ThailandThe climate of Ko Samui
The current climate in Ko Samui features temperatures ranging from a high of 34°C to a low of 31°C throughout the year. The average yearly temperature is around 33°C. At night, temperatures in the colder months average around 25°C and in the warmer months around 27°C.
Average temperatures and precipitation
This chart shows the average monthly maximum and minimum temperatures (in degrees Celsius) and average monthly rainfall (in millimeters) for Ko Samui, Thailand.
Temperature records
The highest temperature recorded in Ko Samui in recent years was 39°C in March 2015. The lowest daytime temperature recorded was 26°C in December 2015.
Rainfall amount
On average, Ko Samui receives 2257 mm of precipitation each year. For comparison, New York gets 1142 mm of precipitation annually.
The typhoon season in Ko Samui runs from June to November.
Curious about the weather in other parts of Thailand? Check out the climate and weather for spots like Bangkok, Chiang Mai, Phuket, or explore other destinations in Thailand.
Best time to visit Ko Samui?
The best time to visit Ko Samui for mild to warm weather is February up to April and August. You might get some rain, but the temperatures are just right to explore Ko Samui.
Climate Table of Ko Samui
The climate table of Ko Samui shows the average temperatures, rainfall, and UV index per month. The table provides an overview of the average day and night temperatures in degrees Celsius, the total amount of rainfall in millimeters, the total snowfall in centimeters, and the UV index for each month. Rainfall is always measured as water, even if it's snow or hail.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
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| Temp. max (°C) | 31 | 31 | 32 | 33 | 34 | 34 | 33 | 33 | 33 | 32 | 31 | 31 |
| Temp. min (°C) | 26 | 26 | 27 | 28 | 28 | 27 | 27 | 27 | 27 | 26 | 26 | 26 |
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| Precipitation (mm) | 155 | 76 | 52 | 121 | 171 | 142 | 156 | 123 | 149 | 253 | 498 | 361 |
| UV Index | 8 | 9 | 9 | 9 | 8 | 7 | 7 | 8 | 7 | 7 | 7 | 7 |
Click on the month name to see more weather details, like daily averages, temperatures, and precipitation for the past years in that month.
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Temperature charts
These charts display the average temperatures in Ko Samui, Thailand. The temperatures are shown in degrees Celsius and are calculated based on data from the past 10 years.
Average Temperature per Month in Ko Samui
Yearly Temperature in Ko Samui
Precipitation charts
These charts show the average amount of precipitation in Ko Samui, Thailand. Precipitation is always measured as water, even when it falls as snow or hail. The amount of precipitation is displayed in millimeters, while snowfall is shown in centimeters.
Average Precipitation per Month in Ko Samui
Total Yearly Precipitation in Ko Samui
UV index chart
This chart shows the average UV index per month in Ko Samui, Thailand. The UV index indicates the intensity of ultraviolet radiation and ranges from 0 to a maximum of 11.
Average UV Index per Month in Ko Samui
Weather experiences in Ko Samui
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Average weather in Ko Samui by month
Click on a month below to see detailed weather info for Ko Samui. Based on historical weather data, you can see the average temperature, precipitation, wind, and UV index for each day of the month.