September is one of the cooler months of the year in Roebourne, with average highs near 33.7°C and lows around 17.6°C (mean 25.7°C). It is one of the drier months, averaging 2 mm of rainfall and 37% relative humidity across the period.
September is one of the cooler months of the year in Roebourne. Across 45 years of records, the warmest September in Roebourne was 2020 — when the month averaged 28.3°C — while the coldest was 1992 at 23.6°C. Typical September days reach 33.7°C with nights near 17.6°C. The long-term trend is warming, about 0.2°C per decade.
September is one of the drier months in Roebourne, averaging 2 mm of rainfall. The wettest September on record was 2010 with 24 mm, while the driest were 2020, 2021 and 2023, among others at 0 mm.
Relative humidity in Roebourne during September averages 37%. The most humid September was 1997 at 47%, and the least humid was 1981 at 29%.
September receives about 6.6 kWh/m²/day of solar energy in Roebourne. The sunniest September was 2002 at 6.9 kWh/m²/day, and the cloudiest was 2010 at 5.9.
Average wind speed in Roebourne during September is 3.7 m/s. The windiest Septembers were 1998 and 2011 at 4.2 m/s, while the calmest was 2006 at 3.2 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 25.7°C | 25.1°C | 25.6°C | 25.5°C | 26.9°C | +1.2°C |
| Avg High | 33.8°C | 33.2°C | 33.7°C | 33.7°C | 34.6°C | +0.8°C |
| Avg Low | 17.6°C | 17.0°C | 17.4°C | 17.3°C | 19.1°C | +1.5°C |
| Avg Rain | 2 mm | 1 mm | 0 mm | 3 mm | 2 mm | 0 mm |
September temperatures in Roebourne have risen by about 0.7°C between 1981–1985 and 2021–2025.
September has ranged from a record low of 10.4°C (2004) to a record high of 41.8°C (2023).
Rainfall in September is one of the drier months, averaging 2 mm, with a wettest year of 24 mm.
A good time to visit Roebourne
September is a good time to visit Roebourne, with days averaging 33.7°C and nights around 17.6°C (mean 25.7°C, cooler than Roebourne's yearly average) and low rainfall. August and June 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 | 34.1°C | 26.1°C | 18.0°C | 38.4°C | 13.9°C | 1 mm | 32% | 3.8 m/s | 6.7 |
| 2024 | 34.7°C | 28.2°C | 21.6°C | 38.5°C | 17.4°C | 5 mm | 41% | 3.5 m/s | 6.1 |
| 2023 | 36.3°C | 28.1°C | 20.0°C | 41.8°C | 14.6°C | 0 mm | 37% | 3.4 m/s | 6.4 |
| 2022 | 32.2°C | 24.6°C | 17.0°C | 38.6°C | 13.4°C | 6 mm | 42% | 3.7 m/s | 6.5 |
| 2021 | 33.8°C | 25.8°C | 17.9°C | 38.0°C | 14.1°C | 0 mm | 31% | 4.1 m/s | 6.6 |
| 2020 🔥 | 36.6°C | 28.3°C | 20.0°C | 39.8°C | 16.7°C | 0 mm | 30% | 3.9 m/s | 6.7 |
| 2019 | 34.1°C | 25.7°C | 17.2°C | 37.5°C | 14.3°C | 0 mm | 37% | 3.3 m/s | 6.7 |
| 2018 | 34.6°C | 26.3°C | 17.9°C | 39.4°C | 13.9°C | 0 mm | 32% | 3.6 m/s | 6.7 |
| 2017 | 34.0°C | 26.0°C | 18.0°C | 39.2°C | 14.8°C | 0 mm | 37% | 3.8 m/s | 6.7 |
| 2016 | 32.2°C | 24.3°C | 16.4°C | 34.5°C | 13.8°C | 2 mm | 40% | 3.6 m/s | 6.5 |
| 2015 | 35.1°C | 26.7°C | 18.2°C | 38.3°C | 13.6°C | 0 mm | 33% | 3.4 m/s | 6.8 |
| 2014 | 34.8°C | 26.4°C | 17.9°C | 38.9°C | 15.1°C | 0 mm | 36% | 3.6 m/s | 6.7 |
| 2013 | 33.8°C | 25.5°C | 17.2°C | 38.0°C | 13.8°C | 1 mm | 42% | 3.8 m/s | 6.7 |
| 2012 | 34.4°C | 26.1°C | 17.8°C | 37.7°C | 14.2°C | 0 mm | 40% | 4.1 m/s | 6.7 |
| 2011 | 32.7°C | 24.4°C | 16.2°C | 35.6°C | 13.4°C | 0 mm | 34% | 4.2 m/s | 6.7 |
| 2010 🌧️ | 31.3°C | 23.9°C | 16.4°C | 40.0°C | 12.6°C | 24 mm | 40% | 4 m/s | 5.9 |
| 2009 | 33.6°C | 25.1°C | 16.6°C | 37.5°C | 14.5°C | 0 mm | 33% | 4 m/s | 6.8 |
| 2008 | 34.9°C | 26.9°C | 18.8°C | 39.4°C | 16.3°C | 0 mm | 33% | 3.7 m/s | 6.4 |
