Blue Sky Over Samui - Koh Samui Weather
Blue Sky over Koh Samui

Koh Samui Weather – one of the questions most frequently to us, is, what is the weather going to be like on Koh Samui?

If you’re coming to Thailand then you will want to know the Koh Samui Weather.  Like anywhere, Koh Samui does have its fair share of different weather patterns.

When I first came to Thailand, the first thing I was told regarding the weather here is that Thailand actually has three seasons and not the conventional seasons we may know in the West, yet seasons none the less.

Seasons of Samui

weather koh samui
Koh Samui Weather

These three seasons were described to me like this;

first season is – ‘Hot’

second season is – ‘Hotter’

third season is ‘Oh My God.’

Not the most up-to-date or descriptive weather report I had heard granted, the funniest, definitely.

Samui is one of Thailand’s top travel destinations and the third biggest in the country.  It is well known for water sports, adventure activities, shopping, great cuisine, and some fantastic sightseeing adventures.

Koh Samui Weather is always warm and usually sunny for most of the year.

The busiest time of the year is between December and March; also the months of July and August are also very busy.

Koh Samui is the largest island in the Chumphon Archipelago. This includes the islands of Koh Phangan and Koh Tao, as well as the wonderful National Marine Park of Angthong. All of which can be easily reached by boat on a day trip.

During the high season (December to February), temperatures on Samui are usually quite consistent and typically being around 30°C. However, it is possible to encounter some downpours in December although they never last long.

The seas are usually calm with only moderates swells and light breezes. Because of this the low tides can lead to very low tidal movements exposing much of the beaches.

MonthJanuaryFebruaryMarchAprilMayJuneJulyAugust SeptemberOctoberNovemberDecember
Max Temp313132333433323130313030
Min Temp222324252525252424242424
Water temp2727 28282929 282928272728
Sunshine Average Daily Hours889777788777
Rain in mm’s2810126218011314312321026030298

Between the months of March and June, the weather can get hot, it is not unusual for the temperatures to hit highs of 40C°.

With very little, if any, rain during these months it can become a problem with the demand for water on the Island.

Koh Samui Weather
Koh Samui Sunset


The weather changes again around May the winds start to get stronger usually in the late in the afternoon; this is also a great time to watch some fantastic thunderstorms.

The weather on Samui between July and September is a little cooler, with the monsoon season that brings occasional thunderstorms and at times heavy rain.

These are also popular months for visitors as is the summer holiday in the western world, and Koh Samui can who can guarantee lots of sunshine during their holiday.

During October and November there is more rain than the other months, although even then, it doesn’t normally rain all day and every day.

Koh Samui is unlike many other parts of the country, as it does not have a prolonged or foreseeable rainy season.

Even during the wettest times of the year, there is rarely more for than two or three days without sun, even during November; which is commonly considered to be the wettest month.

Contact Easy Day Samui Tours

Things to Do in Koh Samui

There plenty of Things to Do in Koh Samui. Therefore we created a Shortlist of the best Tours & Activities in Samui.