Monthly 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 coldest month in Ko Samui?

The coldest month in Ko Samui, Thailand, is January, with an average high-temperature of 29°C (84.2°F) and an average low-temperature of 24.2°C (75.6°F).

How many days does it rain in Ko Samui?

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

What month is the sea coldest in Ko Samui?

January is the month with the coldest seawater in Ko Samui, Thailand, with an average sea temperature of 27.8°C (82°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.

What is the driest month in Ko Samui?

The month with the least rainfall in Ko Samui, Thailand, is February when the rain falls for 5 days and typically collects 54.4mm (2.1") of precipitation.

What is the warmest month in Ko Samui?

With an average high-temperature of 32.6°C (90.7°F) and an average low-temperature of 26.1°C (79°F), April is the warmest month in Ko Samui, Thailand.

When is the sea warmest in Ko Samui?

May is the month with the warmest seawater in Ko Samui, with an average sea temperature of 30.1°C (86.2°F). The water temperature above 30°C (86°F) is arguably regarded as unpleasant. The primary purpose of entering the water - cooling down from sunshine and high temperatures - is lost.

What is the wettest month in Ko Samui?

The month with the most rainfall in Ko Samui, Thailand, is November when the rain falls for 20 days and typically aggregates up to 506.6mm (19.9") of precipitation.
Average temperature - Ko Samui, Thailand
Average humidity - Ko Samui, Thailand
Average rainfall - Ko Samui, Thailand

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 - Ko Samui, Thailand

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 - Ko Samui, Thailand

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 / Average sunshine - Ko Samui, Thailand

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

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 - Ko Samui, Thailand

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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