January in Ischia is the rainiest, the cloudiest, and the coldest month of the year. In January, the weather in Ischia is typically warm. Average daily high temperature in January is about 13 degrees above zero. On average, Ischia has 15 rainy, 9 sunny, 5 partly cloudy, and 2 cloudy days in January. The rains are usually heavy. January as well as February and November is considered the most uncomfortable time to visit Ischia.