December 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
The first month of the winter, December, is a hot month in Ko Samui, Thailand, with average temperature fluctuating between 32°C (89.6°F) and 23.9°C (75°F).

Temperature

The average high-temperature, in December, is 32°C (89.6°F), while the average low-temperature is 23.9°C (75°F).

Humidity

The average relative humidity in December is 82%.

Rainfall

In Ko Samui, during December, the rain falls for 15 days and regularly aggregates up to 210.3mm (8.3") of precipitation. In Ko Samui, during the entire year, the rain falls for 160 days and collects up to 1960.1mm (77.2") of precipitation.

Sea temperature

In December, the average sea temperature is 28.2°C (82.8°F). Water temperature between 25°C (77°F) and 29°C (84.2°F) is regarded as very warm and enjoyable by all. With these temperatures, water activities are pleasurable, without feeling uncomfortable for prolonged periods.

Daylight

Months with the shortest days in Ko Samui, Thailand, are January and December, with an average of 11.6h of daylight.

Sunshine

Months with the least sunshine in Ko Samui are May through December, with an average of 6h of sunshine.

UV index

With an average UV index of 10, December is the month with the lowest UV index.

What is the temperature in December in Ko Samui?

In Ko Samui, Thailand, in December, the average high-temperature is 32°C (89.6°F), and the average low-temperature is 23.9°C (75°F).

What is the average humidity in December in Ko Samui?

In Ko Samui, Thailand, the average relative humidity in December is 82%.

How much does it rain in Ko Samui in December?

In Ko Samui, in December, during 15 rainfall days, 210.3mm (8.3") of precipitation is typically accumulated.

What is the water temperature in December in Ko Samui?

In December, the average sea temperature in Ko Samui is 28.2°C (82.8°F). For swimming, diving, and other water activities, temperatures between 25°C (77°F) and 29°C (84.2°F) are perceived as very enjoyable and pleasurable for prolonged periods without feeling uncomfortable.

What is the month with the shortest days in Ko Samui?

January and December, with an average of 11.6h of daylight, are months with the shortest days in Ko Samui.

What is the average length of the day in December in Ko Samui?

In Ko Samui, the average length of the day in December is 11.6h.

What is the month with the least sunshine in Ko Samui?

Months with the least sunshine in Ko Samui, Thailand, are May through December, with an average of 6h of sunshine.

How long on average sun shines in December in Ko Samui?

The average sunshine in December in Ko Samui is 6h.

When is the lowest UV index in Ko Samui?

December is the month with the lowest UV index, with an average UV index of 10.

What is the UV index reading in December in Ko Samui?

In Ko Samui, the average UV index in December is 10.
Average temperature in December - Ko Samui, Thailand
  • Average high temperature in December: 32°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 December: 23.9°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 December - Ko Samui, Thailand
  • Average humidity in December: 82%

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 December - Ko Samui, Thailand
  • Average rainfall in December: 210.3mm

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 December - Ko Samui, Thailand
  • Average rainfall days in December: 15 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 December - Ko Samui, Thailand
  • Average sea temperature in December: 28.2°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 December / Average sunshine in December - Ko Samui, Thailand
  • Average daylight in December: 11.6h

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 December: 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 December - Ko Samui, Thailand
  • Average UV index in December: 10

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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