September is one of the cooler months of the year in Ballina, with average highs near 21.1°C and lows around 17.9°C (mean 19.5°C). It is one of the drier months, averaging 44 mm of rainfall and 71% relative humidity across the period.
September is one of the cooler months of the year in Ballina. Across 45 years of records, the warmest Septembers in Ballina were 2003 and 2013 — when the month averaged 20.8°C — while the coldest were 1984 and 1990 at 18.2°C. Typical September days reach 21.1°C with nights near 17.9°C. The long-term trend is warming, about 0.2°C per decade.
September is one of the drier months in Ballina, averaging 44 mm of rainfall. The wettest September on record was 1988 with 160 mm, while the driest was 1991 at 2 mm.
Relative humidity in Ballina during September averages 71%. The most humid September was 2008 at 76%, and the least humid was 1991 at 62%.
September receives about 5.2 kWh/m²/day of solar energy in Ballina. The sunniest Septembers were 2003 and 2017 at 5.9 kWh/m²/day, and the cloudiest was 2010 at 4.
Average wind speed in Ballina during September is 5.5 m/s. The windiest Septembers were 2008 and 2021 at 6.2 m/s, while the calmest was 1987 at 4.2 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 19.0°C | 19.2°C | 19.9°C | 19.7°C | 19.9°C | +0.9°C |
| Avg High | 20.7°C | 20.8°C | 21.4°C | 21.3°C | 21.3°C | +0.6°C |
| Avg Low | 17.4°C | 17.5°C | 18.3°C | 18.2°C | 18.5°C | +1.1°C |
| Avg Rain | 56 mm | 47 mm | 42 mm | 34 mm | 40 mm | -15 mm |
September temperatures in Ballina have risen by about 0.9°C between 1981–1985 and 2021–2025.
September has ranged from a record low of 11.8°C (1987) to a record high of 27.9°C (2003).
Rainfall in September is one of the drier months, averaging 44 mm, with a wettest year of 160 mm.
One of the best times to visit Ballina
September is one of the best times to visit Ballina. Expect days averaging 21.1°C and nights around 17.9°C (mean 19.5°C) — cooler than Ballina's yearly average — with moderate rainfall (44 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 | 21.5°C | 20.1°C | 18.7°C | 24.2°C | 15.5°C | 10 mm | 73% | 5 m/s | 5.4 |
| 2024 | 22.1°C | 20.5°C | 19.0°C | 26.6°C | 16.6°C | 97 mm | 72% | 5.9 m/s | 5.1 |
| 2023 | 21.8°C | 20.4°C | 19.0°C | 26.3°C | 17.5°C | 12 mm | 70% | 5.4 m/s | 5.3 |
| 2022 | 20.5°C | 19.2°C | 17.9°C | 23.8°C | 16.4°C | 92 mm | 75% | 5.6 m/s | 4.4 |
| 2021 | 20.9°C | 19.4°C | 17.9°C | 23.9°C | 15.2°C | 15 mm | 71% | 6.2 m/s | 5.3 |
| 2020 | 21.0°C | 19.9°C | 18.7°C | 24.2°C | 16.0°C | 15 mm | 72% | 5.3 m/s | 5 |
| 2019 | 20.9°C | 19.3°C | 17.8°C | 24.2°C | 15.3°C | 8 mm | 72% | 5.2 m/s | 5.6 |
| 2018 | 20.6°C | 19.4°C | 18.2°C | 24.3°C | 16.6°C | 75 mm | 72% | 5.8 m/s | 4.8 |
| 2017 | 22.3°C | 20.3°C | 18.4°C | 27.7°C | 14.8°C | 5 mm | 69% | 5.5 m/s | 5.9 |
| 2016 | 21.6°C | 20.1°C | 18.6°C | 24.1°C | 16.5°C | 25 mm | 71% | 5.6 m/s | 4.8 |
| 2015 | 20.7°C | 19.2°C | 17.7°C | 24.0°C | 15.5°C | 45 mm | 70% | 5.4 m/s | 5 |
| 2014 | 20.4°C | 19.0°C | 17.6°C | 23.5°C | 13.8°C | 28 mm | 72% | 5.2 m/s | 5.3 |
| 2013 | 22.5°C | 20.8°C | 19.1°C | 25.4°C | 17.6°C | 35 mm | 73% | 5.4 m/s | 5.5 |
| 2012 | 20.8°C | 19.3°C | 17.8°C | 25.2°C | 14.2°C | 14 mm | 72% | 5.1 m/s | 5.6 |
| 2011 | 20.8°C | 19.1°C | 17.4°C | 25.6°C | 13.1°C | 30 mm | 70% | 5.4 m/s | 5.4 |
| 2010 | 21.9°C | 20.5°C | 19.1°C | 24.7°C | 17.3°C | 77 mm | 73% | 5.2 m/s | 4 |
| 2009 | 22.0°C | 20.4°C | 18.8°C | 26.2°C | 15.7°C | 29 mm | 68% | 5.1 m/s | 5.8 |
| 2008 | 20.7°C | 19.4°C | 18.2°C | 24.4°C | 16.0°C | 69 mm | 76% | 6.2 m/s | 5 |
