January in Uthai Thani is the sunniest month of the year. In January, the weather in Uthai Thani is typically hot. Average daily high temperature in January is about 29 degrees above zero. On average, Uthai Thani has 18 partly cloudy, 12 sunny, and 1 rainy day in January. January as well as December is considered the most comfortable time to visit Uthai Thani.