Scuba Diving in Guam

Guam (Territory of Guam; Chamorro: Guåhån) is a tropical island located at the southern end of the Mariana Islands (Chamorro: Islas Mariånas). It is washed by the Pacific Ocean and the Philippine Sea (Tagalog: Dagat Pilipinas). Guam lies along the Mariana Trench, 340 kilometres away from the Challenger Deep, the deepest spot in the ocean.
The northern part of the island consists primarily of coral while the southern half of the island has a volcanic origin. Since Guam is washed by both the sea and the ocean, it has a diverse underwater world. It also offers great water visibility between 22 and 40 metres. There are wrecks of sunken World War I and World War II warships just off Guam's coast. The Tokai Maru and the SMS Cormoran. The west coast of Guam has become one of the most popular dive locations. The currents here are weak or nearly absent.

Reasons to Visit

Where to go
in Guam?
The coastal waters of Guam are notable for a wide variety of fish species. This is due to the Pacific Ocean connecting to the Philippine Sea. You can observe friendly sharks, sea turtles, octopuses, crabs, local lobsters, clownfish, humphead wrasse, caridean shrimp, and colonies of sea anemones. Coral thickets are inhabited by tropical fish.
Wrecks are one of Guam's attractions. You can explore two sunken wartime ships in Apra Harbor: the German auxiliary cruiser SMS Cormoran scuttled in 1917 and the Japanese passenger-cargo ship Tokai Maru which sank in 1943. This place is unique because it is the only site in the world where wrecks from different time periods are located so close to one another.
Night diving is a rather popular activity on Guam. Some types of marine animals become more active at night, and the great water visibility allows to observe deep-sea landscapes in a new and unique light. Hap's Reef, also known as Guam's Underwater Zoo, is considered the best night diving destination. It is suitable for both experienced and beginner divers.
Black Coral Kingdom is a splendid underwater reef extending a 100 metres down. It is a sheer wall covered in black coral and sea fans. There are two tunnels in the wall. When diving here, you can watch a glimpse of some varicoloured tropical fish whose bright colours are attention-grabbing. Underwater photography enthusiasts can make a lot of great shots thanks to the good water visibility.
Pit's Reef is another picturesque site off the island of Guam which is popular among divers from all over the world. Beautiful tunnels and unusually shaped canyons could be explored here. You can come across clownfish and bright sea anemones that live in association with large numbers of shrimp. This site will be interesting for both beginner and experienced divers.
Memo Notes
Currency USD - United States dollar
Languages Chamorro, English
Timezone UTC +10
Phone code 1
Emergency Help 911

Type A - 110 V, 60 Hz

Type B - 110 V, 60 Hz

Dive Shops in Guam

Guam dive shops offer diving opportunities to experienced divers and diving training with a certified instructor for beginners. It is also possible to rent diving equipment, book a night dive or dive on remote dive sites.

Сlimate & Seasonality

Spring on Guam is fairly rain free. The air temperature stands at 30 ˚С, while the water warms up to 28 ˚С. In April and May, the thermometer reaches a 32-degree mark, the water heats up to 28 ˚С.


The island could be occasionally rainy in June. The air temperature reaches +34 ˚С, and the water warms up to +30 ˚С. The number of trains increases during July and August while the temperatures stay the same.


September is a rainy month in Guam. The air and water warm up to 33˚С and 29 ˚С accordingly. The weather remains the same in October. November marks the end of the rain season, and the sun comes out again.


There is almost no rainfall on the island in December. The air temperature reaches a +32-degree mark, and the water warms up to +29 ˚С. The heat subsides slightly in February. The air and water temperatures drop to +30 ˚С and 28 ˚С accordingly. This is the best time to visit the island.

high season
middle season
low season

The Best Dive Sites

Apra Harbor with its wrecks is a unique place on our planet. Shipwrecks from different eras lie close to one another. Blue Hole is a 100-meter deep natural pit populated by fish and coral. Double Reef is another amazing natural construction. It comprises two parallel reefs going down. Water depth of 5-20 metres is ideal for novice divers.

Health & Safety

Guam is a safe place, crime is rare here. The USA laws apply to the island.
Health services are expensive but of a good quality. However, even an initial consultation will cost you around two hundred dollars. Therefore, you should invest in a health insurance prior to the trip in order to avoid substantial expenses in the event of sickness. Vaccination against hepatitis A and B, as well as typhoid, is highly recommended. It is advisable to get vaccinated 6 months in advance prior to visiting the island.
Since local mosquitoes carry many diseases, it is recommended to use mosquito nets and repellents during your stay in Guam.
The island experiences occasional earthquakes.

Dangerous Marine Life

The red lionfish and venomous bottom fish are the most dangerous sea creatures found here. Do not try to pick up jellyfish, since their poisonous venom can cause an allergic reaction. It is recommended to wear special water shoes when you get in, in order to avoid injuries caused by sharp coral fragments or sea urchin spines.

Eat & Drinks

Guam's cuisine has been significantly influenced by the Spanish cuisine. The dishes have similar names and are prepared using similar cooking methods, however, there are some notable differences. Most of them are based on rice, beans, fish, and seafood. In order to get acquainted with Guam's cuisine, tourists should try Chamorro corn soup with potatoes, chicken, coconut milk, and corn. The most popular local dish is kelaguen made from coconuts, lemon juice and spices. It is served with chicken, beef or fish. Tuba is the most unusual local drink. It is a kind of wine made from coconut sap that has an incomparable taste. As in most tropical countries, it is recommended to avoid drinking tap water here. Bottled water would be the vest and safest option.