April is one of the warmer months of the year in Hamilton, with average highs near 19°C and lows around 12.1°C (mean 15.6°C). It is about average for rainfall, averaging 100 mm of rainfall and 81% 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 17.4°C — while the coldest was 1992 at 12.7°C. Typical April days reach 19°C with nights near 12.1°C. The long-term trend is warming, about 0.3°C per decade.
April is about average for rainfall in Hamilton, averaging 100 mm of rainfall. The wettest April on record was 1995 with 258 mm, while the driest was 2005 at 30 mm.
Relative humidity in Hamilton during April averages 81%. The most humid April was 1996 at 86%, and the least humid was 1982 at 76%.
April receives about 3.3 kWh/m²/day of solar energy in Hamilton. The sunniest Aprils were 2005, 2019 and 2022 at 3.7 kWh/m²/day, and the cloudiest was 1996 at 2.8.
Average wind speed in Hamilton during April is 3.6 m/s. The windiest April was 1991 at 4.4 m/s, while the calmest were 2003, 2007 and 2016 at 3 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 15.2°C | 15.1°C | 15.5°C | 16.0°C | 16.2°C | +1°C |
| Avg High | 18.8°C | 18.4°C | 18.9°C | 19.4°C | 19.6°C | +0.8°C |
| Avg Low | 11.5°C | 11.8°C | 12.0°C | 12.6°C | 12.8°C | +1.3°C |
| Avg Rain | 93 mm | 121 mm | 84 mm | 119 mm | 74 mm | -19 mm |
April temperatures in Hamilton have risen by about 1.3°C between 1981–1985 and 2021–2025.
April has ranged from a record low of 4.4°C (1994) to a record high of 25°C (1999).
Rainfall in April is about average for rainfall, averaging 100 mm, with a wettest year of 258 mm.
A good time to visit Hamilton
April is a good time to visit Hamilton, with days averaging 19°C and nights around 12.1°C (mean 15.6°C, warmer than Hamilton's yearly average) and higher 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 🔥 | 20.7°C | 17.4°C | 14.1°C | 23.5°C | 8.5°C | 132 mm | 83% | 4.3 m/s | 2.9 |
| 2024 | 18.9°C | 15.7°C | 12.4°C | 22.2°C | 8.2°C | 86 mm | 83% | 3.5 m/s | 3.2 |
| 2023 | 19.6°C | 16.4°C | 13.2°C | 22.8°C | 8.6°C | 81 mm | 84% | 4.1 m/s | 3 |
| 2022 | 20.2°C | 16.4°C | 12.7°C | 23.1°C | 8.5°C | 44 mm | 80% | 3.4 m/s | 3.7 |
| 2021 | 19.3°C | 16.0°C | 12.6°C | 23.4°C | 8.4°C | 47 mm | 82% | 3.5 m/s | 3.3 |
| 2020 | 19.1°C | 15.4°C | 11.6°C | 23.0°C | 8.9°C | 50 mm | 79% | 3.5 m/s | 3.6 |
| 2019 | 19.0°C | 15.1°C | 11.2°C | 22.0°C | 7.5°C | 138 mm | 80% | 3.4 m/s | 3.7 |
| 2018 | 19.0°C | 16.0°C | 13.1°C | 22.1°C | 7.1°C | 103 mm | 82% | 4.3 m/s | 3 |
| 2017 | 19.8°C | 16.4°C | 13.0°C | 24.0°C | 7.8°C | 218 mm | 84% | 3.2 m/s | 3.3 |
| 2016 | 19.8°C | 16.4°C | 12.9°C | 23.4°C | 9.1°C | 62 mm | 80% | 3 m/s | 3.3 |
| 2015 | 19.3°C | 16.0°C | 12.6°C | 22.8°C | 7.1°C | 133 mm | 82% | 3.9 m/s | 3.1 |
| 2014 | 20.0°C | 16.8°C | 13.5°C | 24.2°C | 8.6°C | 158 mm | 82% | 3.5 m/s | 3.3 |
| 2013 | 19.7°C | 16.7°C | 13.8°C | 23.3°C | 8.3°C | 145 mm | 81% | 3.7 m/s | 3.2 |
| 2012 | 19.6°C | 15.5°C | 11.5°C | 23.1°C | 7.6°C | 44 mm | 79% | 3.3 m/s | 3.6 |
| 2011 | 18.6°C | 15.3°C | 11.9°C | 21.4°C | 7.0°C | 145 mm | 82% | 3.7 m/s | 3.2 |
| 2010 | 19.5°C | 15.8°C | 12.1°C | 22.4°C | 8.1°C | 39 mm | 79% | 3.2 m/s | 3.5 |
| 2009 | 18.8°C | 15.0°C | 11.1°C | 21.6°C | 6.1°C | 46 mm | 80% | 3.6 m/s | 3.2 |
| 2008 | 19.6°C | 16.2°C | 12.8°C | 22.0°C | 5.2°C | 144 mm | 80% | 3.8 m/s | 3.1 |
| 2007 | 18.4°C | 15.1°C | 11.8°C | 21.8°C | 7.3°C | 64 mm | 80% | 3 m/s | 3.4 |
