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Best fit: November to April
These months generally offer better beach weather, calmer sea conditions and less frequent rain, making them the strongest for the Four Islands and Phi Phi excursions.
Also possible: May and October
Both are shoulder months. The trip is workable, but showers and changing sea conditions may affect boat tours or water activities.
Avoid / least suitable: June to September
These are wetter monsoon months on the Andaman coast. Rough seas, rain and reduced visibility can affect island hopping and water activities, even if Phuket and Krabi themselves remain open. Maya Bay also has an annual conservation closure; in 2026 it is closed from 1 August to 30 September.