In May, the weather in Samut Prakan is typically hot. Average daily high temperature in May is about 34 degrees above zero. On average, Samut Prakan has 21 rainy, 6 partly cloudy, 2 sunny, and 2 cloudy days in May. The rains are usually heavy. May as well as April, June, July, and August is considered the most uncomfortable time to visit Samut Prakan.