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Guam

Guam © By Laura Beuregard
Guam Sea Temperature
This page provides detailed information about the water temperature in Guam. All countries, cities and resorts on the coast. The range of sea temperatures for today. We find every spot where you can swim and tell you what the water temperature is there today and throughout the year.
Current Sea Temperature
27.4°C
minimal
27.7°C
average
28.0°C
maximum
Graph of Sea Temperature Changes in Guam Over the Last 60 Days
The Warmest Places on the Seaside in Guam Today
The Most Popular Seaside Resorts in Guam
Seas and Oceans that Border Guam

Guam © By Curt Storlazzi
Water Temperature in Guam: General Trends and Swimming Opportunities
Guam, a U.S. territory in the western Pacific, enjoys warm, tropical waters year-round, providing excellent conditions for swimming and other water activities. The sea temperature around Guam typically ranges from 28°C (82°F) to 30°C (86°F), making it consistently inviting for swimmers. The island's tropical climate and calm, clear waters make it a popular destination for visitors looking to enjoy the ocean in a beautiful, serene environment.
Guam is surrounded by vibrant coral reefs and clear lagoons, making it an ideal location for swimming, snorkeling, and scuba diving. The warm waters are home to an abundance of marine life, including colorful fish, sea turtles, and corals, making underwater exploration particularly rewarding. Popular spots like Tumon Bay offer calm and shallow waters perfect for swimming and snorkeling, while the island’s more remote areas, such as Ritidian Point, provide pristine and less crowded environments for those looking for a peaceful aquatic experience.
In addition to swimming and snorkeling, Guam offers various other water activities such as kayaking, paddleboarding, and diving. The island’s diverse marine ecosystem, along with its warm, clear waters, also makes it a prime destination for diving enthusiasts. Whether you’re lounging by the beach, snorkeling in the lagoons, or exploring the underwater world, Guam offers an abundance of opportunities to enjoy its beautiful, inviting waters.
General Information and Geographical Location of Guam
Original name of the country: Guåhan
Guam is located in Australia and Oceania. The country is washed by the Pacific Ocean. Guam is a small country. To determine the temperature of water in it, we track only ten settlements or resorts. Link to Google Maps.
Guam Weather
Guam has a tropical marine climate, meaning it is warm and humid throughout the year with relatively stable temperatures. Average temperatures range from 76°F to 88°F (24°C to 31°C), with high humidity making the air feel warmer. The island experiences two main seasons: a dry season from December to June and a wet season from July to November. Rainfall is abundant, especially during the wet season, with annual precipitation averaging around 95 inches (2,400 mm). Trade winds from the northeast help moderate the heat, providing some relief from the humidity.
Guam is located in the western Pacific’s typhoon zone, meaning it is occasionally affected by strong tropical storms, especially between August and October. However, not every year brings direct impacts. Ocean temperatures remain warm year-round, averaging around 82°F (28°C), making the island ideal for water activities like snorkeling and diving. The dry season is the most pleasant time for visitors, with lower humidity and more sunshine, while the wet season brings frequent heavy showers and occasional storms.
Frequently Asked Questions About Guam and its Water Temperatures
What is the sea temperature today on the coast of Guam?
The sea temperature today on the coast of Guam ranges from from 81°F (27.4°C) in Piti to 82°F (28.0°C) in Tumon.
Which seas and oceans border Guam?
Guam is bordered only by the Pacific Ocean.
How long is the coastline in Guam?
According to The World Factbook, the length of Guam's coastline is 77 miles (125 km), but no data provided by World Resources Institute.
What is the best time for swimming and beach holidays on the coast of Guam?
In Guam, the average monthly water temperature does not drop below 68 degrees Fahrenheit (20 degrees Celsius) in any month of the year.
What is the sea temperature history in Guam?
Here are the ranges of sea temperatures in Guam by month based on historical data: in January from 78°F (26°C) to 86°F (30°C), in February from 78°F (26°C) to 84°F (29°C), in March from 78°F (26°C) to 84°F (29°C), in April from 78°F (26°C) to 86°F (30°C), in May from 80°F (27°C) to 86°F (30°C), in June from 80°F (27°C) to 87°F (31°C), in July from 82°F (28°C) to 87°F (31°C), in August from 82°F (28°C) to 87°F (31°C), in September from 80°F (27°C) to 87°F (31°C), in October from 80°F (27°C) to 87°F (31°C), in November from 82°F (28°C) to 87°F (31°C), in December from 80°F (27°C) to 86°F (30°C).