July is one of the cooler months of the year in Hamilton, with average highs near 11.6°C and lows around 4.2°C (mean 7.9°C). It is a relatively wet time of year, averaging 74 mm of rainfall and 88% 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 1999 — when the month averaged 9°C — while the coldest were 1982 and 1986 at 6.8°C. Typical July days reach 11.6°C with nights near 4.2°C. The long-term trend is warming, about 0.2°C per decade.
July is a relatively wet time of year in Hamilton, averaging 74 mm of rainfall. The wettest July on record was 1981 with 128 mm, while the driest was 2022 at 30 mm.
Relative humidity in Hamilton during July averages 88%. The most humid July was 1995 at 92%, and the least humid was 2018 at 82%.
July receives about 2.1 kWh/m²/day of solar energy in Hamilton. The sunniest Julys were 1987, 1992 and 2017, among others at 2.3 kWh/m²/day, and the cloudiest was 1984 at 1.5.
Average wind speed in Hamilton during July is 2.9 m/s. The windiest July was 2018 at 3.5 m/s, while the calmest were 2001 and 2020 at 2.1 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 7.3°C | 7.8°C | 8.1°C | 8.2°C | 8.2°C | +0.9°C |
| Avg High | 11.0°C | 11.5°C | 11.8°C | 11.8°C | 12.1°C | +1.1°C |
| Avg Low | 3.6°C | 4.1°C | 4.4°C | 4.5°C | 4.2°C | +0.6°C |
| Avg Rain | 85 mm | 74 mm | 71 mm | 77 mm | 60 mm | -25 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 -2.7°C (1985) to a record high of 18.3°C (2017).
Rainfall in July is a relatively wet time of year, averaging 74 mm, with a wettest year of 128 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 11.6°C and nights around 4.2°C (mean 7.9°C) and moderate rainfall (74 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 | 12.1°C | 8.3°C | 4.4°C | 15.9°C | 2.0°C | 72 mm | 84% | 3 m/s | 2 |
| 2024 | 12.3°C | 8.1°C | 3.9°C | 16.2°C | -1.0°C | 68 mm | 85% | 2.8 m/s | 2.2 |
| 2023 | 12.6°C | 8.8°C | 5.1°C | 16.0°C | 0.8°C | 43 mm | 88% | 3 m/s | 2.2 |
| 2022 | 12.3°C | 8.3°C | 4.3°C | 17.5°C | -1.4°C | 30 mm | 85% | 2.7 m/s | 2.2 |
| 2021 | 11.2°C | 7.7°C | 4.2°C | 14.7°C | 0.7°C | 106 mm | 89% | 3.3 m/s | 1.9 |
| 2020 | 12.0°C | 7.7°C | 3.3°C | 15.6°C | 0.0°C | 40 mm | 89% | 2.1 m/s | 2.2 |
| 2019 | 12.7°C | 8.9°C | 5.1°C | 16.4°C | 2.1°C | 59 mm | 87% | 3.1 m/s | 2.1 |
| 2018 | 12.1°C | 8.2°C | 4.3°C | 16.8°C | -1.0°C | 70 mm | 82% | 3.5 m/s | 2.1 |
| 2017 | 12.2°C | 8.1°C | 4.0°C | 18.3°C | -0.8°C | 61 mm | 85% | 3 m/s | 2.3 |
| 2016 | 11.8°C | 8.6°C | 5.3°C | 17.8°C | 1.4°C | 80 mm | 89% | 3.3 m/s | 1.9 |
| 2015 | 10.8°C | 6.9°C | 3.1°C | 14.4°C | -2.1°C | 43 mm | 86% | 3.1 m/s | 2 |
| 2014 | 11.3°C | 7.9°C | 4.5°C | 14.5°C | 0.1°C | 92 mm | 92% | 3.2 m/s | 1.9 |
| 2013 | 12.2°C | 8.6°C | 5.1°C | 15.2°C | -0.3°C | 111 mm | 90% | 3 m/s | 1.9 |
| 2012 | 11.7°C | 8.2°C | 4.6°C | 14.1°C | -1.1°C | 88 mm | 91% | 2.5 m/s | 2 |
| 2011 | 11.8°C | 8.2°C | 4.7°C | 16.3°C | -0.3°C | 93 mm | 89% | 3.2 m/s | 2 |
| 2010 | 11.8°C | 8.2°C | 4.6°C | 15.2°C | -0.3°C | 69 mm | 90% | 2.2 m/s | 2 |
| 2009 | 11.6°C | 8.2°C | 4.7°C | 15.0°C | -0.3°C | 93 mm | 89% | 3.2 m/s | 2 |
| 2008 | 11.3°C | 7.5°C | 3.7°C | 14.2°C | -0.8°C | 94 mm | 87% | 3 m/s | 2.1 |
| 2007 | 11.3°C | 7.8°C | 4.3°C | 16.4°C | 0.0°C | 87 mm | 89% | 2.9 m/s | 2.2 |
