Best Time to Visit Khao Lak

When to visit Khao Lak — the dry season for Similan Islands diving, as the park closes in the monsoon.

Khao Lak follows the Andaman climate, with one key note.

Dry season (Nov–Apr) — best

Calm seas and clear water; crucially, the Similan Islands national park is typically open only in these months, so this is when to come for diving.

Monsoon (May–Oct)

Quieter and cheaper, but rougher seas and the Similan park usually closes.

See also: the full Khao Lak travel guide.

Frequently asked questions

When is the best time to visit Khao Lak?

November to April — the dry season, and the only time the Similan Islands are usually open for diving.

Are the Similan Islands open all year?

No — the national park typically closes during the May–October monsoon, so plan diving for the dry season.