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The climate of Guam
The current climate in Guam features temperatures ranging from a high of 32°C to a low of 30°C throughout the year. The average yearly temperature is around 31°C. At night, temperatures in the colder months average around 24°C and in the warmer months around 26°C.
Average temperatures and precipitation
This chart shows the average monthly maximum and minimum temperatures (in degrees Celsius) and average monthly rainfall (in millimeters) for Guam.
Temperature records
The highest temperature recorded in Guam in recent years was 37°C in August 2021. The lowest daytime temperature recorded was 25°C in March 2017.
Rainfall amount
On average, Guam receives 4209 mm of precipitation each year. For comparison, New York gets 1142 mm of precipitation annually.
Best time to visit Guam?
The best time to visit Guam for mild to warm weather is February up to April. You might get some rain, but the temperatures are just right to explore Guam.
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Climate Table of Guam
The climate table of Guam shows the average temperatures, rainfall, and UV index per month. The table provides an overview of the average day and night temperatures in degrees Celsius, the total amount of rainfall in millimeters, the total snowfall in centimeters, and the UV index for each month. Rainfall is always measured as water, even if it's snow or hail.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
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| Temp. max (°C) | 30 | 30 | 31 | 31 | 32 | 32 | 31 | 31 | 31 | 31 | 31 | 31 |
| Temp. min (°C) | 25 | 25 | 25 | 26 | 27 | 27 | 26 | 26 | 26 | 26 | 26 | 26 |
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| Precipitation (mm) | 252 | 164 | 72 | 135 | 256 | 223 | 563 | 683 | 643 | 637 | 346 | 235 |
| UV Index | 5 | 6 | 6 | 7 | 6 | 6 | 5 | 5 | 5 | 5 | 4 | 5 |
Click on the month name to see more weather details, like daily averages, temperatures, and precipitation for the past years in that month.
Temperature charts
These charts display the average temperatures in Guam. The temperatures are shown in degrees Celsius and are calculated based on data from the past 10 years.
Average Temperature per Month in Guam
Yearly Temperature in Guam
Precipitation charts
These charts show the average amount of precipitation in Guam. Precipitation is always measured as water, even when it falls as snow or hail. The amount of precipitation is displayed in millimeters, while snowfall is shown in centimeters.
Average Precipitation per Month in Guam
Total Yearly Precipitation in Guam
UV index chart
This chart shows the average UV index per month in Guam. The UV index indicates the intensity of ultraviolet radiation and ranges from 0 to a maximum of 11.
Average UV Index per Month in Guam
Weather experiences in Guam
The weather in Guam is rated an average of 4 out of 5 stars by 11 visitors. Have you been to Guam? Share your weather experience to help other visitors.
Amber Maarleveld
The sky was clear and there were beautiful sunsets.
OlafAll in all, a great experience.
TamaraThe heat was intense, but the many hours of sunshine made up for it. It rained several days, which cooled it down a bit. In short: beautiful weather!
Tijn van OlstFor an unashamed sun worshipper, the brilliant sun was heavenly and the evenings remained surprisingly warm. The sun shone constantly, but sometimes thunderstorms played against us.
Joep VereijkenRegular rainfall caused some inconvenience, but fortunately this was short-lived.
Yente LingenThe evenings cooled off pleasantly and provided a good night's sleep. There were occasional tropical showers, but they were brief and refreshing.
LianneIt was tropically warm, perfect for the beach and outdoor activities. In the evening it was pleasantly cool.
Fieke van SwaaijIt was hot, averaging 30 degrees, but not too hot. The light rain was pleasant and refreshing. The perfect escape from the winter cold!
VictorTropical temperatures that may even rise and occasional showers. In short, wonderful weather!
SvenNot too hot, not too chilly. There will be isolated, brief showers. Ideal for anyone who likes a mild, humid climate.
Tessa van der VlistA wonderful combination of sunshine and some rain with temperatures around 28 degrees Celsius. Ideal for anyone who loves a warm Christmas. One small downside, it gets dark quite early.
Have you been to Guam?
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Average weather in Guam by month
Click on a month below to see detailed weather info for Guam. Based on historical weather data, you can see the average temperature, precipitation, wind, and UV index for each day of the month.