April is one of the cooler months of the year in Waipahu, with average highs near 25°C and lows around 22°C (mean 23.5°C). It is about average for rainfall, averaging 63 mm of rainfall and 75% relative humidity across the period.
April is one of the cooler months of the year in Waipahu. Across 45 years of records, the warmest April in Waipahu was 2025 — when the month averaged 25.2°C — while the coldest were 1982 and 1985 at 22°C. Typical April days reach 25°C with nights near 22°C. The long-term trend is warming, about 0.4°C per decade.
April is about average for rainfall in Waipahu, averaging 63 mm of rainfall. The wettest April on record was 1983 with 597 mm, while the driest was 2007 at 2 mm.
Relative humidity in Waipahu during April averages 75%. The most humid April was 2018 at 82%, and the least humid was 1992 at 67%.
April receives about 6.4 kWh/m²/day of solar energy in Waipahu. The sunniest Aprils were 2019 and 2021 at 7 kWh/m²/day, and the cloudiest was 2018 at 5.5.
Average wind speed in Waipahu during April is 5.7 m/s. The windiest April was 1998 at 7.6 m/s, while the calmest were 1992 and 2013 at 3.8 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 22.7°C | 23.4°C | 23.5°C | 23.9°C | 24.2°C | +1.5°C |
| Avg High | 24.1°C | 25.0°C | 24.9°C | 25.4°C | 25.7°C | +1.6°C |
| Avg Low | 21.4°C | 21.9°C | 22.0°C | 22.4°C | 22.7°C | +1.3°C |
| Avg Rain | 139 mm | 26 mm | 41 mm | 62 mm | 50 mm | -89 mm |
April temperatures in Waipahu have risen by about 1.7°C between 1981–1985 and 2021–2025.
April has ranged from a record low of 18.7°C (1985) to a record high of 28.3°C (2025).
Rainfall in April is about average for rainfall, averaging 63 mm, with a wettest year of 597 mm.
One of the best times to visit Waipahu
April is one of the best times to visit Waipahu. Expect days averaging 25°C and nights around 22°C (mean 23.5°C) — cooler than Waipahu's yearly average — with moderate rainfall (63 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 🔥 | 26.8°C | 25.2°C | 23.6°C | 28.3°C | 22.4°C | 36 mm | 74% | 4.6 m/s | 6.4 |
| 2024 | 25.7°C | 24.2°C | 22.6°C | 27.2°C | 21.3°C | 37 mm | 75% | 6 m/s | 6.4 |
| 2023 | 25.7°C | 24.3°C | 22.9°C | 27.2°C | 21.8°C | 47 mm | 77% | 5 m/s | 6.1 |
| 2022 | 25.7°C | 24.3°C | 22.8°C | 26.6°C | 21.7°C | 64 mm | 76% | 6.8 m/s | 6.5 |
| 2021 | 24.8°C | 23.3°C | 21.8°C | 26.9°C | 20.3°C | 50 mm | 75% | 5 m/s | 7 |
| 2020 | 25.4°C | 24.0°C | 22.6°C | 26.2°C | 21.5°C | 65 mm | 76% | 4.1 m/s | 6.8 |
| 2019 | 25.6°C | 24.0°C | 22.4°C | 26.5°C | 21.2°C | 62 mm | 76% | 5.4 m/s | 7 |
| 2018 | 24.7°C | 23.6°C | 22.4°C | 26.3°C | 19.4°C | 153 mm | 82% | 5.5 m/s | 5.5 |
| 2017 | 26.1°C | 24.5°C | 22.9°C | 27.2°C | 19.4°C | 122 mm | 75% | 4.7 m/s | 6.2 |
| 2016 | 26.0°C | 24.5°C | 22.9°C | 27.2°C | 20.8°C | 37 mm | 75% | 5.9 m/s | 6.7 |
| 2015 | 25.7°C | 24.2°C | 22.7°C | 26.7°C | 21.9°C | 51 mm | 76% | 6.2 m/s | 6.8 |
| 2014 | 24.9°C | 23.5°C | 22.1°C | 26.2°C | 20.6°C | 33 mm | 76% | 7 m/s | 6.5 |
| 2013 | 25.5°C | 23.8°C | 22.1°C | 26.7°C | 19.1°C | 65 mm | 76% | 3.8 m/s | 6.2 |
| 2012 | 24.8°C | 23.3°C | 21.8°C | 25.9°C | 20.7°C | 38 mm | 75% | 5.9 m/s | 6.5 |
| 2011 | 25.9°C | 24.4°C | 22.8°C | 27.2°C | 21.5°C | 39 mm | 75% | 4 m/s | 6.5 |
| 2010 | 24.9°C | 23.4°C | 21.9°C | 26.7°C | 19.7°C | 21 mm | 73% | 6.7 m/s | 6.7 |
| 2009 | 23.8°C | 22.4°C | 20.9°C | 25.7°C | 19.6°C | 72 mm | 75% | 5.2 m/s | 6.1 |
| 2008 | 25.2°C | 23.8°C | 22.3°C | 27.2°C | 20.9°C | 35 mm | 73% | 5.3 m/s | 6.4 |
| 2007 | 25.6°C | 24.1°C | 22.5°C | 26.9°C | 20.4°C | 2 mm | 69% | 6.2 m/s | 6.8 |
