Land of Smiles — but not all months smile equally. Thailand's weather varies wildly between its two coasts and three seasons. Our guide cuts through the confusion.
Data based on Phuket (west coast). Note: Koh Samui (east coast) has an inverse wet season.
Thailand's cool season delivers what everyone comes for: sunshine, minimal rain, and warm but bearable temperatures. Phuket averages just 5–15 rain days from November to February, with the west coast beaches at their most pristine. February is the sweet spot — past the New Year crowds, before the heat ramps up, with a SunScore™ of 9.2.
March and April are transitional months — rain is still rare, but temperatures climb to 33–34°C with high humidity. Songkran (Thai New Year water festival) falls in April — a bucket-list event, but accommodation books out months ahead. Not ideal for beach-heavy trips but fantastic for cultural experiences.
The southwest monsoon hammers Phuket and Krabi from May to October. September is the worst (355mm!), with rough seas and beach closures. However, the east coast (Koh Samui, Koh Tao) stays relatively dry during this period — a smart alternative. Prices are at their lowest and temples are blissfully empty.