April is one of the warmer months of the year in Blenheim, with average highs near 16.2°C and lows around 7.6°C (mean 11.9°C). It is about average for rainfall, averaging 70 mm of rainfall and 82% relative humidity across the period.
April is one of the warmer months of the year in Blenheim. Across 45 years of records, the warmest April in Blenheim was 1981 — when the month averaged 13.3°C — while the coldest was 1993 at 9.6°C. Typical April days reach 16.2°C with nights near 7.6°C. The long-term April temperature trend is broadly flat.
April is about average for rainfall in Blenheim, averaging 70 mm of rainfall. The wettest April on record was 2017 with 191 mm, while the driest was 1988 at 17 mm.
Relative humidity in Blenheim during April averages 82%. The most humid April was 1995 at 89%, and the least humid was 1989 at 75%.
April receives about 3.2 kWh/m²/day of solar energy in Blenheim. The sunniest Aprils were 1986, 2012 and 2016 at 3.6 kWh/m²/day, and the cloudiest was 2014 at 2.6.
Average wind speed in Blenheim during April is 2.1 m/s. The windiest Aprils were 1983 and 2006 at 2.4 m/s, while the calmest was 2007 at 1.6 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 11.9°C | 11.5°C | 12.0°C | 12.0°C | 12.4°C | +0.5°C |
| Avg High | 16.5°C | 15.7°C | 16.3°C | 16.1°C | 16.5°C | 0°C |
| Avg Low | 7.2°C | 7.2°C | 7.7°C | 7.9°C | 8.3°C | +1.1°C |
| Avg Rain | 59 mm | 72 mm | 56 mm | 92 mm | 70 mm | +11 mm |
April temperatures in Blenheim have risen by about 0.6°C between 1981–1985 and 2021–2025.
April has ranged from a record low of 0.3°C (1995) to a record high of 23.8°C (1990).
Rainfall in April is about average for rainfall, averaging 70 mm, with a wettest year of 191 mm.
Daytime highs and overnight lows have shifted differently — highs rose about 0°C per decade while lows rose 0.3°C per decade, narrowing the gap between day and night.
A good time to visit Blenheim
April is a good time to visit Blenheim, with days averaging 16.2°C and nights around 7.6°C (mean 11.9°C, close to Blenheim'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 | 16.2°C | 12.9°C | 9.6°C | 21.0°C | 5.0°C | 151 mm | 87% | 2.1 m/s | 2.8 |
| 2024 | 16.6°C | 12.1°C | 7.7°C | 18.7°C | 2.1°C | 67 mm | 82% | 2 m/s | 3.1 |
| 2023 | 15.8°C | 12.4°C | 9.0°C | 18.7°C | 2.9°C | 103 mm | 87% | 2 m/s | 3 |
| 2022 | 17.0°C | 12.8°C | 8.6°C | 21.4°C | 4.3°C | 29 mm | 84% | 1.9 m/s | 3.5 |
| 2021 | 16.5°C | 12.1°C | 7.7°C | 21.0°C | 4.5°C | 48 mm | 84% | 2.1 m/s | 3.2 |
| 2020 | 16.7°C | 12.0°C | 7.4°C | 19.5°C | 2.4°C | 24 mm | 80% | 2.1 m/s | 3.4 |
| 2019 | 15.4°C | 11.2°C | 7.0°C | 19.9°C | 3.3°C | 113 mm | 84% | 2.3 m/s | 3.3 |
| 2018 | 15.1°C | 11.0°C | 6.9°C | 19.4°C | 1.3°C | 95 mm | 85% | 2.3 m/s | 3 |
| 2017 🌧️ | 15.5°C | 12.0°C | 8.6°C | 21.8°C | 4.9°C | 191 mm | 89% | 2.1 m/s | 2.8 |
| 2016 | 16.6°C | 12.3°C | 8.0°C | 20.2°C | 5.1°C | 42 mm | 83% | 1.8 m/s | 3.6 |
| 2015 | 16.2°C | 12.3°C | 8.3°C | 21.8°C | 1.4°C | 101 mm | 83% | 2.3 m/s | 2.9 |
| 2014 | 15.9°C | 12.4°C | 8.9°C | 21.0°C | 3.2°C | 145 mm | 87% | 2.3 m/s | 2.6 |
| 2013 | 16.2°C | 12.3°C | 8.5°C | 21.9°C | 3.5°C | 86 mm | 84% | 2.1 m/s | 2.7 |
| 2012 | 16.5°C | 12.0°C | 7.5°C | 19.5°C | 4.1°C | 41 mm | 82% | 2.1 m/s | 3.6 |
| 2011 | 15.2°C | 11.1°C | 7.0°C | 21.2°C | 2.0°C | 83 mm | 81% | 2.2 m/s | 3 |
| 2010 | 17.9°C | 13.0°C | 8.0°C | 22.0°C | 4.0°C | 21 mm | 78% | 2.3 m/s | 3.3 |
| 2009 | 16.1°C | 11.8°C | 7.5°C | 21.4°C | 3.4°C | 41 mm | 80% | 2.3 m/s | 3.2 |
