.3°C | 13.3°C | 3 mm | 53% | 5.1 m/s | 6.1 |
| 1986 | 23.2°C | 19.3°C | 15.4°C | 29.7°C | 12.5°C | 24 mm | 66% | 5.2 m/s | 6.2 |
| 1985 | 24.7°C | 20.4°C | 16.0°C | 32.1°C | 12.9°C | 3 mm | 64% | 5.4 m/s | 6.5 |
| 1984 | 23.9°C | 19.6°C | 15.2°C | 28.9°C | 10.6°C | 8 mm | 65% | 4.8 m/s | 6.4 |
| 1983 | 25.7°C | 21.4°C | 17.2°C | 34.9°C | 14.7°C | 5 mm | 64% | 5.3 m/s | — |
| 1982 | 25.2°C | 20.7°C | 16.2°C | 32.9°C | 13.2°C | 12 mm | 58% | 5.7 m/s | — |
| 1981 | 25.2°C | 21.0°C | 16.9°C | 31.1°C | 14.0°C | 16 mm | 66% | 5.1 m/s | — |
Actual recorded September data for each year, 1981–2025 — sourced from NASA POWER.
The average high in September is around 24.7°C with lows near 16.1°C (mean 20.4°C), based on 45 years of NASA POWER data.
September averages 7 mm of rainfall in Carnarvon, one of the drier months. The wettest on record was 29 mm in 2014.
The hottest September reached 35.7°C in 2010. The coldest dipped to 9.7°C in 1998.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average September temperatures have risen by about 0.5°C. Daytime highs moved from 24.9°C to 25.7°C and overnight lows from 16.3°C to 16.5°C over the same span.
September is one of the cooler months of the year in Carnarvon and one of the drier months, so plan for around 24.7°C daytime highs and 16.1°C at night.
Not quite — September is the 4th coolest month in Carnarvon, averaging 20.4°C.
For September in Carnarvon, pack light layers you can adjust through the day, with typical highs of 24.7°C and lows of 16.1°C.
Relative humidity in September averages 62% — moderately humid.
Average wind speed in September is 5.4 m/s. The windiest September on record averaged 6.2 m/s (2002).
The wettest September on record was 2014 with 29 mm. On average, September sees 7 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 Carnarvon 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.
