Nature ·
The Similan Islands are open again, from now until 15 May 2027
Mu Ko Similan National Park in Phang Nga reopened on 15 October 2026 after its yearly closure. The season runs to 15 May 2027, and boats leave from Thap Lamu on the Khao Lak coast.
Season dates from the Department of National Parks. Checked 29 October 2026.
The season
- Open: 15 October 2026 to 15 May 2027.
- Closed: mid May to mid October, for reef recovery and the southwest monsoon.
- Opening day: 1,409 visitors, 1,359 on day trips and 50 divers, per the park.
How a trip works
- Day trips: speedboats leave Thap Lamu pier, just south of Khao Lak, in the morning and return in the afternoon.
- Liveaboards: divers stay out for several nights to reach the outer sites, including Koh Bon and Koh Tachai.
- Life jackets: required for every boat passenger on the way out.
Reef rules
- Reef-safe sunscreen only: the park is checking and campaigning on this from day one.
- No single-use plastic: bring a refillable bottle.
- Stay off the coral: no standing, touching or feeding fish.
Timing tips
- Go early in the season: late October and November are quieter than December to February.
- Base in Khao Lak: it is the closest coast, about 1 to 1.5 hours by road from Phuket airport.