Koh Samui Monthly Climate Averages
To help you choose the best time to travel, you can find climate data below on the weather on Koh Samui .
High season with the best weather conditions for the beach leisure on Koh Samui are typically January, February.
Temperature on Koh Samui
The table shows that the hottest months on Koh Samui are May and June, during which the average daytime temperature reaches +32.6°C and the nighttime temperature falls to +25.7°C.
The coldest months are January and December, when the daily average temperature falls to +29°C, and drops to +24.2°C during the night.
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The month with the highest average monthly temperature in the Gulf of Thailand on the beaches of Koh Samui is April with 29 degrees.
The coldest water can be found in January — 27degrees C.
The largest amount of precipitation falls on average in November and October, up to 507mm, and the least in February and March — up to 54mm.