Koh Samui
28 to 30°C
3073 hours
sunshine per day
1266 mm
136 days
229 days
0 days

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

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.

Do you want to go to Koh Samui?

These are the travel companies where you can book a trip to 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

Have you been to in Koh Samui?

Leave your Koh Samui weather experience for a chance to win $150!

Your email will not appear with the review and will not be passed on to third parties.
Seen a mistake?

Email us, we are grateful to you.