Unfortunately visitors are sometimes incorrectly informed about Koh Samui weather seasons prior to their departure. Not everyone is aware for example, that we do not have the same rainy season as Phuket does. This is because Koh Samui island is situated on the Gulf coast and faces east, so it feels the effect of the Northeast monsoon.

January - February is the cool season on Samui island, temperatures average a pleasant 79°F / 26°C. This is generally the best time to visit as it is not too hot.

March - May is the hot season, the temperature starts warming up, it has been known to reach 40°C There is generally less rain on Koh Samui during these months.

June - September generally speaking, between these months, most days will be filled with sun, except for the occasional downpour, which usually doesn't last long.

October - December frequent showers (not monsoons) come in October, and last until sometime around mid December, when the Samui weather generally clears up with extended periods of dry and often sunny weather. Water sports enthusiasts should note that the sea can get rough at this time, and visibility can be affected.