Introduction to Similan Islands

South East Asian coral bleaching of 2010 has had a dramatic effect on Thailand’s dive sites in general leaving some areas in a depressing and sad state. Unfortunately, few Similan dive sites escaped the bleaching unscathed. Unregulated and unsustainable commercial fishing is also taking its toll on the Andaman Sea area as a whole and there are clear signs of a dramatic fall in shark and manta ray sightings.

Nevertheless, you will be hard pressed to find better diving on offer in Thailand especially if you include the more remote and lesser known dive sites, Koh Bon, Koh Tachai and the world renowned Richelieu Rock which most Similan liveaboards include on their itinerary. Given the diversity and convenience of such wonderful dive sites it is little wonder that the Similan Islands continue to be a popular choice for discerning divers, many of whom return year after year.

A few liveaboards also include Hin Daeng & Hin Muang in their itinerary. The underwater pinnacles of Hin Daeng and Hin Muang are the very best of what the Southern Andaman Seas has to offer. They are covered in Hemphric’s soft coral, resulting in an explosion of colours that are the namesake of these two dive sites. Hin Daeng and Hin Muang have great marine biodiversity, corals, and formations below the water. The cleaning stations attract large pelagics at any time of the year. At Koh Haa & Phi Phi you will find stunning limestone cliffs, cathedrals, chimneys and more just waiting to be explored.

Diving Season

October to May is the high season in the Similan Islands. The most constant weather patterns and stable conditions tend to be between November and April.

Best Time to Dive Similans

Best Dive Season October to May
Temperature 28-34C
Water Temperature 28-30C

Heavy rainfall during the eastern monsoons and wet monsoon from May to August.

Liveaboard In Similans