Not well-known at is deserves, Guam is the southernmost island in the Mariana islands chain and the largest (and most populous) island in Micronesia. Territory of the United States, the island itself is only 30 miles long (48km) and 4 to 12 miles wide (6-19km). But with its wide range of beaches and its exceptional coral reefs, Guam is home to some of the most majestical snorkeling spots in Western Pacific.

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Most of snorkeling spots are located on the west side of the island. Tumon Bay, Guam's main resort district, filled with hotels, oceanview restaurants and beach bars, is without doubt the busiest snorkeling spot on the island. But for those seeking more secluded reefs to explore, the island offers dozens of other snorkeling spots for all levels.

The most popular sites in the area are Gun Beach and FaiFai Beach (just a 5-minutes drive north of Tumon Bay), Ypao Beach (at the southern end of Tumon Bay, which is one of Guam’s five marine preserves), GabGab Beach, Haputo Beach, Piti Bomb Holes and Cabras Island (but you’ll generally need a boat to reach this last site). Spanish Steps, a shallow cove surrounded by cliffs, located at the very tip of Orote Peninsula, is also one of the best options. Most of snorkeling spots are free and easy to access, but be aware that some of them (Haputo, Spanish Steps) are located on US military installations and have limited access.

Snorkeling Report Guam
Blue starfish at Tumon Bay, FaiFai Beach, and Mailed butterflyfish at Gun Beach

Many snorkeling spots are accessible from the shore, edged by narrow fringing reefs ending in a drop off facing the open sea. The coral, which rise to the surface of the water, literally "drops" towards the ocean depths in a wealth of colours and shapes. 

For such a small island, Guam possesses a wealth of marine habitats that allow for exceptional diversity. The island’s reefs host over thousands of marine species (1000 species of reef fishes and 375 species of corals), including reef sharks, manta rays, angelfish, sea turtles and the very rare Maroon anemonefish (amphiprion tricinctus) endemic to Guam and the Marshall Islands.
When to go to Guam?

The climate on Guam is purely tropical, hot and humid all year round, but we can distinguish two main seasons. The dry season, from January to June, is the warmest and sunniest period, with an average temperature of 81°F/27°C. In the wet season, from July to December, the weather is wetter and more changeable (intermittent tropical rains and sunny spells), and the air is cooler (an average of 72°F/22°C). The island is subject to typhoons, which brings rain and strong winds, generally from mid-May to mid-November. Actually, the best time to go snorkeling Guam is from February to April, during the driest season, and out of the typhoon period.

Where to spot them?

Tomato clownfish

Relatively rare, try your luck on Tumon Bay's drop-off

Ornate butterflyfish

On all spots

Mailed butterflyfish

On all spots

Double-saddle butterflyfish

On all spots

Emperor angelfish

Rare, try your luck on Tumon Bay's drop-off

Clown surgeonfish

On all spots

Yellow tang

On all spots, but relatively rare

Reef triggerfish

On all spots, in shallow lagoons

Blue sea star

On all spots, very common at Tumon Bay