Weather and seasons on Koh Samui by month. When’s the best time to visit?

Koh Samui climate and weather by month

Koh Samui is a small (229 square kilometers) island in the Gulf of Thailand. The location of its main advantage over another popular among tourists island of Thailand – Phuket – the Gulf of Thailand is calm, there is no tsunami, and the rest is not spoiled by anything unforeseen. This allows Samui to be among the most popular resorts in Thailand – every year there are 3 million tourists, even though the infrastructure on the island is not as developed as in Phuket, and the nightlife is not as active – so it is more suitable for those who like a quiet holiday.

Climate zones Koh Samui

Koh Samui has a hot tropical climate with high humidity and a small annual temperature range. Because of this, the seasons here are differentiated by rainfall rather than by average temperature. The climate is different from the mainland, even though it is located close to the coast: in the summer in Thailand, most days of the sky is covered with clouds, and in Samui it is sunny, and only in the evenings there are brief thunderstorms. The weather here is good in any season, which makes a holiday on the island enjoyable all year round, but it is especially recommended to visit during the winter months.

Tourist Seasons

The high season lasts from December to the end of April. Coral beaches are what the island is primarily proud of, and it is in winter that they attract the most tourists. This is when the weather in Samui is the most “beachy”. And while it’s mostly diving or surfing enthusiasts who come to the island, as well as those looking for an exotic holiday for two in a bungalow, there are parties here too – and in winter there are especially many.

FullMoonParty – the famous parties held every full moon, lasting three nights and attracting several thousand participants. The Full Moon Parties are held on Phangan Island, a particularly beautiful location for a full moon party. Get to it from Samui is very easy, because you only need to overcome a few kilometers

Prices in the high season goes up, and the hotel rooms should be booked well in advance – otherwise you risk to find that they are occupied for three months in advance. So it’s better to book them four months in advance, and if you are planning to come for the New Year – even six months in advance, because tourists from the West at this time come in droves to celebrate Christmas in an unusual atmosphere.

The low season lasts from May to November. Tourist flow decreases because of the beginning of the rainy season, and hotels reduce prices, but even so, for the most part, they are empty. Tourists are frightened by the phrase “rainy season,” many already know what the downpours in Southeast Asia are.

Excursions to Koh Samui - 2022: prices, description, reviews

But in reality on Koh Samui, the rainy season is much milder, and does not prevent a good holiday. In the fall on the island really better not to go – at this time it pours constantly, and from May to August, the rains come 3-4 times a week, mostly in the evening, and not long – half an hour. After them everything dries up very quickly thanks to the heat, so they don’t interfere with the rest at all.

And the sea in summer is calm, and not inferior to the winter – so in the low season in Samui will be very nice to rest, perhaps even more pleasant from the realization of how much it saved! In addition, the sea often has big waves in winter, but in summer it’s perfectly calm. So those who prefer surfing should come in high season, and diving – in low season. And for those who just like to swim in the warm sea or lying by the shore, the calm water is preferable.

Interestingly, Samui prefer tourists from America and Europe, but compatriots can be found on the island not so often – they prefer Pattaya or Phuket.

Excursions to Koh Samui

The best time for excursions – winter, when it’s a little cooler, but in the spring and summer it can be too hot for a long trip. And there’s lots to see! Nature is diverse, you’ll find dense jungle, forests, open spaces, coconut plantations, and waterfalls. You can go to the crocodile farm and see the many exotic reptiles, a tiger zoo, the island of turtles or a butterfly garden. Not only the nature of the remarkable island of Samui, but also the architecture – there are several Buddhist temple complexes.

Koh Samui Weather by Month


These months are popular with tourists from northern countries, where this time of cold winter – because in Koh Samui in January is already established a beautiful weather, the sky is always clear and nothing to hinder the rest. Many people head here for the winter holidays, so prices peak around this time.

March to April

The peak of the high season and the hottest months of the year. The heat is around the clock and precipitation is very low, so you must carefully observe the regime of drinking, and the beach is worth going in the morning or after 4 pm, when the peak of the heat passes.

So why in this heat the island reaches the peak of popularity? It doesn’t rain, so there’s no interruption to your rest, and with flowers blooming everywhere, Samui, beautiful all year round, becomes especially beautiful with a profusion of tropical vegetation. From April 13 to 15, the Thai New Year is celebrated, and then tourists begin to disperse as the rainy season draws near.


