One island holds a protected volcanic bay, a summer-only lava-rock cove, a power plant outflow that draws dolphins and rays, and the turtles of Waikiki. The season and the calm coast decide which one you swim.
Snorkeling is easy on Oahu because the choices sit so close together. The south shore around Honolulu stays swimmable most of the year. Hanauma Bay is a protected, reservation-only reef that most first-time visitors start with, and Waikiki has a marine life conservation district and boat trips to a spot locals call Turtle Canyon. On the leeward Waianae coast, Electric Beach and the Ko Olina lagoons stay calmer in winter.
The North Shore flips with the seasons. From about May to September, Sharks Cove and Three Tables are clear and calm enough for a swim. From about October to April, big swells make them dangerous, and most people head south or west instead.
Green sea turtles show up at many of these spots, and spinner dolphins rest along the leeward coast by day. Pick the shore that matches the season, check the surf report, and bring reef-safe sunscreen.
Tap a spot to see what it is like, then open its guide or get directions.
Tap a card for spotting tips and the Guardian rule for each animal. Filter by what you most want to meet.
The turtle you are most likely to meet. Greens graze on algae over shallow reef and rest under ledges. In Hawaii they are protected and very used to snorkelers.
Spotting tip: Scan the rocky edges where waves wash over algae, and sandy cleaning stations where fish pick at their shells.
Guardian rule: Stay at least 10 ft away. Never block a turtle's path to the surface.
Chelonia mydas
Slender dolphins famous for leaping and spinning. They rest in calm Hawaiian bays by day after feeding offshore at night, which is why the law protects their daytime rest.
Guardian rule: Federal law bans swimming with or approaching spinner dolphins within 50 yards in Hawaii.
Stenella longirostris
One of the most endangered seals on Earth, found only in Hawaii. Monk seals haul out on beaches to rest and sometimes swim past snorkelers near shore.
Guardian rule: Stay at least 50 ft away on land and in the water, and 150 ft from a mother and pup. Disturbing them is a federal offense.
Neomonachus schauinslandi
A bright lemon-yellow surgeonfish that grazes algae in loose schools. It is one of the easiest Hawaiian reef fish to spot, especially along the Kona coast.
Zebrasoma flavescens
A striking black, white and yellow fish with a long trailing fin, often seen in pairs or small groups over Pacific reefs.
Zanclus cornutus
Colorful grazers with fused, beak-like teeth. You can hear them crunch on coral rock, and much of the white sand on tropical beaches passes through them.
Scaridae
Hawaii's state fish, with a famously long Hawaiian name and bold, painted-on stripes. It patrols shallow, surgy reef and grunts when it is caught.
Rhinecanthus rectangulus
A pale surgeonfish with dark vertical bars, often moving across Hawaiian reefs in big grazing schools.
Acanthurus triostegus
Thousands of humpbacks winter in Hawaii to mate and calve, mostly from December to April. Snorkelers often hear their songs underwater, especially off Maui.
Spotting tip: Put your head underwater and listen. The song carries for miles.
Guardian rule: Stay at least 100 yards away. Boats must keep the same distance.
Megaptera novaeangliae
Full guideTurtles and hundreds of fish fill the shallow inner reef of this protected volcanic crater bay. Reservations required, closed Mon and Tue.
Full guideClear summer water, tide pools and reef fish fill this lava-rock cove in the Pupukea marine reserve. Unsafe in winter surf.
Full guideA marine reserve fronts Queen's Surf and the Waikiki Aquarium, plus easy Kaimana Beach. Calm days only, and boats run to Turtle Canyon.
Full guideWarm water from the Kahe power plant outflow draws turtles, tang schools and sometimes dolphins, well offshore. Strong swimmers only.
Full guideFour sheltered, man-made lagoons on the leeward coast, with easy entry and calm water. The best fish are near the rocks. No lifeguards.
Sand entry, turtles and calm water, even when other North Shore spots close in winter. This cove at Turtle Bay Resort is sheltered by reef.
Free public beach access. Small free public lot off Kuilima Drive fills on weekends; resort parking is paid. Directions
Flat-topped reef formations with channels and small caves lie about 200 yards south of Sharks Cove. Summer only, and extremely dangerous Oct to Apr.
Free. Shares the small lot with Sharks Cove; weekend parking fills by 9 a.m. Directions
A breakwater shelters this Waianae coast bay, so it stays calm in winter. Easy for beginners, with fish and turtles near the breakwater.