| 2006 | 24.0°C | 22.8°C | 21.5°C | 25.3°C | 20.7°C | 47 mm | 77% | 6.7 m/s | 6.6 |
| 2005 | 25.3°C | 23.8°C | 22.2°C | 26.5°C | 21.2°C | 29 mm | 74% | 6.2 m/s | 6.8 |
| 2004 | 25.2°C | 23.7°C | 22.2°C | 26.7°C | 20.1°C | 49 mm | 76% | 5.7 m/s | 6.7 |
| 2003 | 25.4°C | 24.0°C | 22.5°C | 26.9°C | 21.9°C | 57 mm | 74% | 5.7 m/s | 6.6 |
| 2002 | 25.6°C | 24.0°C | 22.4°C | 27.2°C | 20.0°C | 55 mm | 76% | 4 m/s | 6.6 |
| 2001 | 24.7°C | 23.4°C | 22.0°C | 25.9°C | 20.9°C | 42 mm | 74% | 7.2 m/s | 6.4 |
| 2000 | 24.1°C | 22.6°C | 21.2°C | 25.3°C | 19.6°C | 20 mm | 72% | 7.4 m/s | 6.3 |
| 1999 | 24.5°C | 22.9°C | 21.4°C | 26.1°C | 20.5°C | 34 mm | 73% | 6.4 m/s | 6.9 |
| 1998 | 24.4°C | 23.0°C | 21.6°C | 25.4°C | 20.1°C | 6 mm | 69% | 7.6 m/s | 6.5 |
| 1997 | 25.7°C | 24.1°C | 22.4°C | 27.2°C | 20.5°C | 28 mm | 72% | 5.2 m/s | 6.4 |
| 1996 | 26.1°C | 24.4°C | 22.7°C | 27.5°C | 20.8°C | 8 mm | 73% | 5.4 m/s | 6.8 |
| 1995 | 24.6°C | 23.2°C | 21.8°C | 27.0°C | 19.8°C | 19 mm | 73% | 6.2 m/s | 6.2 |
| 1994 | 24.4°C | 22.9°C | 21.5°C | 25.5°C | 20.4°C | 10 mm | 73% | 6.8 m/s | 6.3 |
| 1993 | 25.1°C | 23.6°C | 22.1°C | 26.2°C | 21.4°C | 20 mm | 72% | 6.4 m/s | 6.5 |
| 1992 | 25.6°C | 23.7°C | 21.9°C | 27.3°C | 20.5°C | 12 mm | 67% | 3.8 m/s | 6.4 |
| 1991 | 24.3°C | 22.9°C | 21.5°C | 25.9°C | 20.5°C | 23 mm | 76% | 6.1 m/s | 6.3 |
| 1990 | 24.8°C | 23.3°C | 21.8°C | 26.1°C | 20.4°C | 105 mm | 77% | 4.3 m/s | 5.9 |
| 1989 | 23.4°C | 22.2°C | 20.9°C | 25.4°C | 19.8°C | 42 mm | 76% | 6.3 m/s | 5.8 |
| 1988 | 24.6°C | 23.2°C | 21.8°C | 25.5°C | 20.8°C | 76 mm | 75% | 6.1 m/s | 6.6 |
| 1987 | 24.1°C | 22.6°C | 21.2°C | 25.8°C | 19.2°C | 48 mm | 73% | 5.6 m/s | 6.2 |
| 1986 | 24.5°C | 23.2°C | 22.0°C | 26.6°C | 20.5°C | 185 mm | 79% | 7 m/s | 5.8 |
| 1985 | 23.4°C | 22.0°C | 20.6°C | 25.0°C | 18.7°C | 150 mm | 76% | 5.3 m/s | 6.2 |
| 1984 | 24.4°C | 23.1°C | 21.9°C | 26.0°C | 20.7°C | 33 mm | 77% | 6.6 m/s | 6.6 |
| 1983 🌧️ | 23.6°C | 22.4°C | 21.1°C | 25.4°C | 19.4°C | 597 mm | 77% | 5.5 m/s | — |
| 1982 ❄️ | 23.2°C | 22.0°C | 20.8°C | 25.5°C | 18.8°C | 95 mm | 80% | 5.8 m/s | — |
| 1981 | 25.4°C | 23.7°C | 22.1°C | 26.7°C | 21.3°C | 23 mm | 74% | 5 m/s | — |
Actual recorded April data for each year, 1981–2025 — sourced from NASA POWER.
The average high in April is around 25°C with lows near 22°C (mean 23.5°C), based on 45 years of NASA POWER data.
April averages 63 mm of rainfall in Waipahu, about average for rainfall. The wettest on record was 597 mm in 1983.
The hottest April reached 28.3°C in 2025. The coldest dipped to 18.7°C in 1985.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average April temperatures have risen by about 1.7°C. Daytime highs moved from 24°C to 25.7°C and overnight lows from 21.3°C to 22.7°C over the same span.
April is one of the cooler months of the year in Waipahu and about average for rainfall, so plan for around 25°C daytime highs and 22°C at night.
Not quite — April is the 4th coolest month in Waipahu, averaging 23.5°C.
For April in Waipahu, pack light layers you can adjust through the day, with typical highs of 25°C and lows of 22°C. Bring an umbrella or light rain jacket too.
Relative humidity in April averages 75% — moderately humid.
Average wind speed in April is 5.7 m/s. The windiest April on record averaged 7.6 m/s (1998).
The wettest April on record was 1983 with 597 mm. On average, April sees 63 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 Waipahu 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.
