September is one of the cooler months of the year in Hervey Bay, with average highs near 23.2°C and lows around 18.1°C (mean 20.7°C). It is one of the drier months, averaging 37 mm of rainfall and 70% relative humidity across the period.
September is one of the cooler months of the year in Hervey Bay. Across 45 years of records, the warmest September in Hervey Bay was 2013 — when the month averaged 22.4°C — while the coldest was 1990 at 19.2°C. Typical September days reach 23.2°C with nights near 18.1°C. The long-term trend is warming, about 0.3°C per decade.
September is one of the drier months in Hervey Bay, averaging 37 mm of rainfall. The wettest September on record was 1998 with 126 mm, while the driest was 2000 at 1 mm.
Relative humidity in Hervey Bay during September averages 70%. The most humid September was 2007 at 78%, and the least humid was 1991 at 61%.
September receives about 5.6 kWh/m²/day of solar energy in Hervey Bay. The sunniest September was 1991 at 6.3 kWh/m²/day, and the cloudiest was 2010 at 4.4.
Average wind speed in Hervey Bay during September is 3.7 m/s. The windiest Septembers were 1993 and 2002 at 4.1 m/s, while the calmest was 2010 at 3.2 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 20.1°C | 20.4°C | 20.7°C | 21.0°C | 21.1°C | +1°C |
| Avg High | 22.7°C | 23.0°C | 23.3°C | 23.5°C | 23.4°C | +0.7°C |
| Avg Low | 17.5°C | 17.8°C | 18.2°C | 18.5°C | 18.7°C | +1.2°C |
| Avg Rain | 28 mm | 49 mm | 39 mm | 34 mm | 29 mm | +1 mm |
September temperatures in Hervey Bay have risen by about 0.9°C between 1981–1985 and 2021–2025.
September has ranged from a record low of 10.8°C (1995) to a record high of 31.2°C (2017).
Rainfall in September is one of the drier months, averaging 37 mm, with a wettest year of 126 mm.
One of the best times to visit Hervey Bay
September is one of the best times to visit Hervey Bay. Expect days averaging 23.2°C and nights around 18.1°C (mean 20.7°C) — cooler than Hervey Bay's yearly average — with moderate rainfall (37 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 | 23.6°C | 21.2°C | 18.7°C | 27.1°C | 15.9°C | 24 mm | 72% | 3.4 m/s | 5.6 |
| 2024 | 24.0°C | 21.6°C | 19.1°C | 27.0°C | 16.6°C | 20 mm | 71% | 3.9 m/s | 5.6 |
| 2023 | 23.6°C | 21.4°C | 19.2°C | 28.1°C | 17.9°C | 14 mm | 69% | 3.9 m/s | 5.6 |
| 2022 | 23.1°C | 20.6°C | 18.1°C | 26.5°C | 15.4°C | 67 mm | 73% | 3.4 m/s | 4.7 |
| 2021 | 22.9°C | 20.3°C | 17.8°C | 25.9°C | 13.7°C | 11 mm | 67% | 3.9 m/s | 5.7 |
| 2020 | 23.3°C | 21.2°C | 19.1°C | 26.3°C | 16.2°C | 37 mm | 71% | 3.8 m/s | 5.2 |
| 2019 | 24.3°C | 21.1°C | 18.0°C | 27.7°C | 14.4°C | 2 mm | 66% | 3.3 m/s | 6.1 |
| 2018 | 23.1°C | 20.7°C | 18.3°C | 27.2°C | 16.7°C | 29 mm | 69% | 3.7 m/s | 5.6 |
| 2017 | 24.8°C | 21.8°C | 18.8°C | 31.2°C | 15.3°C | 3 mm | 66% | 3.6 m/s | 6.2 |
| 2016 | 24.1°C | 21.6°C | 19.2°C | 26.9°C | 15.8°C | 42 mm | 68% | 3.7 m/s | 5 |
| 2015 | 22.9°C | 20.5°C | 18.0°C | 25.9°C | 14.7°C | 40 mm | 67% | 3.9 m/s | 5.6 |
| 2014 | 22.5°C | 20.2°C | 17.8°C | 25.5°C | 13.5°C | 39 mm | 69% | 3.6 m/s | 5.6 |
| 2013 🔥 | 25.0°C | 22.4°C | 19.9°C | 28.2°C | 17.5°C | 14 mm | 72% | 4 m/s | 5.8 |
| 2012 | 22.7°C | 20.3°C | 18.0°C | 26.9°C | 14.1°C | 26 mm | 71% | 3.6 m/s | 5.7 |
| 2011 | 22.3°C | 19.7°C | 17.0°C | 25.7°C | 12.0°C | 26 mm | 69% | 3.6 m/s | 5.9 |
| 2010 | 23.3°C | 21.4°C | 19.5°C | 25.5°C | 17.4°C | 120 mm | 76% | 3.2 m/s | 4.4 |
| 2009 | 23.9°C | 21.2°C | 18.4°C | 27.5°C | 15.0°C | 47 mm | 67% | 3.3 m/s | 6.2 |
| 2008 | 22.6°C | 20.5°C | 18.4°C | 27.3°C | 15.1°C | 51 mm | 76% | 3.7 m/s | 5.5 |
