Header Notice

Winter is here! Check out the winter wonderlands at these 5 amazing winter destinations in Montana

Scuba Diving The Similan Islands


by Sadie Eberhardt



Scuba diving in the Similan Islands is an unparalleled adventure that combines the thrill of exploring the underwater world with the stunning beauty of a tropical paradise. Located off the coast of Thailand in the Andaman Sea, the Similan Islands are renowned for their crystal-clear turquoise waters, vibrant coral reefs, and an abundance of marine life.


Whether you are a seasoned diver or a beginner looking to take your first plunge into the depths, the Similan Islands offer a diverse range of dive sites suitable for all experience levels. From shallow coral gardens teeming with colorful fish to dramatic underwater rock formations and deep blue walls, there is something for everyone to discover beneath the surface.


Getting to the Similan Islands is part of the adventure itself. The islands are only accessible by boat, and the journey from the mainland is an opportunity to soak in the stunning scenery and anticipate the underwater wonders that await you. Once you arrive, you will be greeted by a paradise of white sandy beaches fringed by lush greenery, providing the perfect backdrop for your diving escapades.


The underwater conditions in the Similan Islands are ideal for diving, with excellent visibility often exceeding 30 meters (100 feet), allowing you to fully immerse yourself in the vibrant underwater world. The waters are warm, averaging around 28°C (82°F), making it a comfortable environment for divers of all levels. The currents in the area can vary depending on the dive site, but most dives are suitable for beginner and intermediate divers.


One of the biggest draws of diving in the Similan Islands is the incredible marine life you will encounter. From majestic manta rays gliding gracefully through the water to elusive whale sharks, and from vibrant coral gardens bustling with colorful fish to enchanting sea turtles, there is no shortage of breathtaking marine encounters here. The Similan Islands are also home to several unique and endemic species, making it a dream destination for marine enthusiasts and underwater photographers.


Whether you prefer exhilarating drift dives, exploring intricate swim-throughs, or simply taking in the serene beauty of the underwater world, the Similan Islands have it all. In the next sections, we will explore the top dive sites, diving safety tips, and the best time to visit the Similan Islands to help you plan your unforgettable scuba diving adventure in this enchanting destination.


Getting to the Similan Islands

Reaching the Similan Islands is an adventure in itself, as they are located approximately 70 kilometers (43 miles) off the coast of Phang Nga Province in Southern Thailand. The closest departure point to the islands is the port town of Khao Lak, which is a 1.5 to 2-hour drive from Phuket International Airport.


Once you arrive in Khao Lak, you have several options for reaching the Similan Islands:

  1. Liveaboards: The most popular and convenient way to get to the Similan Islands is by joining a liveaboard diving trip. These multi-day excursions offer the opportunity to dive multiple sites, stay on board a comfortable boat, and explore the islands at your leisure. Liveaboard trips typically depart from Khao Lak and range from 2 to 7 days in duration.
  2. Day Trips: If you prefer a shorter visit to the Similan Islands, day trips are available from Khao Lak and Phuket. These trips depart early in the morning and return in the evening, allowing you to experience a few dives during the day. While day trips offer a taste of the Similan Islands, liveaboards provide the opportunity for a more immersive and in-depth diving experience.
  3. Private Charters: For a personalized and exclusive experience, you can charter a private boat to take you to the Similan Islands. This option is ideal for larger groups or those looking for a customized itinerary.

It’s important to note that the Similan Islands are part of a national park, and a park fee is required for entry. This fee helps support conservation efforts and the preservation of the islands’ natural beauty. Make sure to check the latest fees and regulations before your visit.


While the journey to the Similan Islands can involve some travel time, it is well worth it once you arrive at your destination. The scenic boat ride allows you to enjoy the breathtaking views of the Andaman Sea, and if you’re lucky, you might even spot dolphins or other marine life along the way.


As you plan your trip to the Similan Islands, consider booking your transportation and diving arrangements in advance, especially during peak seasons, to secure your spot and ensure a seamless and hassle-free experience.


Diving Conditions in the Similan Islands

The Similan Islands offer exceptional diving conditions that make it a sought-after destination for divers from around the world. The combination of warm waters, excellent visibility, and diverse underwater topography creates an ideal environment for both experienced divers and beginners.


The average water temperature in the Similan Islands ranges between 27°C to 30°C (80°F to 86°F) throughout the year, providing comfortable conditions for diving in a wetsuit or a rash guard. However, it’s worth noting that temperatures can vary slightly depending on the season and depth of the dive. During the cooler months from November to January, the water temperature may drop a few degrees, while during the warmer months from April to May, it may rise slightly.


