January in Ayutthaya is the sunniest month of the year. In January, the weather in Ayutthaya is typically hot. Average daily high temperature in January is about 30 degrees above zero. On average, Ayutthaya has 18 partly cloudy, 12 sunny, and 1 rainy day in January. The rains are usually light. January as well as December is considered the most comfortable time to visit Ayutthaya.