Thailand has a tropical climate and three seasons:

Rainy Season: The southwest Monsoon comes from the Indian Ocean with rain-laden clouds, from about June to October. It dose not rain every day so there is still plenty of sunshine. The humidity makes it feel hot and sticky. When it starts to rain, it only takes a few seconds for the roads flood and the traffic to come to a standstill. In most tropical countries there is no point in wearing raincoats as you will get wet from sweating than you will from the rain! "Monsoon comes from the Arabic mawsin (season)". It refers to South Asia's seasonal winds (not heavy rain). In Thailand, the southwest monsoon is the rainy season; the northeast monsoon is dry, called the cool season.

Cool Season: The northeast monsoon from central Asia usually blows from November to February, bringing relatively cool, dry conditions to Thailand. This is the best time to visit Thailand.

Hot Season : Between the two monsoons, March to May, the land heats up, creating an area of low pressure above it. Eventually the high pressure over the Indian Ocean moves inland, and the monsoon cycle begins again. This is the hottest time of the year so the school closes for a two month long break.

Average temperatures and rainfall: In Bangkok and the Central Region, rain averages about 200 mm monthly from May to October, and temperatures average 24°C to 32°C. In the north and north-eastern regions, rain averages 160 mm monthly and temperatures range from 23°C to 31°C

 

During the Cool Season, the temperature drops to an average 21°C the Central Region and 14°C in the North.

Winter-December	Summer-April

The climate is tropical, with a average annual daily temperature of 28°C to 30°C and high humidity.

It is very hot in the Central Plains and in the South, and Cooler in the northern hills.

Overall best time to visit is November to March when days are mostly dry and the humidity lower, although Kho Samui is best from June to September.

It's hot, all year round day and night - Bangkok was actually recognized as the hottest city in the world by the World Meteorological Organization. This is mainly down to the fact that there is a minimal change in temperature between the day and night. Daytime temperatures will rarely drop much below 30°C and can go up above 40°C

The hottest months are April - June,  November - March are the coolest. The cool season is more pronounced in the North of the country, The South has little variation at any time of year. There is a rainy season during July to October, but travel during this period is not so bad - see the Information Before you go.

The Sun rises at about 6am-6.30am and Sets around 6.00 - 6.30pm  all year round.

 For up to date weather information  click here.

Thailand climate varies from Tropical in the South to Sub-Tropical in the North and Northeast. Except for Thailand's Southern region there are 3 seasons. The hottest weather is from March to May, and May is the beginning of Rainy season. Expect Rain until mid November. The Mild Season in Thailand extends from mid November till February.
The South has additional Rainy Seasons as do the Gulf of Siam and the Andaman Sea.

During the Rainy Season In most parts of Thailand it dose not rain all day. And much of the time the rains come at night. What is common is either a sudden shower or even an hour or more of torrential rain followed by sunshine. The South will have more "all day" type rain.

Weather Variations for Regions of Southern Thailand

South - The climate of Southern Thailand is influenced by the Southwest monsoon and Northwest monsoon winds and sea breezes, as well as depression storms. The Phuket and Nakhorn Sri Thammarat mountain ranges block the Southwest monsoon winds and thus the South and West of the region are the rainiest parts of Thailand. The South has 2 seasons, the Rainy Season, from May to December, and the Dry Season, from January to April.

Gulf of Thailand - From January to August most days will be Sunny. March and April are the hottest. October starts the Rainy Season which last until January with frequent showers then sunshine. Water sports enthusiasts and divers should be aware that the sea can be rough at this time and undersea visibility will be limited.

Andaman Sea - The area around Phuket has a Tropical Monsoon Climate. It is warm year round with two hot seasons, April-May and September-October. The September-October Hot Season is also the Wettest.

November till March is the Mild Season and is influenced by the Northeast Monsoon.

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