The best time of year to dive in Guam depends on a few factors, including water temperature, visibility, and the type of marine life you want to see.
Generally, the water temperature in Guam ranges from 77-82°F (25-28°C) throughout the year, making it suitable for diving year-round. However, the water may be slightly cooler during the winter months (December to February) and slightly warmer during the summer months (June to August).
Visibility in Guam’s waters tends to be best from March to May and from September to November. During these months, visibility can range from 60-100 feet (18-30 meters).
The type of marine life you can expect to see can also vary by season. For example, if you are interested in seeing larger pelagic species, such as sharks and manta rays, the best time to visit is from June to September. If you want to see a greater variety of smaller marine life, such as nudibranchs and pygmy seahorses, the best time to visit is from November to May.
Overall, the best time to dive in Guam will depend on your personal preferences and what you hope to see while diving. It’s always a good idea to check the weather and water conditions before planning a dive trip to ensure that you have the best possible experience.