August is one of the cooler months of the year in Grafton, with average highs near 19.9°C and lows around 11.5°C (mean 15.7°C). It is one of the drier months, averaging 53 mm of rainfall and 70% relative humidity across the period.
August is one of the cooler months of the year in Grafton. Across 45 years of records, the warmest Augusts in Grafton were 2023 and 2024 — when the month averaged 18.3°C — while the coldest was 1990 at 13.4°C. Typical August days reach 19.9°C with nights near 11.5°C. The long-term trend is warming, about 0.4°C per decade.
August is one of the drier months in Grafton, averaging 53 mm of rainfall. The wettest August on record was 2007 with 208 mm, while the driest was 1991 at 1 mm.
Relative humidity in Grafton during August averages 70%. The most humid August was 1987 at 80%, and the least humid was 2004 at 59%.
August receives about 4.3 kWh/m²/day of solar energy in Grafton. The sunniest August was 2017 at 4.9 kWh/m²/day, and the cloudiest was 1998 at 3.6.
Average wind speed in Grafton during August is 2.5 m/s. The windiest Augusts were 2002 and 2014 at 3 m/s, while the calmest was 1982 at 2.1 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 14.8°C | 15.4°C | 16.0°C | 15.9°C | 16.6°C | +1.8°C |
| Avg High | 18.8°C | 19.5°C | 20.4°C | 20.2°C | 20.6°C | +1.8°C |
| Avg Low | 10.8°C | 11.3°C | 11.7°C | 11.5°C | 12.6°C | +1.8°C |
| Avg Rain | 53 mm | 35 mm | 59 mm | 56 mm | 65 mm | +12 mm |
August temperatures in Grafton have risen by about 2°C between 1981–1985 and 2021–2025.
August has ranged from a record low of 6.1°C (1990) to a record high of 30°C (2024).
Rainfall in August is one of the drier months, averaging 53 mm, with a wettest year of 208 mm.
A quieter season to visit Grafton
If your dates are flexible, the more temperate months of November and October tend to be the most comfortable for visiting Grafton. That said, August — with days averaging 19.9°C and nights around 11.5°C (mean 15.7°C) and moderate rainfall (53 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 | 18.6°C | 15.5°C | 12.4°C | 24.0°C | 8.6°C | 188 mm | 79% | 2.8 m/s | 4 |
| 2024 | 22.1°C | 18.3°C | 14.5°C | 30.0°C | 10.2°C | 120 mm | 77% | 2.3 m/s | 3.8 |
| 2023 🔥 | 22.4°C | 18.3°C | 14.1°C | 28.3°C | 11.2°C | 16 mm | 65% | 2.4 m/s | 4.2 |
| 2022 | 19.1°C | 15.3°C | 11.4°C | 23.0°C | 7.7°C | 19 mm | 77% | 2.5 m/s | 4 |
| 2021 | 21.1°C | 16.5°C | 11.9°C | 25.9°C | 8.1°C | 12 mm | 70% | 2.3 m/s | 4.3 |
| 2020 | 20.2°C | 15.7°C | 11.2°C | 25.7°C | 8.6°C | 37 mm | 68% | 2.4 m/s | 4.6 |
| 2019 | 21.6°C | 16.8°C | 12.1°C | 26.1°C | 7.2°C | 25 mm | 64% | 2.4 m/s | 4.5 |
| 2018 | 21.3°C | 16.1°C | 11.0°C | 26.3°C | 7.8°C | 37 mm | 59% | 2.3 m/s | 4.7 |
| 2017 | 20.0°C | 15.4°C | 10.7°C | 26.3°C | 7.5°C | 2 mm | 69% | 2.4 m/s | 4.9 |
| 2016 | 19.7°C | 16.0°C | 12.3°C | 23.2°C | 9.6°C | 109 mm | 73% | 2.5 m/s | 4 |
| 2015 | 21.2°C | 16.4°C | 11.7°C | 26.8°C | 7.6°C | 22 mm | 68% | 2.2 m/s | 4.5 |
| 2014 | 18.9°C | 15.7°C | 12.4°C | 24.9°C | 9.5°C | 207 mm | 74% | 3 m/s | 3.7 |
| 2013 | 21.2°C | 16.2°C | 11.2°C | 25.2°C | 6.8°C | 5 mm | 68% | 2.2 m/s | 4.6 |
| 2012 | 20.0°C | 15.2°C | 10.5°C | 26.0°C | 7.8°C | 3 mm | 66% | 2.5 m/s | 4.6 |
| 2011 | 19.1°C | 15.6°C | 12.1°C | 23.0°C | 8.1°C | 109 mm | 75% | 2.4 m/s | 3.9 |
| 2010 | 19.3°C | 15.3°C | 11.3°C | 24.4°C | 9.0°C | 45 mm | 68% | 2.6 m/s | 4.3 |
| 2009 | 20.8°C | 16.3°C | 11.7°C | 27.9°C | 8.8°C | 3 mm | 76% | 2.2 m/s | 4.7 |
| 2008 | 19.3°C | 14.6°C | 9.9°C | 25.2°C | 6.4°C | 23 mm | 65% | 2.6 m/s | 4.4 |
