Koh Samui Weather
Rainy season and climate
rainshower in Chaweng
During the high season, from December to February, temperatures
on Koh Samui can reach up to 30?C (86?F). Brief tropical rainshowers
occur mostly in December. This is the best season for European people
as the weather is comparatively cooler than the rest of the year.
From March to June it becomes very hot -- up to 40?C (114F), with
little or no rain. You will appreciate your air-conditioned accommodation
during this time!
The months of July to September are hot with occasional rain. These
are also popular months for visitors.
October and November see more rain than other months, though it
generally doesn't rain every day. In contrast to other regions of
Thailand, Samui does not really have a well-defined rainy season
but sometimes there are sunless periods for two or three days, especially
during the monsoon month of November. The weather is quite difficult
to predict during this time, but being Samui, you're virtually assured
of getting some great sunshine!