Guam Weather, climate and geography
Temperatures are pretty constant. Only on rare occasions does the temperature dip below 21.1°C (70°F) or above 32.2°C (90°F). Average humidity is 66% but easterly trade winds of 6.4k-19.3 kph (4-12 mph) offset the dampness. The wet season is July through November, with transitional months being June and December. The best time to visit is Jan-May, the dry season.