September is one of the cooler months of the year in Narrabri, with average highs near 22.5°C and lows around 7.8°C (mean 15.2°C). It is one of the drier months, averaging 40 mm of rainfall and 60% relative humidity across the period.
September is one of the cooler months of the year in Narrabri. Across 45 years of records, the warmest September in Narrabri was 2023 — when the month averaged 18.5°C — while the coldest was 1984 at 12°C. Typical September days reach 22.5°C with nights near 7.8°C. The long-term trend is warming, about 0.5°C per decade.
September is one of the drier months in Narrabri, averaging 40 mm of rainfall. The wettest September on record was 1998 with 134 mm, while the driest was 2019 at 2 mm.
Relative humidity in Narrabri during September averages 60%. The most humid September was 1998 at 82%, and the least humid was 2019 at 36%.
September receives about 5.5 kWh/m²/day of solar energy in Narrabri. The sunniest September was 2023 at 6.1 kWh/m²/day, and the cloudiest was 2016 at 4.5.
Average wind speed in Narrabri during September is 2.3 m/s. The windiest September was 1988 at 2.7 m/s, while the calmest was 1987 at 1.8 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 14.3°C | 14.2°C | 16.0°C | 15.5°C | 16.1°C | +1.8°C |
| Avg High | 21.5°C | 21.3°C | 23.6°C | 22.9°C | 23.5°C | +2°C |
| Avg Low | 7.1°C | 7.1°C | 8.4°C | 8.1°C | 8.6°C | +1.5°C |
| Avg Rain | 38 mm | 50 mm | 34 mm | 38 mm | 36 mm | -2 mm |
September temperatures in Narrabri have risen by about 1.6°C between 1981–1985 and 2021–2025.
September has ranged from a record low of -0.8°C (1987) to a record high of 35.5°C (2000).
Rainfall in September is one of the drier months, averaging 40 mm, with a wettest year of 134 mm.
A good time to visit Narrabri
September is a good time to visit Narrabri, with days averaging 22.5°C and nights around 7.8°C (mean 15.2°C, cooler than Narrabri's yearly average) and moderate rainfall. November and March 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 | 23.4°C | 15.9°C | 8.4°C | 31.3°C | 3.8°C | 26 mm | 59% | 2.1 m/s | 5.6 |
| 2024 | 24.5°C | 16.5°C | 8.6°C | 29.6°C | 3.0°C | 22 mm | 54% | 2.4 m/s | 5.6 |
| 2023 🔥 | 27.2°C | 18.5°C | 9.9°C | 33.0°C | 2.4°C | 4 mm | 40% | 2.1 m/s | 6.1 |
| 2022 | 20.2°C | 14.3°C | 8.5°C | 25.1°C | 4.9°C | 92 mm | 72% | 2.4 m/s | 4.9 |
| 2021 | 21.9°C | 14.6°C | 7.3°C | 27.0°C | 1.3°C | 48 mm | 63% | 2.4 m/s | 5.6 |
| 2020 | 24.0°C | 16.5°C | 8.9°C | 28.5°C | 2.7°C | 27 mm | 60% | 2.4 m/s | 5.6 |
| 2019 | 25.7°C | 17.3°C | 8.9°C | 32.2°C | 1.8°C | 2 mm | 36% | 2.5 m/s | 6 |
| 2018 | 23.2°C | 15.6°C | 8.0°C | 30.5°C | 3.0°C | 32 mm | 57% | 2.4 m/s | 5.5 |
| 2017 | 24.9°C | 16.7°C | 8.5°C | 34.3°C | 2.5°C | 3 mm | 41% | 2.5 m/s | 5.8 |
| 2016 | 19.4°C | 13.6°C | 7.7°C | 22.6°C | 3.2°C | 101 mm | 75% | 2.4 m/s | 4.5 |
| 2015 | 22.0°C | 14.6°C | 7.2°C | 27.6°C | 2.6°C | 15 mm | 62% | 2.1 m/s | 5.9 |
| 2014 | 22.1°C | 14.8°C | 7.6°C | 30.6°C | 1.9°C | 20 mm | 61% | 2.2 m/s | 5.9 |
| 2013 | 26.1°C | 17.9°C | 9.6°C | 32.4°C | 4.8°C | 27 mm | 52% | 2.2 m/s | 6 |
| 2012 | 23.2°C | 15.2°C | 7.2°C | 29.8°C | 1.0°C | 22 mm | 55% | 2.3 m/s | 5.8 |
| 2011 | 22.9°C | 15.2°C | 7.6°C | 29.1°C | 1.7°C | 90 mm | 58% | 2.4 m/s | 5.4 |
| 2010 | 19.9°C | 14.2°C | 8.4°C | 24.6°C | 2.4°C | 67 mm | 76% | 1.9 m/s | 4.8 |
| 2009 | 23.7°C | 16.4°C | 9.1°C | 29.8°C | 2.6°C | 56 mm | 55% | 2.5 m/s | 5.4 |
| 2008 | 23.1°C | 15.9°C | 8.7°C | 31.2°C | 3.7°C | 44 mm | 62% | 2.4 m/s | 5.3 |
