May marks the transition from Koh Samui’s hot, dry season to its wetter period. Typically, daytime temperatures remain high, often exceeding 30C (86F), with high humidity. While sunshine is still common, expect an increase in rainfall compared to the preceding months. This can range from short, heavy showers to more prolonged periods of rain. Sea conditions are generally calm, though occasional storms can occur.
Understanding Koh Samui’s climatic conditions during May is vital for travelers planning a visit. Packing appropriately with light, breathable clothing and rain gear is essential. The shift in weather patterns can influence outdoor activities, making it advisable to have flexible itineraries. Historically, May represents the shoulder season, offering a potential balance between pleasant weather and fewer crowds compared to peak season. This period can offer competitive prices on accommodations and tours.