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Koh Samui Weather

Need to know more about Koh Samui weather to accurately decide when is the best time to go? The tropical climate sees warm weather 12 months of the year, but when you should book your accommodation will depend on personal taste with some liking it hot and dry, some cooler and some the relief occasional showers bring.

The average maximum temperature measured over 12 months of the year is around 30 degrees Celsius. If you want to go when it is really hot with maximum temperatures averaging between 30 to 35 degrees Celsius, March to August will be perfect. Few showers are experienced during this time with minimum temperatures averaging 25 degrees Celsius later in the evening.

The weather here is influenced mainly by the north Eastern monsoon, blowing in from China and Vietnam. The dry season arrives in December and remain so until February. Average maximum temperatures during these months reach a steady 32 degrees Celsius and the average minimum around 24 degrees.

The rainy season brought about by the monsoons starts September and persist until November still seeing maximum temperatures reach 30 degrees. The average rainfall per month for this period is approximately 250 mm with November seeing the highest rainfall with around 300 mm. This does not mean rain days on end though. With the tropical climate, showers are experienced two to three times per day, lasting for an hour with lost of daytime sunshine to be enjoyed.

March to May see very little rain and temperatures soar to 40 degrees Celsius. The weather June to end August is excellent with a few showers cooling the air. Average temperatures of approximately 28 to 30 degrees Celsius are experienced during this time.