July is one of the cooler months of the year in Hamilton, with average highs near 12.8°C and lows around 7.3°C (mean 10.1°C). It is a relatively wet time of year, averaging 125 mm of rainfall and 86% relative humidity across the period.
July is one of the cooler months of the year in Hamilton. Across 45 years of records, the warmest July in Hamilton was 1998 — when the month averaged 12°C — while the coldest was 1983 at 8.6°C. Typical July days reach 12.8°C with nights near 7.3°C. The long-term trend is warming, about 0.2°C per decade.
July is a relatively wet time of year in Hamilton, averaging 125 mm of rainfall. The wettest July on record was 2025 with 251 mm, while the driest was 1993 at 41 mm.
Relative humidity in Hamilton during July averages 86%. The most humid Julys were 2005 and 2017 at 89%, and the least humid was 1982 at 83%.
July receives about 2.1 kWh/m²/day of solar energy in Hamilton. The sunniest July was 1989 at 2.4 kWh/m²/day, and the cloudiest were 1998, 2007 and 2008, among others at 1.8.
Average wind speed in Hamilton during July is 4.1 m/s. The windiest Julys were 2011, 2016 and 2023, among others at 5 m/s, while the calmest was 1993 at 2.8 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 9.8°C | 9.9°C | 10.0°C | 10.1°C | 10.9°C | +1.1°C |
| Avg High | 12.6°C | 12.6°C | 12.9°C | 12.9°C | 13.6°C | +1°C |
| Avg Low | 7.0°C | 7.3°C | 7.2°C | 7.4°C | 8.3°C | +1.3°C |
| Avg Rain | 114 mm | 136 mm | 113 mm | 115 mm | 158 mm | +45 mm |
July temperatures in Hamilton have risen by about 1.1°C between 1981–1985 and 2021–2025.
July has ranged from a record low of 0.7°C (1982) to a record high of 17.7°C (1998).
Rainfall in July is a relatively wet time of year, averaging 125 mm, with a wettest year of 251 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, July — with days averaging 12.8°C and nights around 7.3°C (mean 10.1°C) and higher rainfall (125 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 🌧️ | 13.7°C | 10.8°C | 7.8°C | 17.7°C | 2.4°C | 251 mm | 87% | 3.7 m/s | 2.1 |
| 2024 | 13.5°C | 10.5°C | 7.5°C | 15.5°C | 2.4°C | 132 mm | 88% | 3.3 m/s | 2.1 |
| 2023 | 13.2°C | 11.0°C | 8.8°C | 15.2°C | 3.8°C | 87 mm | 86% | 5 m/s | 2.1 |
| 2022 | 14.0°C | 11.8°C | 9.5°C | 17.0°C | 4.3°C | 234 mm | 87% | 4.9 m/s | 2 |
| 2021 | 13.5°C | 10.7°C | 7.9°C | 16.1°C | 2.4°C | 128 mm | 86% | 4.1 m/s | 2.2 |
| 2020 | 13.4°C | 10.8°C | 8.1°C | 16.8°C | 4.6°C | 118 mm | 86% | 4.3 m/s | 2 |
| 2019 | 14.1°C | 11.4°C | 8.8°C | 17.3°C | 4.7°C | 152 mm | 88% | 3.9 m/s | 2 |
| 2018 | 13.1°C | 10.6°C | 8.1°C | 15.1°C | 3.3°C | 132 mm | 87% | 3.8 m/s | 2.1 |
| 2017 | 12.3°C | 9.9°C | 7.4°C | 16.5°C | 2.3°C | 165 mm | 89% | 3.9 m/s | 2 |
| 2016 | 13.2°C | 10.5°C | 7.7°C | 15.9°C | 3.0°C | 132 mm | 83% | 5 m/s | 2.1 |
| 2015 | 12.3°C | 9.3°C | 6.3°C | 14.5°C | 1.1°C | 128 mm | 87% | 4.1 m/s | 2.2 |
| 2014 | 12.6°C | 9.6°C | 6.6°C | 16.2°C | 2.5°C | 51 mm | 84% | 4.4 m/s | 2.2 |
| 2013 | 13.1°C | 10.5°C | 7.9°C | 16.3°C | 3.5°C | 51 mm | 86% | 3.1 m/s | 2.1 |
| 2012 | 13.1°C | 9.9°C | 6.8°C | 15.1°C | 2.2°C | 171 mm | 87% | 3.7 m/s | 2 |
| 2011 | 12.7°C | 10.1°C | 7.6°C | 16.2°C | 2.3°C | 109 mm | 85% | 5 m/s | 2.1 |
| 2010 | 12.6°C | 9.5°C | 6.3°C | 14.9°C | 1.5°C | 58 mm | 86% | 3.4 m/s | 2.2 |
| 2009 | 12.4°C | 9.4°C | 6.4°C | 14.5°C | 2.0°C | 116 mm | 86% | 4 m/s | 2.1 |
| 2008 | 12.8°C | 10.4°C | 8.0°C | 16.3°C | 3.0°C | 200 mm | 88% | 5 m/s | 1.8 |
| 2007 | 13.2°C | 10.5°C | 7.8°C | 15.6°C | 2.7°C | 161 mm | 88% | 4.3 m/s | 1.8 |
