May weather forecast and climate
Ko Samui, Thailand

The scenic view of the striking Angthong National Marine Park in Ko Samui, Thailand, calm clear water all around
The scenic view of the striking Angthong National Marine Park in Ko Samui, Thailand, calm clear water all around

What is the temperature in May in Ko Samui?

In May, in Ko Samui, the average high-temperature is 32.5°C (90.5°F), and the average low-temperature is 25.7°C (78.3°F).
Average temperature in May - Ko Samui, Thailand
  • Average high temperature in May: 32.5°C

The warmest month (with the highest average high temperature) is April (32.6°C).
The month with the lowest average high temperature is January (29°C).

  • Average low temperature in May: 25.7°C

The month with the highest average low temperature is April (26.1°C).
The coldest month (with the lowest average low temperature) is December (23.9°C).

Average humidity in May - Ko Samui, Thailand
  • Average humidity in May: 80%

Months with the highest relative humidity are October and November (85%).
Months with the lowest relative humidity are June, July and August (78%).

Average rainfall in May - Ko Samui, Thailand
  • Average rainfall in May: 155.9mm

The wettest month (with the highest rainfall) is November (506.6mm).
The driest month (with the lowest rainfall) is February (54.4mm).

Average rainfall days in May - Ko Samui, Thailand
  • Average rainfall days in May: 16 days

Months with the highest number of rainy days are October and November (20 days).
The month with the lowest number of rainy days is March (4 days).

Average sea temperature in May - Ko Samui, Thailand
  • Average sea temperature in May: 30.1°C

The best month for swimming (with the highest average sea temperature) is May (30.1°C).
The coldest month (with the lowest average sea temperature) is January (27.8°C).

Average daylight in May / Average sunshine in May - Ko Samui, Thailand
  • Average daylight in May: 12.6h

The month with the longest days is June (Average daylight: 12.7h).
Months with shortest days are January and December (Average daylight: 11.6h).

  • Average sunshine in May: 6h

The month with most sunshine is February (Average sunshine: 9h).
Months with least sunshine are May, June, July, August, September, October, November and December (Average sunshine: 6).

Average UV index in May - Ko Samui, Thailand
  • Average UV index in May: 12

Months with the highest UV index are February, March, April, May, June, July, August, September and October (UV index 12).
The month with the lowest UV index is December (UV index 10).

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