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Weather in Thailand tends to be hot and humid year-round, with only slight regional variation and seasonal change. The climate in Thailand is tropical, and expats will soon become well acquainted with the monsoon, a seasonal wind that can bring heavy precipitation.
For the most part, the weather in Thailand can be broken up into three major seasons: the dry, cool season (November to February), the hot season (March to June) and the rainy season (June to October). The southern part of the country is less predictable and usually only experiences two seasons – the wet season and the dry season.
Temperatures in Thailand move up and down depending on locale; the north is the coolest area and the mercury rises as expats move further south. That said, even during the cool season the daily high can reach 68°F (20°C), and during the hot season average highs settle around 93°F (34°C).
Expats should endear themselves to their umbrella during the rainy season. The entire country receives a fair bit of precipitation during the appointed period, and the southern region receives almost twice as much rainfall as the central and northern regions of Thailand.