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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 |
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Temperature graph
This graph shows the average maximum temperature (red) and minimum temperature (blue) for Koh Samui.
Precipitation graph
This graph shows the average amount of rainfall per month for Koh Samui.
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.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 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 |
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
| Precipitation (mm) | 170 | 38 | 83 | 75 | 53 | 60 | 58 | 48 | 63 | 158 | 263 | 197 |
| Days with rain | 19 | 11 | 14 | 14 | 18 | 19 | 20 | 19 | 21 | 24 | 27 | 23 |
| Dry days | 12 | 17 | 17 | 16 | 13 | 11 | 11 | 12 | 9 | 7 | 3 | 8 |
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
| 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 |
| UV-index | 7 | 7 | 7 | 7 | 7 | 7 | 7 | 7 | 7 | 7 | 7 | 7 |
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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