Hagatna receives its highest rainfall in Aug, while humidity peaks during summer months.
🌧️ Wettest:Aug — 273 mm☀️ Driest:Mar — 36 mm
💧 Humidity peaks at 82% in Aug · annual avg 80%
🌍 Climate Summary
Avg Annual Temp:82°F
Avg Annual Rainfall:1492 mm
Avg Humidity:80%
Data Period:1981 – 2025
Hagatna Climate Overview
Hagatna has a warm subtropical climate with warm summers and mild winters.
Temperatures peak in Jul and drop to their lowest in Feb,
while rainfall is highest during summer months.
Humidity remains high throughout the year creating warm and humid conditions.
📈 Yearly Trends
The warmest year in Hagatna's recorded history was 2025
(avg: 83.1°F),
while the coldest year was 1993
(avg: 80.8°F),
based on annual average temperatures.
📊 Key Climate Trends
🌡️ Hagatna's temperature has remained relatively stable over the past decade
📊 Minimum temperatures have remained largely stable across the dataset
🌧️ Rainfall has increased noticeably in recent years compared to earlier periods
🌡️ Annual Temperature Trend
View Range:
Average annual high/low · Last 10 years · °F
Hagatna's temperatures has remained relatively stable over the past decade.
The highest recorded temperature reached
86.9°F in Aug 2024,
while the lowest dropped to
75.8°F in Mar 1983.
🌧️ Annual Precipitation
View Range:
Total annual precipitation · Last 10 years · mm/year
Annual rainfall in Hagatna shows noticeable variation. Rainfall has increased noticeably in recent years compared to earlier periods.
Based on 45 years of data (1981–2025), Jul is typically the hottest month in Hagatna, Guam, with average high temperatures around 85.1°F.
What is the coldest month in Hagatna?▼
Feb is the coldest month in Hagatna, with average low temperatures around 78.5°F.
What is the rainiest month in Hagatna?▼
Aug receives the most rainfall with approximately 273 mm, while Mar is the driest with 36 mm.
What was the highest temperature ever recorded in Hagatna?▼
The highest recorded temperature was 86.9°F in Aug 2024. This is part of the historical record spanning 1981–2025.
What was the lowest temperature ever recorded in Hagatna?▼
The lowest recorded temperature was 75.8°F in Mar 1983.
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 Hagatna get?▼
Hagatna receives the most sunlight in Apr with an average solar radiation of 6.69 kWh/m²/day. This solar radiation data, sourced from NASA POWER, is useful for solar energy planning, agriculture, and understanding seasonal sunshine availability in Guam.
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.