September is one of the cooler months of the year in Kalbarri, with average highs near 24.5°C and lows around 12.2°C (mean 18.4°C). It is about average for rainfall, averaging 21 mm of rainfall and 63% relative humidity across the period.
September is one of the cooler months of the year in Kalbarri. Across 45 years of records, the warmest September in Kalbarri was 2023 — when the month averaged 20.3°C — while the coldest was 2016 at 16.3°C. Typical September days reach 24.5°C with nights near 12.2°C. The long-term trend is warming, about 0.2°C per decade.
September is about average for rainfall in Kalbarri, averaging 21 mm of rainfall. The wettest September on record was 2014 with 72 mm, while the driest was 2019 at 3 mm.
Relative humidity in Kalbarri during September averages 63%. The most humid September was 1992 at 70%, and the least humid was 1987 at 53%.
September receives about 5.9 kWh/m²/day of solar energy in Kalbarri. The sunniest Septembers were 2019 and 2024 at 6.3 kWh/m²/day, and the cloudiest were 2013, 2014 and 2022, among others at 5.5.
Average wind speed in Kalbarri during September is 3.9 m/s. The windiest September was 2024 at 4.5 m/s, while the calmest were 1989, 1992 and 1993, among others at 3.5 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 18.6°C | 17.7°C | 17.9°C | 18.6°C | 19.1°C | +0.5°C |
| Avg High | 24.8°C | 23.6°C | 24.0°C | 25.0°C | 25.4°C | +0.6°C |
| Avg Low | 12.3°C | 11.9°C | 11.9°C | 12.3°C | 12.8°C | +0.5°C |
| Avg Rain | 17 mm | 25 mm | 24 mm | 22 mm | 15 mm | -2 mm |
September temperatures in Kalbarri have risen by about 0.5°C between 1981–1985 and 2021–2025.
September has ranged from a record low of 6.4°C (1993) to a record high of 37.8°C (2023).
Rainfall in September is about average for rainfall, averaging 21 mm, with a wettest year of 72 mm.
A good time to visit Kalbarri
September is a good time to visit Kalbarri, with days averaging 24.5°C and nights around 12.2°C (mean 18.4°C, cooler than Kalbarri's yearly average) and low rainfall. October and November 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 | 25.0°C | 18.6°C | 12.1°C | 32.4°C | 6.7°C | 20 mm | 57% | 4.1 m/s | 6.1 |
| 2024 | 26.8°C | 20.1°C | 13.5°C | 31.2°C | 10.0°C | 5 mm | 56% | 4.5 m/s | 6.3 |
| 2023 🔥 | 26.6°C | 20.3°C | 14.0°C | 37.8°C | 9.3°C | 8 mm | 65% | 4 m/s | 6.1 |
| 2022 | 23.5°C | 17.9°C | 12.3°C | 29.9°C | 10.0°C | 46 mm | 66% | 4 m/s | 5.5 |
| 2021 | 25.1°C | 18.6°C | 12.2°C | 32.6°C | 7.3°C | 8 mm | 57% | 4 m/s | 6.2 |
| 2020 | 25.1°C | 19.0°C | 12.9°C | 33.1°C | 10.4°C | 6 mm | 61% | 3.9 m/s | 5.9 |
| 2019 | 27.1°C | 20.0°C | 12.8°C | 34.7°C | 9.0°C | 3 mm | 58% | 3.7 m/s | 6.3 |
| 2018 | 24.8°C | 18.2°C | 11.6°C | 33.5°C | 7.7°C | 11 mm | 60% | 4.1 m/s | 6.2 |
| 2017 | 24.4°C | 18.5°C | 12.7°C | 33.9°C | 7.3°C | 35 mm | 62% | 3.8 m/s | 5.7 |
| 2016 ❄️ | 22.4°C | 16.3°C | 10.2°C | 27.8°C | 6.9°C | 8 mm | 63% | 4.1 m/s | 6.2 |
| 2015 | 27.3°C | 19.9°C | 12.6°C | 34.3°C | 6.5°C | 6 mm | 54% | 3.6 m/s | 6.2 |
| 2014 🌧️ | 26.3°C | 19.9°C | 13.6°C | 33.0°C | 9.9°C | 72 mm | 65% | 3.8 m/s | 5.5 |
| 2013 | 23.4°C | 18.3°C | 13.2°C | 29.8°C | 9.5°C | 27 mm | 67% | 3.9 m/s | 5.5 |
| 2012 | 25.1°C | 19.1°C | 13.1°C | 32.8°C | 8.6°C | 23 mm | 61% | 4 m/s | 5.9 |
| 2011 | 23.8°C | 17.6°C | 11.5°C | 27.3°C | 8.3°C | 21 mm | 64% | 3.7 m/s | 6 |
| 2010 | 25.7°C | 18.6°C | 11.6°C | 35.1°C | 6.5°C | 12 mm | 54% | 3.9 m/s | 6.2 |
| 2009 | 22.5°C | 16.7°C | 11.0°C | 30.4°C | 7.8°C | 36 mm | 65% | 3.9 m/s | 6 |
