April is one of the warmer months of the year in Hamilton, with average highs near 20.4°C and lows around 8.7°C (mean 14.6°C). It is one of the drier months, averaging 40 mm of rainfall and 71% relative humidity across the period.
April is one of the warmer months of the year in Hamilton. Across 45 years of records, the warmest April in Hamilton was 2025 — when the month averaged 17.1°C — while the coldest was 1983 at 11.6°C. Typical April days reach 20.4°C with nights near 8.7°C. The long-term trend is warming, about 0.2°C per decade.
April is one of the drier months in Hamilton, averaging 40 mm of rainfall. The wettest April on record was 1995 with 109 mm, while the driest was 1993 at 4 mm.
Relative humidity in Hamilton during April averages 71%. The most humid April was 2011 at 80%, and the least humid was 1993 at 59%.
April receives about 3.5 kWh/m²/day of solar energy in Hamilton. The sunniest Aprils were 1993, 1999 and 2005 at 3.9 kWh/m²/day, and the cloudiest were 2010 and 2020 at 3.
Average wind speed in Hamilton during April is 2.7 m/s. The windiest April was 1986 at 3.3 m/s, while the calmest was 2002 at 2.2 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 14.5°C | 13.8°C | 14.7°C | 14.9°C | 14.7°C | +0.2°C |
| Avg High | 20.5°C | 19.6°C | 20.8°C | 20.7°C | 20.3°C | -0.2°C |
| Avg Low | 8.6°C | 8.0°C | 8.6°C | 9.0°C | 9.2°C | +0.6°C |
| Avg Rain | 37 mm | 43 mm | 40 mm | 40 mm | 38 mm | +1 mm |
April temperatures in Hamilton have risen by about 0.8°C between 1981–1985 and 2021–2025.
April has ranged from a record low of 1°C (2009) to a record high of 34.2°C (1985).
Rainfall in April is one of the drier months, averaging 40 mm, with a wettest year of 109 mm.
A good time to visit Hamilton
April is a good time to visit Hamilton, with days averaging 20.4°C and nights around 8.7°C (mean 14.6°C, close to Hamilton's yearly average) and moderate rainfall. February and January are marginally more temperate, but April still suits most travellers.
| Year | Avg High | Avg Temp | Avg Low | Hottest Day | Coldest Day | Rainfall | Humidity | Wind | Solar |
|---|---|---|---|---|---|---|---|---|---|
| 2025 🔥 | 23.0°C | 17.1°C | 11.3°C | 32.1°C | 5.8°C | 25 mm | 68% | 2.6 m/s | 3.4 |
| 2024 | 18.8°C | 13.4°C | 8.1°C | 25.3°C | 4.7°C | 38 mm | 76% | 2.4 m/s | 3.1 |
| 2023 | 19.8°C | 14.5°C | 9.1°C | 25.4°C | 5.4°C | 48 mm | 77% | 2.5 m/s | 3.2 |
| 2022 | 21.6°C | 15.8°C | 10.0°C | 27.7°C | 5.3°C | 19 mm | 71% | 2.7 m/s | 3.3 |
| 2021 | 20.2°C | 14.4°C | 8.7°C | 32.3°C | 3.7°C | 22 mm | 71% | 2.6 m/s | 3.4 |
| 2020 | 18.3°C | 13.2°C | 8.2°C | 24.5°C | 5.2°C | 74 mm | 76% | 2.9 m/s | 3 |
| 2019 | 21.5°C | 15.1°C | 8.7°C | 31.4°C | 5.1°C | 11 mm | 64% | 2.8 m/s | 3.6 |
| 2018 | 23.2°C | 16.6°C | 10.0°C | 32.0°C | 5.6°C | 20 mm | 66% | 2.5 m/s | 3.7 |
| 2017 | 20.8°C | 15.2°C | 9.5°C | 28.2°C | 5.2°C | 72 mm | 72% | 2.6 m/s | 3.3 |
| 2016 | 21.5°C | 15.5°C | 9.4°C | 28.8°C | 4.9°C | 22 mm | 66% | 2.8 m/s | 3.5 |
| 2015 | 18.3°C | 13.0°C | 7.6°C | 27.0°C | 3.6°C | 38 mm | 76% | 2.6 m/s | 3.3 |
| 2014 | 20.2°C | 14.7°C | 9.3°C | 32.8°C | 3.1°C | 68 mm | 74% | 2.8 m/s | 3.2 |
| 2013 | 21.0°C | 15.0°C | 9.0°C | 28.1°C | 3.8°C | 23 mm | 70% | 2.7 m/s | 3.5 |
| 2012 | 21.2°C | 15.0°C | 8.8°C | 29.4°C | 5.0°C | 26 mm | 69% | 2.6 m/s | 3.7 |
| 2011 | 18.9°C | 13.5°C | 8.0°C | 26.0°C | 5.6°C | 58 mm | 80% | 2.4 m/s | 3.5 |
| 2010 | 20.4°C | 15.2°C | 10.0°C | 26.7°C | 5.5°C | 64 mm | 77% | 2.6 m/s | 3 |
| 2009 | 19.7°C | 13.9°C | 8.1°C | 30.1°C | 1.0°C | 51 mm | 70% | 2.7 m/s | 3.5 |
| 2008 | 19.6°C | 13.6°C | 7.5°C | 26.6°C | 3.4°C | 28 mm | 71% | 2.6 m/s | 3.4 |
