January in Paestum is the rainiest, the cloudiest, and the coldest month of the year. In January, the weather in Paestum is typically warm. Average daily high temperature in January is about 12 degrees above zero. On average, Paestum has 13 rainy, 11 sunny, and 7 partly cloudy days in January. The rains are usually heavy. January as well as February is considered the most uncomfortable time to visit Paestum.