In May, the weather in Ayutthaya is typically hot. Average daily high temperature in May is about 33 degrees above zero. On average, Ayutthaya has 25 rainy, 4 cloudy, 1 sunny, and 1 partly cloudy day in May. The rains are usually heavy. May as well as June, July, August, and September is considered the most uncomfortable time to visit Ayutthaya.