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Koh Samui Weather

Koh Samui’s weather mainly features two seasons – sunny and rainy. The island’s typical sultry climate and year-round warm water is favorable for your next beach vacation. However, the best time to visit Koh Samui is without a doubt from the months of December through to June.

You can always visit Koh Samui during the off-season, however, there can be slight chances of heavy rain that may lead to possible torrential storms.

Koh Samui Weather 7 Day Temperature Forecast, Averages & Climate

The weather in Koh Samui can sometimes become unbearably hot; due to the island’s temperate climate, the humid percent is always high. The weather forecast averages around 26 degrees during December to February, however, if you go during March through June, the temperature can reach up to 46 degrees. Although there will be a plenty of sunshine, you may notice a little rain as well, even during this period.

The rainy season in Samui is mainly from October through November. During these wetter months, you’ll see considerable rainfall in Koh Samui, with storms and flooding on occasions. Even during the rainy season, the climate is hot and tropical; however, it is advisable to avoid the wet season if possible.



During the month of April, Koh Samui celebrates the Thai New Year of Songkran. On this day, you’ll see colorful parades and festivals on this island. In addition, the residents of Koh Samui also celebrate an array of music beach and local traditional festivals during these drier months.

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