Hilo receives its highest rainfall in Apr, while humidity peaks in autumn.
🌧️ Wettest:Apr — 235 mm☀️ Driest:Jun — 86 mm
💧 Humidity peaks at 83% in Nov · annual avg 82%
🌍 Climate Summary
Avg Annual Temp:71.6°F
Avg Annual Rainfall:1816 mm
Avg Humidity:82%
Data Period:1981 – 2025
Hilo Climate Overview
Hilo 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 spring and early summer months.
Humidity remains high throughout the year, especially in autumn, creating warm and humid conditions.
📈 Yearly Trends
The warmest year in Hilo's recorded history was 1996
(avg: 73.8°F),
while the coldest year was 1983
(avg: 69.6°F),
based on annual average temperatures.
📊 Key Climate Trends
🌡️ Hilo's temperature shows a slight warming trend 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
Hilo's temperatures shows a slight warming trend over the past decade.
The highest recorded temperature reached
84.5°F in May 1997,
while the lowest dropped to
57.6°F in Feb 1995.
🌧️ Annual Precipitation
View Range:
Total annual precipitation · Last 10 years · mm/year
Annual rainfall in Hilo 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 Hilo, Hawaii, with average high temperatures around 79.8°F.
What is the coldest month in Hilo?▼
Feb is the coldest month in Hilo, with average low temperatures around 61.7°F.
What is the rainiest month in Hilo?▼
Apr receives the most rainfall with approximately 235 mm, while Jun is the driest with 86 mm.
What was the highest temperature ever recorded in Hilo?▼
The highest recorded temperature was 84.5°F in May 1997. This is part of the historical record spanning 1981–2025.
What was the lowest temperature ever recorded in Hilo?▼
The lowest recorded temperature was 57.6°F in Feb 1995.
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 Hilo get?▼
Hilo receives the most sunlight in Jul with an average solar radiation of 6.12 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.