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Similan Islands Opening Season and Best Time to Visit

Similan Islands Open Season

MonthHoursFrequencyNotes

Oct 15- May 15

9:00am-5:30pm

Daily speedboat & catamaran tours

The national park is open for visits and tours

May 16 -Oct 14

-

Closed

Islands closed for monsoon season & coral restoration

Timing notes & visitor warnings

  • Boats to the Similan Islands operate only during the open season (Oct–May).
  • Bad weather or rough seas can lead to same-day cancellations. Always reconfirm the night before.
  • The last boats leave the islands around 3:30-4:00pm to return to Phuket or Khao Lak.
  • No overnight stays are currently allowed on the islands.
  • Bring sunscreen, dry bags, and motion-sickness medication for rough crossings.

Best time to go on a Similan Islands tour

Two people swimming in clear blue water near rocky shore, Similan Islands tour.

Peak season (November to April): This is the best time to visit the Similan Islands. The Similan Islands' weather is characterized by clear skies, calm seas, and excellent visibility for snorkeling and diving. It’s also the busiest period, with most**** Similan Islands day trips and Similan Islands tours from Phuket or Khao Lak operating daily. Expect slightly higher prices and limited slots, so early Similan Islands booking is recommended.

Low season (May to mid-October):The islands are closed to visitors during the monsoon season for reef conservation and safety. Heavy rains and rough seas make access impossible, and all Similan islands tours are temporarily suspended.

Shoulder months (October & May): The park may open or close depending on sea conditions. If open, these months offer fewer crowds and still-enjoyable weather, ideal for a quieter Similan day trip experience.

Speedboat at Similan Islands beach with tourists, Love Andaman tour.

Weekdays: Generally more relaxed and less crowded, especially for Similan day trips from Khao Lak. You’ll enjoy peaceful beaches, easier photo opportunities, and more time at each snorkeling spot.

Weekends: Expect more visitors and fully booked tours, especially during November to April. While the energy is lively, it’s best to book your Similan Islands tour from Phuket or Khao Lak in advance to secure spots on speedboats or catamarans.

How long does a Similan Islands tour last?

Speedboat near Similan Islands with snorkelers in clear blue water, surrounded by rocky shoreline.

A typical Similan Islands tour lasts between 8 to 13 hours, depending on your departure point and itinerary.

  • From Khao Lak: Expect around 8–9 hours total, with a shorter boat transfer and more time at the islands.
  • From Phuket: Tours can last up to 10-13 hours, including travel to Thap Lamu Pier and the speedboat or catamaran journey.

FAQs

No, they’re open from October 15 to May 15 and closed during the monsoon for conservation.