This is one of the most pleasant times of year to be in Thailand as November is the start of high season for much of the country.
The West coast of Thailand, which includes Phuket, Krabi, Khao Lak, Phi Phi Island and Koh Yao usually experience long days of sunshine and little rain, although an afternoon downpour is always possible.
Bangkok and Chiang Mai are also in the dry season and Koh Samet is also a great choice for a beach holiday at this time of year, being the driest region of Thailand.
Rainfall in Koh Samui can be quite high in November. Hotels sometimes have very good offers during November, but visitors to Koh Samui and Koh Phangan in November should expect to see plenty of rain.
Temperatures in the mountainous areas of the north are lower between November and March and it can be decidedly chilly in the morning at altitude.