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Koh Samui Weather & Climate

Current Condition, Weather Forecast, Statistics and Historical Data

Koh Samui's monsoon season starts in October with the north-east monsoon carrying moisture from the Philippines and Indonesia. The south-west monsoon from India, which mainly affects Phuket and the Andaman coast is rarely felt on Koh Samui, as a massive mountain range on the mainland shields Thailand's eastern shore.

Koh Samui has three seasons. February to May is the hot and dry season with peak daytime temperatures exceeding 40 degrees Celsius and little rain, except for short, but heavy cloudbursts.
Typical weather from June to September brings more tropical rain showers, a short and welcome breather from the heat of the day. Daytime temperatures are still in the high thirties. The beaches are wide and bright, the sea is generally calm and smooth.
Koh Samui's monsoon season starts in October with torrential rain falls, flooding, mud slides, strong wind and waves from the east. This nasty weather is caused by the north-east monsoon coming up from the Philippines and Indonesia. Also November can be rather wet. Temperatures drop to twenty degrees at night - which is quite cold by local standards. The heavy rain and flooding usually comes to an end in early December. The wind still blows from the east, driving high surf into the beaches of Chaweng and Lamai. Fortunately the hotel and resort areas in the bays of Maenam, Lipa Noi and Taling Ngam are somewhat sheltered from the strong waves The beaches here offer superior conditions for swimming and beach safety until windy conditions settle down by the end of January.

Historical Temperature maxima & minima on Ko Samui for the year

Water temperature in the sea & precipitation

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