Guam's Southern Coast faces the Philippine Sea and offers the widest variety of dive formats on the island, with sites ranging from shallow coral gardens to walls, wrecks, caves, and drift dives. Depths across the region's sites run from very shallow to around thirty-five metres, suiting both beginners and intermediate divers. The volcanic and reef topography produces encounters with Napoleon wrasse, green sea turtles, giant moray, and whale sharks. Water temperature holds warm year-round, climbing slightly warmer from mid-year through to late year. Shore and boat entry are both available, and sites near Agat, Santa Rita, and Umatac serve as convenient bases.
Monthly water temperature across Southern Coast's sites, from satellite sea-surface data corrected for depth. The band shows the site-to-site spread.
Water temperature stays consistently warm throughout the year, rising slightly through the middle and latter months. This means a light wetsuit or skin suit is sufficient at any time of year, and there is no poor season for diving here.
Water temperature around Southern Coast ranges from about 28°C in January to 30°C in July, based on satellite sea-temperature data for its dive sites.
With water around 28–30°C, a rash guard or 3mm shorty works in Southern Coast year-round.
Fin maps 7 sites in Southern Coast (7 scuba diving sites).
2 more sites to explore
