Guam Climate
Unincorporated territories of the United States
When Is the Best Time To Visit Guam?
The answer to the question of what is the best month to visit Guam depends on what you are interested in doing during your stay. Here you can see an overview of each month and its typical weather conditions.
Climate of Guam
Guma is located in a humid equatorial climate zone tempered by the northeastern stripes. The weather is characterized by high temperatures ranging from 25°C - 32°C and humidity levels of up to 70%. Water temperature also remains consistently high at around 28°C. Precipitation varies and oscillates between 2000 mm - 3000 mm per year.
On the island we can distinguish between the dry and rainy seasons.
The rainy season covers the time from July to December. The frequency and intensity of rainfall and thunderstorms increases, and it is also hotter and more humid, although at the same time there is no shortage of sunny and bright days.
The dry season lasts from January to June, bringing the most favorable weather. Slightly cooler and sunny days attract tourists, and the precipitation that occurs in no way impedes leisure activities.
Friday 19 SepUpdate 2025-09-18 20:58 CET. Powered by Visual Crossing Weather.
Humidity
84%Cloud cover
97%Wind speed
15.4 mphChance of rain
100%Saturday 20 SepUpdate 2025-09-18 20:58 CET. Powered by Visual Crossing Weather.
Humidity
83%Cloud cover
99%Wind speed
13 mphChance of rain
84%Sunday 21 SepUpdate 2025-09-18 20:58 CET. Powered by Visual Crossing Weather.
Humidity
81%Cloud cover
100%Wind speed
15.9 mphChance of rain
84%Monday 22 SepUpdate 2025-09-18 20:58 CET. Powered by Visual Crossing Weather.
Humidity
89%Cloud cover
99%Wind speed
15 mphChance of rain
90%Tuesday 23 SepUpdate 2025-09-18 20:58 CET. Powered by Visual Crossing Weather.
Humidity
81%Cloud cover
90%Wind speed
13.7 mphChance of rain
87%Climate and Average Weather in Guam
General weather conditions each month by city.
Weather Map
The icons next to the month name indicate the convenience of the date for visiting the selected area/territory/ country. They are only a suggestion and should not be used as the final criterion for selecting your travel date. The season is defined as the time period with the weather favorable for sightseeing (or sunbathing - small island countries) for the average tourist. For countries with a large geographical range, the most touristic places were included.