What’s the climate like in Koh Samui?
The current climate of Koh Samui features average monthly temperatures ranging from highs of 34°C during the day to lows of 31°C. 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.
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.
On average, Koh Samui receives 2170 mm of precipitation each year. For comparison, UK gets 701 mm of precipitation annually.
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 good 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.
Climate Table of Koh Samui
The climate table of Koh Samui shows the average temperatures, precipitation, and UV index per month. The table gives an overview of the average day and night temperatures in degrees Celsius, the total amount of precipitation in millimetres, the total snowfall in centimetres, and the UV index for each month. Precipitation 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.
- Average yearly temperature: 33°C
- Highest temperature: 34°C in May and June
- Lowest temperature: 31°C in January, February, November and December
- Precipitation: 2170 mm per year, averaging 181 mm per month
- Driest months: 50 mm in March, 82 mm in February and 112 mm in August
- Wettest months: 489 mm in November, 361 mm in December and 234 mm in October
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Table of Contents
Average Temperature per Month in Koh Samui
This graph shows the average maximum temperatures per month in Koh Samui, Thailand. The temperatures are shown in degrees Celsius and the average is calculated based on the recorded temperatures per month from past years.
Average Precipitation per Month in Koh Samui
This graph shows how much precipitation Koh Samui, Thailand, gets on average per month. Precipitation is always measured as water, even if it's snow or hail. This makes it easy to compare how much has fallen, regardless of the form of precipitation. The amount of precipitation is measured in millimetres and the average is calculated based on the recorded precipitation per month from past years.
Average UV Index per Month in Koh Samui
This graph 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.
Yearly Temperature in Koh Samui
This graph shows the average yearly temperature in Koh Samui, Thailand. The yearly temperature, expressed in degrees Celsius, is the average of all twelve monthly temperatures summed up for that year.
Total Yearly Precipitation in Koh Samui
This chart shows the total yearly precipitation in Koh Samui, Thailand, over the past few years. The total yearly precipitation, measured in millimetres, is the sum of all the rain that fell in the twelve months of that year.
Weather experiences in Koh Samui
The weather in Koh Samui is rated an average of 0 out of 5 stars by 8 visitors. Have you been to Koh Samui? Share your weather experience to help other visitors.
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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.
