Diving in Thailand in February

Conditions in February

So, you're dreaming of diving in Thailand this February? You've picked an absolute cracker of a month, my friend. February sits smack-dab in the middle of the prime dry season for the Andaman Sea, which is where all the real magic happens on the west coast. This means reliably glorious weather above the surface – think endless sunshine, clear skies, and a gentle breeze to keep things comfortable. You'll be spending your surface intervals soaking up some serious Vitamin D, probably with a refreshing drink in hand.

Below the waves, the conditions are equally superb. Water temperatures are consistently warm, hovering around a pleasant 28°C to 30°C (82°F to 86°F) across most of the dive sites. You'll be perfectly comfortable in a 3mm shorty or even just a rash guard for thermal protection, though a full 3mm wetsuit might be nice for multiple dives a day to prevent feeling chilly on those long deco stops. Visibility is usually outstanding, often reaching 20-30 meters, sometimes even pushing 40 meters on a truly spectacular day, especially around the Similan and Surin Islands.

Currents are typically mild to moderate in February, making it accessible for a wide range of diver experience levels. Of course, drift dives are common and part of the thrill, especially at some of the more exposed sites, but responsible dive operators will tailor their plans to the conditions and your group's abilities. You’ll find the sea state generally calm, offering smooth sailing on your liveaboard – perfect for those prone to seasickness, or simply for enjoying your journey between dive spots with a cup of coffee and a good book.

What you will see

February in Thailand is synonymous with one thing: pelagics, and plenty of them! This is prime season for manta rays, especially around sites like Koh Bon and Koh Tachai. You'll often see them gracefully cruising near cleaning stations, seemingly unbothered by divers, offering incredible close-up encounters. Whale shark sightings are also a real possibility during this time, particularly at the offshore pinnacles and the Similan and Surin Islands, though, as with all truly wild creatures, there are no guarantees. Keep your eyes peeled into the blue; you never know what giants might pass by.

Beyond the big stuff, the reefs are teeming with life. You'll be mesmerized by schools of vibrant fusiliers, snappers, and trevallies, often hunting in coordinated formations. Look for leopard sharks resting on the sandy bottom, particularly at sites like Hin Daeng and Hin Muang. Reef sharks, including blacktips and whitetips, are also a common sight. For those who enjoy the smaller wonders, Thailand’s reefs are a macro photographer's dream. Keep an eye out for ghost pipefish, seahorses, frogfish, nudibranchs in every imaginable color, and a plethora of tiny crabs and shrimps hiding amongst the corals.

The unique topography of the dive sites, with their granite boulders, swim-throughs, and dramatic walls, creates perfect habitats for this incredible diversity. You'll see flourishing hard and soft corals, anemone cities with resident clownfish, and a constant ballet of fish life. February also tends to be when many species are more active and visible, taking advantage of the stable conditions and abundant food supply, making it an incredibly rewarding time for marine life enthusiasts.

Top dive sites this month

Hands down, the crème de la crème for diving in Thailand in February are the Similan Islands, the Surin Islands, and arguably the crown jewels, Richelieu Rock. The Similans, a national park, offer dramatic granite formations, crystal-clear water, and a huge diversity of reef fish and invertebrates. Dive sites like Elephant Head Rock and Christmas Point are famous for their swim-throughs and large schools of fish.

Head a bit further north to the Surin Islands and you'll find Koh Bon and Koh Tachai, renowned for their manta ray cleaning stations, which are incredibly active in February. But the real superstar of the northern Andaman is Richelieu Rock – often cited as one of the best dive sites in the world. This isolated pinnacle is a magnet for pelagics, especially whale sharks and mantas, and is also an absolute macro paradise, boasting an incredible concentration of reef life from tiny seahorses to massive schools of barracuda. A trip in February without visiting these sites would be missing out big time.

Practical tips for your trip

As mentioned, a 3mm shorty or full wetsuit will be ideal for the warm waters, offering protection from the sun and any minor scrapes, as well as providing that bit of comfort for repeated dives. This month generally suits divers of all levels. Beginners will appreciate the calm conditions and excellent visibility, while advanced divers will revel in the drift dives and the chance for exhilarating pelagic encounters. However, some sites in the Similans and Surins can have stronger currents, so always dive within your comfort zone and listen to your dive guide.

Liveaboard availability in February can be competitive, as it’s peak season for a reason. Prices will be at their highest, and boats fill up fast, especially the more popular luxury liveaboards. Our advice? Book your trip as far in advance as possible, ideally 6-12 months out, to secure your preferred vessel and cabin. Don't forget reef-safe sunscreen, a good hat, insect repellent for evenings on deck or island excursions, and a reliable underwater camera – you’ll want to capture these memories! Remember that the Similan and Surin National Parks close annually from mid-May to mid-October, so February is truly one of the best times to experience them at their finest.