| 2007 | 22.7°C | 16.4°C | 10.2°C | 29.3°C | 7.0°C | 53 mm | 66% | 2.6 m/s | 3.7 |
| 2006 | 17.5°C | 12.4°C | 7.3°C | 23.0°C | 3.7°C | 55 mm | 72% | 3 m/s | 3.1 |
| 2005 | 23.6°C | 16.7°C | 9.9°C | 33.2°C | 4.5°C | 22 mm | 62% | 2.9 m/s | 3.9 |
| 2004 | 20.4°C | 14.3°C | 8.3°C | 27.7°C | 5.4°C | 31 mm | 72% | 2.7 m/s | 3.6 |
| 2003 | 21.1°C | 14.8°C | 8.6°C | 26.0°C | 5.3°C | 32 mm | 72% | 2.7 m/s | 3.8 |
| 2002 | 22.8°C | 16.1°C | 9.3°C | 29.4°C | 4.7°C | 25 mm | 65% | 2.2 m/s | 3.8 |
| 2001 | 19.6°C | 13.8°C | 8.1°C | 29.2°C | 4.3°C | 44 mm | 72% | 2.9 m/s | 3.4 |
| 2000 | 21.0°C | 15.0°C | 9.0°C | 27.8°C | 4.5°C | 57 mm | 72% | 2.7 m/s | 3.7 |
| 1999 | 19.3°C | 13.3°C | 7.4°C | 26.0°C | 2.3°C | 11 mm | 72% | 2.3 m/s | 3.9 |
| 1998 | 18.6°C | 13.0°C | 7.4°C | 30.5°C | 4.5°C | 79 mm | 73% | 2.5 m/s | 3.2 |
| 1997 | 20.7°C | 14.3°C | 8.0°C | 27.9°C | 2.6°C | 12 mm | 67% | 2.6 m/s | 3.5 |
| 1996 | 17.5°C | 12.8°C | 8.2°C | 22.6°C | 4.4°C | 37 mm | 77% | 3.1 m/s | 3.1 |
| 1995 🌧️ | 17.3°C | 11.8°C | 6.3°C | 24.6°C | 3.8°C | 109 mm | 76% | 3.1 m/s | 3.3 |
| 1994 | 20.4°C | 14.5°C | 8.6°C | 29.3°C | 3.9°C | 31 mm | 68% | 2.7 m/s | 3.4 |
| 1993 | 22.7°C | 15.9°C | 9.1°C | 30.2°C | 5.1°C | 4 mm | 59% | 2.5 m/s | 3.9 |
| 1992 | 19.5°C | 13.9°C | 8.4°C | 32.0°C | 2.1°C | 91 mm | 75% | 2.5 m/s | 3.6 |
| 1991 | 19.7°C | 13.7°C | 7.8°C | 28.8°C | 3.0°C | 25 mm | 71% | 2.5 m/s | 3.6 |
| 1990 | 20.7°C | 14.9°C | 9.1°C | 27.8°C | 6.2°C | 28 mm | 73% | 3.2 m/s | 3.7 |
| 1989 | 20.8°C | 15.2°C | 9.6°C | 28.5°C | 5.8°C | 39 mm | 75% | 2.5 m/s | 3.4 |
| 1988 | 21.4°C | 15.5°C | 9.5°C | 26.0°C | 4.6°C | 15 mm | 71% | 3 m/s | 3.5 |
| 1987 | 21.3°C | 15.0°C | 8.6°C | 29.6°C | 3.6°C | 28 mm | 64% | 2.7 m/s | 3.7 |
| 1986 | 19.9°C | 14.2°C | 8.5°C | 31.8°C | 6.1°C | 68 mm | 68% | 3.3 m/s | 3.5 |
| 1985 | 21.4°C | 15.5°C | 9.6°C | 34.2°C | 5.3°C | 39 mm | 68% | 2.9 m/s | 3.8 |
| 1984 | 19.6°C | 13.6°C | 7.6°C | 25.2°C | 4.3°C | 34 mm | 74% | 2.6 m/s | 3.6 |
| 1983 ❄️ | 16.8°C | 11.6°C | 6.4°C | 22.6°C | 2.6°C | 64 mm | 79% | 2.8 m/s | — |
| 1982 | 20.7°C | 14.5°C | 8.4°C | 29.4°C | 4.1°C | 31 mm | 70% | 2.5 m/s | — |
| 1981 | 22.3°C | 15.7°C | 9.2°C | 31.2°C | 3.0°C | 12 mm | 64% | 2.9 m/s | — |
Actual recorded April data for each year, 1981–2025 — sourced from NASA POWER.
The average high in April is around 20.4°C with lows near 8.7°C (mean 14.6°C), based on 45 years of NASA POWER data.
April averages 40 mm of rainfall in Hamilton, one of the drier months. The wettest on record was 109 mm in 1995.
The hottest April reached 34.2°C in 1985. The coldest dipped to 1°C in 2009.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average April temperatures have risen by about 0.8°C. Daytime highs moved from 20.2°C to 20.7°C and overnight lows from 8.2°C to 9.4°C over the same span.
April is one of the warmer months of the year in Hamilton and one of the drier months, so plan for around 20.4°C daytime highs and 8.7°C at night.
Not quite — April is the 7th coolest month in Hamilton, averaging 14.6°C.
For April in Hamilton, pack light layers you can adjust through the day, with typical highs of 20.4°C and lows of 8.7°C.
Relative humidity in April averages 71% — moderately humid.
Average wind speed in April is 2.7 m/s. The windiest April on record averaged 3.3 m/s (1986).
The wettest April on record was 1995 with 109 mm. On average, April sees 40 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 April, 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 April specifically, along with year-by-year records and how the month has changed over the decades.