| 2007 | 34.9°C | 26.4°C | 17.8°C | 39.0°C | 15.7°C | 0 mm | 33% | 3.8 m/s | 6.8 |
| 2006 | 34.7°C | 26.7°C | 18.8°C | 41.2°C | 14.7°C | 3 mm | 42% | 3.2 m/s | 6.4 |
| 2005 | 32.4°C | 24.3°C | 16.1°C | 35.9°C | 12.8°C | 0 mm | 44% | 3.7 m/s | 6.7 |
| 2004 | 32.4°C | 24.2°C | 16.0°C | 38.1°C | 10.4°C | 0 mm | 40% | 3.9 m/s | 6.7 |
| 2003 | 33.1°C | 25.0°C | 16.8°C | 38.6°C | 14.4°C | 0 mm | 39% | 3.8 m/s | 6.6 |
| 2002 | 32.8°C | 24.7°C | 16.5°C | 38.1°C | 13.4°C | 0 mm | 44% | 3.7 m/s | 6.9 |
| 2001 | 33.0°C | 25.4°C | 17.8°C | 38.2°C | 12.1°C | 0 mm | 40% | 3.6 m/s | 6 |
| 2000 | 35.6°C | 27.2°C | 18.9°C | 41.1°C | 14.0°C | 0 mm | 35% | 3.4 m/s | 6.7 |
| 1999 | 34.4°C | 26.2°C | 18.0°C | 37.9°C | 14.2°C | 0 mm | 35% | 3.8 m/s | 6.7 |
| 1998 | 33.8°C | 25.9°C | 17.9°C | 40.9°C | 14.2°C | 0 mm | 36% | 4.2 m/s | 6.5 |
| 1997 | 32.4°C | 24.2°C | 15.9°C | 37.0°C | 12.8°C | 5 mm | 47% | 3.6 m/s | 6.5 |
| 1996 | 33.7°C | 25.4°C | 17.1°C | 37.4°C | 15.3°C | 0 mm | 40% | 3.9 m/s | 6.7 |
| 1995 | 33.0°C | 25.5°C | 17.9°C | 37.3°C | 13.4°C | 1 mm | 45% | 3.8 m/s | 6.4 |
| 1994 | 35.1°C | 26.4°C | 17.6°C | 38.4°C | 14.4°C | 0 mm | 31% | 3.7 m/s | 6.7 |
| 1993 | 31.9°C | 24.0°C | 16.1°C | 36.4°C | 10.8°C | 0 mm | 35% | 3.8 m/s | 6.7 |
| 1992 ❄️ | 31.4°C | 23.6°C | 15.8°C | 36.1°C | 10.8°C | 0 mm | 39% | 3.9 m/s | 6.2 |
| 1991 | 32.7°C | 24.3°C | 15.9°C | 39.6°C | 13.1°C | 0 mm | 39% | 4 m/s | 6.6 |
| 1990 | 33.5°C | 25.5°C | 17.5°C | 39.5°C | 14.2°C | 0 mm | 35% | 3.9 m/s | 6.5 |
| 1989 | 35.3°C | 26.7°C | 18.1°C | 39.7°C | 15.8°C | 0 mm | 30% | 3.6 m/s | 6.4 |
| 1988 | 34.4°C | 25.7°C | 17.0°C | 38.3°C | 13.9°C | 0 mm | 32% | 3.6 m/s | 6.7 |
| 1987 | 33.7°C | 25.5°C | 17.3°C | 38.0°C | 15.2°C | 0 mm | 35% | 3.6 m/s | 6.4 |
| 1986 | 32.0°C | 24.1°C | 16.3°C | 36.1°C | 13.4°C | 8 mm | 44% | 3.7 m/s | 6.3 |
| 1985 | 34.0°C | 25.8°C | 17.6°C | 36.8°C | 13.5°C | 0 mm | 35% | 3.5 m/s | 6.5 |
| 1984 | 31.7°C | 23.8°C | 16.0°C | 35.9°C | 13.1°C | 2 mm | 44% | 3.7 m/s | 6.4 |
| 1983 | 35.5°C | 27.3°C | 19.1°C | 40.2°C | 14.9°C | 5 mm | 35% | 3.8 m/s | — |
| 1982 | 32.0°C | 24.9°C | 17.7°C | 38.4°C | 14.0°C | 5 mm | 43% | 3.8 m/s | — |
| 1981 | 35.6°C | 27.5°C | 19.4°C | 39.0°C | 15.4°C | 0 mm | 29% | 4 m/s | — |
Actual recorded September data for each year, 1981–2025 — sourced from NASA POWER.
The average high in September is around 33.7°C with lows near 17.6°C (mean 25.7°C), based on 45 years of NASA POWER data.
September averages 2 mm of rainfall in Roebourne, one of the drier months. The wettest on record was 24 mm in 2010.
The hottest September reached 41.8°C in 2023. The coldest dipped to 10.4°C in 2004.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average September temperatures have risen by about 0.7°C. Daytime highs moved from 33.8°C to 34.2°C and overnight lows from 18°C to 18.9°C over the same span.
September is one of the cooler months of the year in Roebourne and one of the drier months, so plan for around 33.7°C daytime highs and 17.6°C at night.
Not quite — September is the 5th coolest month in Roebourne, averaging 25.7°C.
For September in Roebourne, pack light, breathable clothing and sun protection, with typical highs of 33.7°C and lows of 17.6°C.
Relative humidity in September averages 37% — relatively dry.
Average wind speed in September is 3.7 m/s. The windiest September on record averaged 4.2 m/s (1998).
The wettest September on record was 2010 with 24 mm. On average, September sees 2 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 Roebourne 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.