| 2006 | 11.9°C | 8.0°C | 4.1°C | 14.8°C | -0.4°C | 61 mm | 86% | 2.8 m/s | 2 |
| 2005 | 12.7°C | 8.8°C | 4.9°C | 16.3°C | 1.2°C | 40 mm | 88% | 2.6 m/s | 2 |
| 2004 | 10.7°C | 7.5°C | 4.3°C | 14.1°C | 1.9°C | 68 mm | 89% | 3.1 m/s | 2 |
| 2003 | 12.0°C | 8.0°C | 4.0°C | 15.5°C | 1.2°C | 69 mm | 87% | 3 m/s | 2.1 |
| 2002 | 12.4°C | 8.3°C | 4.2°C | 16.1°C | 0.2°C | 80 mm | 84% | 3.3 m/s | 2.1 |
| 2001 | 12.6°C | 8.8°C | 5.0°C | 14.8°C | 1.5°C | 45 mm | 89% | 2.1 m/s | 2 |
| 2000 | 11.9°C | 8.2°C | 4.5°C | 16.0°C | 0.7°C | 71 mm | 87% | 3 m/s | 2 |
| 1999 🔥 | 13.3°C | 9.0°C | 4.7°C | 16.4°C | 1.0°C | 43 mm | 84% | 2.7 m/s | 2 |
| 1998 | 11.0°C | 7.3°C | 3.6°C | 14.2°C | 0.1°C | 74 mm | 88% | 2.6 m/s | 2.1 |
| 1997 | 11.5°C | 7.2°C | 2.9°C | 15.7°C | 0.1°C | 36 mm | 85% | 2.3 m/s | 2.1 |
| 1996 | 10.9°C | 7.6°C | 4.3°C | 15.8°C | 1.3°C | 122 mm | 91% | 3 m/s | 1.8 |
| 1995 | 10.0°C | 6.9°C | 3.7°C | 12.8°C | 0.2°C | 106 mm | 92% | 2.9 m/s | 1.9 |
| 1994 | 12.1°C | 8.0°C | 3.8°C | 17.5°C | -1.0°C | 57 mm | 86% | 2.7 m/s | 2.2 |
| 1993 | 12.2°C | 8.3°C | 4.4°C | 16.4°C | 1.0°C | 75 mm | 87% | 3 m/s | 2.1 |
| 1992 | 11.5°C | 8.0°C | 4.6°C | 14.3°C | 1.1°C | 77 mm | 89% | 3.2 m/s | 2.3 |
| 1991 | 11.4°C | 8.0°C | 4.5°C | 14.5°C | 1.1°C | 60 mm | 90% | 2.5 m/s | 2.1 |
| 1990 | 11.3°C | 8.1°C | 4.8°C | 15.9°C | 1.5°C | 94 mm | 91% | 3.2 m/s | 2.1 |
| 1989 | 10.5°C | 7.2°C | 3.8°C | 14.6°C | -0.4°C | 93 mm | 91% | 2.9 m/s | 2.1 |
| 1988 | 12.3°C | 8.9°C | 5.6°C | 15.4°C | 2.0°C | 83 mm | 92% | 2.9 m/s | 1.9 |
| 1987 | 11.4°C | 7.5°C | 3.6°C | 15.3°C | 1.1°C | 63 mm | 89% | 2.8 m/s | 2.3 |
| 1986 | 10.2°C | 6.8°C | 3.4°C | 13.4°C | -0.7°C | 110 mm | 92% | 2.8 m/s | 2 |
| 1985 | 11.1°C | 7.2°C | 3.2°C | 17.1°C | -2.7°C | 70 mm | 87% | 2.9 m/s | 2.3 |
| 1984 | 10.4°C | 6.9°C | 3.5°C | 14.0°C | -2.0°C | 111 mm | 91% | 2.7 m/s | 1.5 |
| 1983 | 10.8°C | 7.0°C | 3.2°C | 13.4°C | -2.1°C | 75 mm | 91% | 2.6 m/s | — |
| 1982 ❄️ | 11.2°C | 6.8°C | 2.4°C | 14.6°C | -2.5°C | 35 mm | 86% | 2.3 m/s | — |
| 1981 🌧️ | 11.1°C | 7.5°C | 3.9°C | 14.4°C | 1.2°C | 128 mm | 90% | 3.3 m/s | — |
Actual recorded July data for each year, 1981–2025 — sourced from NASA POWER.
The average high in July is around 11.6°C with lows near 4.2°C (mean 7.9°C), based on 45 years of NASA POWER data.
July averages 74 mm of rainfall in Hamilton, a relatively wet time of year. The wettest on record was 128 mm in 1981.
The hottest July reached 18.3°C in 2017. The coldest dipped to -2.7°C in 1985.
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 10.9°C to 12.1°C and overnight lows from 3.2°C to 4.4°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 11.6°C daytime highs and 4.2°C at night.
Yes — July is the coldest month of the year in Hamilton, averaging 7.9°C.
For July in Hamilton, pack warm layers and a jacket for chilly mornings, with typical highs of 11.6°C and lows of 4.2°C. Bring an umbrella or light rain jacket too.
Relative humidity in July averages 88% — quite humid.
Average wind speed in July is 2.9 m/s. The windiest July on record averaged 3.5 m/s (2018).
The wettest July on record was 1981 with 128 mm. On average, July sees 74 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.