| 2006 | 13.0°C | 9.8°C | 6.6°C | 15.3°C | 1.3°C | 89 mm | 86% | 3.6 m/s | 2.2 |
| 2005 | 13.1°C | 10.7°C | 8.3°C | 15.4°C | 3.7°C | 139 mm | 89% | 4.2 m/s | 1.9 |
| 2004 | 12.3°C | 9.2°C | 6.1°C | 14.2°C | 1.7°C | 105 mm | 86% | 4 m/s | 2.3 |
| 2003 | 12.4°C | 9.3°C | 6.1°C | 14.8°C | 2.1°C | 91 mm | 84% | 3.8 m/s | 2.2 |
| 2002 | 13.1°C | 10.5°C | 7.9°C | 15.6°C | 4.1°C | 102 mm | 85% | 4.7 m/s | 2 |
| 2001 | 12.2°C | 9.0°C | 5.7°C | 15.1°C | 1.2°C | 57 mm | 84% | 3.4 m/s | 2.1 |
| 2000 | 14.6°C | 11.6°C | 8.7°C | 16.3°C | 4.0°C | 68 mm | 83% | 4.9 m/s | 2 |
| 1999 | 13.2°C | 10.4°C | 7.6°C | 16.7°C | 3.1°C | 83 mm | 86% | 3.8 m/s | 2 |
| 1998 🔥 | 14.6°C | 12.0°C | 9.3°C | 17.7°C | 4.8°C | 207 mm | 88% | 4.5 m/s | 1.8 |
| 1997 | 12.0°C | 9.2°C | 6.5°C | 14.6°C | 2.2°C | 43 mm | 84% | 3.3 m/s | 2.1 |
| 1996 | 12.8°C | 9.9°C | 7.1°C | 15.6°C | 1.3°C | 158 mm | 88% | 3.8 m/s | 1.9 |
| 1995 | 11.7°C | 9.5°C | 7.3°C | 14.4°C | 2.2°C | 179 mm | 86% | 4.8 m/s | 1.9 |
| 1994 | 11.7°C | 9.3°C | 7.0°C | 14.5°C | 0.8°C | 107 mm | 86% | 4.7 m/s | 2.1 |
| 1993 | 12.4°C | 9.2°C | 6.0°C | 14.9°C | 1.6°C | 41 mm | 87% | 2.8 m/s | 2 |
| 1992 | 12.5°C | 10.0°C | 7.6°C | 16.2°C | 3.3°C | 226 mm | 89% | 5 m/s | 2 |
| 1991 | 11.9°C | 9.1°C | 6.2°C | 13.9°C | 1.5°C | 146 mm | 86% | 3.6 m/s | 2.1 |
| 1990 | 12.7°C | 10.3°C | 7.9°C | 15.0°C | 2.9°C | 170 mm | 88% | 4.1 m/s | 2 |
| 1989 | 12.4°C | 9.2°C | 5.9°C | 15.4°C | 1.3°C | 127 mm | 83% | 3 m/s | 2.4 |
| 1988 | 12.9°C | 10.7°C | 8.5°C | 16.4°C | 3.2°C | 169 mm | 86% | 4.9 m/s | 2 |
| 1987 | 12.2°C | 9.6°C | 7.0°C | 14.1°C | 3.6°C | 81 mm | 85% | 3.9 m/s | 2.1 |
| 1986 | 12.0°C | 9.2°C | 6.3°C | 14.3°C | 1.3°C | 134 mm | 83% | 4.2 m/s | 2.3 |
| 1985 | 13.3°C | 11.1°C | 9.0°C | 16.0°C | 5.8°C | 139 mm | 87% | 4.2 m/s | 2 |
| 1984 | 13.5°C | 10.5°C | 7.6°C | 16.4°C | 2.4°C | 121 mm | 89% | 3.7 m/s | 1.8 |
| 1983 ❄️ | 12.1°C | 8.6°C | 5.1°C | 15.7°C | 1.4°C | 43 mm | 85% | 3.3 m/s | — |
| 1982 | 12.2°C | 9.1°C | 6.1°C | 15.0°C | 0.7°C | 73 mm | 83% | 4.2 m/s | — |
| 1981 | 12.6°C | 10.0°C | 7.4°C | 15.8°C | 1.8°C | 136 mm | 87% | 4.3 m/s | — |
Actual recorded July data for each year, 1981–2025 — sourced from NASA POWER.
The average high in July is around 12.8°C with lows near 7.3°C (mean 10.1°C), based on 45 years of NASA POWER data.
July averages 125 mm of rainfall in Hamilton, a relatively wet time of year. The wettest on record was 251 mm in 2025.
The hottest July reached 17.7°C in 1998. The coldest dipped to 0.7°C in 1982.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average July temperatures have risen by about 1.1°C. Daytime highs moved from 12.7°C to 13.6°C and overnight lows from 7°C to 8.3°C over the same span.
July is one of the cooler months of the year in Hamilton and a relatively wet time of year, so plan for around 12.8°C daytime highs and 7.3°C at night.
Yes — July is the coldest month of the year in Hamilton, averaging 10.1°C.
For July in Hamilton, pack warm layers and a jacket for chilly mornings, with typical highs of 12.8°C and lows of 7.3°C. Bring an umbrella or light rain jacket too.
Relative humidity in July averages 86% — quite humid.
Average wind speed in July is 4.1 m/s. The windiest July on record averaged 5 m/s (1992).
The wettest July on record was 2025 with 251 mm. On average, July sees 125 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 July, 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 July specifically, along with year-by-year records and how the month has changed over the decades.