While the flowers are still a sight to behold, the months of May are much less favorable from a tourist’s point of view; if in May you can still catch the high season, which some people like to do, in June you can’t. Temperatures are still very high and the increased humidity makes the heat harder to bear. And the sea doesn’t always calm down. Because hotels are empty, and going to Koh Samui in these months is not really recommended.

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The middle of May is Vesak – the holiday of Buddha. It is coincided with the festival, and the temples are decorated with flower garlands and paper lanterns. If you go to Koh Samui at this time, Vesak should not be missed.


It’s quite different during these summer months. Hotels are still empty, so vacation prices are low, with only the rains remaining a problem – but they are not too serious a hindrance. The temperature drops to a reasonable level, the sea calms down and the holiday is at its best – it is in July the best time to go here for quiet holiday lovers who do not want to bump into other tourists everywhere, as well as for those who want to go scuba diving. From mid-August the monsoon season begins to show its effects, it becomes windy and raining during the day.


These three months are combined in the monsoon season, which peaks in November, the worst month to travel to Samui. There are heavy downpours at any time of the day, which can last for five to six hours, and strong winds blowing constantly, stirring up the sea. Although the sky is constantly covered with clouds, it is still hot.


This month is considered the beginning of high season for a reason – the situation at the end of November is already changing for the better, and the rest in December is much more pleasant. Still, in the first half of the month the weather sometimes turns bad if the onset of the high season is delayed. In the second half of December there should be no surprises, but at this time and prices start to rise rapidly.

The seasons on Koh Samui

Samui is eternal summer, fruit and sea. Vacation and winter on the island are loved by many of our countrymen. In choosing where and when to go most important thing to consider the seasonality, not to get all your gadgets wet under the tropical rain or languish in the stuffiness and 45-degree heat. I have been to Samui in different seasons, so I know what I’m talking about, and tell you when it’s better to go here.

In Thailand, conditionally distinguished three climatic seasons:

Although I would call them as follows: hell-hot, hot and the rainy season. In different regions, the timing and characteristics of the seasons are different.

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On Samui, at least, it is always warm. And even in the midst of bad weather is hot and stuffy. It is possible to freeze except on a motorcycle. The problem can almost always be either the heat or the rain.

In Samui are usually distinguished by two seasons: the dry and wet. The dry season from January to April, the wet season from May to December. Sometimes the rainy season is called the whole period from May to December, but more often this characterizes the rainiest part of time from October to December. In general, I would distinguish four logical seasons for convenience:

  1. high season (high season or high season is the world’s most popular time of year for tourists),
  2. hot season,
  3. moderate wet season,
  4. The rainy season.

High season in Koh Samui

This time from January to March is the most pleasant time to travel to Koh Samui and the most popular with tourists. It’s not too hot, it hardly rains, after rainy season the jungle and waterfalls are saturated with moisture, everything blooms and smells, and the sea is calm, azure and warm. In general, goodness!

The most popular time on Koh Samui from mid December to mid January, people come for the New Year and the vacations. Prices at this time are the highest. Especially rents jump, prices for food and food in cheap cafes remain the same. If you want to come to Koh Samui on New Year, book a hotel and tickets as early as possible.

Koh Samui’s Hot Season

From March to May, Koh Samui is in hot season. Temperatures rise to +35 degrees, and sometimes up to +40 degrees. Combined with high humidity at times quite difficult to endure such a heat. Save the air conditioners and the sea. Prices for housing during this period fall, there are not many tourists. Who is not afraid of the heat, you can come here at this time.

The moderate wet season on Koh Samui

From June to September there are surprisingly few tourists. During this time it is hotter than in February and January, sometimes it rains, but on the whole it is quite comfortable and pleasant to be on the island. The rains are usually short, not prolonged, and come in the evening or at night.

Tropical rain – this is also a phenomenon in its own beautiful, in addition, the rains bring freshness and coolness.

And the prices for accommodation are much lower than in the high season. For budget travel, perhaps the best time.

The rainy season on Koh Samui

The rainy season begins in mid-October and lasts until mid-December. It doesn’t rain 24 hours a day, usually at night or in the morning, and it’s quite sunny all day. In general, tropical downpours are powerful and short, passing in half an hour or an hour, leaving behind streams of water that quickly disappear somewhere.

