September is one of the cooler months of the year in Lismore, with average highs near 23.8°C and lows around 13°C (mean 18.4°C). It is one of the drier months, averaging 43 mm of rainfall and 67% relative humidity across the period.
September is one of the cooler months of the year in Lismore. Across 45 years of records, the warmest September in Lismore was 2000 — when the month averaged 20.8°C — while the coldest was 1984 at 16.3°C. Typical September days reach 23.8°C with nights near 13°C. The long-term trend is warming, about 0.4°C per decade.
September is one of the drier months in Lismore, averaging 43 mm of rainfall. The wettest September on record was 1988 with 149 mm, while the driest was 1991 at 2 mm.
Relative humidity in Lismore during September averages 67%. The most humid September was 1983 at 79%, and the least humid was 1991 at 51%.
September receives about 5.2 kWh/m²/day of solar energy in Lismore. The sunniest Septembers were 2003 and 2017 at 5.9 kWh/m²/day, and the cloudiest was 2010 at 4.
Average wind speed in Lismore during September is 2.5 m/s. The windiest September was 2008 at 2.9 m/s, while the calmest was 1987 at 1.9 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 17.5°C | 17.9°C | 19.1°C | 18.7°C | 19.1°C | +1.6°C |
| Avg High | 22.8°C | 23.3°C | 24.6°C | 24.1°C | 24.4°C | +1.6°C |
| Avg Low | 12.1°C | 12.4°C | 13.5°C | 13.2°C | 13.9°C | +1.8°C |
| Avg Rain | 54 mm | 42 mm | 41 mm | 37 mm | 39 mm | -15 mm |
September temperatures in Lismore have risen by about 1.6°C between 1981–1985 and 2021–2025.
September has ranged from a record low of 4.2°C (1987) to a record high of 36.7°C (2017).
Rainfall in September is one of the drier months, averaging 43 mm, with a wettest year of 149 mm.
One of the best times to visit Lismore
September is one of the best times to visit Lismore. Expect days averaging 23.8°C and nights around 13°C (mean 18.4°C) — cooler than Lismore's yearly average — with moderate rainfall (43 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 | 24.1°C | 18.8°C | 13.5°C | 30.7°C | 10.5°C | 10 mm | 72% | 2.3 m/s | 5.4 |
| 2024 | 25.2°C | 19.6°C | 13.9°C | 32.9°C | 10.8°C | 92 mm | 66% | 2.8 m/s | 5.1 |
| 2023 | 26.3°C | 20.5°C | 14.7°C | 35.3°C | 11.9°C | 10 mm | 57% | 2.7 m/s | 5.3 |
| 2022 | 22.4°C | 17.9°C | 13.4°C | 27.7°C | 11.0°C | 88 mm | 73% | 2.5 m/s | 4.4 |
| 2021 | 24.1°C | 18.6°C | 13.1°C | 30.2°C | 9.0°C | 17 mm | 62% | 2.8 m/s | 5.3 |
| 2020 | 24.1°C | 19.3°C | 14.5°C | 30.5°C | 9.1°C | 17 mm | 66% | 2.5 m/s | 5 |
| 2019 | 25.9°C | 20.0°C | 14.0°C | 32.0°C | 10.4°C | 8 mm | 58% | 2.5 m/s | 5.6 |
| 2018 | 23.0°C | 18.2°C | 13.3°C | 30.2°C | 10.4°C | 89 mm | 69% | 2.7 m/s | 4.8 |
| 2017 | 26.9°C | 20.1°C | 13.4°C | 36.7°C | 8.0°C | 7 mm | 57% | 2.5 m/s | 5.9 |
| 2016 | 23.7°C | 18.6°C | 13.5°C | 27.4°C | 10.1°C | 26 mm | 69% | 2.6 m/s | 4.8 |
| 2015 | 23.1°C | 17.9°C | 12.7°C | 29.4°C | 8.6°C | 36 mm | 67% | 2.6 m/s | 5 |
| 2014 | 22.0°C | 17.2°C | 12.3°C | 29.4°C | 7.5°C | 30 mm | 73% | 2.3 m/s | 5.3 |
| 2013 | 26.1°C | 20.1°C | 14.0°C | 34.8°C | 10.9°C | 38 mm | 64% | 2.4 m/s | 5.5 |
| 2012 | 24.3°C | 18.4°C | 12.6°C | 30.0°C | 7.1°C | 20 mm | 66% | 2.4 m/s | 5.6 |
| 2011 | 22.9°C | 17.5°C | 12.1°C | 29.8°C | 7.5°C | 29 mm | 68% | 2.4 m/s | 5.4 |
| 2010 | 23.5°C | 19.0°C | 14.5°C | 28.4°C | 11.0°C | 83 mm | 72% | 2.4 m/s | 4 |
| 2009 | 24.7°C | 18.8°C | 12.9°C | 30.6°C | 8.6°C | 51 mm | 66% | 2.3 m/s | 5.8 |
| 2008 | 23.4°C | 18.8°C | 14.2°C | 31.0°C | 10.0°C | 76 mm | 73% | 2.9 m/s | 5 |
