April is one of the cooler months of the year in Kailua, with average highs near 24.1°C and lows around 22.6°C (mean 23.4°C). It is about average for rainfall, averaging 45 mm of rainfall and 77% relative humidity across the period.
April is one of the cooler months of the year in Kailua. Across 45 years of records, the warmest April in Kailua was 2025 — when the month averaged 25.1°C — while the coldest was 1985 at 22°C. Typical April days reach 24.1°C with nights near 22.6°C. The long-term trend is warming, about 0.4°C per decade.
April is about average for rainfall in Kailua, averaging 45 mm of rainfall. The wettest April on record was 1983 with 324 mm, while the driest was 2007 at 3 mm.
Relative humidity in Kailua during April averages 77%. The most humid April was 2018 at 82%, and the least humid was 1992 at 71%.
April receives about 6.2 kWh/m²/day of solar energy in Kailua. The sunniest Aprils were 1999 and 2019 at 6.8 kWh/m²/day, and the cloudiest was 2018 at 5.2.
Average wind speed in Kailua during April is 6.1 m/s. The windiest April was 1998 at 7.8 m/s, while the calmest was 1992 at 4.1 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 22.7°C | 23.1°C | 23.3°C | 23.8°C | 24.2°C | +1.5°C |
| Avg High | 23.4°C | 23.9°C | 24.0°C | 24.6°C | 25.0°C | +1.6°C |
| Avg Low | 22.0°C | 22.4°C | 22.6°C | 23.0°C | 23.3°C | +1.3°C |
| Avg Rain | 84 mm | 20 mm | 34 mm | 48 mm | 38 mm | -45 mm |
April temperatures in Kailua have risen by about 1.6°C between 1981–1985 and 2021–2025.
April has ranged from a record low of 19.6°C (2017) to a record high of 27°C (2025).
Rainfall in April is about average for rainfall, averaging 45 mm, with a wettest year of 324 mm.
One of the best times to visit Kailua
April is one of the best times to visit Kailua. Expect days averaging 24.1°C and nights around 22.6°C (mean 23.4°C) — cooler than Kailua's yearly average — with moderate rainfall (45 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 🔥 | 26.0°C | 25.1°C | 24.1°C | 27.0°C | 22.8°C | 28 mm | 76% | 4.6 m/s | 6.2 |
| 2024 | 24.7°C | 23.9°C | 23.1°C | 25.8°C | 22.0°C | 33 mm | 78% | 6.4 m/s | 6.2 |
| 2023 | 25.1°C | 24.3°C | 23.5°C | 26.2°C | 22.5°C | 43 mm | 79% | 5.4 m/s | 5.9 |
| 2022 | 24.8°C | 24.1°C | 23.4°C | 25.6°C | 22.6°C | 47 mm | 78% | 7.2 m/s | 6.2 |
| 2021 | 24.2°C | 23.4°C | 22.5°C | 25.9°C | 20.9°C | 34 mm | 75% | 5.3 m/s | 6.7 |
| 2020 | 25.2°C | 24.3°C | 23.4°C | 25.8°C | 22.2°C | 44 mm | 76% | 4.3 m/s | 6.5 |
| 2019 | 24.7°C | 23.9°C | 23.0°C | 25.8°C | 22.0°C | 40 mm | 78% | 5.7 m/s | 6.8 |
| 2018 | 24.3°C | 23.7°C | 23.0°C | 26.0°C | 20.7°C | 115 mm | 82% | 5.8 m/s | 5.2 |
| 2017 | 25.4°C | 24.4°C | 23.5°C | 26.4°C | 19.6°C | 92 mm | 77% | 5.2 m/s | 6 |
| 2016 | 25.1°C | 24.3°C | 23.5°C | 26.3°C | 22.0°C | 28 mm | 77% | 6.4 m/s | 6.4 |
| 2015 | 24.8°C | 24.1°C | 23.3°C | 26.1°C | 22.5°C | 40 mm | 78% | 6.8 m/s | 6.6 |
| 2014 | 24.2°C | 23.5°C | 22.8°C | 25.5°C | 21.3°C | 32 mm | 78% | 7.2 m/s | 6.1 |
| 2013 | 24.8°C | 23.8°C | 22.9°C | 26.0°C | 20.3°C | 38 mm | 77% | 4.2 m/s | 6.3 |
| 2012 | 24.0°C | 23.2°C | 22.4°C | 25.0°C | 21.6°C | 36 mm | 77% | 6.5 m/s | 6.4 |
| 2011 | 25.2°C | 24.3°C | 23.4°C | 26.0°C | 22.1°C | 44 mm | 76% | 4.5 m/s | 6.4 |
| 2010 | 23.7°C | 23.1°C | 22.4°C | 25.4°C | 20.4°C | 18 mm | 76% | 7 m/s | 6.4 |
| 2009 | 23.1°C | 22.3°C | 21.5°C | 24.9°C | 20.5°C | 72 mm | 77% | 5.5 m/s | 5.8 |
| 2008 | 24.4°C | 23.7°C | 22.9°C | 26.0°C | 21.5°C | 35 mm | 76% | 5.6 m/s | 6.1 |