| 2008 | 24.1°C | 18.1°C | 12.1°C | 30.0°C | 8.1°C | 24 mm | 64% | 4 m/s | 5.7 |
| 2007 | 24.6°C | 18.3°C | 12.1°C | 32.3°C | 8.6°C | 21 mm | 64% | 3.8 m/s | 6.1 |
| 2006 | 25.8°C | 19.5°C | 13.2°C | 32.5°C | 9.8°C | 13 mm | 60% | 4.1 m/s | 5.8 |
| 2005 | 22.7°C | 17.1°C | 11.4°C | 28.8°C | 7.7°C | 23 mm | 65% | 4.1 m/s | 6 |
| 2004 | 23.7°C | 17.5°C | 11.2°C | 27.5°C | 7.1°C | 33 mm | 63% | 3.9 m/s | 5.7 |
| 2003 | 22.6°C | 17.3°C | 12.1°C | 30.5°C | 9.2°C | 36 mm | 67% | 3.9 m/s | 5.6 |
| 2002 | 24.5°C | 18.0°C | 11.5°C | 33.1°C | 7.8°C | 18 mm | 60% | 4.3 m/s | 6 |
| 2001 | 23.9°C | 17.7°C | 11.5°C | 33.5°C | 7.3°C | 26 mm | 66% | 3.9 m/s | 5.7 |
| 2000 | 25.3°C | 18.9°C | 12.4°C | 31.6°C | 10.3°C | 9 mm | 64% | 3.8 m/s | 6 |
| 1999 | 23.3°C | 17.5°C | 11.7°C | 32.4°C | 7.0°C | 36 mm | 66% | 3.9 m/s | 5.6 |
| 1998 | 22.7°C | 17.1°C | 11.5°C | 27.5°C | 6.8°C | 18 mm | 64% | 4.1 m/s | 5.9 |
| 1997 | 23.5°C | 17.8°C | 12.2°C | 28.0°C | 8.2°C | 35 mm | 68% | 3.7 m/s | 6.1 |
| 1996 | 23.0°C | 17.6°C | 12.2°C | 27.4°C | 8.3°C | 23 mm | 68% | 3.9 m/s | 5.7 |
| 1995 | 24.5°C | 18.5°C | 12.4°C | 31.5°C | 6.9°C | 25 mm | 65% | 3.9 m/s | 5.9 |
| 1994 | 26.2°C | 19.6°C | 13.0°C | 33.8°C | 8.0°C | 4 mm | 61% | 3.7 m/s | 6.1 |
| 1993 | 23.0°C | 17.0°C | 11.1°C | 29.7°C | 6.4°C | 24 mm | 62% | 3.5 m/s | 5.9 |
| 1992 | 21.3°C | 16.4°C | 11.4°C | 28.5°C | 9.1°C | 53 mm | 70% | 3.5 m/s | 5.5 |
| 1991 | 23.6°C | 17.6°C | 11.6°C | 31.2°C | 7.4°C | 17 mm | 67% | 3.7 m/s | 6 |
| 1990 | 25.2°C | 18.3°C | 11.4°C | 34.5°C | 7.0°C | 14 mm | 57% | 3.7 m/s | 6 |
| 1989 | 24.7°C | 18.5°C | 12.3°C | 30.6°C | 9.7°C | 9 mm | 63% | 3.5 m/s | 6.1 |
| 1988 | 24.5°C | 18.5°C | 12.5°C | 31.1°C | 7.8°C | 13 mm | 65% | 3.5 m/s | 5.6 |
| 1987 | 26.7°C | 19.6°C | 12.4°C | 32.5°C | 8.3°C | 4 mm | 53% | 3.8 m/s | 6 |
| 1986 | 23.3°C | 17.5°C | 11.7°C | 30.3°C | 8.7°C | 21 mm | 67% | 3.6 m/s | 5.7 |
| 1985 | 25.1°C | 18.8°C | 12.5°C | 31.5°C | 9.0°C | 16 mm | 63% | 3.9 m/s | 6 |
| 1984 | 24.0°C | 17.7°C | 11.3°C | 29.5°C | 7.0°C | 26 mm | 62% | 3.6 m/s | 5.9 |
| 1983 | 25.3°C | 19.3°C | 13.2°C | 33.8°C | 9.8°C | 29 mm | 65% | 3.9 m/s | — |
| 1982 | 24.4°C | 18.2°C | 12.0°C | 32.2°C | 7.9°C | 30 mm | 59% | 4.4 m/s | — |
| 1981 | 25.1°C | 19.0°C | 13.0°C | 33.6°C | 8.2°C | 8 mm | 66% | 3.5 m/s | — |
Actual recorded September data for each year, 1981–2025 — sourced from NASA POWER.
The average high in September is around 24.5°C with lows near 12.2°C (mean 18.4°C), based on 45 years of NASA POWER data.
September averages 21 mm of rainfall in Kalbarri, about average for rainfall. The wettest on record was 72 mm in 2014.
The hottest September reached 37.8°C in 2023. The coldest dipped to 6.4°C in 1993.
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 24.8°C to 25.4°C and overnight lows from 12.4°C to 12.8°C over the same span.
September is one of the cooler months of the year in Kalbarri and about average for rainfall, so plan for around 24.5°C daytime highs and 12.2°C at night.
Not quite — September is the 4th coolest month in Kalbarri, averaging 18.4°C.
For September in Kalbarri, pack light layers you can adjust through the day, with typical highs of 24.5°C and lows of 12.2°C.
Relative humidity in September averages 63% — moderately humid.
Average wind speed in September is 3.9 m/s. The windiest September on record averaged 4.5 m/s (2024).
The wettest September on record was 2014 with 72 mm. On average, September sees 21 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 Kalbarri 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.
