Planning what clothes to take with you for a holiday in Thailand or determining which time to visit is best for you depending on the type of holiday you're wanting to book is quite easy as climate conditions are relatively predictable. In general terms, Thailand's weather can be summed up as cool, hot and wet. This is very true for northern Thailand and most other regions. Meanwhile, the southern part of the country is either wet or dry.
November to February (Cool Season)
The coolest season of the year runs from November to February and is high season in the country meaning you can expect to find more tourists and higher prices. These four months, for tourists, are considered as the best time to be in Thailand as temperatures are slightly lower ranging between 18ºc to 32ºc as are humidity levels. Although these months are marked as the coolest of the year, tourists still tend to feel the heat but luckily cool, dry breezes blow during this time providing great relief. If you're looking for a beach holiday to escape winter time back home, Thailand's majestic islands will make for the perfect getaway.
March to May/June (Hot and Humid Season)
The months of March to May and sometimes June are the hottest and most humid of the year in Thailand. April is known as the most severe. Generally, this time of year can become a little unbearable if you're not used to high temperatures. Expect temperatures to range between 34ºc to 40ºc and humidity levels to reach an exhausting 75%. If you're planning to head to Thailand during the summer period it may be a good idea to stay away from the central plains and head towards the coastlines so that you can plunge into the ocean to refresh yourself often and anytime you need.
June to October (Monsoon Season)
Monsoon season, running from June to October, is the most unpredictable time of the year. It is, however, one of the most beautiful times to be in Thailand as lands flourish and everything is greener. Rainfall is not constant but when it rains it pours and it can happen at any moment so be prepared! Temperatures continue to be pleasant averaging in the high twenty-degrees but humidity sours greatly, many times to levels like 90%. It is also true that many regions can experience such heavy downpours that flooding is known to affect large areas. A thing to note is that many islands off the two coasts of Thailand are closed during monsoon season when conditions take a dramatic turn. Depending on the area and the months, levels of rainfall can vary meaning there are different beach destinations on offer nearly all year round so you will always have options.