The average water temperature of the Pacific Ocean varies according to location. In some regions near the equator, such as Guam, the ocean temperature reaches 86 degrees Fahrenheit, while near the poles, the water temperature dips to 2 below zero.
On Pacific coastlines around the Untied States, average water temperatures range between 50 F and 69 F depending upon the season and location. The average temperature along California's coastline is between 58 F and 68 F in the summer months, while Oregon and Washington's coastline temperatures fall anywhere between 51 F and 68 F during these same months. The warmest average temperatures near the United States are on Hawaii's coastlines and range from 74 F to 81 F.