| 2007 🌧️ | 21.0°C | 16.7°C | 12.4°C | 26.2°C | 8.1°C | 208 mm | 70% | 2.7 m/s | 3.7 |
| 2006 | 20.3°C | 16.4°C | 12.5°C | 27.2°C | 9.1°C | 149 mm | 70% | 2.9 m/s | 4.2 |
| 2005 | 19.1°C | 15.4°C | 11.7°C | 23.4°C | 6.5°C | 20 mm | 72% | 2.8 m/s | 4.3 |
| 2004 | 21.7°C | 16.7°C | 11.6°C | 28.2°C | 8.2°C | 23 mm | 59% | 2.6 m/s | 4.5 |
| 2003 | 20.6°C | 16.4°C | 12.2°C | 27.2°C | 8.3°C | 13 mm | 69% | 2.8 m/s | 4.1 |
| 2002 | 20.5°C | 16.4°C | 12.3°C | 26.7°C | 8.7°C | 94 mm | 67% | 3 m/s | 4 |
| 2001 | 20.0°C | 15.5°C | 10.9°C | 23.5°C | 7.6°C | 21 mm | 65% | 2.5 m/s | 4.2 |
| 2000 | 20.3°C | 15.9°C | 11.6°C | 24.2°C | 8.1°C | 37 mm | 64% | 2.6 m/s | 4.2 |
| 1999 | 18.4°C | 15.2°C | 12.0°C | 23.0°C | 8.4°C | 102 mm | 79% | 2.6 m/s | 4.1 |
| 1998 | 19.8°C | 16.7°C | 13.6°C | 23.9°C | 8.9°C | 87 mm | 77% | 2.9 m/s | 3.6 |
| 1997 | 19.8°C | 15.4°C | 11.1°C | 23.5°C | 6.5°C | 12 mm | 67% | 2.6 m/s | 4.6 |
| 1996 | 19.0°C | 14.8°C | 10.5°C | 23.6°C | 7.5°C | 41 mm | 75% | 2.2 m/s | 4.2 |
| 1995 | 21.0°C | 16.4°C | 11.9°C | 28.2°C | 6.2°C | 18 mm | 67% | 2.6 m/s | 4.4 |
| 1994 | 19.2°C | 15.2°C | 11.2°C | 23.3°C | 7.1°C | 27 mm | 67% | 2.4 m/s | 4.4 |
| 1993 | 19.7°C | 15.8°C | 12.0°C | 24.9°C | 8.3°C | 34 mm | 70% | 2.2 m/s | 4.3 |
| 1992 | 20.3°C | 15.7°C | 11.0°C | 25.3°C | 7.6°C | 15 mm | 64% | 2.8 m/s | 4.4 |
| 1991 | 20.5°C | 15.4°C | 10.2°C | 26.0°C | 7.0°C | 1 mm | 64% | 2.5 m/s | 4.7 |
| 1990 ❄️ | 17.6°C | 13.4°C | 9.1°C | 20.6°C | 6.1°C | 12 mm | 71% | 2.7 m/s | 4.3 |
| 1989 | 17.3°C | 13.5°C | 9.6°C | 21.7°C | 6.7°C | 38 mm | 73% | 2.3 m/s | 4.6 |
| 1988 | 18.9°C | 15.3°C | 11.7°C | 23.3°C | 6.3°C | 38 mm | 78% | 2.6 m/s | 4.1 |
| 1987 | 18.9°C | 15.5°C | 12.1°C | 21.7°C | 8.1°C | 155 mm | 80% | 2.4 m/s | 3.8 |
| 1986 | 19.2°C | 14.9°C | 10.6°C | 24.0°C | 7.7°C | 37 mm | 67% | 2.6 m/s | 4.1 |
| 1985 | 17.9°C | 14.2°C | 10.4°C | 23.5°C | 6.3°C | 31 mm | 75% | 2.3 m/s | 4 |
| 1984 | 19.0°C | 14.3°C | 9.7°C | 22.2°C | 7.0°C | 11 mm | 71% | 2.3 m/s | 4.5 |
| 1983 | 17.8°C | 14.6°C | 11.3°C | 20.6°C | 8.0°C | 69 mm | 76% | 2.3 m/s | — |
| 1982 | 20.0°C | 16.1°C | 12.2°C | 24.2°C | 7.3°C | 70 mm | 69% | 2.1 m/s | — |
| 1981 | 19.8°C | 14.7°C | 9.6°C | 23.9°C | 7.3°C | 31 mm | 62% | 2.5 m/s | — |
Actual recorded August data for each year, 1981–2025 — sourced from NASA POWER.
The average high in August is around 19.9°C with lows near 11.5°C (mean 15.7°C), based on 45 years of NASA POWER data.
August averages 53 mm of rainfall in Grafton, one of the drier months. The wettest on record was 208 mm in 2007.
The hottest August reached 30°C in 2024. The coldest dipped to 6.1°C in 1990.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average August temperatures have risen by about 2°C. Daytime highs moved from 18.9°C to 20.7°C and overnight lows from 10.6°C to 12.9°C over the same span.
August is one of the cooler months of the year in Grafton and one of the drier months, so plan for around 19.9°C daytime highs and 11.5°C at night.
Not quite — August is the 3rd coolest month in Grafton, averaging 15.7°C.
For August in Grafton, pack light layers you can adjust through the day, with typical highs of 19.9°C and lows of 11.5°C. Bring an umbrella or light rain jacket too.
Relative humidity in August averages 70% — moderately humid.
Average wind speed in August is 2.5 m/s. The windiest August on record averaged 3 m/s (2002).
The wettest August on record was 2007 with 208 mm. On average, August sees 53 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 Grafton 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.
