August is one of the cooler months of the year in Hamilton, with average highs near 13.4°C and lows around 7.5°C (mean 10.5°C). It is a relatively wet time of year, averaging 110 mm of rainfall and 85% relative humidity across the period.
August is one of the cooler months of the year in Hamilton. Across 45 years of records, the warmest August in Hamilton was 2022 — when the month averaged 11.7°C — while the coldest was 2004 at 8.9°C. Typical August days reach 13.4°C with nights near 7.5°C. The long-term August temperature trend is broadly flat.
August is a relatively wet time of year in Hamilton, averaging 110 mm of rainfall. The wettest August on record was 1992 with 229 mm, while the driest was 1982 at 37 mm.
Relative humidity in Hamilton during August averages 85%. The most humid August was 2010 at 88%, and the least humid was 2014 at 82%.
August receives about 2.8 kWh/m²/day of solar energy in Hamilton. The sunniest Augusts were 2005, 2023 and 2025 at 3.1 kWh/m²/day, and the cloudiest was 2010 at 2.4.
Average wind speed in Hamilton during August is 4 m/s. The windiest August was 1992 at 5.2 m/s, while the calmest was 1987 at 2.9 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 10.4°C | 10.1°C | 10.6°C | 10.7°C | 10.7°C | +0.3°C |
| Avg High | 13.4°C | 12.9°C | 13.5°C | 13.7°C | 13.8°C | +0.4°C |
| Avg Low | 7.4°C | 7.2°C | 7.6°C | 7.8°C | 7.6°C | +0.2°C |
| Avg Rain | 96 mm | 128 mm | 87 mm | 122 mm | 117 mm | +21 mm |
August temperatures in Hamilton have risen by about 0.3°C between 1981–1985 and 2021–2025.
August has ranged from a record low of 1.3°C (1992) to a record high of 18.1°C (1989).
Rainfall in August is a relatively wet time of year, averaging 110 mm, with a wettest year of 229 mm.
A quieter season to visit Hamilton
If your dates are flexible, the more temperate months of February and January tend to be the most comfortable for visiting Hamilton. That said, August — with days averaging 13.4°C and nights around 7.5°C (mean 10.5°C) and higher rainfall (110 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 | 13.3°C | 9.9°C | 6.6°C | 16.4°C | 2.9°C | 112 mm | 84% | 3.9 m/s | 3.1 |
| 2024 | 13.9°C | 11.1°C | 8.2°C | 17.7°C | 3.4°C | 118 mm | 86% | 3.9 m/s | 2.7 |
| 2023 | 12.9°C | 9.7°C | 6.6°C | 15.2°C | 2.4°C | 90 mm | 84% | 3.4 m/s | 3.1 |
| 2022 🔥 | 14.8°C | 11.7°C | 8.6°C | 17.1°C | 2.8°C | 144 mm | 85% | 3.6 m/s | 2.8 |
| 2021 | 13.6°C | 10.6°C | 7.7°C | 16.0°C | 3.0°C | 120 mm | 85% | 4.2 m/s | 2.7 |
| 2020 | 14.1°C | 11.1°C | 8.1°C | 16.5°C | 2.3°C | 119 mm | 86% | 4 m/s | 2.8 |
| 2019 | 13.3°C | 11.0°C | 8.7°C | 15.4°C | 2.0°C | 135 mm | 84% | 5 m/s | 2.8 |
| 2018 | 14.0°C | 11.1°C | 8.2°C | 16.2°C | 5.1°C | 123 mm | 86% | 3.4 m/s | 2.7 |
| 2017 | 14.2°C | 11.3°C | 8.3°C | 16.5°C | 2.9°C | 174 mm | 87% | 3.6 m/s | 2.7 |
| 2016 | 13.7°C | 10.3°C | 6.9°C | 17.0°C | 1.9°C | 84 mm | 84% | 3.5 m/s | 2.9 |
| 2015 | 13.1°C | 10.1°C | 7.0°C | 16.0°C | 1.4°C | 152 mm | 87% | 3.7 m/s | 2.8 |
| 2014 | 13.4°C | 9.9°C | 6.5°C | 17.5°C | 2.2°C | 94 mm | 82% | 4.2 m/s | 2.9 |
| 2013 | 14.3°C | 11.6°C | 8.9°C | 17.0°C | 4.8°C | 97 mm | 86% | 3.9 m/s | 2.6 |
| 2012 | 13.9°C | 10.9°C | 7.9°C | 16.3°C | 3.4°C | 115 mm | 86% | 3.3 m/s | 2.8 |
| 2011 | 12.9°C | 9.6°C | 6.4°C | 16.7°C | 1.3°C | 51 mm | 85% | 3.4 m/s | 3 |
| 2010 | 13.7°C | 11.2°C | 8.7°C | 15.9°C | 4.0°C | 194 mm | 88% | 3.9 m/s | 2.4 |
| 2009 | 14.6°C | 11.6°C | 8.6°C | 18.0°C | 4.0°C | 88 mm | 86% | 4.4 m/s | 2.6 |
| 2008 | 13.0°C | 10.4°C | 7.8°C | 15.7°C | 1.3°C | 159 mm | 85% | 4.5 m/s | 2.7 |
