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ThailandThe climate of Koh Samui
The current climate in Koh 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 Koh Samui, Thailand.
Temperature records
The highest temperature recorded in Koh Samui in recent years was 39°C in March 2015. The lowest daytime temperature recorded was 25°C in January 2019.
Rainfall amount
On average, Koh Samui receives 2170 mm of precipitation each year. For comparison, New York gets 1142 mm of precipitation annually.
The typhoon season in Koh Samui runs from June to November.
Best time to visit Koh Samui?
The best time to visit Koh Samui for sunny weather is February through April and August. During this period, you'll have nice temperatures and not too much rain, making it a great time to visit Koh Samui. In the other months of the year, there's too much rain or the temperature isn't ideal for a visit if you want sunny and pleasant weather.
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Climate Table of Koh Samui
The climate table of Koh 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 | 27 | 28 | 27 | 27 | 27 | 27 | 26 | 26 | 26 |
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| Precipitation (mm) | 154 | 82 | 50 | 116 | 162 | 132 | 136 | 112 | 142 | 234 | 489 | 361 |
| UV Index | 8 | 9 | 9 | 9 | 8 | 8 | 8 | 8 | 8 | 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.
Temperature charts
These charts display the average temperatures in Koh 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 Koh Samui
Yearly Temperature in Koh Samui
Precipitation charts
These charts show the average amount of precipitation in Koh 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 Koh Samui
Total Yearly Precipitation in Koh Samui
UV index chart
This chart shows the average UV index per month in Koh 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 Koh Samui
Weather experiences in Koh Samui
The weather in Koh Samui is rated an average of 3,4 out of 5 stars by 8 visitors. Have you been to Koh Samui? Share your weather experience to help other visitors.
Nina
Expect lots of sunshine, but be prepared for the occasional rain shower!
MaxHeavy rainfall followed by sunshine has created an unpredictable climate. Visitors should expect both sunshine and rain.
WilcoSunny, warm weather with rare brief showers. For people who like a tropical climate, it was a paradise on earth.
Thijmen BastiaansenIt rained frequently, but fortunately there were also sunny periods. Most of the time the temperature was around 32 degrees. Ideal for lovers of tropical weather, but a bit wet.
TamarThe rainy season brings some unpredictability, but temperatures remain pleasant. Perfect for beach days!
TiesThe warm temperatures were perfect for beach days. Even though it is a little humid at times, I am very satisfied.
Martha DragstraWonderful , beautiful weather every day and if it rained a bit I just liked it. a quiet beach where I stayed I went to Koh Samui Bophut every year for two months in recent years and well in that fine resort Palm Beach. My last trip was 10-1 - 2019 unfortunately corona came between. I miss it very much. by circumstance illness and age also plays a role, so I hope that, that was not the last trip was, to that cozy wonderful Thailand.
Have you been to Koh Samui?
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Average weather in Koh Samui by month
Click on a month below to see detailed weather info for Koh Samui. Based on historical weather data, you can see the average temperature, precipitation, wind, and UV index for each day of the month.