| 2006 | 19.5°C | 16.6°C | 13.7°C | 22.4°C | 10.6°C | 152 mm | 83% | 4 m/s | 3.1 |
| 2005 | 19.1°C | 15.1°C | 11.1°C | 22.3°C | 5.4°C | 30 mm | 79% | 3.7 m/s | 3.7 |
| 2004 | 17.4°C | 14.1°C | 10.8°C | 22.3°C | 6.3°C | 81 mm | 83% | 3.3 m/s | 3.2 |
| 2003 | 19.3°C | 15.7°C | 12.1°C | 22.4°C | 6.7°C | 62 mm | 79% | 3 m/s | 3.3 |
| 2002 | 18.8°C | 15.3°C | 11.7°C | 21.3°C | 6.9°C | 49 mm | 79% | 3.2 m/s | 3.3 |
| 2001 | 19.3°C | 15.7°C | 12.0°C | 22.1°C | 7.8°C | 96 mm | 79% | 3.7 m/s | 3.1 |
| 2000 | 19.1°C | 16.1°C | 13.0°C | 23.3°C | 8.0°C | 120 mm | 83% | 3.5 m/s | 3 |
| 1999 | 19.6°C | 16.0°C | 12.4°C | 25.0°C | 8.5°C | 60 mm | 79% | 3.8 m/s | 3.1 |
| 1998 | 19.9°C | 16.4°C | 12.8°C | 23.8°C | 9.1°C | 40 mm | 81% | 3.6 m/s | 3 |
| 1997 | 17.6°C | 14.3°C | 11.0°C | 22.5°C | 7.3°C | 75 mm | 81% | 4 m/s | 3.3 |
| 1996 | 18.8°C | 15.9°C | 13.1°C | 21.9°C | 7.6°C | 178 mm | 86% | 3.8 m/s | 2.8 |
| 1995 🌧️ | 20.1°C | 17.1°C | 14.2°C | 23.9°C | 7.1°C | 258 mm | 85% | 3.5 m/s | 3.3 |
| 1994 | 18.8°C | 15.0°C | 11.2°C | 22.6°C | 4.4°C | 55 mm | 82% | 3.6 m/s | 3.3 |
| 1993 | 16.9°C | 13.7°C | 10.4°C | 21.0°C | 6.0°C | 98 mm | 83% | 3.8 m/s | 3.2 |
| 1992 ❄️ | 16.5°C | 12.7°C | 8.9°C | 21.9°C | 5.0°C | 86 mm | 82% | 3.3 m/s | 3.5 |
| 1991 | 16.8°C | 13.8°C | 10.8°C | 23.0°C | 6.8°C | 249 mm | 83% | 4.4 m/s | 3.3 |
| 1990 | 19.1°C | 16.0°C | 12.8°C | 21.9°C | 5.9°C | 109 mm | 83% | 4 m/s | 3.3 |
| 1989 | 19.2°C | 15.6°C | 12.0°C | 22.8°C | 7.2°C | 60 mm | 79% | 3.7 m/s | 3.4 |
| 1988 | 18.8°C | 14.8°C | 10.7°C | 23.2°C | 6.2°C | 37 mm | 81% | 3.4 m/s | 3.4 |
| 1987 | 18.4°C | 14.9°C | 11.4°C | 22.9°C | 7.7°C | 127 mm | 82% | 4.3 m/s | 3.3 |
| 1986 | 19.2°C | 15.7°C | 12.3°C | 21.8°C | 7.8°C | 73 mm | 82% | 3.9 m/s | 3.6 |
| 1985 | 18.6°C | 14.8°C | 11.0°C | 22.6°C | 6.7°C | 85 mm | 80% | 3.8 m/s | 3.3 |
| 1984 | 18.7°C | 14.9°C | 11.2°C | 21.6°C | 7.4°C | 69 mm | 81% | 3.3 m/s | 3.5 |
| 1983 | 18.5°C | 15.0°C | 11.5°C | 21.6°C | 5.6°C | 192 mm | 83% | 3.7 m/s | — |
| 1982 | 18.2°C | 14.2°C | 10.2°C | 20.7°C | 7.2°C | 50 mm | 76% | 3.2 m/s | — |
| 1981 | 19.9°C | 16.7°C | 13.4°C | 23.7°C | 11.0°C | 141 mm | 82% | 3.8 m/s | — |
Actual recorded April data for each year, 1981–2025 — sourced from NASA POWER.
The average high in April is around 19°C with lows near 12.1°C (mean 15.6°C), based on 45 years of NASA POWER data.
April averages 100 mm of rainfall in Hamilton, about average for rainfall. The wettest on record was 258 mm in 1995.
The hottest April reached 25°C in 1999. The coldest dipped to 4.4°C in 1994.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average April temperatures have risen by about 1.3°C. Daytime highs moved from 18.8°C to 19.7°C and overnight lows from 11.5°C to 13°C over the same span.
April is one of the warmer months of the year in Hamilton and about average for rainfall, so plan for around 19°C daytime highs and 12.1°C at night.
Not quite — April is the 8th coolest month in Hamilton, averaging 15.6°C.
For April in Hamilton, pack light layers you can adjust through the day, with typical highs of 19°C and lows of 12.1°C. Bring an umbrella or light rain jacket too.
Relative humidity in April averages 81% — quite humid.
Average wind speed in April is 3.6 m/s. The windiest April on record averaged 4.4 m/s (1991).
The wettest April on record was 1995 with 258 mm. On average, April sees 100 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.
