When Is the Best Time to Travel Thailand?

Thailand's weather varies by region, and Koh Samui follows a different pattern from much of the country. While Phuket, Krabi and the Andaman coast get most of their rain from May to October, Koh Samui and the Gulf islands stay mostly dry through the middle of the year and get their rain later, from October to December. Here's an overview of Koh Samui's seasons.

Dry Season (January to April):

• The driest and sunniest time of year, and the most popular time to visit. January can still bring windy days and choppy seas, but from February conditions are usually excellent. April is the hottest month. Expect higher prices and busier beaches, so book ahead.

Hot Season (May to September):

• Hot and mostly dry, with occasional short showers. The sea is usually calm, making this an excellent time for snorkelling, island hopping and boat trips. July and August are busy with summer holidays.

Rainy Season (October to December):

• Koh Samui's wettest months, with November usually the wettest of all. Rain often comes in heavy bursts with sunny spells in between. Some boat trips depend on the weather, and Ang Thong Marine Park usually closes for November. It is quieter and better value, and the weather usually improves through December, which gets busy again over Christmas and New Year.

The exact timing of the seasons can vary from year to year. If you want the best weather, January to April is ideal; for snorkelling and boat trips, February to September usually has the calmest seas; and if you are looking for value and fewer crowds, October to early December can work well if you are flexible.

For a month-by-month breakdown, read our guide to the best time to visit Koh Samui. Whenever you travel, we can help you explore: browse our private island tours.