Free parking at the beach. Arrive before 10 a.m. on weekends. Directions
Boat-only reef where green sea turtles gather. Tours sail 10 to 15 minutes from the Ala Wai area and give 30 to 45 minutes in the water.
No entry fee, but you need a boat tour. The Pink Sails listing was about $80 for two travelers when checked; see the tours on the Oahu page. Directions
A big North Shore bay calm enough to swim and snorkel in summer. In winter, huge surf and a dangerous shore break mean you stay out.
Free beach access. The main lot across from Waimea Valley fills early on weekends and in big swell; confirm any parking charge on arrival. Bring your own gear, there is no rental on site. Directions
Kayak about a mile from Lanikai or Kailua to the Mokulua islets, a state seabird sanctuary. Land only on Moku Nui, below the high-water mark.
Lanikai Beach is free. Kayak rentals are extra. Commercial landings on the islets need a state permit. Directions
Beach at low tide, shallow snorkeling at high tide: this Kaneohe Bay sandbar is reached by boat or kayak from Heeia, usually on a tour.
No entry fee, but you need a boat or kayak. One charter listed about $183 per person for 2 hours 45 minutes; confirm current price with the operator. Directions
Shore entries with easy parking and calm water on a normal day. Still check the surf and ask the lifeguard.
Turtles and hundreds of fish fill the shallow inner reef of this protected volcanic crater bay. Reservations required, closed Mon and Tue.
Clear summer water, tide pools and reef fish fill this lava-rock cove in the Pupukea marine reserve. Unsafe in winter surf.
Four sheltered, man-made lagoons on the leeward coast, with easy entry and calm water. The best fish are near the rocks. No lifeguards.
Sand entry, turtles and calm water, even when other North Shore spots close in winter. This cove at Turtle Bay Resort is sheltered by reef.
A breakwater shelters this Waianae coast bay, so it stays calm in winter. Easy for beginners, with fish and turtles near the breakwater.
Calm Choppy Rough. Wave heights are offshore model values.
Loading tides…
Forecast: Open-Meteo. Tides: NOAA station 1612340. Model data, not a lifeguard report. Always check posted warnings.
by Pink Sails Waikiki
Catamaran trip to Turtle Canyon with 30 to 45 minutes in the water, a guide and snorkel gear included. Minimum age 7 and basic swimming skill required.
The listing recommends reef-safe sunscreen. It does not state turtle distance rules, so ask the crew for the 10 ft briefing. Price is an estimate for two travelers.
by Living Ocean Tours
Two hour boat trip along the Honolulu coast to the Turtle Canyons site with in-water guides and snorkel gear. Operator says it sees green sea turtles on most trips.
Ask the crew for a turtle distance briefing (10 ft) before you get in. Group size not confirmed.
by Island Splash Tours
Short boat ride from Waikiki to an offshore area where green sea turtles feed, with gear provided.
Check the listing for group size and the operator's sunscreen policy before you book.
by See Viator listing
Full day minibus loop around the island with a North Shore snorkel stop to look for green sea turtles. Round trip hotel pickup in Waikiki.
Listing describes a small group of about 24 to 28 or fewer. Confirm the snorkel stop and season on the listing.
by See Viator listing
Guided Hanauma Bay visit with round trip transport from Waikiki, useful if you cannot get a bay reservation or do not want to drive and park.
Hanauma Bay's mandatory 9 minute education video still applies. Confirm on the listing whether bay admission is included.
We may earn a commission when you book through these links, at no extra cost to you. It never changes which tours we pick. How we choose tours.
May to September is the easy window island-wide because the North Shore is calm and the water is warmest. Winter still works on the south and west coasts, but skip the North Shore from about October to April.
Go in the morning. Winds and crowds build by midday, and Hanauma Bay's earliest reservation slots have the calmest water.
North Shore spots such as Sharks Cove and Three Tables during winter swells, and any beach after heavy rain.
| Row | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Snorkel conditions | Good | Good | Good | Good | Best | Best | Best | Best | Best | Best | Good | Good |
| Humpback whale | Best | Best | Best | Good | Avoid | Avoid | Avoid | Avoid | Avoid | Avoid | Fair | Best |
| Water °F | 78 | 77 | 77 | 78 | 79 | 80 | 81 | 81 | 82 | 82 | 80 | 79 |
North Shore snorkeling is a summer sport. From about May to September, Sharks Cove inside the Pupukea marine reserve is calm enough for confident swimmers, and Three Tables sits right next door. From about October to April, swells of 10 ft or more make both unsafe. There are no lifeguards at either spot, so go with a buddy and check the surf report first.
