Question 1

Is the North Shore of Oahu safe to swim?

Accepted Answer

The North Shore typically has good water quality during summer (May through September) when the ocean is typically calm and water quality is excellent. During winter (October through April), the North Shore receives massive swells from the North Pacific that can reach 20-40+ feet at surf spots like Pipeline, Sunset Beach, and Waimea Bay. These waves are life-threatening for recreational swimmers. Water quality year-round is excellent with a 1 out of 5 bacteria risk &mdash; the main concern is physical wave danger, not bacteria. Always check surf reports before swimming on the North Shore.

Question 2

What is the water quality like at Sunset Beach?

Accepted Answer

Sunset Beach historically rates at low bacteria levels with a 1 out of 5 bacteria risk. The North Shore has minimal urban development and almost no significant watershed runoff. Sunset Beach State Recreation Area is a long, wide sandy beach with consistently clear water. In summer the water is calm and families swim here regularly. In winter, the beach is closed to swimming during large swells and the powerful rip currents can be deadly even for strong swimmers.

Question 3

Can you snorkel at Sharks Cove on the North Shore?

Accepted Answer

Sharks Cove at Pupukea Beach Park is one of O'ahu's best snorkeling and diving spots and is excellent in summer. The protected cove features underwater lava formations, diverse marine life, and excellent visibility of 40-80 feet. Water quality is outstanding (1/5 risk). However, Sharks Cove is only suitable in calm conditions &mdash; when winter swells arrive, the cove fills with dangerous surge. It is strictly a summer activity site.

Question 4

Is Waimea Bay safe to swim?

Accepted Answer

Waimea Bay has low bacteria risk and calm conditions in summer when the bay is flat. The water is clear, bacteria risk is low (1/5), and the large sand beach provides easy access. The famous rock jumping spot (the large rock on the north side of the bay) is a North Shore landmark. In winter, Waimea Bay hosts some of the largest rideable waves in the world, including the Eddie Aikau Invitational, held only when waves exceed 30 feet. Never swim at Waimea Bay during winter swells.

Question 5

When is the best time to swim on the North Shore of Oahu?

Accepted Answer

The best time to swim on O'ahu's North Shore is May through September. During these months, the North Pacific swell season is over and the water is typically calm and flat. June, July, and August are the most reliably calm months. Water temperature averages 78-82F, water clarity is excellent, and you can swim, snorkel, and paddleboard safely at nearly all North Shore beaches. After significant rain on the mountains above Haleiwa and Pupukea, wait 48-72 hours before entering any North Shore water.