December is one of the cooler months of the year in Ewa Beach, with average highs near 24.9°C and lows around 22.4°C (mean 23.7°C). It is a relatively wet time of year, averaging 89 mm of rainfall and 76% relative humidity across the period.
December is one of the cooler months of the year in Ewa Beach. Across 45 years of records, the warmest December in Ewa Beach was 2024 — when the month averaged 25.3°C — while the coldest was 1982 at 22°C. Typical December days reach 24.9°C with nights near 22.4°C. The long-term trend is warming, about 0.3°C per decade.
December is a relatively wet time of year in Ewa Beach, averaging 89 mm of rainfall. The wettest December on record was 1982 with 322 mm, while the driest was 2024 at 8 mm.
Relative humidity in Ewa Beach during December averages 76%. The most humid December was 2008 at 80%, and the least humid was 1994 at 70%.
December receives about 4 kWh/m²/day of solar energy in Ewa Beach. The sunniest December was 2005 at 4.6 kWh/m²/day, and the cloudiest were 1987, 1992 and 2008 at 3.6.
Average wind speed in Ewa Beach during December is 5.2 m/s. The windiest Decembers were 2001 and 2007 at 7.1 m/s, while the calmest was 2009 at 3.4 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 23.0°C | 23.3°C | 23.8°C | 23.8°C | 24.6°C | +1.6°C |
| Avg High | 24.3°C | 24.5°C | 25.1°C | 25.0°C | 25.9°C | +1.6°C |
| Avg Low | 21.9°C | 22.1°C | 22.5°C | 22.6°C | 23.3°C | +1.4°C |
| Avg Rain | 128 mm | 43 mm | 73 mm | 107 mm | 102 mm | -26 mm |
December temperatures in Ewa Beach have risen by about 1.8°C between 1981–1985 and 2021–2025.
December has ranged from a record low of 18.7°C (1988) to a record high of 27.6°C (1995).
Rainfall in December is a relatively wet time of year, averaging 89 mm, with a wettest year of 322 mm.
A good time to visit Ewa Beach
December is a good time to visit Ewa Beach, with days averaging 24.9°C and nights around 22.4°C (mean 23.7°C, close to Ewa Beach's yearly average) and higher rainfall. February and March are marginally more temperate, but December still suits most travellers.
| Year | Avg High | Avg Temp | Avg Low | Hottest Day | Coldest Day | Rainfall | Humidity | Wind | Solar |
|---|---|---|---|---|---|---|---|---|---|
| 2025 | 26.0°C | 24.8°C | 23.6°C | 27.4°C | 22.4°C | 72 mm | 76% | 4 m/s | — |
| 2024 🔥 | 26.9°C | 25.3°C | 23.7°C | 27.6°C | 22.8°C | 8 mm | 72% | 4.3 m/s | 4.5 |
| 2023 | 25.5°C | 24.2°C | 22.9°C | 27.5°C | 21.5°C | 32 mm | 76% | 5.1 m/s | 4 |
| 2022 | 25.8°C | 24.5°C | 23.2°C | 26.6°C | 21.7°C | 108 mm | 76% | 4.7 m/s | 4.1 |
| 2021 | 24.8°C | 23.7°C | 22.7°C | 26.3°C | 20.6°C | 321 mm | 80% | 6.2 m/s | 3.7 |
| 2020 | 26.2°C | 24.9°C | 23.6°C | 27.3°C | 22.6°C | 74 mm | 78% | 4.9 m/s | 4.4 |
| 2019 | 25.9°C | 24.8°C | 23.7°C | 27.4°C | 22.9°C | 144 mm | 79% | 5.7 m/s | 4 |
| 2018 | 24.8°C | 23.7°C | 22.6°C | 26.0°C | 21.3°C | 100 mm | 78% | 6.1 m/s | 4.2 |
| 2017 | 24.0°C | 22.7°C | 21.3°C | 25.4°C | 20.1°C | 108 mm | 76% | 4.4 m/s | 3.9 |
| 2016 | 24.7°C | 23.6°C | 22.4°C | 26.2°C | 20.4°C | 99 mm | 79% | 4.6 m/s | 3.8 |
| 2015 | 25.6°C | 24.4°C | 23.3°C | 26.6°C | 21.9°C | 57 mm | 78% | 5.7 m/s | 4.4 |
| 2014 | 24.6°C | 23.3°C | 22.0°C | 26.3°C | 19.0°C | 74 mm | 75% | 5 m/s | 4.1 |
| 2013 | 25.6°C | 24.2°C | 22.9°C | 27.4°C | 21.5°C | 82 mm | 78% | 3.8 m/s | 4.2 |
| 2012 | 25.2°C | 24.0°C | 22.7°C | 26.3°C | 21.6°C | 52 mm | 77% | 5.3 m/s | 3.9 |
| 2011 | 24.4°C | 23.3°C | 22.2°C | 25.8°C | 21.1°C | 73 mm | 78% | 6.6 m/s | 4.3 |
| 2010 | 25.2°C | 24.0°C | 22.9°C | 26.6°C | 21.5°C | 283 mm | 78% | 3.5 m/s | 3.7 |
| 2009 | 25.1°C | 23.6°C | 22.1°C | 26.1°C | 20.7°C | 24 mm | 74% | 3.4 m/s | 4.3 |
| 2008 | 24.8°C | 23.8°C | 22.7°C | 25.9°C | 21.7°C | 163 mm | 80% | 4.7 m/s | 3.6 |
