July is one of the warmer months of the year in Kailua, with average highs near 26.1°C and lows around 24.8°C (mean 25.5°C). It is one of the drier months, averaging 28 mm of rainfall and 78% relative humidity across the period.
July is one of the warmer months of the year in Kailua. Across 45 years of records, the warmest July in Kailua was 2019 — when the month averaged 26.9°C — while the coldest was 1998 at 24.3°C. Typical July days reach 26.1°C with nights near 24.8°C. The long-term trend is warming, about 0.3°C per decade.
July is one of the drier months in Kailua, averaging 28 mm of rainfall. The wettest July on record was 2016 with 84 mm, while the driest were 2007 and 2011 at 5 mm.
Relative humidity in Kailua during July averages 78%. The most humid July was 1982 at 81%, and the least humid was 1988 at 75%.
July receives about 6.8 kWh/m²/day of solar energy in Kailua. The sunniest Julys were 2004 and 2019 at 7.3 kWh/m²/day, and the cloudiest were 1986 and 1993 at 6.1.
Average wind speed in Kailua during July is 6.7 m/s. The windiest July was 1989 at 7.4 m/s, while the calmest was 2015 at 5.5 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 25.1°C | 25.1°C | 25.4°C | 25.8°C | 26.0°C | +0.9°C |
| Avg High | 25.7°C | 25.8°C | 26.1°C | 26.5°C | 26.7°C | +1°C |
| Avg Low | 24.4°C | 24.5°C | 24.8°C | 25.1°C | 25.2°C | +0.8°C |
| Avg Rain | 46 mm | 16 mm | 22 mm | 31 mm | 29 mm | -17 mm |
July temperatures in Kailua have risen by about 1°C between 1981–1985 and 2021–2025.
July has ranged from a record low of 22.9°C (1981) to a record high of 28.4°C (2015).
Rainfall in July is one of the drier months, averaging 28 mm, with a wettest year of 84 mm.
A good time to visit Kailua
July is a good time to visit Kailua, with days averaging 26.1°C and nights around 24.8°C (mean 25.5°C, warmer than Kailua's yearly average) and low rainfall. February and April are marginally more temperate, but July still suits most travellers.
| Year | Avg High | Avg Temp | Avg Low | Hottest Day | Coldest Day | Rainfall | Humidity | Wind | Solar |
|---|---|---|---|---|---|---|---|---|---|
| 2025 | 27.1°C | 26.2°C | 25.4°C | 27.9°C | 24.8°C | 11 mm | 77% | 6.7 m/s | 7.1 |
| 2024 | 26.7°C | 25.9°C | 25.1°C | 27.4°C | 24.3°C | 7 mm | 76% | 6.8 m/s | 6.8 |
| 2023 | 26.8°C | 26.1°C | 25.3°C | 27.3°C | 24.2°C | 10 mm | 77% | 6.9 m/s | 6.9 |
| 2022 | 26.4°C | 25.7°C | 24.9°C | 27.5°C | 24.4°C | 39 mm | 78% | 7.3 m/s | 6.9 |
| 2021 | 26.4°C | 25.8°C | 25.1°C | 26.9°C | 24.5°C | 43 mm | 79% | 7.3 m/s | 6.8 |
| 2020 | 27.0°C | 26.2°C | 25.5°C | 27.6°C | 24.8°C | 62 mm | 77% | 6.5 m/s | 6.8 |
| 2019 🔥 | 27.6°C | 26.9°C | 26.2°C | 28.2°C | 25.6°C | 21 mm | 77% | 6.6 m/s | 7.3 |
| 2018 | 26.6°C | 25.9°C | 25.3°C | 27.6°C | 24.5°C | 33 mm | 81% | 6.8 m/s | 6.4 |
| 2017 | 27.0°C | 26.3°C | 25.6°C | 27.7°C | 25.1°C | 23 mm | 78% | 6.3 m/s | 7.1 |
| 2016 🌧️ | 26.7°C | 26.0°C | 25.4°C | 28.1°C | 24.8°C | 84 mm | 80% | 6.4 m/s | 6.8 |
| 2015 | 27.4°C | 26.6°C | 25.8°C | 28.4°C | 24.9°C | 32 mm | 79% | 5.5 m/s | 7.2 |
| 2014 | 26.7°C | 26.1°C | 25.4°C | 27.7°C | 24.9°C | 58 mm | 78% | 6.5 m/s | 6.9 |
| 2013 | 26.4°C | 25.6°C | 24.8°C | 27.5°C | 23.6°C | 23 mm | 77% | 6 m/s | 7 |
| 2012 | 25.4°C | 24.7°C | 24.0°C | 26.4°C | 23.3°C | 15 mm | 77% | 7.1 m/s | 6.9 |
| 2011 | 25.6°C | 24.9°C | 24.2°C | 26.2°C | 23.7°C | 5 mm | 77% | 6.9 m/s | 7.1 |
| 2010 | 25.8°C | 25.1°C | 24.4°C | 26.5°C | 23.6°C | 16 mm | 76% | 6.3 m/s | 6.9 |
| 2009 | 26.2°C | 25.5°C | 24.9°C | 27.2°C | 23.9°C | 29 mm | 78% | 6.5 m/s | 6.9 |
| 2008 | 26.5°C | 25.7°C | 25.0°C | 27.2°C | 24.4°C | 15 mm | 77% | 6.2 m/s | 7.1 |
