August is one of the cooler months of the year in Greymouth, with average highs near 10.2°C and lows around 5.5°C (mean 7.9°C). It is about average for rainfall, averaging 172 mm of rainfall and 86% relative humidity across the period.
August is one of the cooler months of the year in Greymouth. Across 45 years of records, the warmest August in Greymouth was 2013 — when the month averaged 9.3°C — while the coldest was 1992 at 6.1°C. Typical August days reach 10.2°C with nights near 5.5°C. The long-term trend is warming, about 0.2°C per decade.
August is about average for rainfall in Greymouth, averaging 172 mm of rainfall. The wettest August on record was 1992 with 465 mm, while the driest was 2011 at 44 mm.
Relative humidity in Greymouth during August averages 86%. The most humid August was 1994 at 91%, and the least humid was 1986 at 80%.
August receives about 2.2 kWh/m²/day of solar energy in Greymouth. The sunniest August was 2025 at 2.7 kWh/m²/day, and the cloudiest was 1991 at 1.9.
Average wind speed in Greymouth during August is 1.3 m/s. The windiest Augusts were 1991 and 1992 at 1.6 m/s, while the calmest were 1987 and 2023 at 1.1 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 7.9°C | 7.3°C | 7.9°C | 8.1°C | 8.4°C | +0.5°C |
| Avg High | 10.4°C | 9.6°C | 10.2°C | 10.5°C | 10.7°C | +0.3°C |
| Avg Low | 5.4°C | 5.0°C | 5.5°C | 5.8°C | 6.1°C | +0.7°C |
| Avg Rain | 134 mm | 216 mm | 145 mm | 165 mm | 209 mm | +76 mm |
August temperatures in Greymouth have risen by about 0.4°C between 1981–1985 and 2021–2025.
August has ranged from a record low of -1.2°C (2016) to a record high of 14.8°C (1991).
Rainfall in August is about average for rainfall, averaging 172 mm, with a wettest year of 465 mm.
A quieter season to visit Greymouth
If your dates are flexible, the more temperate months of February and January tend to be the most comfortable for visiting Greymouth. That said, August — with days averaging 10.2°C and nights around 5.5°C (mean 7.9°C) and higher rainfall (172 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 | 10.6°C | 7.9°C | 5.1°C | 12.7°C | 2.0°C | 107 mm | 83% | 1.2 m/s | 2.7 |
| 2024 | 10.5°C | 8.4°C | 6.3°C | 12.9°C | 1.3°C | 283 mm | 89% | 1.3 m/s | 2.1 |
| 2023 | 10.0°C | 7.5°C | 5.1°C | 12.4°C | 1.4°C | 148 mm | 85% | 1.1 m/s | 2.5 |
| 2022 | 11.3°C | 9.0°C | 6.7°C | 14.2°C | 0.8°C | 305 mm | 88% | 1.3 m/s | 2.1 |
| 2021 | 10.3°C | 8.2°C | 6.0°C | 13.1°C | 1.2°C | 230 mm | 89% | 1.5 m/s | 2.2 |
| 2020 | 11.2°C | 9.2°C | 7.2°C | 13.4°C | 1.7°C | 184 mm | 89% | 1.3 m/s | 2.3 |
| 2019 | 9.7°C | 7.6°C | 5.6°C | 13.3°C | 1.6°C | 249 mm | 89% | 1.5 m/s | 2.1 |
| 2018 | 11.0°C | 8.8°C | 6.6°C | 13.5°C | 3.2°C | 169 mm | 88% | 1.2 m/s | 2.3 |
| 2017 | 11.3°C | 8.9°C | 6.4°C | 14.0°C | 1.7°C | 225 mm | 88% | 1.3 m/s | 2.2 |
| 2016 | 9.6°C | 7.1°C | 4.7°C | 14.0°C | -1.2°C | 97 mm | 87% | 1.2 m/s | 2.3 |
| 2015 | 9.7°C | 7.3°C | 5.0°C | 13.4°C | -0.1°C | 274 mm | 88% | 1.3 m/s | 2.2 |
| 2014 | 10.6°C | 7.8°C | 4.9°C | 13.9°C | 2.2°C | 91 mm | 83% | 1.3 m/s | 2.5 |
| 2013 🔥 | 11.5°C | 9.3°C | 7.2°C | 13.8°C | 2.4°C | 151 mm | 88% | 1.3 m/s | 2.1 |
| 2012 | 10.7°C | 8.5°C | 6.4°C | 13.3°C | 3.2°C | 121 mm | 87% | 1.2 m/s | 2.3 |
| 2011 | 9.8°C | 7.5°C | 5.2°C | 12.7°C | -0.1°C | 44 mm | 86% | 1.2 m/s | 2.2 |
| 2010 | 11.0°C | 8.5°C | 6.0°C | 13.8°C | 1.7°C | 230 mm | 86% | 1.2 m/s | 2.3 |
| 2009 | 11.4°C | 9.2°C | 7.1°C | 14.3°C | 3.9°C | 267 mm | 89% | 1.5 m/s | 2 |
| 2008 | 9.3°C | 7.0°C | 4.8°C | 13.4°C | 0.0°C | 109 mm | 87% | 1.3 m/s | 2 |