| 2007 | 23.3°C | 15.6°C | 7.9°C | 31.2°C | 4.0°C | 2 mm | 54% | 2.4 m/s | 6 |
| 2006 | 24.4°C | 16.5°C | 8.7°C | 31.7°C | 4.2°C | 34 mm | 58% | 2.4 m/s | 5.8 |
| 2005 | 21.8°C | 14.9°C | 8.1°C | 28.0°C | 2.6°C | 80 mm | 67% | 2.1 m/s | 5.4 |
| 2004 | 22.1°C | 14.8°C | 7.5°C | 32.3°C | -0.1°C | 55 mm | 62% | 2 m/s | 5.6 |
| 2003 | 24.0°C | 16.0°C | 7.9°C | 33.6°C | 1.4°C | 3 mm | 50% | 2.4 m/s | 6 |
| 2002 | 24.5°C | 16.5°C | 8.4°C | 31.9°C | 2.3°C | 31 mm | 49% | 2.5 m/s | 5.3 |
| 2001 | 23.1°C | 15.6°C | 8.1°C | 29.3°C | 4.2°C | 27 mm | 62% | 2.2 m/s | 5.3 |
| 2000 | 25.9°C | 17.8°C | 9.7°C | 35.5°C | 2.8°C | 8 mm | 52% | 2.3 m/s | 5.7 |
| 1999 | 23.1°C | 16.0°C | 8.9°C | 29.7°C | 2.7°C | 35 mm | 61% | 2.1 m/s | 5.4 |
| 1998 🌧️ | 20.3°C | 14.6°C | 9.0°C | 27.5°C | 2.3°C | 134 mm | 82% | 2 m/s | 4.9 |
| 1997 | 22.2°C | 15.1°C | 7.9°C | 27.4°C | 3.7°C | 80 mm | 64% | 2.2 m/s | 5.4 |
| 1996 | 21.2°C | 14.1°C | 7.0°C | 29.5°C | 1.5°C | 38 mm | 63% | 2.6 m/s | 5.3 |
| 1995 | 21.8°C | 14.7°C | 7.6°C | 27.6°C | -0.7°C | 69 mm | 62% | 2.1 m/s | 5.2 |
| 1994 | 22.6°C | 14.2°C | 5.8°C | 25.8°C | 1.4°C | 5 mm | 42% | 2.4 m/s | 5.9 |
| 1993 | 19.8°C | 13.1°C | 6.3°C | 26.7°C | 2.7°C | 69 mm | 69% | 2.3 m/s | 5.3 |
| 1992 | 20.5°C | 13.0°C | 5.4°C | 27.6°C | 0.8°C | 21 mm | 58% | 2.4 m/s | 5.4 |
| 1991 | 21.9°C | 14.3°C | 6.6°C | 27.0°C | -0.1°C | 18 mm | 54% | 2.4 m/s | 5.7 |
| 1990 | 19.8°C | 13.3°C | 6.7°C | 27.3°C | 1.8°C | 26 mm | 73% | 2.3 m/s | 5.6 |
| 1989 | 21.1°C | 13.3°C | 5.5°C | 29.4°C | 1.8°C | 3 mm | 63% | 2.2 m/s | 6 |
| 1988 | 21.5°C | 15.0°C | 8.5°C | 30.4°C | 2.6°C | 71 mm | 71% | 2.7 m/s | 5.1 |
| 1987 | 21.8°C | 14.2°C | 6.5°C | 28.5°C | -0.8°C | 11 mm | 61% | 1.8 m/s | 5.7 |
| 1986 | 21.8°C | 14.7°C | 7.6°C | 29.4°C | 2.7°C | 80 mm | 65% | 2.2 m/s | 5.2 |
| 1985 | 20.2°C | 13.3°C | 6.4°C | 25.6°C | 0.0°C | 28 mm | 65% | 2.1 m/s | 5.7 |
| 1984 ❄️ | 18.8°C | 12.0°C | 5.2°C | 23.1°C | 0.3°C | 41 mm | 65% | 2.4 m/s | 5.4 |
| 1983 | 21.4°C | 14.9°C | 8.4°C | 27.5°C | 4.1°C | 66 mm | 74% | 2.5 m/s | — |
| 1982 | 22.8°C | 15.1°C | 7.3°C | 29.7°C | 2.0°C | 21 mm | 47% | 2.4 m/s | — |
| 1981 | 24.5°C | 16.5°C | 8.5°C | 31.9°C | 1.3°C | 27 mm | 56% | 1.9 m/s | — |
Actual recorded September data for each year, 1981–2025 — sourced from NASA POWER.
The average high in September is around 22.5°C with lows near 7.8°C (mean 15.2°C), based on 45 years of NASA POWER data.
September averages 40 mm of rainfall in Narrabri, one of the drier months. The wettest on record was 134 mm in 1998.
The hottest September reached 35.5°C in 2000. The coldest dipped to -0.8°C in 1987.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average September temperatures have risen by about 1.6°C. Daytime highs moved from 21.5°C to 23.4°C and overnight lows from 7.2°C to 8.5°C over the same span.
September is one of the cooler months of the year in Narrabri and one of the drier months, so plan for around 22.5°C daytime highs and 7.8°C at night.
Not quite — September is the 5th coolest month in Narrabri, averaging 15.2°C.
For September in Narrabri, pack warm layers and a jacket for chilly mornings, with typical highs of 22.5°C and lows of 7.8°C.
Relative humidity in September averages 60% — moderately humid.
Average wind speed in September is 2.3 m/s. The windiest September on record averaged 2.7 m/s (1988).
The wettest September on record was 1998 with 134 mm. On average, September sees 40 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 Narrabri 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.
