Traveling Thailand and looking for the best places to stay during the best time of year? For tourism purposes the weather in Koh Samet can be divided in 2 seasons, namely hot and dry season and the rainy season. You can expect average temperatures of 30 degrees Celsius and water temperature 28 degrees Celsius.
November to April is dry with temperatures reaching 32 degrees Celsius in November, rising steadily to reach 36 degrees in April. Minimum temperatures during this time vary between 22 and 26 degrees Celsius. This is a good time to go to Koh Samet since the sea is conducive to boat travel, underwater visibility is good for scuba divers an you can spend sunny days on the beach.
May to December is rainy season, but does not mean you have rain days on end. On the contrary, rain comes in the form of a thunder storm, which can be nice and cooling, followed by sunshine and humidity, so still lots of time to catch a tan. The down-side is scuba diving will not be on the agenda and boat travel is erratic due to rough seas. Temperatures start dropping from 34 degrees Celsius in May to 30 degrees Celsius in October. Minimum temperatures during this time average 24 degrees Celsius.