| 2007 | 26.2°C | 25.5°C | 24.8°C | 26.7°C | 24.4°C | 5 mm | 78% | 6.9 m/s | 7 |
| 2006 | 26.2°C | 25.5°C | 24.8°C | 27.0°C | 24.3°C | 20 mm | 76% | 6.8 m/s | 7.1 |
| 2005 | 26.2°C | 25.6°C | 24.9°C | 26.6°C | 24.2°C | 34 mm | 77% | 7.2 m/s | 7 |
| 2004 | 26.7°C | 26.0°C | 25.2°C | 27.5°C | 24.8°C | 21 mm | 77% | 6.4 m/s | 7.3 |
| 2003 | 26.1°C | 25.5°C | 24.8°C | 27.2°C | 23.9°C | 31 mm | 78% | 6.7 m/s | 6.9 |
| 2002 | 25.8°C | 25.1°C | 24.4°C | 27.4°C | 23.8°C | 30 mm | 79% | 6.8 m/s | 6.8 |
| 2001 | 25.9°C | 25.2°C | 24.5°C | 26.8°C | 23.9°C | 11 mm | 77% | 6.6 m/s | 7.1 |
| 2000 | 25.5°C | 24.9°C | 24.3°C | 26.1°C | 23.7°C | 27 mm | 79% | 7 m/s | 6.7 |
| 1999 | 25.2°C | 24.5°C | 23.8°C | 26.3°C | 22.9°C | 10 mm | 77% | 7 m/s | 6.8 |
| 1998 ❄️ | 25.0°C | 24.3°C | 23.7°C | 25.5°C | 23.0°C | 11 mm | 76% | 7.2 m/s | 6.8 |
| 1997 | 26.3°C | 25.7°C | 25.0°C | 28.2°C | 24.1°C | 16 mm | 76% | 7 m/s | 7 |
| 1996 | 26.3°C | 25.8°C | 25.2°C | 27.1°C | 24.6°C | 12 mm | 77% | 7 m/s | 6.8 |
| 1995 | 25.8°C | 25.3°C | 24.7°C | 26.6°C | 24.1°C | 8 mm | 78% | 7 m/s | 6.7 |
| 1994 | 25.9°C | 25.4°C | 24.8°C | 26.5°C | 24.4°C | 17 mm | 80% | 7.2 m/s | 6.2 |
| 1993 | 25.8°C | 25.1°C | 24.5°C | 27.0°C | 23.6°C | 34 mm | 78% | 6.5 m/s | 6.1 |
| 1992 | 26.3°C | 25.6°C | 24.9°C | 27.6°C | 24.2°C | 12 mm | 78% | 6.6 m/s | 6.4 |
| 1991 | 25.4°C | 24.7°C | 24.0°C | 26.6°C | 22.9°C | 21 mm | 79% | 6.2 m/s | 6.4 |
| 1990 | 25.5°C | 24.9°C | 24.2°C | 26.3°C | 23.4°C | 16 mm | 78% | 6.4 m/s | 6.5 |
| 1989 | 25.6°C | 25.0°C | 24.4°C | 26.4°C | 23.5°C | 52 mm | 79% | 7.4 m/s | 6.3 |
| 1988 | 26.1°C | 25.5°C | 24.8°C | 26.8°C | 23.8°C | 12 mm | 75% | 6.8 m/s | 6.7 |
| 1987 | 26.0°C | 25.3°C | 24.6°C | 26.9°C | 23.9°C | 36 mm | 80% | 6.4 m/s | 6.5 |
| 1986 | 26.0°C | 25.4°C | 24.8°C | 26.8°C | 23.9°C | 39 mm | 81% | 6.7 m/s | 6.1 |
| 1985 | 25.4°C | 24.8°C | 24.2°C | 26.6°C | 23.3°C | 74 mm | 80% | 6.2 m/s | 6.5 |
| 1984 | 25.7°C | 25.0°C | 24.3°C | 26.6°C | 23.6°C | 29 mm | 78% | 5.9 m/s | 6.7 |
| 1983 | 25.3°C | 24.6°C | 24.0°C | 25.8°C | 23.2°C | 71 mm | 80% | 7.2 m/s | — |
| 1982 | 25.8°C | 25.2°C | 24.6°C | 26.6°C | 23.9°C | 79 mm | 81% | 6.3 m/s | — |
| 1981 | 25.7°C | 25.0°C | 24.3°C | 26.6°C | 22.9°C | 19 mm | 78% | 6.2 m/s | — |
Actual recorded July data for each year, 1981–2025 — sourced from NASA POWER.
The average high in July is around 26.1°C with lows near 24.8°C (mean 25.5°C), based on 45 years of NASA POWER data.
July averages 28 mm of rainfall in Kailua, one of the drier months. The wettest on record was 84 mm in 2016.
The hottest July reached 28.4°C in 2015. The coldest dipped to 22.9°C in 1981.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average July temperatures have risen by about 1°C. Daytime highs moved from 25.6°C to 26.7°C and overnight lows from 24.3°C to 25.2°C over the same span.
July is one of the warmer months of the year in Kailua and one of the drier months, so plan for around 26.1°C daytime highs and 24.8°C at night.
Not quite — July is the 9th coolest month in Kailua, averaging 25.5°C.
For July in Kailua, pack light layers you can adjust through the day, with typical highs of 26.1°C and lows of 24.8°C.
Relative humidity in July averages 78% — quite humid.
Average wind speed in July is 6.7 m/s. The windiest July on record averaged 7.4 m/s (1989).
The wettest July on record was 2016 with 84 mm. On average, July sees 28 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 July, 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 July specifically, along with year-by-year records and how the month has changed over the decades.