| 2007 | 13.3°C | 10.9°C | 8.5°C | 15.3°C | 3.4°C | 97 mm | 84% | 4.6 m/s | 2.7 |
| 2006 | 13.0°C | 10.2°C | 7.4°C | 15.4°C | 2.7°C | 136 mm | 85% | 3.8 m/s | 2.8 |
| 2005 | 14.7°C | 11.1°C | 7.4°C | 17.7°C | 3.3°C | 43 mm | 83% | 3 m/s | 3.1 |
| 2004 ❄️ | 12.0°C | 8.9°C | 5.9°C | 15.1°C | 1.5°C | 77 mm | 83% | 4.4 m/s | 3 |
| 2003 | 14.1°C | 10.8°C | 7.6°C | 16.6°C | 3.9°C | 57 mm | 84% | 3.7 m/s | 2.8 |
| 2002 | 13.4°C | 10.4°C | 7.3°C | 15.8°C | 2.9°C | 58 mm | 84% | 4.5 m/s | 2.8 |
| 2001 | 13.7°C | 10.7°C | 7.8°C | 16.7°C | 3.6°C | 71 mm | 86% | 4.3 m/s | 2.6 |
| 2000 | 13.6°C | 10.5°C | 7.3°C | 15.7°C | 2.5°C | 81 mm | 83% | 3.6 m/s | 2.8 |
| 1999 | 13.4°C | 10.1°C | 6.8°C | 16.6°C | 2.7°C | 97 mm | 83% | 3.9 m/s | 2.8 |
| 1998 | 13.4°C | 10.5°C | 7.5°C | 16.1°C | 2.7°C | 78 mm | 83% | 4.1 m/s | 2.7 |
| 1997 | 12.9°C | 9.7°C | 6.5°C | 16.0°C | 2.8°C | 63 mm | 84% | 4.5 m/s | 2.7 |
| 1996 | 12.5°C | 9.9°C | 7.3°C | 16.5°C | 1.5°C | 154 mm | 84% | 4.7 m/s | 2.5 |
| 1995 | 12.6°C | 9.4°C | 6.2°C | 14.6°C | 1.4°C | 114 mm | 85% | 4.1 m/s | 2.8 |
| 1994 | 12.8°C | 10.2°C | 7.6°C | 14.8°C | 3.6°C | 117 mm | 86% | 3.8 m/s | 2.9 |
| 1993 | 12.6°C | 9.5°C | 6.4°C | 14.9°C | 2.7°C | 70 mm | 83% | 3.9 m/s | 2.8 |
| 1992 🌧️ | 11.6°C | 9.3°C | 7.0°C | 15.0°C | 1.3°C | 229 mm | 85% | 5.2 m/s | 2.7 |
| 1991 | 13.3°C | 11.0°C | 8.7°C | 16.9°C | 4.1°C | 173 mm | 87% | 4.8 m/s | 2.6 |
| 1990 | 13.6°C | 10.9°C | 8.2°C | 16.0°C | 3.8°C | 182 mm | 84% | 4.1 m/s | 2.7 |
| 1989 | 13.6°C | 10.4°C | 7.1°C | 18.1°C | 1.4°C | 86 mm | 84% | 4.7 m/s | 2.9 |
| 1988 | 13.6°C | 10.9°C | 8.2°C | 16.0°C | 4.8°C | 128 mm | 86% | 4.4 m/s | 2.6 |
| 1987 | 14.6°C | 11.4°C | 8.3°C | 17.6°C | 5.1°C | 70 mm | 85% | 2.9 m/s | 2.8 |
| 1986 | 12.9°C | 9.7°C | 6.6°C | 16.5°C | 2.4°C | 156 mm | 82% | 3.5 m/s | 2.9 |
| 1985 | 13.1°C | 9.9°C | 6.8°C | 15.1°C | 2.2°C | 93 mm | 84% | 4.1 m/s | 3 |
| 1984 | 13.6°C | 11.0°C | 8.4°C | 16.0°C | 1.8°C | 109 mm | 85% | 4.8 m/s | 2.7 |
| 1983 | 13.4°C | 10.2°C | 7.0°C | 15.9°C | 2.8°C | 58 mm | 85% | 3.7 m/s | — |
| 1982 | 13.4°C | 10.4°C | 7.4°C | 15.8°C | 1.9°C | 37 mm | 84% | 3.7 m/s | — |
| 1981 | 12.6°C | 9.8°C | 7.1°C | 14.8°C | 2.4°C | 129 mm | 85% | 4 m/s | — |
Actual recorded August data for each year, 1981–2025 — sourced from NASA POWER.
The average high in August is around 13.4°C with lows near 7.5°C (mean 10.5°C), based on 45 years of NASA POWER data.
August averages 110 mm of rainfall in Hamilton, a relatively wet time of year. The wettest on record was 229 mm in 1992.
The hottest August reached 18.1°C in 1989. The coldest dipped to 1.3°C in 1992.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average August temperatures have risen by about 0.3°C. Daytime highs moved from 13.2°C to 13.7°C and overnight lows from 7.3°C to 7.5°C over the same span.
August is one of the cooler months of the year in Hamilton and a relatively wet time of year, so plan for around 13.4°C daytime highs and 7.5°C at night.
Not quite — August is the 2nd coolest month in Hamilton, averaging 10.5°C.
For August in Hamilton, pack warm layers and a jacket for chilly mornings, with typical highs of 13.4°C and lows of 7.5°C. Bring an umbrella or light rain jacket too.
Relative humidity in August averages 85% — quite humid.
Average wind speed in August is 4 m/s. The windiest August on record averaged 5.2 m/s (1992).
The wettest August on record was 1992 with 229 mm. On average, August sees 110 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 Hamilton 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.
