August is one of the cooler months of the year in Gunnedah, with average highs near 18°C and lows around 4.5°C (mean 11.3°C). It is one of the drier months, averaging 38 mm of rainfall and 70% relative humidity across the period.
August is one of the cooler months of the year in Gunnedah. Across 45 years of records, the warmest August in Gunnedah was 2024 — when the month averaged 14.5°C — while the coldest were 1989 and 1990 at 8.6°C. Typical August days reach 18°C with nights near 4.5°C. The long-term trend is warming, about 0.4°C per decade.
August is one of the drier months in Gunnedah, averaging 38 mm of rainfall. The wettest August on record was 1987 with 118 mm, while the driest was 1995 at 0 mm.
Relative humidity in Gunnedah during August averages 70%. The most humid August was 1998 at 84%, and the least humid was 2019 at 52%.
August receives about 4.2 kWh/m²/day of solar energy in Gunnedah. The sunniest August was 2017 at 4.8 kWh/m²/day, and the cloudiest was 1987 at 3.6.
Average wind speed in Gunnedah during August is 1.8 m/s. The windiest August was 1990 at 2.1 m/s, while the calmest were 1982 and 2023 at 1.4 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 10.5°C | 10.9°C | 11.5°C | 11.4°C | 12.3°C | +1.8°C |
| Avg High | 17.0°C | 17.7°C | 18.6°C | 18.3°C | 18.8°C | +1.8°C |
| Avg Low | 4.1°C | 4.2°C | 4.5°C | 4.5°C | 5.9°C | +1.8°C |
| Avg Rain | 47 mm | 37 mm | 32 mm | 34 mm | 41 mm | -6 mm |
August temperatures in Gunnedah have risen by about 1.9°C between 1981–1985 and 2021–2025.
August has ranged from a record low of -2.5°C (1995) to a record high of 28.9°C (2009).
Rainfall in August is one of the drier months, averaging 38 mm, with a wettest year of 118 mm.
A quieter season to visit Gunnedah
If your dates are flexible, the more temperate months of November and March tend to be the most comfortable for visiting Gunnedah. That said, August — with days averaging 18°C and nights around 4.5°C (mean 11.3°C) and moderate rainfall (38 mm) — can still be rewarding for travellers who don't mind the cooler conditions, and often means fewer crowds.
| Year | Avg High | Avg Temp | Avg Low | Hottest Day | Coldest Day | Rainfall | Humidity | Wind | Solar |
|---|---|---|---|---|---|---|---|---|---|
| 2025 | 17.1°C | 11.4°C | 5.6°C | 23.1°C | 0.1°C | 59 mm | 78% | 2 m/s | 4.1 |
| 2024 🔥 | 20.9°C | 14.5°C | 8.0°C | 28.9°C | 2.7°C | 45 mm | 72% | 1.6 m/s | 4 |
| 2023 | 21.4°C | 14.1°C | 6.7°C | 24.7°C | 1.8°C | 13 mm | 65% | 1.4 m/s | 4.4 |
| 2022 | 17.4°C | 11.6°C | 5.8°C | 23.2°C | 1.8°C | 64 mm | 78% | 1.9 m/s | 3.7 |
| 2021 | 18.5°C | 11.6°C | 4.8°C | 24.5°C | 1.4°C | 34 mm | 73% | 1.8 m/s | 4.3 |
| 2020 | 17.4°C | 10.8°C | 4.3°C | 23.4°C | -0.8°C | 29 mm | 71% | 1.9 m/s | 4.1 |
| 2019 | 20.3°C | 12.5°C | 4.7°C | 26.1°C | -0.7°C | 5 mm | 52% | 2 m/s | 4.7 |
| 2018 | 19.1°C | 11.3°C | 3.5°C | 23.2°C | -0.3°C | 31 mm | 56% | 2 m/s | 4.5 |
| 2017 | 19.2°C | 11.6°C | 4.0°C | 25.7°C | 0.0°C | 17 mm | 59% | 1.9 m/s | 4.8 |
| 2016 | 17.4°C | 11.2°C | 5.0°C | 22.2°C | 0.5°C | 65 mm | 73% | 1.6 m/s | 4 |
| 2015 | 18.1°C | 11.1°C | 4.2°C | 23.7°C | -1.0°C | 39 mm | 72% | 1.7 m/s | 4.3 |
| 2014 | 17.3°C | 11.0°C | 4.7°C | 20.5°C | -0.6°C | 60 mm | 75% | 1.9 m/s | 4.1 |
| 2013 | 19.5°C | 12.3°C | 5.0°C | 26.3°C | -0.6°C | 7 mm | 66% | 1.8 m/s | 4.5 |
| 2012 | 17.6°C | 10.5°C | 3.4°C | 25.3°C | -1.0°C | 11 mm | 67% | 1.9 m/s | 4.5 |
| 2011 | 19.4°C | 13.0°C | 6.5°C | 24.1°C | 2.7°C | 39 mm | 70% | 1.8 m/s | 3.8 |
| 2010 | 15.3°C | 9.7°C | 4.1°C | 19.8°C | 0.4°C | 68 mm | 79% | 2 m/s | 3.8 |
| 2009 | 21.3°C | 13.8°C | 6.2°C | 28.9°C | 0.7°C | 3 mm | 58% | 1.9 m/s | 4.4 |