Visibility is one of the highlights of diving in the Similan Islands, often exceeding 30 meters (100 feet) during the dry season from November to April. This exceptional visibility allows divers to fully appreciate the vibrant marine life and stunning coral formations that the region is known for. However, during the wet season from May to October, visibility can be slightly reduced due to plankton blooms, although it is still generally good for diving.


The Similan Islands are known for their diverse underwater topography, offering a range of diving experiences. From gentle sloping reefs and coral gardens to dramatic rock formations, swim-throughs, and deep drop-offs, there is something to cater to every diver’s preference. The variety of dive sites ensures that divers of all levels can find suitable spots to explore and enjoy.


The currents in the Similan Islands can vary depending on the specific dive site and the time of year. While some sites may have mild to moderate currents, others can experience stronger currents. It is important to be mindful of the current conditions and choose dive sites that match your experience and comfort level. Dive operators in the area have extensive knowledge of the local conditions and will guide you to the most suitable dive sites based on your skill level.


For those seeking an even more exhilarating diving experience, the Similan Islands offer fantastic opportunities for drift diving. The currents in certain areas can create thrilling drifts along breathtaking underwater landscapes, allowing divers to effortlessly glide along while taking in the stunning marine life and scenery.


Overall, the diving conditions in the Similan Islands are exceptional, with warm waters, excellent visibility, and diverse underwater topography. Whether you are a beginner or an experienced diver, the islands offer a range of dive sites to discover and enjoy the wonders of the underwater world.


Marine Life in the Similan Islands

The Similan Islands are renowned for their rich biodiversity and are home to an incredible array of marine life. Diving in these waters offers the opportunity to encounter species ranging from tiny colorful nudibranchs to majestic marine mammals.


One of the highlights of diving in the Similan Islands is the chance to see graceful manta rays gliding through the water. These magnificent creatures, with their wingspans reaching up to seven meters (23 feet), are a sight to behold. The islands are known for their manta cleaning stations, where these gentle giants visit to have parasites removed by cleaner fish. Snorkelers and divers alike can witness this fascinating behavior up close.


Another charismatic creature that attracts divers to the Similan Islands is the elusive whale shark. These gentle giants, which can grow up to 12 meters (39 feet) in length, visit the area occasionally, providing an unforgettable encounter for lucky divers. Swimming alongside a whale shark is truly a once-in-a-lifetime experience that should not be missed.


The Similan Islands are also known for their diverse range of coral species, creating vibrant and colorful coral gardens. Staghorn and table corals dominate the reefs, providing shelter and food for a multitude of marine organisms. You can expect to encounter an abundance of tropical fish, including angelfish, butterflyfish, parrotfish, and many more. Exploring the reefs is like entering a bustling underwater city filled with a kaleidoscope of colors.


Turtles are a common sight in the Similan Islands, and encounters with these gentle reptiles are frequent during dives. Green turtles and hawksbill turtles can often be seen gracefully swimming or resting on the coral reefs. Observing these creatures in their natural habitat is a true privilege.


Other marine species that can be found in the Similan Islands include barracudas, trevally, moray eels, octopuses, and a wide variety of nudibranchs. If you have a keen eye, you may even spot seahorses camouflaged among the seagrass or tiny pipefish hiding among the coral branches.


Diving in the Similan Islands is not limited to the open ocean; there are also fantastic opportunities for macro photography. Experienced underwater photographers can find an abundance of small critters such as colorful shrimps, crabs, and gobies hiding among the coral formations.


In summary, the Similan Islands offer an incredible diversity of marine life. From encounters with magnificent mantas and whale sharks to the vibrant coral reefs teeming with tropical fish and fascinating macro creatures, diving in the Similan Islands is a true underwater paradise for all nature enthusiasts.


Top Dive Sites in the Similan Islands

The Similan Islands are home to several world-class dive sites that offer breathtaking underwater scenery and diverse marine life. Here are some of the top dive sites that you should add to your diving itinerary:

  1. Elephant Head Rock: This iconic dive site is named after its resemblance to the head of an elephant. It features stunning underwater rock formations, swim-throughs, and an abundance of marine life. Divers can expect encounters with reef sharks, turtles, colorful corals, and plenty of fish species.
  2. Richelieu Rock: Considered one of the best dive sites in Thailand, Richelieu Rock is famous for its vibrant marine life. This pinnacle dive site is known for its encounters with whale sharks and manta rays. Divers can explore the stunning soft coral formations and look out for seahorses, pipefish, and other macro critters.
  3. Koh Bon: Located north of the Similan Islands, Koh Bon is a must-visit for divers seeking encounters with manta rays. This dive site is a cleaning station for mantas, attracting them in large numbers. Divers can witness these majestic creatures gliding gracefully through the water while getting cleaned by cleaner fish.
  4. Three Trees: A beautiful dive site known for its three submerged pinnacles covered in colorful soft corals and surrounded by schools of fish. Divers can explore the swim-throughs and enjoy sightings of reef sharks, barracudas, and other pelagic species.
  5. Christmas Point: Located near Donald Duck Bay, this dive site is named after the abundance of soft corals that resemble festive decorations. Divers can expect encounters with reef sharks, turtles, and a variety of fish species. The vibrant coral gardens make it an excellent spot for macro photography.

