Diving Thailand in February: Best Sites & Conditions

Featured image: oliver.dodd, CC BY 2.0, via Flickr.

Diving Thailand in February: The Short Answer

February falls in the middle of the Andaman dive season. Seas are generally calm, and the Similan and Surin parks are reported to be open from mid-October to mid-May. Our pick is a liveaboard from Khao Lak that also reaches Koh Bon, Koh Tachai and Richelieu Rock. Short on time? Base yourself in Koh Lanta for day trips to Hin Daeng and Hin Muang. New to diving? Koh Tao puts you on a dive site in 30 minutes or less. For the full-year picture, read our year-round dive calendar.

February Conditions at a Glance

Use this table to match February to your plan. Conditions stay qualitative because trustworthy February-specific visibility and temperature figures are thin. Treat each row as a prompt for questions to your operator.

Andaman Sea vs Gulf of Thailand in February

Start with the Andaman. The west coast is where February diving peaks, with the Similan and Surin parks open for the season. Older local accounts call February and March calm, hot and clear. Visibility can fade gradually later in the season as plankton increases, and that plankton can also draw larger visitors. Next, the Gulf. Koh Tao is diveable year-round, and its sites sit about 30 minutes or less from shore. Rougher Gulf weather is reported around October and November, so February sits past that stretch. Still, do not treat the Gulf as an automatic budget fallback. Our rule is simple: choose the Andaman for big-animal chances and Koh Tao for learning.

Best Dive Areas in February

Pick by experience level and days available. Each area below carries a different access cost.

• Similan and Surin Islands: best for liveaboard divers. Boats leave from Thap Lamu Pier near Khao Lak. Trade-off: the islands are remote, so plan on about 4 days.
• Richelieu Rock: a whale shark hotspot that many northern Andaman liveaboards include. Trade-off: it is offshore, so a day trip is impractical.
• Koh Bon and Koh Tachai: Koh Bon holds a manta cleaning station. Both are usually bundled into Similan liveaboard routes.
• Hin Daeng, Hin Muang and Koh Haa: best for experienced divers. Day trips run from Koh Lanta, and less often from Phuket and Phi Phi. Koh Haa is a group of 5 large rocks forming a natural lagoon. Trade-off: currents can be strong.
• Phuket and Phi Phi day sites: Shark Point, King Cruiser Wreck and Anemone Reef suit shorter trips. Trade-off: less remote, and a lower chance of pelagics.
• Koh Tao: best for learners. Chumphon Pinnacle offers shark encounters. Trade-off: no mantas here, and whale sharks are a lucky bonus.

Liveaboard or Day Trip? Time, Cost and Access Trade-offs

Similan liveaboards typically run 4 days because the islands are remote. Trips of 3 to 10 nights exist across Thailand's fleet. The alternative is a 2-hour speedboat ride each way on a day boat. We would pick a liveaboard if you can spare the 4 days, since a day trip spends a large share of the day in transit. Day boats suit Hin Daeng and Hin Muang from Koh Lanta better. Costs are relative: ask several operators for current quotes and compare what each includes.

What You Might See in February

Marine life is a chance, not a promise. Mantas use the cleaning stations at Koh Bon and at Hin Daeng and Hin Muang. Whale sharks are associated with Richelieu Rock, and Koh Tao sees them only rarely. Leopard sharks turn up around Phuket and Phi Phi sites. Macro fans can look for seahorses, ghost pipefish and frogfish. Koh Tao has no mantas, though Chumphon Pinnacle gives shark encounters. Ask your guide what has been seen in the past week rather than relying on seasonal averages.

Plan Your Trip: Booking, Getting There, Where to Base

Most Similan liveaboards leave from Thap Lamu Pier, a busy fishing port near Khao Lak. February sits between shoulder and high season, so book liveaboards early. Lead times vary by boat. Park opening dates and fees come from the national parks department. Before paying, ask five things. Is your certification and insurance cover checked? Are park fees included? Is equipment included? What is the dive-group size? What are the cancellation terms?

• Khao Lak: best base for Similan and Surin liveaboards from Thap Lamu Pier.
• Phuket: day sites around Phi Phi, with occasional Hin Daeng trips.
• Koh Lanta: the strongest base for Hin Daeng, Hin Muang and Koh Haa day trips.
• Koh Tao: short transfers, courses and year-round diving in the Gulf.

What to Pack

A 3 mm wetsuit is the common recommendation for Thai waters. Some divers wear only a rash vest. For temperatures behind that choice, read our water temperature guide. Add a dive torch for night dives and reef-safe sunscreen. Bring seasickness tablets too, especially for the 2-hour day-boat run or a liveaboard.

• 3 mm wetsuit or rash vest
• Dive torch
• Reef-safe sunscreen
• Seasickness tablets
• Certification card and insurance details

Mistakes to Avoid in February

These errors are the ones that cost divers the most time. Each is easy to avoid with a few questions before you book.

• Booking a Similan day trip and expecting a liveaboard-quality experience.
• Assuming Gulf and Andaman conditions match.
• Leaving liveaboard bookings late in a busy season.
• Ignoring park open and close dates.
• Expecting guaranteed manta or whale shark sightings.

February vs the Neighboring Months

January sits earlier in the same season, so see our January diving notes. March brings the plankton shift that older local accounts mention, so read our March diving guide. For the start of the Andaman season, our November notes cover opening timing. Parks close around mid-May, so April diving sits near the end of the window.