In Thailand you have several regions, one of which is called Koh Samui. The most popular city in this region is Chaweng Beach, whose climate data we'll examine to provide you with an overview of what weather to expect in Koh Samui. For more detailed climate information about other cities in the area, please see the section beneath the map further down the page.
High temperatures are a constant in Koh Samui, especially in Chaweng Beach, with average maximums staying above 28°C (82°F) all year long.
Koh Samui reaches its peak temperature in May, hitting 31°C (88°F), while January brings cooler conditions with daytime highs of 28°C (82°F).
April, May and June are generally the hottest months of the year.
When it comes to rainfall, Koh Samui sees significant variations throughout the year. October tends to be the wettest, receiving 301 mm (12 in) of rain, while February is much drier with just 44 mm (1.7 in). Travelers should note that the rainy season falls during October and November, bringing substantial precipitation ranging from 294 mm (12 in) to 301 mm (12 in) monthly.
For those seeking sunshine, March usually has the brightest skies, making it an excellent time for exploring the region.
