thaizer.com

The rainy season in Thailand varies from region to region and is largely dominated by the monsoon. Very broadly speaking, Thailand’s rainy season can be classified as mid-May/June-October. For most of Thailand, the wettest months are usually August-October. However, the Gulf Coast of the southern peninsula (e.g. Ko Samui, Ko Pha Ngan) is affected by the south-west monsoon which can lead to heavy rainfall in November and the beginning of December.

Don’t be put off by the thought of visiting Thailand during the rainy season. Yes, the rain can be torrential, but the weather is still very warm and the downpours are often short and sharp. Bargains can be had with accommodation and the tourist areas are less crowded.

To see how much rainfall you can expect on a month-by-month basis in any given area of Thailand, click on the main menu to the left for the area you are interested in (e.g. Bangkok) and then click on the weather sub-page in the top right-hand corner (e.g. Bangkok weather). Every area page has a weather sub-page which provides a detailed table of statistics. I’ve also listed a simple table below which compares the rainy season months for some popular areas of Thailand.

Statistics from Thai Meteorological Department