Thailand's Weather .firstly ,The beginning of winter is on November to February. However, cold weather is only two or three weeks in late December to early January. During the evening, the temperatures are drop below 20°C. The cold season is generally from November to February. In Bangkok this means it might get as cold as 14°C at the coldest point of the night, but more likely 16°C. In the day it might average around, say, 21°C. Sometimes maybe as low as 19°C and higher up to 26°C. In Bangkok you will only notice about 1 to 3 weeks of unusually cool weather, and then it’s back to the normal heat you’re used to. It only gets hotter the further south you go. furthermore, Winter in the morning fresh air. Winter in the morning is misty, The sun’s shining and cool. It’s clearing up. The weather is fine. Finally, Winter is the best time visit to north of Thailand . Firstly, In the north of Thailand, say Chiang Mai and Chiang Rai, it might get cold enough that you’ll see frost. On a really windy cold night it might even get as low as 4°C (or at least it will feel that cold). Although many of us foreigners vacation in Thailand to flee the winter in our home country, Thais like to travel to northern Thailand to experience what cold weather is like. Even frost on the grass is a white wonder winterland for them. I’ve never heard of snow or even hail in Thailand, but perhaps it happens on very rare occasions?