Climate of Koh Samui
Koh Samui has a tropical monsoon climate. You have high temperatures and a lot of rainfall throughout the year. The average annual temperature for Koh Samui is 29° degrees and there is about 1266 mm of rain in a year. It is dry for 107 days a year with an average humidity of 76% and an UV-index of 7.
Climate averages for the whole year
- Day: the average daily temperature during the day is between 28°C and 30°C
- Night:the average nighttime temperature is between 27°C and 29°C
- Rain: it rains 229 days and there is a total of approximately 1266 mm rainfall
- Sun hours: throughout the year there are 3073 sun hours
|Maximum temperature:||between 28°C and 30°C|
|Warmest month:||30°C in May|
|Coldest month:||28°C in January|
|Night temperature:||between 27°C and 29°C|
|Dry days:||136 days|
|Days with rain:||229 days|
|Days with snow:||0 days|
|Total rain sum:||1266 mm|
|Hours of sunshine:||3073 hours|
This graph shows the average maximum temperature (red) and minimum temperature (blue) for Koh Samui.
This graph shows the average amount of rainfall per month for Koh Samui.
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Climate table of Koh Samui
In this climate table you can see at a glance what the average weather per month is for Koh Samui. The data has been collected over a 30-year period, from which an average per month has been derived. From year to year the differences may be larger or smaller, but with this climate table you have a good idea of what the weather for Koh Samui might be like in a given month.
|Day temp. (°C)||28||28||28||29||30||30||29||29||29||29||29||28|
|Night temp. (°C)||27||27||28||28||29||28||28||28||28||28||28||27|
|Days with rain||19||11||14||14||18||19||20||19||21||24||27||23|
|Sun hours per day||8||9||9||9||10||9||8||9||8||8||6||7|
|Wind force (Bft)||3||3||3||3||3||3||3||3||3||3||3||3|
Best time to visit Koh Samui
The best time to visit Koh Samui in Thailand is from February through September. In this period you have a warm temperature and little precipitation. The highest average temperature in Koh Samui is 30°C in May and the lowest is 28°C in January.
Climate of Koh Samui by month
What is the average climate in a given month for Koh Samui? Click on a month to see all monthly averages for sunshine, maximum and minimum temperatures, percent chance of rain per day, snowfall and number of rainy days.
Koh Samui weather experiences
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