Green sea turtles are the headline animal. People see them from boats at Waikiki's Turtle Canyon, grazing near the Kuilima Cove rocks and at Electric Beach. Treat every sighting as a lucky one: stay 10 ft back, never touch or chase, and let the turtle choose where to go. Waikiki Turtle Canyon boat trips are the most reliable way to see them.
Hanauma Bay rents a mask, snorkel and fins on site, listed at $25 per set on the bay's FAQ page, and also offers life vests. Other beaches rely on rental shops around Waikiki and the North Shore, or on your own gear. Prices change, so check with the shop before you go.
Oahu has some of the strictest reef and wildlife protections in the islands, and several beaches are marine reserves where you cannot take anything out of the water.
Hawaii's Act 104 bans the sale of sunscreens with oxybenzone or octinoxate. You can still pack your own, but choose a mineral sunscreen with zinc oxide or titanium dioxide, or wear a rash guard, so less washes onto the reef. Official rule
Stay at least 10 ft from sea turtles and at least 50 ft from Hawaiian monk seals, on land and in the water. Never touch, chase or block them. Official rule
Federal law bars swimming with or approaching spinner dolphins within 50 yards, and approaching humpback whales within 100 yards. Official rule
Hanauma Bay is a nature preserve, and Sharks Cove and Waikiki sit in marine life conservation districts. Do not stand on coral, feed fish or collect shells, rocks or sand. Official rule
How snorkelers protect reefs · Hawaii reef-safe sunscreen rules
These local groups restore coral, rescue wildlife and keep the water clean. Volunteer a morning, donate, or just follow their work.
Community stewardship of the Pupukea-Waimea Marine Life Conservation District
A community group on the North Shore that works to protect the Pupukea-Waimea MLCD, which covers Sharks Cove and Three Tables. Check their site for education programs and volunteer days.
Visit pupukeawaimea.org →For first timers, Hanauma Bay is the most protected reef, with calm shallow water and lifeguards, but it needs a reservation and is closed Monday and Tuesday. Sharks Cove is the pick on the North Shore in summer, and Electric Beach suits strong swimmers on the west side.
Only at Hanauma Bay, where non-residents need an online reservation that opens 2 days ahead at 7:00 a.m. Hawaii time. Other beaches such as Sharks Cove, Waikiki and Ko Olina do not require a reservation.
Boat tours from Waikiki visit Turtle Canyon, and wild turtles also turn up at Hanauma Bay, Electric Beach and North Shore reefs. Keep at least 10 ft away and never touch them.
No. Sharks Cove and nearby spots see swells of 10 to 30 ft or more from about October to April and have no lifeguards. Go to the south shore or leeward coast in winter and wait until summer for the North Shore.
May to September has the calmest North Shore and warmest water, around 80 to 82 F. Winter is fine on the south and west coasts, with water near 77 to 79 F.
Choose a mineral sunscreen with zinc oxide or titanium dioxide. Hawaii bans selling sunscreen with oxybenzone or octinoxate, and a rash guard cuts the amount you need even more.
What we pack for every snorkel trip. Each link searches the category on Amazon so you can compare brands and prices.
Non-nano zinc oxide only. No oxybenzone or octinoxate, which Hawaii bans.
Shop on Amazon →The best sun protection is fabric. Less sunscreen in the water, less sunburn on your back.
Shop on Amazon →A low-volume mask that fits beats any rental. Short travel fins pack easily.
Shop on Amazon →An inflatable vest lets you rest without standing on the reef. Lifeguards love them.
Shop on Amazon →As an Amazon Associate we earn from qualifying purchases. Disclosure.
Spinner dolphins pass the lava-ledge coves, and after dark giant manta rays swoop through your lights on a night snorkel. A bay with a monument can be…
Swim a horseshoe reef on the north shore, a turtle-filled tombolo on the south, and a coast of sea cliffs you can only snorkel from a boat. Kauai…
Reach a sunken volcanic crater by boat, watch green sea turtles graze in knee-deep water on the south shore, and walk into calm west-side bays…
We check fees, rules and access against official sources first, then local operators and recent visitor reports. Conditions change, so always follow posted signs and lifeguards. Spotted something out of date? Tell us.
