The climate of Guam can be described as a typical warm, tropical climate with two different seasons. The dry season is between December and April; the rainy season lasts from April to December, with the greatest falls between July and October. Temperatures range between 26-32°C, with the water temperature sitting on a comfortable year-round 28-29°C.
Typhoons can hit Guam from July to mid November, and can sometimes cause heavy damage, flooding and erosion. However, this is a seldom scenario, the routes of Typhoons usually are too far west to reach Guam, and not every Typhoon that hit Guam is a strong one.
Lightweight cotton clothing is advised throughout the year, with an umbrella or raincoat for sudden cloudbursts. No matter where you go, be prepared for high temperatures and humidity.
The Climate of Guam can be classified as Af climate, a hot, humid tropical climate with all months above 18°C.