| 2007 | 9.8°C | 7.8°C | 5.8°C | 12.4°C | 0.6°C | 119 mm | 88% | 1.3 m/s | 2.1 |
| 2006 | 9.3°C | 7.1°C | 4.8°C | 12.3°C | 0.2°C | 125 mm | 86% | 1.3 m/s | 2.3 |
| 2005 | 11.1°C | 9.1°C | 7.0°C | 14.3°C | 4.3°C | 135 mm | 89% | 1.2 m/s | 2.3 |
| 2004 | 8.8°C | 6.2°C | 3.6°C | 11.6°C | -0.5°C | 127 mm | 83% | 1.5 m/s | 2.3 |
| 2003 | 10.6°C | 7.9°C | 5.1°C | 12.7°C | 1.8°C | 130 mm | 84% | 1.3 m/s | 2.3 |
| 2002 | 10.5°C | 8.0°C | 5.6°C | 13.3°C | 2.2°C | 123 mm | 86% | 1.3 m/s | 2.3 |
| 2001 | 10.8°C | 8.4°C | 6.0°C | 13.1°C | -0.5°C | 168 mm | 86% | 1.3 m/s | 2.2 |
| 2000 | 10.5°C | 7.9°C | 5.3°C | 13.2°C | 0.8°C | 143 mm | 84% | 1.3 m/s | 2.1 |
| 1999 | 10.4°C | 7.8°C | 5.3°C | 12.9°C | 1.4°C | 134 mm | 86% | 1.4 m/s | 2.2 |
| 1998 | 10.1°C | 7.6°C | 5.1°C | 14.1°C | 1.6°C | 155 mm | 83% | 1.4 m/s | 2.3 |
| 1997 | 9.6°C | 7.2°C | 4.9°C | 11.8°C | 0.8°C | 142 mm | 85% | 1.5 m/s | 2.2 |
| 1996 | 9.1°C | 6.7°C | 4.2°C | 11.6°C | 0.2°C | 220 mm | 86% | 1.4 m/s | 2.2 |
| 1995 | 9.5°C | 7.1°C | 4.6°C | 11.8°C | 0.0°C | 304 mm | 86% | 1.5 m/s | 2.2 |
| 1994 | 9.2°C | 7.5°C | 5.8°C | 11.5°C | 1.4°C | 230 mm | 91% | 1.4 m/s | 2.1 |
| 1993 | 9.5°C | 6.8°C | 4.1°C | 12.2°C | 0.4°C | 82 mm | 83% | 1.3 m/s | 2.4 |
| 1992 ❄️ 🌧️ | 8.3°C | 6.1°C | 3.8°C | 11.3°C | -0.9°C | 465 mm | 88% | 1.6 m/s | 2.2 |
| 1991 | 10.2°C | 8.3°C | 6.3°C | 14.8°C | 2.6°C | 267 mm | 89% | 1.6 m/s | 1.9 |
| 1990 | 10.3°C | 7.9°C | 5.6°C | 13.2°C | 1.9°C | 164 mm | 84% | 1.3 m/s | 2.1 |
| 1989 | 11.6°C | 8.7°C | 5.7°C | 14.4°C | 1.9°C | 149 mm | 82% | 1.3 m/s | 2.4 |
| 1988 | 10.0°C | 8.0°C | 5.9°C | 12.7°C | 0.8°C | 167 mm | 86% | 1.4 m/s | 2 |
| 1987 | 11.0°C | 9.0°C | 7.0°C | 14.5°C | 4.3°C | 157 mm | 90% | 1.1 m/s | 2.1 |
| 1986 | 9.6°C | 6.9°C | 4.1°C | 12.5°C | 0.5°C | 77 mm | 80% | 1.3 m/s | 2.4 |
| 1985 | 10.4°C | 7.7°C | 5.0°C | 12.4°C | 0.7°C | 162 mm | 85% | 1.4 m/s | 2.4 |
| 1984 | 11.3°C | 8.5°C | 5.7°C | 14.4°C | 0.4°C | 141 mm | 84% | 1.4 m/s | 2.3 |
| 1983 | 10.7°C | 8.1°C | 5.5°C | 13.3°C | 1.6°C | 128 mm | 86% | 1.2 m/s | — |
| 1982 | 10.0°C | 8.0°C | 6.1°C | 12.3°C | 2.2°C | 124 mm | 88% | 1.4 m/s | — |
| 1981 | 9.4°C | 6.6°C | 3.9°C | 11.4°C | 1.1°C | 97 mm | 82% | 1.2 m/s | — |
Actual recorded August data for each year, 1981–2025 — sourced from NASA POWER.
The average high in August is around 10.2°C with lows near 5.5°C (mean 7.9°C), based on 45 years of NASA POWER data.
August averages 172 mm of rainfall in Greymouth, about average for rainfall. The wettest on record was 465 mm in 1992.
The hottest August reached 14.8°C in 1991. The coldest dipped to -1.2°C in 2016.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average August temperatures have risen by about 0.4°C. Daytime highs moved from 10.4°C to 10.5°C and overnight lows from 5.2°C to 5.8°C over the same span.
August is one of the cooler months of the year in Greymouth and about average for rainfall, so plan for around 10.2°C daytime highs and 5.5°C at night.
Not quite — August is the 2nd coolest month in Greymouth, averaging 7.9°C.
For August in Greymouth, pack warm layers and a jacket for chilly mornings, with typical highs of 10.2°C and lows of 5.5°C. Bring an umbrella or light rain jacket too.
Relative humidity in August averages 86% — quite humid.
Average wind speed in August is 1.3 m/s. The windiest August on record averaged 1.6 m/s (1991).
The wettest August on record was 1992 with 465 mm. On average, August sees 172 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 Greymouth 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.