| 2008 | 16.3°C | 12.2°C | 8.2°C | 21.5°C | 1.8°C | 105 mm | 83% | 1.9 m/s | 3.1 |
| 2007 | 16.6°C | 11.9°C | 7.1°C | 21.5°C | 2.7°C | 52 mm | 79% | 1.6 m/s | 3.2 |
| 2006 | 16.9°C | 13.2°C | 9.6°C | 20.1°C | 6.0°C | 95 mm | 84% | 2.4 m/s | 2.8 |
| 2005 | 15.9°C | 11.3°C | 6.7°C | 21.1°C | 0.6°C | 23 mm | 81% | 1.9 m/s | 3.5 |
| 2004 | 15.1°C | 10.9°C | 6.7°C | 20.0°C | 1.6°C | 81 mm | 85% | 1.8 m/s | 3 |
| 2003 | 15.9°C | 11.6°C | 7.3°C | 19.3°C | 3.2°C | 55 mm | 81% | 2 m/s | 3.2 |
| 2002 | 16.6°C | 12.2°C | 7.9°C | 21.5°C | 2.4°C | 34 mm | 80% | 1.8 m/s | 3.1 |
| 2001 | 17.6°C | 12.6°C | 7.7°C | 21.1°C | 4.1°C | 22 mm | 77% | 2 m/s | 3.3 |
| 2000 | 16.4°C | 12.3°C | 8.1°C | 20.3°C | 3.5°C | 53 mm | 84% | 2.3 m/s | 2.9 |
| 1999 | 16.2°C | 12.0°C | 7.8°C | 21.2°C | 1.4°C | 46 mm | 81% | 2.2 m/s | 3.1 |
| 1998 | 17.0°C | 12.4°C | 7.7°C | 20.4°C | 2.9°C | 23 mm | 79% | 2.1 m/s | 3.1 |
| 1997 | 15.4°C | 10.7°C | 5.9°C | 19.1°C | 1.2°C | 50 mm | 80% | 2.1 m/s | 3.1 |
| 1996 | 15.6°C | 12.0°C | 8.4°C | 19.3°C | 4.8°C | 89 mm | 87% | 2.2 m/s | 2.8 |
| 1995 | 15.2°C | 12.1°C | 9.0°C | 18.2°C | 0.3°C | 172 mm | 89% | 2.2 m/s | 2.7 |
| 1994 | 17.1°C | 12.2°C | 7.2°C | 21.4°C | 0.9°C | 31 mm | 79% | 2 m/s | 3.5 |
| 1993 ❄️ | 13.6°C | 9.6°C | 5.7°C | 17.9°C | 2.0°C | 80 mm | 86% | 1.9 m/s | 3.2 |
| 1992 | 14.4°C | 10.1°C | 5.8°C | 18.1°C | 1.4°C | 31 mm | 80% | 1.9 m/s | 3.4 |
| 1991 | 15.0°C | 10.6°C | 6.2°C | 20.4°C | 1.4°C | 85 mm | 82% | 2.3 m/s | 3.1 |
| 1990 | 17.6°C | 12.9°C | 8.1°C | 23.8°C | 1.0°C | 112 mm | 79% | 2.2 m/s | 3.1 |
| 1989 | 18.0°C | 12.6°C | 7.1°C | 21.1°C | 2.9°C | 25 mm | 75% | 1.9 m/s | 3.5 |
| 1988 | 16.4°C | 11.2°C | 6.1°C | 22.4°C | 2.9°C | 17 mm | 78% | 1.9 m/s | 3.5 |
| 1987 | 15.4°C | 11.0°C | 6.5°C | 19.6°C | 2.9°C | 106 mm | 83% | 2.1 m/s | 3.3 |
| 1986 | 17.7°C | 12.6°C | 7.5°C | 20.4°C | 3.9°C | 30 mm | 81% | 2 m/s | 3.6 |
| 1985 | 16.3°C | 11.8°C | 7.3°C | 21.6°C | 2.8°C | 78 mm | 80% | 1.9 m/s | 3.4 |
| 1984 | 16.7°C | 11.9°C | 7.2°C | 20.8°C | 2.6°C | 42 mm | 81% | 1.9 m/s | 3.3 |
| 1983 | 15.2°C | 11.2°C | 7.1°C | 20.0°C | 3.2°C | 150 mm | 84% | 2.4 m/s | — |
| 1982 | 15.2°C | 11.1°C | 6.9°C | 20.2°C | 4.0°C | 46 mm | 79% | 2.2 m/s | — |
| 1981 🔥 | 17.9°C | 13.3°C | 8.7°C | 23.2°C | 4.1°C | 39 mm | 80% | 2.3 m/s | — |
Actual recorded April data for each year, 1981–2025 — sourced from NASA POWER.
The average high in April is around 16.2°C with lows near 7.6°C (mean 11.9°C), based on 45 years of NASA POWER data.
April averages 70 mm of rainfall in Blenheim, about average for rainfall. The wettest on record was 191 mm in 2017.
The hottest April reached 23.8°C in 1990. The coldest dipped to 0.3°C in 1995.
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 16.3°C to 16.4°C and overnight lows from 7.4°C to 8.5°C over the same span.
April is one of the warmer months of the year in Blenheim and about average for rainfall, so plan for around 16.2°C daytime highs and 7.6°C at night.
Not quite — April is the 7th coolest month in Blenheim, averaging 11.9°C.
For April in Blenheim, pack warm layers and a jacket for chilly mornings, with typical highs of 16.2°C and lows of 7.6°C. Bring an umbrella or light rain jacket too.
Relative humidity in April averages 82% — quite humid.
Average wind speed in April is 2.1 m/s. The windiest April on record averaged 2.4 m/s (1983).
The wettest April on record was 2017 with 191 mm. On average, April sees 70 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 Blenheim 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.
