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The climate of Thailand
Thailand has a tropical climate that can be divided into three categories. The southern part of Thailand has a tropical monsoon climate (type Am according to the Köppen-Geiger climate classification). The northern part of Thailand has a tropical savannah climate (type Aw). Some small areas have a tropical rainforest climate (type Af). The monsoon climate is characterized by a reasonably long period of drought and a rainy season in which much rain falls (the monsoon). The areas with a savannah climate have relatively dry winters en wet summers. However, the differences in precipitation are less than the areas that have a monsoon climate. The tropical rainforest climate has no dry period. The name rainforest speaks for itself. Whoever wants to visit Thailand needs to bear in mind that it is always warm in Thailand. When you visit one of the many sights the heat might be overwhelming to some. The coldest place during the winter months is the mountain range in the north. At night temperatures are around 10 degrees Celsius on average. During the day temperatures will rise to a tropical 30 degrees Celsius. Along the coastlines and in the city of Bangkok these temperatures will be reached on a daily basis.


Climate information of places and areas in Thailand
The climate information on this page is only brief. Specific information about weather and climate can be found on the climate pages per area or town. As for Thailand the following climate information is available:

Chiang Mai
Chiang Rai
Hat Yai
Hua Hin
Khao Lak
Ko Chang
Ko Samet
Ko Samui
Ko Tao
Phi Phi Islands
Udon Thani

Always warm
When you travel to Thailand you have to allow for sweltering heat. Dependant on your location and the month you are in climate can be (very) moist and clammy. During the winter months temperatures are between 28 and 33 degrees Celsius on average. During spring and summer temperatures reach a mere 30 to 36 degrees Celsius. April is the warmest month in Thailand. During the month of May the rainy season starts in the greater part of the country. The rain makes for less hot temperatures. During this period temperatures above 35 degrees Celsius are uncommon. The climate is most uniform on the islands of Ko Samui and Ko Phangan just east of Thailand. Between the coldest and the warmest month a difference of only 4 degrees Celsius can be measured. Precipitation is also more equally spread out over the year with its peak in autumn in stead of summer.

Almost the entire country has a very clear rainy season or monsoon in which large amounts of rain can fall. In the south western part this period lasts from April/May to September/October. The north eastern part has its monsoon from October to January. During the monsoon within a short period of time a large amount of rain will fall. Rain usually falls in the afternoon or in the evening. Rain storms often are no longer than 1 to 2 hours after which it will remain cloudy. In the south western part about 2000 millimeters of rain falls on average on a yearly basis. Along the west coast about 3000-5000 millimeters of rain falls on a yearly basis. The northern part of Thailand is much drier with 1000-2000 millimeters of rain on a yearly basis. On the south side of the Cambodian border climate is a little wetter. The Chantaburi region has a tropical rain forest climate. Rain falls frequently outside the monsoon period. This region has a precipitation figure of 3000 millimeters on a yearly basis.

The winter period is the best time to visit large parts of Thailand. During the months of November and December little rain can be expected in the northern and western part of Thailand. Humidity figures will be lower as well. From February on temperatures will rise until the peak is reached in April. In May the monsoon starts in the greater part of Thailand. Temperatures are moderated by clouds and rain then. The best time to visit Thailand is from the second part of November to the end of March. Most people find April too warm. However, on the tropical beaches temperatures are still bearable. Whoever wants to book a winter sun holiday to Thailand should think of popular destinations as Phuket, Pattaya, Ko Chang and the archipelago of Phi Phi. The islands of Ko Samui and Ko Pangan are situated east of the peninsula. During the month of November large amounts of rain can be expected on these islands. Reasonable amounts of rain can be expected during the months of December and January. From February on a dry period starts and you can enjoy the beautiful beaches and clear sea.

People who enjoy the sun might want to think twice before traveling to Thailand in the summer. Many places are too muggy and too wet; this is caused by the rainy season. Phuket has 300-400 millimeters of rain per month on average. Frequent overcast skies are responsible for only 5-6 hours of sunshine per day. During this period gray days are not uncommon. Late winter and early spring are clear though. A holiday in Thailand during the summer means adjusting, especially if you want to be active.

UV Radiation
In Thailand the UV index is extremely high. Only during the month of December a UV index of ‘only’ 10 out of 11 is reached. In the northern part the UV index is a little lower from October to February. These high numbers mean a high risk of burnt skin and in the long term even skin cancer. During cloudy days the UV index can still be compared to Spain in direct sunlight. Try to avoid direct sunlight in the middle of the day and apply and re-apply sunscreen. Especially be careful with young children and babies.

Hurricanes and tsunamis
Although Thailand is situated in an area with the biggest hurricane activity hurricanes hardly ever occur in Thailand. If there is a tropical depression its force is almost always limited to a tropical storm. Really serious hurricanes often head for the Philippines, Taiwan, China and Japan. Tsunamis are another threat. On Boxing Day 2004 the world witnessed the major destruction of this tidal wave. Thailand was among the countries that got struck by the tsunami. A tidal wave caused by a seaquake can reach heights of tens of meters and cause massive destruction. In theory a good warning system can prevent the large number of casualties, missing people and injured the world witnessed on 26 December 2004. Whether Thailand will get hit by a tsunami of this size again can’t be predicted. When and where it will happen can’t be predicted at all. As opposed to other extremes such as hurricanes, storms, large amounts of rain, large amounts of snow, heat waves or extreme drought there is no specific season for tsunamis. Whoever travels to Thailand shouldn’t be afraid of this natural phenomenon. In case of calamities one should follow instructions given by the government.


Climate figures
The figures below are based on long term weather and climate records and can be seen as an average for Thailand. Local deviations may occur, especially where precipitation figures are concerned. Climate information on specific places and regions is shown on the pages per place.

temperature (°C)


temperature (°C)
hours of sunshine

average days with precipitation
per month
per month
temperature (°C)
January 31 22 9 3 28
February 32 23 9 3 28
March 33 24 8 4 29
April 34 24 8 7 29
May 33 25 7 17 29
June 32 25 6 18 29
July 31 24 6 17 29
August 31 24 6 18 29
September 31 24 5 20 29
October 31 23 6 18 29
November 31 23 7 12 29
December 30 22 8 5 28
= 0-5 mm ● = 6-30 mm ● = 31-60 mm ● = 61-100 mm ● = 101-200 mm ● = over 200 mm
= 0-0.2 inches ● = 0.2-1.2 inches ● = 1.2-2.4 inches ● = 2.5-4 inches ● = 4.1-8 inches ● = over 8 inches

More climate information
Climate tables are useful but they don’t give an overall picture of the climate and possible weather conditions during a period of time. How high the chances are of hot or cold weather or hurricanes can often not be found in these tables. This is why we offer extra climate information per month. The information below is an average for Thailand, but it should be noted that chances of long lasting precipitation in the north eastern part differs. Local deviations may occur in the amount of sunshine. During the winter months the UV index is lower in the northern part.

chance of
(very) hot


chance of
(very) cool
chance of

chance of
chance of
sunny days


click here for the explanation of the symbols


The information at this site was carefully composed from climate data collected by meteorological services, meteorological offices, climate experts and other sources. “More climate info” is based on statistics, climate data and personal experience. No rights can be derived from this site. Weather has no memory and gives no guaranties. Nothing is as changeable and unpredictable as the weather. The authors of this site feel in no way responsible for any damages caused by misinterpretation or other circumstances that may influence your holiday or trip to a certain destination. We provide information, it’s up to the reader to use it to it’s benefit.


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