April is one of the warmer months of the year in Whanganui, with average highs near 17.9°C and lows around 12.1°C (mean 15°C). It is about average for rainfall, averaging 82 mm of rainfall and 81% relative humidity across the period.
April is one of the warmer months of the year in Whanganui. Across 45 years of records, the warmest April in Whanganui was 2025 — when the month averaged 16.9°C — while the coldest was 1992 at 12°C. Typical April days reach 17.9°C with nights near 12.1°C. The long-term trend is warming, about 0.2°C per decade.
April is about average for rainfall in Whanganui, averaging 82 mm of rainfall. The wettest April on record was 2017 with 244 mm, while the driest was 1982 at 22 mm.
Relative humidity in Whanganui during April averages 81%. The most humid April was 2017 at 86%, and the least humid was 2001 at 76%.
April receives about 3.2 kWh/m²/day of solar energy in Whanganui. The sunniest April was 2022 at 3.6 kWh/m²/day, and the cloudiest was 1996 at 2.6.
Average wind speed in Whanganui during April is 4.3 m/s. The windiest Aprils were 1981 and 2018 at 5.2 m/s, while the calmest was 2002 at 3.6 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 14.9°C | 14.6°C | 14.9°C | 15.3°C | 15.5°C | +0.6°C |
| Avg High | 18.0°C | 17.3°C | 17.9°C | 18.1°C | 18.5°C | +0.5°C |
| Avg Low | 11.7°C | 11.8°C | 11.9°C | 12.5°C | 12.6°C | +0.9°C |
| Avg Rain | 58 mm | 99 mm | 62 mm | 119 mm | 62 mm | +4 mm |
April temperatures in Whanganui have risen by about 0.6°C between 1981–1985 and 2021–2025.
April has ranged from a record low of 5.6°C (1992) to a record high of 25°C (1999).
Rainfall in April is about average for rainfall, averaging 82 mm, with a wettest year of 244 mm.
A good time to visit Whanganui
April is a good time to visit Whanganui, with days averaging 17.9°C and nights around 12.1°C (mean 15°C, warmer than Whanganui'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 🔥 | 19.9°C | 16.9°C | 14.0°C | 23.6°C | 8.6°C | 98 mm | 80% | 4.3 m/s | 3.1 |
| 2024 | 18.1°C | 15.1°C | 12.0°C | 22.2°C | 8.8°C | 65 mm | 80% | 4.1 m/s | 3.1 |
| 2023 | 18.5°C | 15.5°C | 12.6°C | 21.7°C | 8.9°C | 85 mm | 85% | 4.2 m/s | 3.2 |
| 2022 | 18.4°C | 15.4°C | 12.3°C | 22.5°C | 9.0°C | 28 mm | 83% | 3.8 m/s | 3.6 |
| 2021 | 17.8°C | 15.1°C | 12.5°C | 21.9°C | 7.6°C | 62 mm | 82% | 4.4 m/s | 3.2 |
| 2020 | 18.0°C | 14.9°C | 11.9°C | 20.5°C | 9.6°C | 32 mm | 79% | 4.5 m/s | 3.4 |
| 2019 | 17.4°C | 14.6°C | 11.8°C | 22.4°C | 8.1°C | 171 mm | 82% | 4.3 m/s | 3.2 |
| 2018 | 17.7°C | 15.2°C | 12.6°C | 21.1°C | 7.9°C | 131 mm | 81% | 5.2 m/s | 3 |
| 2017 🌧️ | 17.7°C | 15.0°C | 12.4°C | 21.4°C | 7.8°C | 244 mm | 86% | 3.7 m/s | 3.1 |
| 2016 | 19.2°C | 16.1°C | 12.9°C | 22.7°C | 8.9°C | 41 mm | 78% | 4 m/s | 3.3 |
| 2015 | 18.2°C | 15.5°C | 12.8°C | 22.4°C | 8.5°C | 178 mm | 82% | 4.7 m/s | 3 |
| 2014 | 18.6°C | 16.0°C | 13.5°C | 22.0°C | 10.2°C | 154 mm | 83% | 4.3 m/s | 2.9 |
| 2013 | 18.7°C | 16.0°C | 13.3°C | 22.7°C | 7.8°C | 81 mm | 80% | 4.7 m/s | 3 |
| 2012 | 18.1°C | 14.8°C | 11.5°C | 21.4°C | 8.0°C | 39 mm | 81% | 4.2 m/s | 3.5 |
| 2011 | 17.2°C | 14.3°C | 11.5°C | 20.4°C | 8.2°C | 127 mm | 81% | 4.7 m/s | 2.9 |
| 2010 | 18.1°C | 15.1°C | 12.2°C | 20.3°C | 9.0°C | 26 mm | 79% | 4.8 m/s | 3.4 |
| 2009 | 18.0°C | 14.6°C | 11.2°C | 21.4°C | 7.5°C | 43 mm | 77% | 4.1 m/s | 3.4 |
| 2008 | 18.7°C | 15.8°C | 12.9°C | 21.6°C | 7.8°C | 131 mm | 78% | 4.1 m/s | 3.2 |
