Similan Islands Set to Close for the Low Season 2025: What Travelers Need to Know
Planning a trip to Thailand’s breathtaking Similan Islands? Take note—the Similan Islands will officially close for the low season starting May 16, 2025, and are scheduled to reopen on October 15, 2025. This annual closure is a vital part of Thailand’s eco-tourism strategy to protect the islands’ delicate marine ecosystems.
Located in the Andaman Sea, the Similan Islands are world-famous for their crystal-clear waters, rich coral reefs, and vibrant marine life, making them a top destination for snorkeling and scuba diving enthusiasts. However, during the monsoon season (mid-May to mid-October), rough seas and unpredictable weather make travel dangerous and marine conservation more urgent.
Why do the Similan Islands close?
This seasonal closure allows the national park authorities to rehabilitate the environment, giving coral reefs and marine species time to recover from the high volume of tourists. It’s also a measure to ensure the safety of visitors, as sea conditions can become hazardous during this time of year.
Planning your visit
If you’re hoping to visit the Similan Islands, plan your trip during the open season—from mid-October to mid-May. Book tours in advance, as visitor numbers are limited to protect the park. Day trips and liveaboard diving tours are the most popular options.
Stay updated with official announcements from the Department of National Parks, Wildlife and Plant Conservation (DNP) to ensure your travel plans align with the reopening schedule.