Most of Thailand has a tropical climate which is dominated by the monsoon season.
The temperature in all areas of Thailand typically ranges between 50°F and 100°F throughout the year. Average annual humidity is around 85%. Mountainous regions and any area above sea level may experience cooler temperatures and lower humidity. Thailand receives the majority of its precipitation during monsoon season, but the rest of the year also receives regular rainfall. There is also a difference in rainfall per region. The average annual rainfall for northeast is about 40 inches, but it’s over 150 inches on the peninsula (including in Bangkok).
As in any country, weather depends on your region, but generally, Thailand enjoys a warm, sunny climate with some temperature fluctuation from season to season.
Thai Rainy Season (monsoon season): May to November
Thai Dry Season: December to April (March to May is the hottest time of the year)
When’s The Best Time To Visit Thailand?
November to February is the high season, due to Thailand’s climate being more calm and sunny nationwide.
Not too dry, not too rainy. In Northern Thailand, the dry season starts in November and finishes in May.
June to October is generally the worst period to visit Thailand, as it is full of heavy rainfall.
The climate fluctuates a lot between regions. The southernmost region can be split into two: on the west coast, the wettest days tend to come between April and October, while the east coast gets its share between September and December.
It is not uncommon for expats and nationals to travel from region to region to make the best of Thailand’s weather.
The good thing is, for the rest of the year, sunny days are the norm for Thailand.