| 2007 | 24.4°C | 23.7°C | 23.0°C | 25.5°C | 21.2°C | 3 mm | 73% | 6.4 m/s | 6.6 |
| 2006 | 23.5°C | 22.9°C | 22.3°C | 24.8°C | 21.5°C | 44 mm | 77% | 7 m/s | 6.2 |
| 2005 | 24.5°C | 23.7°C | 22.9°C | 25.8°C | 22.0°C | 21 mm | 75% | 6.6 m/s | 6.5 |
| 2004 | 24.4°C | 23.6°C | 22.9°C | 25.9°C | 21.4°C | 36 mm | 77% | 5.9 m/s | 6.5 |
| 2003 | 24.5°C | 23.8°C | 23.0°C | 25.4°C | 22.6°C | 38 mm | 77% | 6.3 m/s | 6.5 |
| 2002 | 24.7°C | 23.8°C | 22.9°C | 26.2°C | 20.9°C | 38 mm | 78% | 4.4 m/s | 6.4 |
| 2001 | 23.8°C | 23.1°C | 22.4°C | 25.1°C | 21.3°C | 35 mm | 76% | 7.7 m/s | 6 |
| 2000 | 23.0°C | 22.3°C | 21.7°C | 23.8°C | 20.1°C | 20 mm | 75% | 7.6 m/s | 6 |
| 1999 | 23.4°C | 22.6°C | 21.9°C | 24.5°C | 21.1°C | 23 mm | 76% | 6.9 m/s | 6.8 |
| 1998 | 23.4°C | 22.7°C | 22.0°C | 24.3°C | 20.8°C | 7 mm | 72% | 7.8 m/s | 6.2 |
| 1997 | 24.8°C | 23.9°C | 23.0°C | 25.9°C | 21.8°C | 24 mm | 75% | 5.5 m/s | 6.3 |
| 1996 | 24.8°C | 24.0°C | 23.2°C | 26.7°C | 21.9°C | 10 mm | 77% | 5.7 m/s | 6.5 |
| 1995 | 23.4°C | 22.8°C | 22.1°C | 25.3°C | 20.4°C | 24 mm | 76% | 6.3 m/s | 5.9 |
| 1994 | 23.3°C | 22.6°C | 22.0°C | 24.1°C | 21.0°C | 10 mm | 76% | 7.1 m/s | 6 |
| 1993 | 24.0°C | 23.3°C | 22.7°C | 25.5°C | 21.9°C | 12 mm | 75% | 6.7 m/s | 6.2 |
| 1992 | 24.4°C | 23.4°C | 22.5°C | 26.3°C | 21.2°C | 9 mm | 71% | 4.1 m/s | 6.1 |
| 1991 | 23.5°C | 22.8°C | 22.1°C | 24.5°C | 21.1°C | 14 mm | 78% | 6.5 m/s | 6.1 |
| 1990 | 24.0°C | 23.2°C | 22.4°C | 25.4°C | 21.0°C | 71 mm | 78% | 4.5 m/s | 5.8 |
| 1989 | 22.9°C | 22.3°C | 21.7°C | 24.7°C | 20.5°C | 44 mm | 77% | 6.6 m/s | 5.5 |
| 1988 | 23.9°C | 23.2°C | 22.4°C | 24.7°C | 21.5°C | 45 mm | 77% | 6.5 m/s | 6.3 |
| 1987 | 23.4°C | 22.6°C | 21.8°C | 25.3°C | 19.7°C | 35 mm | 75% | 6 m/s | 5.8 |
| 1986 | 23.8°C | 23.2°C | 22.6°C | 25.2°C | 21.4°C | 102 mm | 81% | 7.3 m/s | 5.5 |
| 1985 ❄️ | 22.7°C | 22.0°C | 21.3°C | 23.8°C | 19.7°C | 88 mm | 77% | 5.6 m/s | 5.9 |
| 1984 | 23.9°C | 23.2°C | 22.5°C | 24.9°C | 21.5°C | 21 mm | 77% | 7 m/s | 6.2 |
| 1983 🌧️ | 23.3°C | 22.6°C | 22.0°C | 24.5°C | 20.4°C | 324 mm | 77% | 6 m/s | — |
| 1982 | 22.7°C | 22.1°C | 21.4°C | 24.7°C | 19.7°C | 68 mm | 80% | 6.1 m/s | — |
| 1981 | 24.2°C | 23.3°C | 22.5°C | 25.6°C | 21.9°C | 24 mm | 77% | 5.3 m/s | — |
Actual recorded April data for each year, 1981–2025 — sourced from NASA POWER.
The average high in April is around 24.1°C with lows near 22.6°C (mean 23.4°C), based on 45 years of NASA POWER data.
April averages 45 mm of rainfall in Kailua, about average for rainfall. The wettest on record was 324 mm in 1983.
The hottest April reached 27°C in 2025. The coldest dipped to 19.6°C in 2017.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average April temperatures have risen by about 1.6°C. Daytime highs moved from 23.4°C to 25°C and overnight lows from 21.9°C to 23.3°C over the same span.
April is one of the cooler months of the year in Kailua and about average for rainfall, so plan for around 24.1°C daytime highs and 22.6°C at night.
Not quite — April is the 4th coolest month in Kailua, averaging 23.4°C.
For April in Kailua, pack light layers you can adjust through the day, with typical highs of 24.1°C and lows of 22.6°C.
Relative humidity in April averages 77% — quite humid.
Average wind speed in April is 6.1 m/s. The windiest April on record averaged 7.8 m/s (1998).
The wettest April on record was 1983 with 324 mm. On average, April sees 45 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 Kailua 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.
