Similan Islands: season, access and what a day trip covers
The Similans close for part of the year. What the season means for your dates, how tours reach the islands, and what to expect from the crossing.
The Similan Islands are a national park that closes annually, usually from mid-May to mid-October. If you are travelling in that window, no operator can sell you a day trip — anyone who says otherwise is selling you something else.
In season, the islands are reached by speedboat from the Phuket and Khao Lak side. It is a long crossing and the water is the point: visibility here is the best in Thailand.
Season and access
Similan Islands Snorkeling Day Tour from Phuket
Facts read from the operator’s product record. Price is checked against Viator for your dates and party size — it is not a fixed quote. We may earn a commission if you book through it; you pay the same either way.
Questions
Can I stay on the islands?
Park accommodation exists on some islands but is limited and books out. Most visitors do it as a day trip.
Is it good for beginners?
Yes — the snorkelling is from the boat and the water is calm in season. Divers go for the deeper sites.
Written for travellers booking Thailand independently. Facts about specific tours come from the operator’s product record; practical advice is ours and marked as such. Prices and availability are checked on Viator, not guaranteed by us.