July is one of the warmer months of the year in Hamilton, with average highs near 28.4°C and lows around 15.8°C (mean 22.1°C). It is a relatively wet time of year, averaging 73 mm of rainfall and 64% relative humidity across the period.
July is one of the warmer months of the year in Hamilton. Across 45 years of records, the warmest July in Hamilton was 2020 — when the month averaged 25.3°C — while the coldest was 2000 at 18.7°C. Typical July days reach 28.4°C with nights near 15.8°C. The long-term trend is warming, about 0.2°C per decade.
July is a relatively wet time of year in Hamilton, averaging 73 mm of rainfall. The wettest July on record was 1992 with 144 mm, while the driest was 1989 at 26 mm.
Relative humidity in Hamilton during July averages 64%. The most humid July was 2000 at 77%, and the least humid was 1988 at 53%.
July receives about 6 kWh/m²/day of solar energy in Hamilton. The sunniest Julys were 2002, 2011 and 2018 at 6.5 kWh/m²/day, and the cloudiest was 1984 at 5.1.
Average wind speed in Hamilton during July is 2.5 m/s. The windiest July was 1999 at 3 m/s, while the calmest was 2024 at 1.9 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 22.4°C | 21.6°C | 21.3°C | 22.5°C | 23.2°C | +0.8°C |
| Avg High | 29.0°C | 28.0°C | 27.4°C | 28.7°C | 29.5°C | +0.5°C |
| Avg Low | 15.9°C | 15.3°C | 15.3°C | 16.3°C | 16.9°C | +1°C |
| Avg Rain | 56 mm | 73 mm | 84 mm | 77 mm | 76 mm | +20 mm |
July temperatures in Hamilton have risen by about 1.3°C between 1981–1985 and 2021–2025.
July has ranged from a record low of 6.8°C (2001) to a record high of 39.7°C (1988).
Rainfall in July is a relatively wet time of year, averaging 73 mm, with a wettest year of 144 mm.
One of the best times to visit Hamilton
July is one of the best times to visit Hamilton. Expect days averaging 28.4°C and nights around 15.8°C (mean 22.1°C) — warmer than Hamilton's yearly average — with moderate rainfall (73 mm), so conditions are generally comfortable for sightseeing and outdoor plans.
| Year | Avg High | Avg Temp | Avg Low | Hottest Day | Coldest Day | Rainfall | Humidity | Wind | Solar |
|---|---|---|---|---|---|---|---|---|---|
| 2025 | 31.3°C | 24.4°C | 17.5°C | 36.6°C | 11.7°C | 55 mm | 60% | 2.3 m/s | 6.4 |
| 2024 | 28.9°C | 22.8°C | 16.7°C | 33.0°C | 9.8°C | 102 mm | 65% | 1.9 m/s | 6 |
| 2023 | 28.3°C | 22.3°C | 16.2°C | 33.9°C | 12.5°C | 114 mm | 66% | 2.2 m/s | 5.7 |
| 2022 | 29.4°C | 22.8°C | 16.1°C | 34.4°C | 11.3°C | 52 mm | 59% | 2.6 m/s | 6.1 |
| 2021 | 27.4°C | 21.7°C | 15.9°C | 33.5°C | 9.2°C | 79 mm | 68% | 2.6 m/s | 5.2 |
| 2020 🔥 | 31.8°C | 25.3°C | 18.7°C | 36.8°C | 14.9°C | 52 mm | 62% | 2.5 m/s | 6.4 |
| 2019 | 29.8°C | 23.5°C | 17.2°C | 33.3°C | 12.5°C | 70 mm | 67% | 2.3 m/s | 6.3 |
| 2018 | 29.6°C | 23.2°C | 16.8°C | 33.7°C | 10.7°C | 69 mm | 64% | 2.4 m/s | 6.5 |
| 2017 | 26.3°C | 20.8°C | 15.3°C | 30.2°C | 11.7°C | 90 mm | 74% | 2.3 m/s | 5.6 |
| 2016 | 30.2°C | 23.7°C | 17.2°C | 36.1°C | 10.9°C | 55 mm | 60% | 2.7 m/s | 6.2 |
| 2015 | 27.7°C | 21.2°C | 14.8°C | 34.4°C | 9.1°C | 41 mm | 66% | 2.2 m/s | 6.4 |
| 2014 | 25.3°C | 19.5°C | 13.6°C | 31.2°C | 8.7°C | 128 mm | 70% | 2.6 m/s | 5.8 |
| 2013 | 26.5°C | 21.5°C | 16.5°C | 33.5°C | 9.7°C | 110 mm | 75% | 2.2 m/s | 5.8 |
| 2012 | 31.0°C | 24.3°C | 17.6°C | 36.8°C | 14.0°C | 61 mm | 58% | 2.3 m/s | 6.2 |
| 2011 | 31.0°C | 24.2°C | 17.5°C | 36.7°C | 12.2°C | 32 mm | 61% | 2.4 m/s | 6.5 |
| 2010 | 29.5°C | 23.2°C | 16.8°C | 35.7°C | 8.9°C | 109 mm | 65% | 2.4 m/s | 6.2 |
| 2009 | 24.5°C | 18.8°C | 13.1°C | 27.6°C | 8.6°C | 87 mm | 71% | 2.4 m/s | 5.4 |
