January in Castellammare del Golfo is the rainiest and the cloudiest month of the year. In January, the weather in Castellammare del Golfo is typically warm. Average daily high temperature in January is about 14 degrees above zero. On average, Castellammare del Golfo has 13 rainy, 9 partly cloudy, 7 sunny, and 2 cloudy days in January. The rains are usually moderate. January as well as February and December is considered the most uncomfortable time to visit Castellammare del Golfo.