At any time of the year visitors will be satisfied with the weather in Samui and the coastal area. During the high season, from December to February, the weather temperatures on Samui hover at around 30 degrees centigrade. Short tropical downpours can still occur, mostly in December, but this is still considered the best season for European people to visit as the weather in Samui is cooler than later in the year. The seas at this time of the year a calm and generally clear, and the breezes are light.
From March to June the weather can get very hot indeed on Samui, up to 40 degrees centigrade, which is well over 100 degrees fahrenheit. There is little or no rain during these months, which can cause water shortages, and the pace of life slows right down to compensate for the heat. The sea remains calm and low tides can lead to very shallow waters on the island’s beaches. The wind picks up again in May, and this is a popular time for off-season visits. Late in the afternoon huge thunderstorms sometimes build offshore and come crashing into the island.
Beach season is all year round on Koh Samui
The weather on Samui during July to September is slightly cooler, with a mini monsoon season that brings occasional storms and periods of heavy rain. These are also popular months for visitors, who can still guarantee plenty of sunshine during their holiday.
October and November see more rain than other months, although even then it doesn't normally fall every day. Unlike many other parts of the country Koh Samui doesn’t have a prolonged or predictable rainy season. During the wettest periods there are rarely more for than two or three days without sun, even during November, which commonly considered to be the monsoon. However, the weather in Samui is quite difficult to predict during this time and the seas can be unusually rough.
No matter which season you decide to visit Koh Samui, as a westerner, one thing you will rarely feel is cold as Samui enjoys good tropical weather.
Facts on Koh Samui
Koh Samui for kids
Koh Samui Island history
Cost of living on Koh Samui