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Guam Standard Time is 10 hours ahead of Greenwich Mean Time ( GMT+10 ).
Guam Climate & Temperature. 1  Guam, Mariana Islands is at 1328'N, 14447'E, 75 m (247 ft). 2  Guam has a tropical wet climate (Kppen-Geiger classification: Af) with no dry or cold season as it is constantly moist (year-round rainfall).  The mean temperature is 27.5 degrees Celsius (81.5 degrees Fahrenheit).