April in Ratchaburi is the hottest month of the year. In April, the weather in Ratchaburi is typically hot. Average daily high temperature in April is about 36 degrees above zero. On average, Ratchaburi has 14 rainy, 8 sunny, and 8 partly cloudy days in April. The rains are usually heavy. April as well as May, June, July, and August is considered the most uncomfortable time to visit Ratchaburi.