These are just a few of the many incredible dive sites in the Similan Islands. Each site offers its own unique charm and underwater experiences. Whether you are exploring underwater rock formations, swimming alongside graceful mantas, or getting up close with colorful corals and marine life, diving in the Similan Islands promises an unforgettable adventure.


Diving Safety Tips in the Similan Islands

While diving in the Similan Islands is a thrilling and memorable experience, it is important to prioritize safety. Here are some essential diving safety tips to ensure a safe and enjoyable underwater adventure:

  1. Choose a reputable dive operator: Select a dive operator with a good reputation and experienced dive instructors who prioritize safety. Look for certifications and check reviews from other divers.
  2. Check your dive equipment: Before each dive, carefully inspect your dive gear to ensure everything is in proper working order. Check your regulator, BCD, dive computer, and other equipment for any signs of damage or malfunction.
  3. Plan your dives and dive within your limits: Always plan your dives and discuss your dive plan with your dive buddy and divemaster. Dive within your level of training and experience, and never exceed your personal limits. Do not attempt dives beyond your certification level.
  4. Practice proper buoyancy control: Buoyancy control is essential for preserving the fragile marine environment and for your own safety. Practice good buoyancy skills, avoid touching or damaging the corals, and ensure you can maintain neutral buoyancy throughout the dive.
  5. Perform proper and regular equalization: Equalize your ears and sinuses regularly during descent. Do not force equalization and ascend to a shallower depth if you experience any difficulties. If you are unable to equalize, abort the dive and notify your dive buddy and divemaster.
  6. Monitor your air supply and dive time: Keep track of your air consumption and dive time. Follow the recommended dive profiles and safety stops to minimize the risk of decompression sickness. It is better to end the dive with more air than anticipated rather than pushing your limits.
  7. Respect the marine life and environment: Take care to maintain a safe distance from marine life and never harass or touch any marine creatures. Avoid contact with corals and reef formations to prevent damage to the fragile ecosystem.
  8. Stay hydrated and be mindful of your health: Hydrate properly before and after diving to prevent dehydration. If you are feeling unwell or have any medical conditions, consult with a doctor before diving and inform your dive operator of any relevant health concerns.
  9. Follow boat and dive briefing instructions: Pay attention to the boat and dive briefing provided by your dive operator. Familiarize yourself with emergency procedures, dive site information, entry and exit points, and any specific guidelines for the dive site.
  10. Practice dive buddy communication and safety checks: Always conduct a pre-dive safety check with your dive buddy to ensure all equipment is in order. Establish clear communication signals and maintain visual contact throughout the dive. Stay close to your buddy and be prepared to assist each other if needed.
  11. Listen to your body and dive within your comfort zone: If you feel fatigued, cold, or uncomfortable during the dive, communicate with your dive buddy and divemaster. It’s essential to dive within your comfort zone and prioritize your safety and well-being.

By following these diving safety tips, you can ensure a safe and enjoyable underwater experience in the Similan Islands. Always remember that safety should be your top priority, allowing you to fully immerse yourself in the wonders of the underwater world with peace of mind.


Best Time to Visit the Similan Islands

The Similan Islands are a year-round destination for diving, but the best time to visit depends on your preferences and priorities. Here is a breakdown of the different seasons in the Similan Islands:


Peak Season (November to April): This is the high season for diving in the Similan Islands. The weather is generally sunny, with calm seas and excellent visibility. During this period, you can expect water temperatures around 27°C to 30°C (80°F to 86°F) and visibility exceeding 30 meters (100 feet). The dry season also offers the best chance to encounter large marine species like manta rays and whale sharks.


Shoulder Season (May and October): May and October are transitional months between the high and low seasons. The Similan Islands see fewer visitors during this time, which means fewer crowds. Water temperatures may be slightly cooler, around 26°C to 28°C (79°F to 82°F). While visibility can be reduced due to plankton blooms, the diving conditions are still favorable, and you can enjoy sightings of various marine life.


