Home / Asia / Thailand / The climate of Ko Samui: when to go to Ko Samui

The climate of Ko Samui: when to go to Ko Samui

This post is also available in: 简体中文 繁體中文 Deutsch

Ko Samui is an island located in the Gulf of Siam, in the south-eastern part of Thailand about 9 degrees north of the equator. The climate of Ko Samui is monsoon tropical characterized by stable temperatures in all seasons with variations of a few degrees between the coldest and hottest months. This climate can be divided into a rainy season and a dry season.

The short dry season of Ko Samui’s climate runs from February to April. While the rainiest months are those between October and December. During the rest of the year the rains fall every day but only for a few tens of minutes. On average, almost 2,000 mm of rain per year fall on the island.

The island’s climate is hot and humid throughout the year. The average maximum temperatures vary between 29 ° C and 32 ° C. While the average minimum temperatures vary between 24 ° C and 26 ° C.

The sea water temperature on the island of Ko Samui is excellent for swimming in the sea at any time of the year.


The best time to travel to Ko Samui are the driest months between February and April. In addition to these, the months between January and September are also good, considering that in this period it rains generally only for a few tens of minutes every day.

Ang Thong National Park


KO SAMUI (3 meters)
Month Average low (°C) Average high (°C) Precip. (mm) Precip. days
January 24,2 29,0 86,2  11,0
February 25,0 29,4 54,4  5,6
March 25,6 30,6 80,8  5,9
April 26,1 32,0 83,1  8,6
May 25,7 32,6 155,9  15,6
June 25,5 32,5 124,1  13,7
July 25,1 32,2 116,3  14,4
August 25,2 32,1 110,9  15,2
September 24,8 31,7 121,7  16,2
October 24,3 30,5 309,8  19,6
November 24,1 29,6 506,6  19,2
December 23,9 29,2 210,3  13,7
YEAR 25,0 31,0 1960,1  158,7

Month Sea Water Temperature °C
January 28
February 29
March 29
April 30
May 30
June 30
July 29
August 29
September 29
October 29
November 29
December 28



This post is also available in: 简体中文 繁體中文 Deutsch

Booking.com Search FlightsImage