December in Ubon Ratchathani is the windiest and the coldest month of the year. In December, the weather in Ubon Ratchathani is typically warm. Average daily high temperature in December is about 27 degrees above zero. On average, Ubon Ratchathani has 21 partly cloudy, 9 sunny, and 1 cloudy day in December. December as well as January is considered the most comfortable time to visit Ubon Ratchathani.