Low Season (June to September): The low season in the Similan Islands coincides with the monsoon season, characterized by more frequent rain showers and rougher seas. However, this period can still offer fantastic diving opportunities. The seas are less crowded, and dive operators often offer discounted rates. Water temperatures range from 26°C to 29°C (79°F to 84°F), and although visibility may be reduced due to plankton, it creates excellent conditions for macro photography enthusiasts. Additionally, the abundant plankton attracts manta rays and whale sharks, providing unique encounters.


It’s important to note that the Similan Islands National Park is closed to visitors from mid-May to mid-October to allow the islands and marine life to recover and regenerate naturally. Therefore, diving trips are unavailable during this period.


Consider your preferences for weather, tourist crowds, and the marine life you wish to encounter when planning your visit to the Similan Islands. Regardless of the season, this stunning underwater paradise offers a wide variety of marine species and breathtaking dive sites that will make your diving experience unforgettable.


Choosing a Diving Operator in the Similan Islands

Choosing the right diving operator is crucial for a safe and enjoyable diving experience in the Similan Islands. With numerous operators to choose from, consider the following factors to help you make an informed decision:


Reputation and Experience: Look for dive operators with a good reputation and years of experience in the Similan Islands. Read reviews and testimonials from previous customers to get a sense of their professionalism, safety standards, and customer satisfaction.


Certifications and Licenses: Ensure that the dive operator holds the necessary certifications and licenses. Look for affiliations with reputable diving organizations such as PADI, SSI, or CMAS. This ensures that the operator follows internationally recognized safety standards and practices.


Instructor Qualifications: Check the qualifications and experience of the dive instructors. Ideally, the instructors should have extensive knowledge of the Similan Islands dive sites, marine life, and diving conditions. They should also be trained in emergency response and first aid.


Dive Group Sizes: Inquire about the maximum number of divers per dive group. Smaller group sizes allow for more personalized attention and better safety supervision, ensuring a more enjoyable diving experience.


Equipment Quality and Maintenance: Ask about the condition of the dive equipment provided by the operator. The equipment should be well-maintained, regularly inspected, and in good working order. This includes the regulator, BCD, dive computer, tanks, and other necessary gear.


Safety Measures: Find out about the safety measures implemented by the dive operator. They should conduct thorough dive briefings, provide safety equipment such as dive flags and SMBs (surface marker buoys), and have emergency procedures in place. They should also adhere to local regulations and guidelines set by the national park.


Pricing and Packages: Compare the pricing and packages offered by different dive operators. Consider the inclusions, such as the number of dives, equipment rental, meals, and accommodations for liveaboard trips. Ensure that the prices are transparent, with no hidden costs.


Additional Services: Some operators may offer additional services such as underwater photography or videography, Nitrox certification, or specialty courses. If you have specific preferences or interests, consider operators that provide these additional services.


Online Presence and Support: Look for dive operators with a user-friendly website, online booking options, and responsive customer support. This ensures a smooth and convenient booking process and makes it easier to communicate with the operator before your trip.


Take your time to research and compare different dive operators in the Similan Islands. By considering these factors, you can choose a reputable and reliable operator that will provide you with a safe, professional, and memorable diving experience in this stunning underwater paradise.



Scuba diving in the Similan Islands is a dream come true for adventure seekers and nature enthusiasts. With its stunning underwater landscapes, vibrant marine life, and pristine coral reefs, this tropical paradise offers a truly unforgettable diving experience.


Whether you’re a seasoned diver or just starting out, the Similan Islands cater to divers of all levels. From gentle coral gardens teeming with colorful fish to thrilling drift dives along mesmerizing rock formations, there’s something for everyone to discover beneath the surface.


The marine life in the Similan Islands is simply breathtaking. From encounters with majestic manta rays and elusive whale sharks to exploring vibrant coral gardens filled with tropical fish and captivating macro creatures, every dive holds the promise of awe-inspiring encounters.


When planning your trip to the Similan Islands, consider the best time to visit based on your preferences for weather and marine life sightings. Whether you choose the peak season for excellent visibility and encounters with large marine species, or the low season for discounted rates and unique encounters with plankton-feeding creatures, the Similan Islands offer incredible diving opportunities year-round.


Remember, safety should always be a top priority when diving in the Similan Islands. Choose a reputable dive operator, follow diving safety guidelines, and ensure your equipment is in good condition. By prioritizing safety, you can fully immerse yourself in the wonders of the underwater world while having peace of mind.


Are you ready to embark on your adventure in the Similan Islands? Dive into the crystal-clear waters, explore the vibrant reefs, and encounter some of the most captivating marine life on the planet. Get ready for an experience that will leave you with memories to last a lifetime.