September is one of the cooler months of the year in Coffs Harbour, with average highs near 20.7°C and lows around 14.8°C (mean 17.8°C). It is one of the drier months, averaging 50 mm of rainfall and 70% relative humidity across the period.
September is one of the cooler months of the year in Coffs Harbour. Across 45 years of records, the warmest September in Coffs Harbour was 2013 — when the month averaged 19.6°C — while the coldest were 1985 and 1990 at 15.9°C. Typical September days reach 20.7°C with nights near 14.8°C. The long-term trend is warming, about 0.3°C per decade.
September is one of the drier months in Coffs Harbour, averaging 50 mm of rainfall. The wettest September on record was 1988 with 170 mm, while the driest was 2017 at 3 mm.
Relative humidity in Coffs Harbour during September averages 70%. The most humid September was 1988 at 79%, and the least humid was 2003 at 58%.
September receives about 5.2 kWh/m²/day of solar energy in Coffs Harbour. The sunniest September was 2003 at 5.7 kWh/m²/day, and the cloudiest were 2010 and 2022 at 4.5.
Average wind speed in Coffs Harbour during September is 3.3 m/s. The windiest September was 2006 at 3.8 m/s, while the calmest was 1987 at 2.8 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 17.0°C | 17.2°C | 18.3°C | 18.1°C | 18.2°C | +1.2°C |
| Avg High | 20.0°C | 20.1°C | 21.2°C | 21.0°C | 21.1°C | +1.1°C |
| Avg Low | 14.1°C | 14.3°C | 15.3°C | 15.1°C | 15.4°C | +1.3°C |
| Avg Rain | 57 mm | 60 mm | 50 mm | 38 mm | 40 mm | -17 mm |
September temperatures in Coffs Harbour have risen by about 1.2°C between 1981–1985 and 2021–2025.
September has ranged from a record low of 8.1°C (1987) to a record high of 30.2°C (2003).
Rainfall in September is one of the drier months, averaging 50 mm, with a wettest year of 170 mm.
A good time to visit Coffs Harbour
September is a good time to visit Coffs Harbour, with days averaging 20.7°C and nights around 14.8°C (mean 17.8°C, cooler than Coffs Harbour's yearly average) and moderate rainfall. December 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 | 21.1°C | 18.2°C | 15.4°C | 25.4°C | 12.7°C | 23 mm | 74% | 3 m/s | 5.3 |
| 2024 | 22.1°C | 18.9°C | 15.7°C | 26.1°C | 13.2°C | 71 mm | 67% | 3.5 m/s | 5 |
| 2023 | 22.5°C | 19.1°C | 15.8°C | 26.8°C | 13.1°C | 3 mm | 66% | 3.3 m/s | 5.5 |
| 2022 | 19.2°C | 17.1°C | 14.9°C | 22.7°C | 13.0°C | 94 mm | 77% | 3.3 m/s | 4.5 |
| 2021 | 20.9°C | 17.8°C | 14.7°C | 25.3°C | 11.9°C | 21 mm | 68% | 3.7 m/s | 5.1 |
| 2020 | 21.0°C | 18.3°C | 15.6°C | 26.5°C | 11.3°C | 27 mm | 71% | 3.3 m/s | 5.3 |
| 2019 | 21.7°C | 18.5°C | 15.2°C | 26.0°C | 13.1°C | 22 mm | 66% | 3.2 m/s | 5.2 |
| 2018 | 20.0°C | 17.4°C | 14.8°C | 24.9°C | 12.4°C | 81 mm | 73% | 3.6 m/s | 5 |
| 2017 | 22.9°C | 19.1°C | 15.4°C | 29.5°C | 11.7°C | 3 mm | 60% | 3.1 m/s | 5.5 |
| 2016 | 21.2°C | 18.4°C | 15.6°C | 23.5°C | 13.3°C | 24 mm | 70% | 3.3 m/s | 4.7 |
| 2015 | 19.9°C | 17.3°C | 14.6°C | 24.3°C | 12.5°C | 68 mm | 72% | 3.4 m/s | 5 |
| 2014 | 19.2°C | 16.8°C | 14.4°C | 24.3°C | 11.6°C | 26 mm | 75% | 3.2 m/s | 5.1 |
| 2013 🔥 | 22.8°C | 19.6°C | 16.4°C | 28.4°C | 13.9°C | 20 mm | 66% | 3.2 m/s | 5.5 |
| 2012 | 20.8°C | 17.6°C | 14.3°C | 26.2°C | 10.1°C | 24 mm | 69% | 3.1 m/s | 5.5 |
| 2011 | 19.7°C | 17.1°C | 14.4°C | 24.2°C | 11.2°C | 44 mm | 73% | 3.3 m/s | 5.2 |
| 2010 | 21.5°C | 18.7°C | 15.9°C | 25.5°C | 13.3°C | 70 mm | 71% | 3.1 m/s | 4.5 |
| 2009 | 21.6°C | 18.5°C | 15.4°C | 26.1°C | 12.3°C | 19 mm | 68% | 3.3 m/s | 5.5 |
| 2008 | 20.2°C | 17.7°C | 15.1°C | 25.6°C | 11.6°C | 114 mm | 76% | 3.7 m/s | 5 |
