Waipahu receives its highest rainfall in Dec, while humidity peaks during winter months.
🌧️ Wettest:Dec — 89 mm☀️ Driest:Jun — 28 mm
💧 Humidity peaks at 76% in Dec · annual avg 75%
🌍 Climate Summary
Avg Annual Temp:76.1°F
Avg Annual Rainfall:750 mm
Avg Humidity:75%
Data Period:1981 – 2025
Waipahu Climate Overview
Waipahu has a warm subtropical climate with warm summers and mild winters.
Temperatures peak in Sep and drop to their lowest in Feb,
while rainfall is highest during winter months.
Humidity remains moderate throughout the year, especially during winter months, creating warm and humid conditions.
📈 Yearly Trends
The warmest year in Waipahu's recorded history was 2025
(avg: 78.4°F),
while the coldest year was 1983
(avg: 73.4°F),
based on annual average temperatures.
📊 Key Climate Trends
🌡️ Waipahu's temperature has remained relatively stable over the past decade
📈 Minimum temperatures show a slight warming trend in recent years
🌧️ Rainfall has decreased in recent years compared to earlier periods
🌡️ Annual Temperature Trend
View Range:
Average annual high/low · Last 10 years · °F
Waipahu's temperatures has remained relatively stable over the past decade.
The highest recorded temperature reached
87°F in Sep 2014,
while the lowest dropped to
62.8°F in Feb 1981.
🌧️ Annual Precipitation
View Range:
Total annual precipitation · Last 10 years · mm/year
Annual rainfall in Waipahu shows noticeable variation. Rainfall has decreased in recent years compared to earlier periods.
Based on 45 years of data (1981–2025), Sep is typically the hottest month in Waipahu, Hawaii, with average high temperatures around 84.1°F.
What is the coldest month in Waipahu?▼
Feb is the coldest month in Waipahu, with average low temperatures around 66.6°F.
What is the rainiest month in Waipahu?▼
Dec receives the most rainfall with approximately 89 mm, while Jun is the driest with 28 mm.
What was the highest temperature ever recorded in Waipahu?▼
The highest recorded temperature was 87°F in Sep 2014. This is part of the historical record spanning 1981–2025.
What was the lowest temperature ever recorded in Waipahu?▼
The lowest recorded temperature was 62.8°F in Feb 1981.
How many years of data does this page cover?▼
This page covers 45 years of climate data from 1981 to 2025. As new data is added to the database the page automatically reflects the updated coverage.
How much sunlight does Waipahu get?▼
Waipahu receives the most sunlight in Jun with an average solar radiation of 7.06 kWh/m²/day. This solar radiation data, sourced from NASA POWER, is useful for solar energy planning, agriculture, and understanding seasonal sunshine availability in Hawaii.
Where does this weather data come from?▼
All climate data is sourced from NASA POWER (Prediction Of Worldwide Energy Resources), based on MERRA-2 satellite and model data. It provides monthly averages for temperature, precipitation, humidity, wind speed, and solar radiation.
📚 Data Source
All weather data is sourced from NASA POWER (Prediction of Worldwide Energy Resources), a NASA project providing solar and meteorological data for renewable energy, building efficiency, and agricultural research.