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8
May–October tours run but captains cancel when Andaman seas are rough — build a buffer day. Morning outings usually clear; afternoon downpours common June–September. Fewer crowds, 20–30% lower prices. Railay, 4 Islands, Phi Phi still worth it with flexibility. Check rebook policy when paying. Dry bag for long-tail splashes even without rain. Worst swimming often September swells, not just rain.
2
Pack dry bag for long-tail — splashes even without rain.