| 2007 | 19.9°C | 17.4°C | 14.9°C | 23.7°C | 12.8°C | 58 mm | 76% | 3.4 m/s | 5.2 |
| 2006 | 20.0°C | 17.7°C | 15.4°C | 24.4°C | 13.2°C | 105 mm | 77% | 3.8 m/s | 5.3 |
| 2005 | 21.0°C | 18.0°C | 15.1°C | 25.5°C | 11.7°C | 82 mm | 70% | 3.4 m/s | 4.9 |
| 2004 | 21.1°C | 18.2°C | 15.3°C | 27.9°C | 11.4°C | 63 mm | 69% | 3.4 m/s | 5.1 |
| 2003 | 23.2°C | 19.4°C | 15.6°C | 30.2°C | 12.8°C | 4 mm | 58% | 3.2 m/s | 5.7 |
| 2002 | 22.0°C | 18.7°C | 15.4°C | 28.8°C | 12.0°C | 14 mm | 67% | 3.3 m/s | 5.4 |
| 2001 | 20.7°C | 18.0°C | 15.3°C | 24.6°C | 13.3°C | 23 mm | 71% | 3.3 m/s | 5.3 |
| 2000 | 22.7°C | 19.1°C | 15.5°C | 28.6°C | 12.6°C | 13 mm | 65% | 3.1 m/s | 5.3 |
| 1999 | 19.4°C | 17.3°C | 15.2°C | 23.6°C | 11.7°C | 68 mm | 77% | 3.1 m/s | 5.1 |
| 1998 | 20.5°C | 18.4°C | 16.2°C | 24.0°C | 13.3°C | 162 mm | 78% | 3.3 m/s | 4.8 |
| 1997 | 20.6°C | 17.8°C | 14.9°C | 24.7°C | 13.2°C | 68 mm | 70% | 3.3 m/s | 4.7 |
| 1996 | 20.3°C | 17.0°C | 13.7°C | 24.8°C | 11.2°C | 40 mm | 72% | 3.4 m/s | 5.2 |
| 1995 | 20.0°C | 17.0°C | 14.1°C | 24.1°C | 9.0°C | 56 mm | 73% | 3.4 m/s | 5 |
| 1994 | 20.7°C | 17.1°C | 13.5°C | 23.3°C | 10.8°C | 22 mm | 61% | 3.3 m/s | 5.5 |
| 1993 | 19.8°C | 17.1°C | 14.3°C | 25.6°C | 11.3°C | 50 mm | 70% | 3.5 m/s | 5.1 |
| 1992 | 20.5°C | 17.0°C | 13.4°C | 26.5°C | 9.8°C | 21 mm | 63% | 3.3 m/s | 5.1 |
| 1991 | 21.4°C | 17.7°C | 14.0°C | 26.0°C | 10.0°C | 3 mm | 59% | 3.2 m/s | 5.6 |
| 1990 | 18.1°C | 15.9°C | 13.7°C | 22.9°C | 10.8°C | 107 mm | 76% | 3.4 m/s | 4.8 |
| 1989 | 19.1°C | 16.2°C | 13.2°C | 23.2°C | 9.5°C | 13 mm | 72% | 3.4 m/s | 5.3 |
| 1988 🌧️ | 20.2°C | 17.8°C | 15.3°C | 24.0°C | 11.5°C | 170 mm | 79% | 3.7 m/s | 5.1 |
| 1987 | 19.5°C | 16.6°C | 13.6°C | 24.0°C | 8.1°C | 8 mm | 72% | 2.8 m/s | 5.6 |
| 1986 | 20.8°C | 17.6°C | 14.5°C | 25.5°C | 9.8°C | 38 mm | 69% | 3.2 m/s | 5.1 |
| 1985 ❄️ | 18.4°C | 15.9°C | 13.5°C | 22.8°C | 10.1°C | 68 mm | 75% | 3.1 m/s | 5 |
| 1984 | 19.5°C | 16.1°C | 12.8°C | 22.9°C | 10.7°C | 33 mm | 65% | 3.2 m/s | 5.3 |
| 1983 | 20.7°C | 17.8°C | 14.8°C | 24.8°C | 12.8°C | 54 mm | 76% | 3.2 m/s | — |
| 1982 | 19.8°C | 16.7°C | 13.7°C | 25.2°C | 10.4°C | 106 mm | 68% | 3.5 m/s | — |
| 1981 | 22.0°C | 18.6°C | 15.1°C | 28.0°C | 10.2°C | 29 mm | 68% | 3.2 m/s | — |
Actual recorded September data for each year, 1981–2025 — sourced from NASA POWER.
The average high in September is around 20.7°C with lows near 14.8°C (mean 17.8°C), based on 45 years of NASA POWER data.
September averages 50 mm of rainfall in Coffs Harbour, one of the drier months. The wettest on record was 170 mm in 1988.
The hottest September reached 30.2°C in 2003. The coldest dipped to 8.1°C in 1987.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average September temperatures have risen by about 1.2°C. Daytime highs moved from 20.1°C to 21.2°C and overnight lows from 14°C to 15.3°C over the same span.
September is one of the cooler months of the year in Coffs Harbour and one of the drier months, so plan for around 20.7°C daytime highs and 14.8°C at night.
Not quite — September is the 4th coolest month in Coffs Harbour, averaging 17.8°C.
For September in Coffs Harbour, pack light layers you can adjust through the day, with typical highs of 20.7°C and lows of 14.8°C.
Relative humidity in September averages 70% — moderately humid.
Average wind speed in September is 3.3 m/s. The windiest September on record averaged 3.8 m/s (2006).
The wettest September on record was 1988 with 170 mm. On average, September sees 50 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 Coffs Harbour 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.