| 2007 | 23.3°C | 18.1°C | 13.0°C | 30.0°C | 9.6°C | 54 mm | 72% | 2.6 m/s | 5.4 |
| 2006 | 22.0°C | 17.8°C | 13.6°C | 27.6°C | 9.5°C | 101 mm | 77% | 2.8 m/s | 5.3 |
| 2005 | 24.1°C | 18.6°C | 13.1°C | 30.8°C | 7.9°C | 44 mm | 69% | 2.7 m/s | 5.1 |
| 2004 | 24.7°C | 19.1°C | 13.5°C | 32.2°C | 9.4°C | 32 mm | 61% | 2.7 m/s | 5.3 |
| 2003 | 27.2°C | 20.4°C | 13.6°C | 36.0°C | 9.5°C | 4 mm | 54% | 2.6 m/s | 5.9 |
| 2002 | 25.9°C | 19.9°C | 13.8°C | 34.0°C | 10.2°C | 18 mm | 62% | 2.8 m/s | 5.4 |
| 2001 | 23.2°C | 18.2°C | 13.2°C | 27.7°C | 9.1°C | 25 mm | 69% | 2.3 m/s | 4.9 |
| 2000 🔥 | 27.6°C | 20.8°C | 14.0°C | 36.2°C | 9.0°C | 8 mm | 56% | 2.8 m/s | 5.6 |
| 1999 | 21.2°C | 17.2°C | 13.1°C | 25.7°C | 9.1°C | 51 mm | 78% | 2.2 m/s | 5 |
| 1998 | 23.2°C | 18.8°C | 14.4°C | 28.1°C | 10.0°C | 110 mm | 75% | 2.5 m/s | 4.7 |
| 1997 | 23.6°C | 18.4°C | 13.2°C | 31.2°C | 10.4°C | 60 mm | 69% | 2.5 m/s | 4.9 |
| 1996 | 24.1°C | 17.8°C | 11.4°C | 31.4°C | 7.1°C | 41 mm | 67% | 2.7 m/s | 5.5 |
| 1995 | 24.3°C | 18.7°C | 13.2°C | 28.4°C | 5.9°C | 32 mm | 65% | 2.5 m/s | 5.2 |
| 1994 | 24.0°C | 17.5°C | 11.0°C | 29.0°C | 7.6°C | 18 mm | 57% | 2.5 m/s | 5.7 |
| 1993 | 22.2°C | 17.3°C | 12.4°C | 30.2°C | 8.6°C | 37 mm | 68% | 2.5 m/s | 4.9 |
| 1992 | 23.8°C | 17.7°C | 11.5°C | 32.1°C | 7.1°C | 26 mm | 60% | 2.5 m/s | 5.4 |
| 1991 | 25.2°C | 18.7°C | 12.2°C | 30.7°C | 7.6°C | 2 mm | 51% | 2.5 m/s | 5.8 |
| 1990 | 21.1°C | 16.5°C | 12.0°C | 28.7°C | 8.0°C | 39 mm | 71% | 2.5 m/s | 5 |
| 1989 | 22.3°C | 16.6°C | 10.9°C | 28.1°C | 7.7°C | 14 mm | 68% | 2.5 m/s | 5.6 |
| 1988 🌧️ | 22.1°C | 17.6°C | 13.2°C | 27.7°C | 7.7°C | 149 mm | 78% | 2.7 m/s | 4.9 |
| 1987 | 21.9°C | 16.5°C | 11.1°C | 26.9°C | 4.2°C | 5 mm | 74% | 1.9 m/s | 5.6 |
| 1986 | 24.6°C | 19.0°C | 13.3°C | 31.6°C | 6.7°C | 18 mm | 62% | 2.8 m/s | 5.3 |
| 1985 | 21.4°C | 16.5°C | 11.6°C | 27.1°C | 7.4°C | 66 mm | 71% | 2.3 m/s | 5.2 |
| 1984 ❄️ | 22.2°C | 16.3°C | 10.5°C | 25.5°C | 7.0°C | 29 mm | 64% | 2.3 m/s | 5.6 |
| 1983 | 23.0°C | 18.1°C | 13.1°C | 28.4°C | 9.5°C | 71 mm | 79% | 2.6 m/s | — |
| 1982 | 22.6°C | 17.2°C | 11.8°C | 30.3°C | 7.3°C | 118 mm | 66% | 2.5 m/s | — |
| 1981 | 25.2°C | 19.3°C | 13.3°C | 34.3°C | 6.6°C | 17 mm | 64% | 2.3 m/s | — |
Actual recorded September data for each year, 1981–2025 — sourced from NASA POWER.
The average high in September is around 23.8°C with lows near 13°C (mean 18.4°C), based on 45 years of NASA POWER data.
September averages 43 mm of rainfall in Lismore, one of the drier months. The wettest on record was 149 mm in 1988.
The hottest September reached 36.7°C in 2017. The coldest dipped to 4.2°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 22.9°C to 24.4°C and overnight lows from 12.1°C to 13.7°C over the same span.
September is one of the cooler months of the year in Lismore and one of the drier months, so plan for around 23.8°C daytime highs and 13°C at night.
Not quite — September is the 5th coolest month in Lismore, averaging 18.4°C.
For September in Lismore, pack light layers you can adjust through the day, with typical highs of 23.8°C and lows of 13°C.
Relative humidity in September averages 67% — moderately humid.
Average wind speed in September is 2.5 m/s. The windiest September on record averaged 2.9 m/s (2008).
The wettest September on record was 1988 with 149 mm. On average, September sees 43 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 Lismore 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.