| 2007 | 21.3°C | 19.7°C | 18.1°C | 25.2°C | 16.3°C | 52 mm | 74% | 5.7 m/s | 5.4 |
| 2006 | 20.5°C | 19.4°C | 18.2°C | 22.9°C | 15.2°C | 108 mm | 75% | 6 m/s | 5.3 |
| 2005 | 21.1°C | 19.6°C | 18.1°C | 24.6°C | 14.7°C | 56 mm | 72% | 6 m/s | 5.1 |
| 2004 | 21.2°C | 19.8°C | 18.3°C | 24.5°C | 16.0°C | 54 mm | 71% | 5.8 m/s | 5.3 |
| 2003 🔥 | 23.0°C | 20.8°C | 18.5°C | 27.9°C | 16.6°C | 8 mm | 67% | 5.9 m/s | 5.9 |
| 2002 | 22.0°C | 20.3°C | 18.6°C | 25.1°C | 15.4°C | 21 mm | 72% | 5.9 m/s | 5.4 |
| 2001 | 20.7°C | 19.3°C | 18.0°C | 22.6°C | 16.6°C | 23 mm | 72% | 5 m/s | 4.9 |
| 2000 | 21.7°C | 19.9°C | 18.0°C | 26.0°C | 15.8°C | 5 mm | 73% | 6 m/s | 5.6 |
| 1999 | 20.5°C | 19.4°C | 18.2°C | 23.1°C | 16.4°C | 60 mm | 73% | 5 m/s | 5 |
| 1998 | 21.8°C | 20.5°C | 19.1°C | 24.7°C | 16.4°C | 122 mm | 74% | 5.4 m/s | 4.7 |
| 1997 | 21.0°C | 19.5°C | 18.0°C | 25.8°C | 16.6°C | 55 mm | 74% | 5.6 m/s | 4.9 |
| 1996 | 21.1°C | 18.9°C | 16.7°C | 24.7°C | 13.2°C | 34 mm | 72% | 5.7 m/s | 5.5 |
| 1995 | 20.8°C | 19.2°C | 17.6°C | 23.9°C | 12.0°C | 35 mm | 74% | 5.6 m/s | 5.2 |
| 1994 | 20.6°C | 18.5°C | 16.5°C | 25.0°C | 13.3°C | 25 mm | 67% | 5.4 m/s | 5.7 |
| 1993 | 20.4°C | 19.0°C | 17.7°C | 25.8°C | 15.7°C | 54 mm | 70% | 5.5 m/s | 4.9 |
| 1992 | 20.9°C | 19.0°C | 17.1°C | 26.3°C | 12.6°C | 37 mm | 67% | 5.6 m/s | 5.4 |
| 1991 | 21.4°C | 19.4°C | 17.4°C | 26.5°C | 13.9°C | 2 mm | 62% | 5.2 m/s | 5.8 |
| 1990 | 19.5°C | 18.2°C | 16.9°C | 23.1°C | 13.3°C | 48 mm | 71% | 5.5 m/s | 5 |
| 1989 | 20.1°C | 18.4°C | 16.7°C | 23.0°C | 14.4°C | 13 mm | 69% | 5.7 m/s | 5.6 |
| 1988 🌧️ | 21.1°C | 19.7°C | 18.3°C | 25.2°C | 14.0°C | 160 mm | 75% | 6 m/s | 4.9 |
| 1987 | 20.5°C | 18.8°C | 17.1°C | 24.0°C | 11.8°C | 3 mm | 70% | 4.2 m/s | 5.6 |
| 1986 | 21.1°C | 19.5°C | 17.9°C | 25.2°C | 14.5°C | 22 mm | 70% | 5.8 m/s | 5.3 |
| 1985 | 20.0°C | 18.6°C | 17.1°C | 23.8°C | 12.2°C | 72 mm | 71% | 5 m/s | 5.2 |
| 1984 ❄️ | 20.1°C | 18.2°C | 16.2°C | 22.2°C | 13.6°C | 30 mm | 67% | 5.2 m/s | 5.6 |
| 1983 | 21.8°C | 20.0°C | 18.2°C | 26.0°C | 15.7°C | 63 mm | 76% | 5.6 m/s | — |
| 1982 | 20.1°C | 18.4°C | 16.7°C | 25.1°C | 13.7°C | 126 mm | 72% | 5.6 m/s | — |
| 1981 | 21.4°C | 19.7°C | 18.1°C | 26.6°C | 12.0°C | 13 mm | 70% | 4.9 m/s | — |
Actual recorded September data for each year, 1981–2025 — sourced from NASA POWER.
The average high in September is around 21.1°C with lows near 17.9°C (mean 19.5°C), based on 45 years of NASA POWER data.
September averages 44 mm of rainfall in Ballina, one of the drier months. The wettest on record was 160 mm in 1988.
The hottest September reached 27.9°C in 2003. The coldest dipped to 11.8°C in 1987.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average September temperatures have risen by about 0.9°C. Daytime highs moved from 20.7°C to 21.4°C and overnight lows from 17.3°C to 18.5°C over the same span.
September is one of the cooler months of the year in Ballina and one of the drier months, so plan for around 21.1°C daytime highs and 17.9°C at night.
Not quite — September is the 4th coolest month in Ballina, averaging 19.5°C.
For September in Ballina, pack light layers you can adjust through the day, with typical highs of 21.1°C and lows of 17.9°C.
Relative humidity in September averages 71% — moderately humid.
Average wind speed in September is 5.5 m/s. The windiest September on record averaged 6.2 m/s (2008).
The wettest September on record was 1988 with 160 mm. On average, September sees 44 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 Ballina 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.
