The climate is characterized as tropical marine.
The weather is generally hot and very humid with little seasonal temperature variation. The mean high temperature is 86 °F (30 °C) and mean low is 76 °F (24 °C) with an average annual rainfall of 96 inches (2,180 mm).
Guam lies between 13.2°N and 13.7°N and between 144.6°E and 145.0°E, and has an area of 212 square miles (549 km2), making it the 32nd largest island of the United States.
Guam is in the western Pacific Ocean and is an organized, unincorporated territory of the United States. It is one of five U.S. territories with an established civilian government. The island's capital is Hagatna. Guam is the largest and southernmost of the Mariana Islands.