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The main inconvenience is not even so much the rains as the wind, raising waves on the sea. Storms bring debris to the shore, the water is strong waves and do not want to swim.

Seasons on Koh Samui by month

Below I will describe the weather for each month of the year in detail to understand what to expect on specific dates.


Average daytime temperature: 29.7 ° C.

Average number of rainy days per month: 5.

In January, the rainy season should be over, with more sunny days, the sea is calm and you can swim. The New Year brings a lot of tourists and the prices of accommodation, goods and services, I repeat, go up. January is the best time to go to the waterfalls, because they have gained water during the rainy season and became stormy and full of water. Sometimes the rainy season may be prolonged in early January, because it is decided by Her Majesty the weather.


Average daytime temperature: 29.7 ° C.

Average number of rainy days per month: 3.

February is the best month to vacation in Koh Samui. The humidity has dropped, the sun is shining bright but not yet overpowering, the water is blue and clear, and the rain is very rare.

It’s high season, lots of tourists and locals are charging higher prices and making more money.

Average daytime temperature: 30.7 °C.

Average number of rainy days per month: 6.

March as well as February is a good month for vacation. It is sunny, the sea is great and there is almost no wind. It is a little hotter, but not too much. Soon the end of the tourist high season, you can still enjoy the weather.


Average daytime temperature: 31.6 °C.

Average number of rainy days per month: 4.

The thermometer is creeping up, gradually the hot season begins. But so far the situation is not critical, the daytime temperature is a bit hot, up to +35, but usually it gets better in the evening. But it’s at this time a lot of different fruits ripen, the prices in the markets are cheap and you can eat plenty of fresh fruit.

Average daytime temperature: 32.8 °C.

Average number of rainy days per month: 6.

In May, almost all of Thailand is hot. In Bangkok at this time simply unbearable, by the sea, of course, lighter. In May, Samui is almost no wind and rain, the water is very warm.

Average daytime temperature: 32.8 °C.

Average number of rainy days per month: 7.

In June, the hot season is on the decline, with slightly more frequent rain. No crowds, prices fall, you can find great inexpensive cabins.

Average daytime temperature: 32.3 °C.

Average number of rainy days per month: 8.

In July it’s not so hot anymore, the sea is wonderful, calm and pleasant. Sometimes it rains, but not for long, just an hour or two and then the sun comes out again.

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I really like Samui in July, a combination of pleasant climate, no crowds of package tourists and low prices.


Average daytime temperature: 32.1 °C.

Average number of rainy days per month: 4.

August is also very pleasant on the island. It rains but rarely, the sun does not scorch, and there is still time before the peak of the rainy season.


Average daytime temperature: 31.9 °C.

Average number of rainy days per month: 9.

The rainy season is approaching, so the weather is unpredictable. At the beginning of the month it is often still warm and sunny, towards the end of the month it rains more often and the wind blows strongly. There are small waves on the sea.


Average daytime temperature: 31.6 °C.

Average number of rainy days per month: 9.

The rainy season begins. In early October, there are still one or more good, sunny days. But more and more often it rains, the wind brings big waves on the sea. It seems that it is possible to swim, the water is warm, but it is not very pleasant when the waves hit the eyes with salt water.


Average daytime temperature: 31,4 °C.

Average number of rainy days per month: 13.

The rainy season is in full swing. It can rain in a solid wall from morning to evening. Or it can rain for an hour in the morning and then calm down for the day. The weather is unpredictable and changes rapidly. Very high humidity, things are covered with mold. Waves on the sea strong, water turbid, on a coast the garbage is thrown, in water float some sticks, branches, garbage. In general, it is unpleasant to swim.


Average daytime temperature: 30,5°C.

Average number of rainy days per month: 8.

By mid-December, the rainy season is supposed to end. But not always, in 2015 it was also at the end of December.

Gradually, there are more sunny days, the sea calms down, everyone is preparing for the New Year, prices, remember, are soaring almost several times, the high season is ahead.

See for a summary.

Of course, the weather described here is average. No one is immune to large-scale and local weather anomalies. For example, it can be sunny all October and still raining in January. When I was in Samui during the New Year holidays, it was still raining. Anyway, it’s worth asking about the current weather before you go.

In a nutshell, Samui in January-February is the best and most expensive season, March-May is too hot, June-August is cheap and not much rain, September-December is even cheaper, rainy season. Personally, I liked it on Koh Samui just in July.

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