| 2008 | 27.8°C | 21.8°C | 15.8°C | 32.1°C | 10.6°C | 126 mm | 69% | 2.5 m/s | 5.9 |
| 2007 | 28.0°C | 21.6°C | 15.2°C | 34.5°C | 9.0°C | 53 mm | 59% | 2.4 m/s | 5.8 |
| 2006 | 30.2°C | 23.9°C | 17.5°C | 36.3°C | 11.2°C | 105 mm | 65% | 2.8 m/s | 5.8 |
| 2005 | 30.2°C | 23.6°C | 17.0°C | 37.0°C | 10.6°C | 102 mm | 61% | 2.3 m/s | 6.2 |
| 2004 | 25.5°C | 20.0°C | 14.6°C | 31.3°C | 10.3°C | 95 mm | 75% | 2.4 m/s | 5.2 |
| 2003 | 27.4°C | 21.3°C | 15.1°C | 33.0°C | 11.0°C | 76 mm | 66% | 2.7 m/s | 5.5 |
| 2002 | 29.9°C | 23.3°C | 16.7°C | 33.9°C | 11.3°C | 57 mm | 62% | 2.5 m/s | 6.5 |
| 2001 | 26.4°C | 20.1°C | 13.9°C | 33.9°C | 6.8°C | 34 mm | 64% | 2.7 m/s | 6.1 |
| 2000 ❄️ | 23.8°C | 18.7°C | 13.7°C | 27.1°C | 9.1°C | 110 mm | 77% | 2.1 m/s | 5.6 |
| 1999 | 30.9°C | 24.1°C | 17.3°C | 35.4°C | 10.9°C | 50 mm | 59% | 3 m/s | 6.2 |
| 1998 | 28.1°C | 21.7°C | 15.4°C | 33.3°C | 12.2°C | 70 mm | 62% | 2.6 m/s | 6 |
| 1997 | 27.7°C | 21.2°C | 14.7°C | 33.0°C | 9.9°C | 56 mm | 63% | 2.7 m/s | 6.1 |
| 1996 | 27.0°C | 20.4°C | 13.8°C | 31.0°C | 9.3°C | 60 mm | 62% | 2.8 m/s | 6.2 |
| 1995 | 29.3°C | 22.8°C | 16.3°C | 36.8°C | 10.0°C | 39 mm | 63% | 2.7 m/s | 5.7 |
| 1994 | 27.6°C | 21.6°C | 15.6°C | 31.5°C | 9.5°C | 74 mm | 68% | 2.5 m/s | 5.9 |
| 1993 | 28.7°C | 22.4°C | 16.1°C | 32.6°C | 10.5°C | 65 mm | 65% | 2.8 m/s | 6.1 |
| 1992 🌧️ | 24.8°C | 18.8°C | 12.8°C | 30.6°C | 7.9°C | 144 mm | 70% | 2.6 m/s | 5.5 |
| 1991 | 28.4°C | 22.0°C | 15.6°C | 34.7°C | 10.6°C | 97 mm | 63% | 2.6 m/s | 6.2 |
| 1990 | 27.4°C | 21.2°C | 15.0°C | 34.8°C | 10.4°C | 79 mm | 63% | 2.8 m/s | 5.7 |
| 1989 | 29.9°C | 23.2°C | 16.6°C | 34.5°C | 10.3°C | 26 mm | 55% | 2.2 m/s | 6.4 |
| 1988 | 31.7°C | 24.6°C | 17.6°C | 39.7°C | 11.0°C | 91 mm | 53% | 2.3 m/s | 5.8 |
| 1987 | 30.9°C | 24.2°C | 17.5°C | 36.6°C | 9.9°C | 33 mm | 58% | 2.8 m/s | 6.1 |
| 1986 | 28.9°C | 22.4°C | 15.9°C | 33.4°C | 8.4°C | 84 mm | 64% | 2.6 m/s | 6 |
| 1985 | 26.9°C | 20.5°C | 14.2°C | 32.0°C | 9.3°C | 40 mm | 63% | 2.8 m/s | 6.3 |
| 1984 | 26.8°C | 20.6°C | 14.3°C | 32.4°C | 7.4°C | 55 mm | 65% | 2.7 m/s | 5.1 |
| 1983 | 29.3°C | 22.9°C | 16.5°C | 34.2°C | 8.1°C | 58 mm | 64% | 2.8 m/s | — |
| 1982 | 27.2°C | 21.1°C | 15.0°C | 31.9°C | 7.5°C | 52 mm | 67% | 2.4 m/s | — |
| 1981 | 29.0°C | 22.4°C | 15.7°C | 34.8°C | 10.7°C | 64 mm | 59% | 2.5 m/s | — |
Actual recorded July data for each year, 1981–2025 — sourced from NASA POWER.
The average high in July is around 28.4°C with lows near 15.8°C (mean 22.1°C), based on 45 years of NASA POWER data.
July averages 73 mm of rainfall in Hamilton, a relatively wet time of year. The wettest on record was 144 mm in 1992.
The hottest July reached 39.7°C in 1988. The coldest dipped to 6.8°C in 2001.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average July temperatures have risen by about 1.3°C. Daytime highs moved from 27.8°C to 29.1°C and overnight lows from 15.1°C to 16.5°C over the same span.
July is one of the warmer months of the year in Hamilton and a relatively wet time of year, so plan for around 28.4°C daytime highs and 15.8°C at night.
Not quite — July is the 12th coolest month in Hamilton, averaging 22.1°C.
For July in Hamilton, pack light layers you can adjust through the day, with typical highs of 28.4°C and lows of 15.8°C. Bring an umbrella or light rain jacket too.
Relative humidity in July averages 64% — moderately humid.
Average wind speed in July is 2.5 m/s. The windiest July on record averaged 3 m/s (1999).
The wettest July on record was 1992 with 144 mm. On average, July sees 73 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.
