By November, rain is becoming a distant memory for much of Thailand, especially later in the month. Humidity is now also out of the picture as temperatures remain relatively low (by Thai standards).
November is a good time of year to visit Chiang Mai, Chiang Rai and Northern Thailand as the region enjoys predominantly dry, sunny days with pleasant temperatures conducive to outdoor activities. Evening temperatures in the north can be a little chilly so it's worth packing a light jumper. Central Thailand is also experiencing favourable weather conditions making November a good month for sightseeing in and around Kanchanaburi.
For beach lovers, the islands of Koh Chang and Koh Kood are the pick of the bunch in November, with very little rain expected and average temperatures in the region of 28°C. Hua Hin and Cha Am also enjoy plenty of sunshine and minimal rainfall this month. Further south the east coast resorts of Koh Samui and Koh Pha Ngan are in the midst of wet season, so are best avoided in favour of Phuket, Khao Lak and Krabi on the west of the peninsula.