Waikiki sea temperatures peak in the range 26 to 28°C (79 to 82°F) on around the 26th of September and are at their coldest on about the 13th of February, in the range 24 to 25°C (75 to 77°F). Year round warm sea temperatures at Waikiki climb to their highest in the fourth week of September.
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They're actually really close. For example, in Kauai, which is the northernmost of the major Hawaiian Islands, ocean temperatures range from 77°F to 83°F. On the beach resort side of Hawaii (Big) Island, ocean temperatures range between 77°F and 81°F.
Water TemperaturesThe water temperature in Hawaii averages in the 70s, depending on the shore and time of year. Pacific Ocean temperatures on Honolulu shores are warmer than those of Hilo, but both are still swim-worthy at 77 and 73 degrees, respectively.
Best Time for Snorkeling and Swimming: Great swimming and snorkeling are possible year-round in Hawaii, but during summer months (May through September) water is warmer, waves are smaller, and skies are sunnier, making conditions ideal for these water-based activities.
Best Time for Snorkeling and Swimming: Great swimming and snorkeling are possible year-round in Hawaii, but during summer months (May through September) water is warmer, waves are smaller, and skies are sunnier, making conditions ideal for these water-based activities.
Summer is the best time to take a dip in the warm Hawaiian waters. The ocean temperature hovers around 82°, and the wind and surf are reliably low. Visitors of any experience level can enjoy snorkeling in the clear, calm summer sea.
Oahu. Oahu, also known as “The Gathering Place,” is home to some of the most iconic beaches in Hawaii, including world-famous Waikiki Beach, Lanikai Beach, and Sunset Beach. Waikiki Beach is one of the most popular beaches in the world and is known for its stunning views of Diamond Head, a volcanic cone.
Oahu's windward coast – specifically the 10-mile stretch from the Marine Corps Base Kaneohe to Makapu'u Beach Park – is home to the bluest water in Hawaii, sure to make your next beach day unforgettable.
The sediment in Hawaii's oceans is made up of volcanic rock, coral, and shells which are heavy and not easily stirred up. The sediment quickly settles on the ocean floor, keeping the water clear.
Hawaii is beautiful and warm all year long, with none of the seasonal variations you might expect when you're at home on the U.S. mainland. For instance, temperatures hover between the low 80s in the winter and the high 80s in the summer — hardly a reason for seasonal wardrobe changes!