| 2007 | 25.0°C | 24.0°C | 23.0°C | 26.5°C | 22.2°C | 51 mm | 77% | 7.1 m/s | 3.9 |
| 2006 | 25.2°C | 23.9°C | 22.7°C | 26.2°C | 21.7°C | 41 mm | 75% | 5.7 m/s | 4.2 |
| 2005 | 25.5°C | 24.0°C | 22.4°C | 27.2°C | 20.8°C | 15 mm | 73% | 3.9 m/s | 4.6 |
| 2004 | 25.2°C | 24.0°C | 22.8°C | 26.8°C | 20.8°C | 129 mm | 75% | 4.8 m/s | 3.8 |
| 2003 | 24.8°C | 23.6°C | 22.4°C | 25.8°C | 20.8°C | 161 mm | 78% | 5.3 m/s | 4 |
| 2002 | 25.1°C | 23.6°C | 22.1°C | 26.2°C | 21.0°C | 29 mm | 75% | 5.1 m/s | 4.5 |
| 2001 | 24.7°C | 23.6°C | 22.6°C | 25.8°C | 20.9°C | 97 mm | 76% | 7.1 m/s | 4.1 |
| 2000 | 25.7°C | 24.0°C | 22.4°C | 26.6°C | 21.6°C | 19 mm | 73% | 4.3 m/s | 4.5 |
| 1999 | 24.3°C | 23.1°C | 22.0°C | 25.3°C | 19.6°C | 33 mm | 79% | 5.8 m/s | 3.8 |
| 1998 | 24.3°C | 23.0°C | 21.8°C | 25.8°C | 20.4°C | 31 mm | 76% | 6.1 m/s | 4 |
| 1997 | 24.1°C | 22.9°C | 21.6°C | 25.8°C | 19.8°C | 10 mm | 72% | 6.5 m/s | 4.1 |
| 1996 | 24.1°C | 22.8°C | 21.5°C | 25.6°C | 19.0°C | 53 mm | 74% | 6.2 m/s | 3.8 |
| 1995 | 26.1°C | 24.8°C | 23.4°C | 27.6°C | 20.0°C | 17 mm | 74% | 4.1 m/s | 4.1 |
| 1994 | 24.1°C | 22.9°C | 21.7°C | 24.9°C | 20.7°C | 28 mm | 70% | 6.6 m/s | 4.1 |
| 1993 | 24.2°C | 23.1°C | 22.0°C | 25.2°C | 21.0°C | 14 mm | 71% | 6 m/s | 4 |
| 1992 | 25.2°C | 24.1°C | 23.1°C | 26.3°C | 21.7°C | 38 mm | 77% | 5.7 m/s | 3.6 |
| 1991 | 24.6°C | 23.5°C | 22.4°C | 26.4°C | 20.3°C | 38 mm | 75% | 6 m/s | 3.7 |
| 1990 | 23.8°C | 22.8°C | 21.7°C | 25.2°C | 19.4°C | 168 mm | 79% | 5.9 m/s | 3.7 |
| 1989 | 24.1°C | 22.8°C | 21.5°C | 26.3°C | 19.5°C | 74 mm | 73% | 3.9 m/s | 4.1 |
| 1988 | 25.5°C | 24.2°C | 22.9°C | 27.3°C | 18.7°C | 55 mm | 75% | 5.2 m/s | 4 |
| 1987 | 24.8°C | 23.7°C | 22.5°C | 26.0°C | 20.1°C | 108 mm | 80% | 5.2 m/s | 3.6 |
| 1986 | 24.7°C | 23.4°C | 22.1°C | 25.9°C | 20.7°C | 45 mm | 75% | 4.8 m/s | 3.9 |
| 1985 | 23.7°C | 22.4°C | 21.2°C | 26.0°C | 19.2°C | 134 mm | 77% | 4.5 m/s | 4 |
| 1984 | 24.3°C | 23.1°C | 22.0°C | 25.7°C | 20.3°C | 74 mm | 76% | 5.1 m/s | 3.7 |
| 1983 | 23.8°C | 22.7°C | 21.6°C | 25.5°C | 19.1°C | 267 mm | 77% | 3.9 m/s | — |
| 1982 ❄️ 🌧️ | 23.0°C | 22.0°C | 21.0°C | 25.4°C | 19.4°C | 322 mm | 80% | 5.2 m/s | — |
| 1981 | 24.4°C | 23.1°C | 21.9°C | 25.3°C | 20.0°C | 74 mm | 78% | 5.1 m/s | — |
Actual recorded December data for each year, 1981–2025 — sourced from NASA POWER.
The average high in December is around 24.9°C with lows near 22.4°C (mean 23.7°C), based on 45 years of NASA POWER data.
December averages 89 mm of rainfall in Ewa Beach, a relatively wet time of year. The wettest on record was 322 mm in 1982.
The hottest December reached 27.6°C in 1995. The coldest dipped to 18.7°C in 1988.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average December temperatures have risen by about 1.8°C. Daytime highs moved from 23.8°C to 25.8°C and overnight lows from 21.5°C to 23.2°C over the same span.
December is one of the cooler months of the year in Ewa Beach and a relatively wet time of year, so plan for around 24.9°C daytime highs and 22.4°C at night.
Not quite — December is the 5th coolest month in Ewa Beach, averaging 23.7°C.
For December in Ewa Beach, pack light layers you can adjust through the day, with typical highs of 24.9°C and lows of 22.4°C. Bring an umbrella or light rain jacket too.
Relative humidity in December averages 76% — quite humid.
Average wind speed in December is 5.2 m/s. The windiest December on record averaged 7.1 m/s (2001).
The wettest December on record was 1982 with 322 mm. On average, December sees 89 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 Ewa Beach behaves each December, 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 December specifically, along with year-by-year records and how the month has changed over the decades.