| 2007 | 22.0°C | 19.9°C | 17.8°C | 24.6°C | 15.1°C | 107 mm | 78% | 4 m/s | 5.6 |
| 2006 | 22.4°C | 20.3°C | 18.2°C | 24.9°C | 14.8°C | 48 mm | 72% | 3.7 m/s | 5.4 |
| 2005 | 23.4°C | 20.8°C | 18.1°C | 26.2°C | 14.2°C | 23 mm | 69% | 3.5 m/s | 5.8 |
| 2004 | 22.7°C | 20.2°C | 17.7°C | 26.2°C | 14.3°C | 53 mm | 70% | 3.4 m/s | 5.7 |
| 2003 | 24.8°C | 21.6°C | 18.4°C | 28.4°C | 15.2°C | 8 mm | 68% | 3.8 m/s | 6.1 |
| 2002 | 24.0°C | 21.2°C | 18.5°C | 26.7°C | 14.7°C | 19 mm | 70% | 4.1 m/s | 6 |
| 2001 | 23.1°C | 20.6°C | 18.1°C | 26.5°C | 15.3°C | 35 mm | 70% | 3.9 m/s | 5.4 |
| 2000 | 23.9°C | 21.0°C | 18.1°C | 26.9°C | 15.6°C | 1 mm | 68% | 3.4 m/s | 6.2 |
| 1999 | 22.0°C | 20.1°C | 18.2°C | 24.1°C | 15.5°C | 74 mm | 75% | 4 m/s | 5.5 |
| 1998 🌧️ | 23.2°C | 21.4°C | 19.6°C | 25.4°C | 15.0°C | 126 mm | 75% | 4 m/s | 4.9 |
| 1997 | 23.6°C | 21.1°C | 18.7°C | 27.2°C | 16.2°C | 57 mm | 72% | 3.9 m/s | 5.1 |
| 1996 | 23.9°C | 20.4°C | 16.8°C | 27.9°C | 12.6°C | 49 mm | 66% | 3.8 m/s | 5.8 |
| 1995 | 23.2°C | 20.7°C | 18.1°C | 26.9°C | 10.8°C | 25 mm | 70% | 3.7 m/s | 5.5 |
| 1994 | 23.1°C | 19.9°C | 16.8°C | 26.9°C | 13.2°C | 10 mm | 66% | 3.9 m/s | 6 |
| 1993 | 22.1°C | 20.1°C | 18.0°C | 27.7°C | 15.5°C | 64 mm | 71% | 4.1 m/s | 5 |
| 1992 | 22.6°C | 19.9°C | 17.2°C | 25.6°C | 13.9°C | 69 mm | 70% | 3.5 m/s | 5.5 |
| 1991 | 24.5°C | 21.3°C | 18.2°C | 28.8°C | 13.5°C | 2 mm | 61% | 3.5 m/s | 6.3 |
| 1990 ❄️ | 21.6°C | 19.2°C | 16.7°C | 23.8°C | 12.8°C | 11 mm | 67% | 3.9 m/s | 5.6 |
| 1989 | 21.9°C | 19.3°C | 16.7°C | 25.0°C | 13.8°C | 8 mm | 71% | 3.8 m/s | 6 |
| 1988 | 22.8°C | 20.4°C | 18.1°C | 27.4°C | 14.6°C | 51 mm | 73% | 3.7 m/s | 5.4 |
| 1987 | 22.7°C | 20.0°C | 17.4°C | 26.8°C | 12.1°C | 5 mm | 66% | 3.4 m/s | 5.6 |
| 1986 | 23.1°C | 20.6°C | 18.0°C | 26.7°C | 14.3°C | 20 mm | 68% | 3.6 m/s | 5.6 |
| 1985 | 22.6°C | 19.9°C | 17.3°C | 27.1°C | 12.4°C | 50 mm | 69% | 3.9 m/s | 5.6 |
| 1984 | 22.7°C | 19.5°C | 16.4°C | 25.7°C | 13.1°C | 38 mm | 65% | 3.5 m/s | 5.6 |
| 1983 | 23.0°C | 20.8°C | 18.6°C | 26.1°C | 15.4°C | 18 mm | 77% | 3.6 m/s | — |
| 1982 | 22.3°C | 19.6°C | 16.9°C | 27.9°C | 13.7°C | 49 mm | 71% | 3.7 m/s | — |
| 1981 | 23.1°C | 20.7°C | 18.3°C | 28.6°C | 12.4°C | 12 mm | 69% | 3.5 m/s | — |
Actual recorded September data for each year, 1981–2025 — sourced from NASA POWER.
The average high in September is around 23.2°C with lows near 18.1°C (mean 20.7°C), based on 45 years of NASA POWER data.
September averages 37 mm of rainfall in Hervey Bay, one of the drier months. The wettest on record was 126 mm in 1998.
The hottest September reached 31.2°C in 2017. The coldest dipped to 10.8°C in 1995.
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 22.7°C to 23.4°C and overnight lows from 17.5°C to 18.6°C over the same span.
September is one of the cooler months of the year in Hervey Bay and one of the drier months, so plan for around 23.2°C daytime highs and 18.1°C at night.
Not quite — September is the 4th coolest month in Hervey Bay, averaging 20.7°C.
For September in Hervey Bay, pack light layers you can adjust through the day, with typical highs of 23.2°C and lows of 18.1°C.
Relative humidity in September averages 70% — moderately humid.
Average wind speed in September is 3.7 m/s. The windiest September on record averaged 4.1 m/s (1993).
The wettest September on record was 1998 with 126 mm. On average, September sees 37 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 Hervey Bay 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.
