Thailand: Weather, Best time to go, Where to go ?

Discover the very best time to visit Thailand from seasonal norms in many locations like Koh Chang or Mae Sot, here.

Best time to go in Southeast Asia?

When is the best time to go in Thailand ?

Throughout the year, the Siamese temperatures range, on average, between 26 and 34° C during the day. The climate in this country is subtropical. Thus, the weather in Thailand is largely influenced by the monsoon phenomenon. This generates significant disparities in terms of heat and rainfall in the northern, central and southern parts of Thailand.

Therefore, when should one visit Thailand? Overall, if one decides to visit between the months of December and March, bad weather won't generally be an issue anywhere. However, if you're hoping for a seaside sunny holiday in the summer (months of July-August), focus on the Gulf Islands rather than Phuket.

So, what is the best time to go in Thailand? Here is some more information to help you in your decision:

  • In Thailand, the weather is at least okay everywhere in January, February and March
  • The most favorable months to visit Bangkok are January, February, March, November and December
  • On average, the warmest months in Bangkok are January, February, March, April, May and June
  • October is the wettest month in this city
  • The cities with the best climate are Chiang Mai and Khon Kaen with good weather at least 6 months a year
  • The sea temperature is suitable for swimming all the year in Ko Samui

For all information about the climate and the weather city by city in Thailand for a specific month, click on the corresponding line below:

Month Our opinion View Details
partially perfect weather Thailand in january
partially perfect weather Thailand in february
partially good weather Thailand in march
partially good weather Thailand in april
partially okay weather Thailand in may
partially okay weather Thailand in june
partially okay weather Thailand in july
partially okay weather Thailand in august
partially okay weather Thailand in september
partially good weather Thailand in october
partially perfect weather Thailand in november
partially perfect weather Thailand in december

When to go in Thailand by cities


Best time to visit Bangkok

The best months to visit Bangkok are january, february, march, november et december.

Chiang Mai

Best time to visit Chiang Mai

The best months to visit Chiang Mai are january, february, march, october, november et december.

Ko Samui

Best time to visit Ko Samui

The best months to visit Ko Samui are january, february et march.


Best time to visit Pattaya

The best months to visit Pattaya are january, february, march et december.


Best time to visit Phuket

The best time to go to Phuket is january.

Climate and Weather of Thailand

The climate in Thailand is tropical and alternates mainly between two seasons: the dry season and the wet season, often called the green season. Their periods vary by region of Thailand and you can feel the difference if you are in the south towards Phuket and Phang Nga, or in the northern side of the peninsula towards Mae Hong Son. Avoid the months of September and October because although typhoons are rare in the Gulf, their occurrence is still a possibility!

Thailand : Thailande 2004

The Climate in Northern Thailand

The climate in northern Thailand, towards Siem Reap which is the city welcoming Angkor to Cambodia, resembles that of Burma and the town of Loikaw.

Unlike the southern side of the country, there are three well-defined seasons, with a more stable weather forecast. Typically in the north, it will feel colder in the winter and hotter in summer.

The dry season runs from November to May with very high temperatures. This heat can at times become unbearable between the months of March and May. Fortunately, the temperatures become cooler again at night, especially in the mountainous areas. Then follows the cold season from November to February that brings a very fresh breeze and finally, the wet season between the months of May to November, which is shorter than that of in the south.

The Climate in Southern Thailand

There are only two seasons in southern Thailand, around the area of Phuket. However, the seasons are not the same as those on the southwest or southeast sides of Thailand.

In fact, the wet season lasts from April to October in the west and rather from September to December in the east. Regardless of the area in the southern part of the peninsula, there is without a doubt more rain than in the north!

The Climate in the Gulf of the Siamese Islands

In the Gulf Islands like Koh Samui, Koh Tao and Koh Phangan, the climate is pleasant throughout the year, with mild and warm temperatures without it being too stuffy. There are three seasons, including:

- The hot season from February to May,

- The end of the rainy season between September and November, with a few timely and large tropical showers,

- The so-called "fresh" season from October to January.

Thus, during the rainy season between the months of May and October, it remains possible to visit the west coast of Thailand. If the rain is falling heavily, it is usually very short and quickly gives way to the sun. The most popular time to visit the west coast of Southern Thailand is from the month of November to the month of April.

The Climate on the East Coast

The east coast of Thailand, especially towards the area of Pattaya, enjoys a mild weather between the months of June and October, with a particularly pleasant microclimate. Throughout this season, the temperatures are high and rainfall is mainly occurs at night.

The Climate in Central Thailand

The climate in central Thailand also gives pride of place to humidity and moisture throughout the year. Between December and March, the temperatures are very high and it is not until evening that the temperature drops significantly.

Rainfall usually begins around the month of May or June and the monsoon season usually extends until the month of October, coupling rainfall with high temperatures.

Temperatures and rainfall in Thailand

On these 3 graphs, we present the evolution of temperatures of Thailand and rainfall month by month for the cities of of Bangkok, of Chiang Mai, of Ko Samui, of Pattaya et of Phuket, as well as the sea temperature months by month for the coastal cities..


perfect weather
good weather
okay weather
bad weather
very bad weather

Map of Thailand

Hover on cities to obtain information about weather.

About of Thailand

What to do in Thailand ?

Beaches / bathing

Nature and landscapes

Culture and heritage


Suitable for families

Crafts / shopping


Night life

Are these weather information for Thailand reliable?

Climate data for Thailand are raised every day since January 2009.Also, the analysis of these meteorological data for Thailand allows us to determine the average for each month in Bangkok, Chiang Mai, Ko Samui, Pattaya, Phuket, Ayutthaya, Burinam, Chanthaburi, Chiang Rai, Hua Hin, Khao Lak national Park, Khao Sok National Park, Khao Yai National Park, Khon Kaen, Ko Lipe, Koh Chang, Koh Lanta, Koh Phangan, Koh Phi Phi et Koh Tao.

So yes: these data are reliable except in cases of temporary climate disruption in the region.

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