The average annual temperatures for Guam is 28°C/82°F.
Average annual rainfall for Guam is 2,866mm (113 inches).
May is the hottest or warmest month in Guam, with an average maximum temperate of 32°C/90°F.
January is the coolest or coldest month in Guam, with an average minimum temperate of 24°C/75°F.
September is the wettest or most rainy month in Guam, with an average rainfall of 484mm (19 inches).
March is the driest or least rainy month in Guam, with an average rainfall of 83mm (3 inches).