It is hard to choose between these two tropical paradise islands in Thailand, whether the next destination should be Koh Samui or Phuket. Regardless of the traveler’s’ preferences, the timing and season of the visit are also one of the most important things one has to consider.

Although Koh Samui and Phuket have shared a similar status of a prominent beach destination as well as the southern location of Thailand, these two islands are situated in the different seas. While Phuket sits majestically in the Andaman Sea, Koh Samui is hidden in the Gulf of Thailand in Surat Thani Province, causing the distinction in the season.

This difference presents an excellent opportunity for travelers to avoid bad weather in one destination by switching to another place.

When is the best time to travel to Koh Samui?

Koh Samui is a year-round travel destination as the weather there is not severe even during the monsoon period. The island only faces some unpleasant weather approximately five years per time which the last big monsoon storm hit Koh Samui was in 2010 causing floods and some difficulties to travel by ferry.

Samui has three distinct seasons; they are; Dry, Hot and Rainy seasons. Ones can travel to the island all year round if they do not mind a rain shower. The best time to visit the island is during the dry season from mid-December to June as the heat, and the humidity level are not too high. However, during mid of January to February are considered the peak season of Koh Samui. Visitors might want to avoid this time as the island tends to be crowded with tourists, and the accommodation rates are skyrocketing.

June probably the best month to visit Koh Samui as the weather tends to cool down with sprinkle rain, low number of tourists, making the accommodation price goes down.

When to avoid?

Again, if one does not mind a little rain in Koh Samui, there is no need to worry about when is the best time to visit the island. Although if the sunshine and outdoor activities are one’s the priority, try to avoid mid of October toward the first half of December as this period is the wettest season on the island. The rainy season in Samui starts in September, the rain will bring moist and cool breeze to the island, making it a good time to stay lazily on the island.

For those who look for sunbathing, water sports activities and all-day outdoor activities without any raindrop to bother, visit the island during the hot season that falls from March to May. During this time, the island is filled with heat and scorching sunlight, one might have to be careful with the sunburn and dehydration.

What to do during the rainy day on Koh Samui?

Koh Samui’s sea is much calmer than Phuket one, making the place is perfect for diving and sailing. Diving in Samui can be enjoyed almost all year round as the Gulf of Thailand acts like a large shelter for all the divers. However, during the monsoon season the visibility might drop drastically and is not suitable for diving. For sailing, the big event, the Samui Regatta is set to come back every May which is also the best time for sailing.

The easiest way to enjoy Koh Samui on the rainy day is to relax and spend time reading one’s favorite book or soaking in a private hot tub. Otherwise, a pampering day in a spa is also an ideal way to pass the day.


  • Best time to visit the Ang Thong Marine Park is during February to April.
  • Songkran Days, a nationwide festival, take place every 13-15 April of each year.
  • Samui Regatta takes place every May
  • Diving can be done from February to October with the best visibility to see marine creatures around March to April.