WEATHER & CLIMATE IN THAILAND

Thailand’s climate is subtropical throughout most of the country, leading the weather in Thailand to year-round hot and humid conditions. During the hottest months of the year, temperatures regularly top 40° C (105° F). Even during the cooler “winter” season you can expect daily highs to be around 30° C (86° F).
 

There are 3 seasons in Northern (Chiang Mai), North-Eastern (Chiang Rai), and Central (Bangkok City)
Summer Time (from March to June)
Little rainfall, high humidity, and temperatures that can reach 40 °C characterize this season. Even at night, there isn’t much respite from the heat.
Rainy Time (from July to October)
This doesn’t mean four months of constant downpours, though. Days usually start off sunny, with thunderstorms and heavy rains arriving in the afternoon or evening. The rain often offers some relief from the summer heat. Flash floods are common in the flatter Central region, including Bangkok.
Wintertime (From November to February)
While hardly comparable to the icy, snowy winters in many countries, this is the season when Thailand “cools off.” From November to February, daily humidity drops to 50% – 60%, and temperatures stay at a relatively comfortable 30 – 35 °C. The winter months are Thailand’s most pleasant season.

There are 2 seasons in Southern of Thailand (beaches)
Western side with Rainy Time (from May to October); Short, intense daily downpours characterize this season.
Eastern side with Rainy Time (from September to December); Short, intense daily downpours characterize this season.
Western side with Dry Time (from November to March); In Phuket and the western side of Southern Thailand, the cooler temperatures and low humidity of this season makes it the most comfortable part of the year.
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