| 2007 | 17.2°C | 14.3°C | 11.4°C | 20.3°C | 8.2°C | 44 mm | 81% | 3.7 m/s | 3.2 |
| 2006 | 18.8°C | 16.0°C | 13.3°C | 21.6°C | 9.6°C | 86 mm | 82% | 4.8 m/s | 3 |
| 2005 | 17.1°C | 14.0°C | 11.0°C | 21.0°C | 7.0°C | 36 mm | 81% | 4.1 m/s | 3.1 |
| 2004 | 16.1°C | 13.4°C | 10.8°C | 19.1°C | 7.1°C | 46 mm | 85% | 3.8 m/s | 3.1 |
| 2003 | 18.2°C | 15.0°C | 11.8°C | 22.2°C | 8.8°C | 35 mm | 78% | 3.7 m/s | 3.1 |
| 2002 | 18.0°C | 15.0°C | 12.0°C | 22.5°C | 8.9°C | 37 mm | 79% | 3.6 m/s | 3 |
| 2001 | 18.4°C | 15.1°C | 11.7°C | 20.6°C | 7.2°C | 73 mm | 76% | 3.9 m/s | 3.2 |
| 2000 | 18.5°C | 15.6°C | 12.8°C | 22.3°C | 10.3°C | 93 mm | 81% | 4.5 m/s | 2.9 |
| 1999 | 18.9°C | 15.7°C | 12.5°C | 25.0°C | 9.0°C | 41 mm | 78% | 4.6 m/s | 3.2 |
| 1998 | 19.1°C | 15.8°C | 12.4°C | 22.6°C | 9.6°C | 54 mm | 79% | 4.2 m/s | 3 |
| 1997 | 16.4°C | 13.7°C | 10.9°C | 21.3°C | 7.6°C | 112 mm | 82% | 4.7 m/s | 3.1 |
| 1996 | 17.7°C | 15.4°C | 13.0°C | 21.3°C | 8.9°C | 159 mm | 86% | 4.3 m/s | 2.6 |
| 1995 | 18.7°C | 16.3°C | 13.9°C | 22.5°C | 7.8°C | 149 mm | 85% | 3.9 m/s | 3 |
| 1994 | 17.9°C | 14.8°C | 11.7°C | 21.9°C | 6.9°C | 61 mm | 81% | 4 m/s | 3.2 |
| 1993 | 15.8°C | 13.3°C | 10.8°C | 20.5°C | 7.8°C | 71 mm | 82% | 4.1 m/s | 3 |
| 1992 ❄️ | 14.7°C | 12.0°C | 9.2°C | 17.1°C | 5.6°C | 65 mm | 83% | 3.7 m/s | 3.2 |
| 1991 | 15.8°C | 13.6°C | 11.3°C | 22.5°C | 7.6°C | 201 mm | 82% | 5.1 m/s | 2.9 |
| 1990 | 17.8°C | 15.1°C | 12.3°C | 20.1°C | 7.0°C | 82 mm | 83% | 4.9 m/s | 3.1 |
| 1989 | 18.7°C | 15.5°C | 12.4°C | 21.5°C | 8.8°C | 49 mm | 78% | 4.3 m/s | 3.5 |
| 1988 | 17.3°C | 13.9°C | 10.5°C | 20.5°C | 7.5°C | 41 mm | 79% | 3.8 m/s | 3.4 |
| 1987 | 16.8°C | 14.0°C | 11.1°C | 20.7°C | 7.6°C | 98 mm | 83% | 4.8 m/s | 3.3 |
| 1986 | 18.6°C | 15.6°C | 12.6°C | 21.9°C | 10.1°C | 46 mm | 81% | 4.6 m/s | 3.5 |
| 1985 | 18.5°C | 14.9°C | 11.3°C | 22.7°C | 7.7°C | 49 mm | 76% | 3.8 m/s | 3.3 |
| 1984 | 18.3°C | 15.2°C | 12.1°C | 21.7°C | 8.4°C | 71 mm | 80% | 4.5 m/s | 3.2 |
| 1983 | 17.7°C | 14.7°C | 11.6°C | 20.9°C | 6.3°C | 90 mm | 80% | 4.9 m/s | — |
| 1982 | 17.0°C | 13.8°C | 10.6°C | 20.0°C | 7.6°C | 22 mm | 78% | 4.2 m/s | — |
| 1981 | 19.3°C | 16.4°C | 13.5°C | 22.9°C | 9.7°C | 53 mm | 81% | 5.2 m/s | — |
Actual recorded April data for each year, 1981–2025 — sourced from NASA POWER.
The average high in April is around 17.9°C with lows near 12.1°C (mean 15°C), based on 45 years of NASA POWER data.
April averages 82 mm of rainfall in Whanganui, about average for rainfall. The wettest on record was 244 mm in 2017.
The hottest April reached 25°C in 1999. The coldest dipped to 5.6°C in 1992.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average April temperatures have risen by about 0.6°C. Daytime highs moved from 18.2°C to 18.5°C and overnight lows from 11.8°C to 12.7°C over the same span.
April is one of the warmer months of the year in Whanganui and about average for rainfall, so plan for around 17.9°C daytime highs and 12.1°C at night.
Not quite — April is the 8th coolest month in Whanganui, averaging 15°C.
For April in Whanganui, pack light layers you can adjust through the day, with typical highs of 17.9°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 4.3 m/s. The windiest April on record averaged 5.2 m/s (1981).
The wettest April on record was 2017 with 244 mm. On average, April sees 82 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 Whanganui 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.
