The best time to visit Thailand is during the dry season, from November to March, when the weather is sunny, warm, and ideal for both sightseeing and beach vacations.
For sun and sea on the Andaman Coast (Phuket, Krabi, Koh Lanta), December to March is perfect. For the Gulf Coast (Koh Samui, Koh Phangan, Koh Tao), the most reliable weather is from January to August.

