Koh Samui, one of Thailand's most enchanting islands, is known for its pristine beaches, crystal-clear waters, and lush coconut groves. The climate is tropical and divided primarily into three seasons. The best time to visit Koh Samui is from late December to April. This period is considered the dry season when the island experiences the least rainfall, the skies are clear, and the sea is calm – ideal for outdoor activities such as swimming, snorkeling, and sunbathing. The weather is warm, with temperatures ranging between 25°C to 32°C (77°F to 90°F), making it perfect for enjoying the island's natural beauty without the interference of rain.
The peak tourist season aligns with the dry season, particularly around Christmas and New Year, when the island comes alive with festivities. Visitors planning to travel during this time should book accommodations well in advance to secure their preferred options. For those looking to avoid the crowds while still enjoying good weather, the months of May and June can be a good choice. Rainfall is slightly more frequent but often brief, allowing for cheaper rates and fewer tourists. Avoid the monsoon season, which typically runs from September to mid-December, as heavy rains can disrupt travel plans and water clarity for diving and snorkeling is significantly reduced.
| Month | Min Temp | Max Temp |
|---|---|---|
| January | 24°c | 29°c |
| February | 25°c | 29°c |
| March | 25°c | 30°c |
| April | 26°c | 32°c |
| May | 25°c | 32°c |
| June | 25°c | 32°c |
| July | 25°c | 32°c |
| August | 25°c | 32°c |
| September | 24°c | 31°c |
| October | 24°c | 30°c |
| November | 24°c | 29°c |
| December | 24°c | 29°c |