| 2008 | 16.7°C | 9.6°C | 2.5°C | 22.8°C | -2.0°C | 36 mm | 70% | 1.8 m/s | 4.1 |
| 2007 | 19.2°C | 12.7°C | 6.1°C | 24.9°C | 0.4°C | 55 mm | 71% | 1.9 m/s | 4 |
| 2006 | 19.2°C | 12.0°C | 4.8°C | 23.0°C | 0.6°C | 9 mm | 66% | 1.8 m/s | 4.5 |
| 2005 | 17.6°C | 10.5°C | 3.4°C | 22.8°C | -2.4°C | 20 mm | 72% | 1.8 m/s | 4.5 |
| 2004 | 18.6°C | 11.6°C | 4.6°C | 26.8°C | 1.1°C | 42 mm | 64% | 2 m/s | 4.1 |
| 2003 | 18.4°C | 11.5°C | 4.5°C | 24.9°C | -1.5°C | 75 mm | 71% | 2 m/s | 4 |
| 2002 | 20.5°C | 12.7°C | 4.9°C | 27.2°C | 0.0°C | 10 mm | 57% | 2 m/s | 4.2 |
| 2001 | 17.3°C | 10.3°C | 3.3°C | 21.5°C | 0.1°C | 17 mm | 69% | 2 m/s | 4.2 |
| 2000 | 16.9°C | 10.7°C | 4.5°C | 20.1°C | -1.1°C | 54 mm | 73% | 1.8 m/s | 4 |
| 1999 | 18.3°C | 11.5°C | 4.7°C | 23.4°C | 0.2°C | 47 mm | 72% | 1.8 m/s | 4.3 |
| 1998 | 17.0°C | 11.7°C | 6.4°C | 20.1°C | -1.7°C | 82 mm | 84% | 1.8 m/s | 3.8 |
| 1997 | 18.5°C | 10.9°C | 3.4°C | 23.4°C | -1.3°C | 11 mm | 64% | 1.8 m/s | 4.5 |
| 1996 | 17.3°C | 10.7°C | 4.1°C | 22.6°C | -2.5°C | 83 mm | 71% | 1.8 m/s | 3.9 |
| 1995 | 20.8°C | 13.1°C | 5.4°C | 28.5°C | -2.5°C | 0 mm | 67% | 1.6 m/s | 4.6 |
| 1994 | 18.8°C | 10.9°C | 2.9°C | 25.5°C | -2.3°C | 16 mm | 60% | 1.6 m/s | 4.6 |
| 1993 | 17.5°C | 11.1°C | 4.8°C | 21.1°C | 0.7°C | 28 mm | 76% | 1.6 m/s | 4.3 |
| 1992 | 17.4°C | 10.5°C | 3.6°C | 23.3°C | -1.1°C | 57 mm | 65% | 2 m/s | 4.3 |
| 1991 | 16.6°C | 9.9°C | 3.2°C | 22.4°C | -1.3°C | 2 mm | 70% | 1.9 m/s | 4.6 |
| 1990 | 14.3°C | 8.6°C | 3.0°C | 19.6°C | -1.2°C | 47 mm | 82% | 2.1 m/s | 3.9 |
| 1989 ❄️ | 14.6°C | 8.6°C | 2.5°C | 20.3°C | -0.8°C | 6 mm | 79% | 1.7 m/s | 4.4 |
| 1988 | 17.9°C | 11.4°C | 5.0°C | 23.9°C | -2.1°C | 50 mm | 74% | 1.8 m/s | 4.1 |
| 1987 🌧️ | 17.3°C | 11.6°C | 5.9°C | 22.8°C | 1.5°C | 118 mm | 79% | 1.8 m/s | 3.6 |
| 1986 | 16.0°C | 9.8°C | 3.5°C | 21.1°C | -0.4°C | 44 mm | 75% | 1.8 m/s | 4.2 |
| 1985 | 16.9°C | 10.6°C | 4.2°C | 22.0°C | -1.7°C | 107 mm | 73% | 1.8 m/s | 4 |
| 1984 | 16.2°C | 9.8°C | 3.5°C | 19.7°C | 0.3°C | 28 mm | 76% | 1.9 m/s | 4.4 |
| 1983 | 16.0°C | 10.1°C | 4.2°C | 18.8°C | 1.0°C | 52 mm | 81% | 1.6 m/s | — |
| 1982 | 21.8°C | 13.5°C | 5.3°C | 28.4°C | 0.5°C | 1 mm | 54% | 1.4 m/s | — |
| 1981 | 16.0°C | 9.3°C | 2.7°C | 20.2°C | -1.2°C | 13 mm | 71% | 2 m/s | — |
Actual recorded August data for each year, 1981–2025 — sourced from NASA POWER.
The average high in August is around 18°C with lows near 4.5°C (mean 11.3°C), based on 45 years of NASA POWER data.
August averages 38 mm of rainfall in Gunnedah, one of the drier months. The wettest on record was 118 mm in 1987.
The hottest August reached 28.9°C in 2009. The coldest dipped to -2.5°C in 1995.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average August temperatures have risen by about 1.9°C. Daytime highs moved from 17.4°C to 19.1°C and overnight lows from 4°C to 6.2°C over the same span.
August is one of the cooler months of the year in Gunnedah and one of the drier months, so plan for around 18°C daytime highs and 4.5°C at night.
Not quite — August is the 3rd coolest month in Gunnedah, averaging 11.3°C.
For August in Gunnedah, pack warm layers and a jacket for chilly mornings, with typical highs of 18°C and lows of 4.5°C.
Relative humidity in August averages 70% — moderately humid.
Average wind speed in August is 1.8 m/s. The windiest August on record averaged 2.1 m/s (1990).
The wettest August on record was 1987 with 118 mm. On average, August sees 38 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 Gunnedah behaves each August, 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 August specifically, along with year-by-year records and how the month has changed over the decades.
