January in Cadiz is the cloudiest and the coldest month of the year. In January, the weather in Cadiz is typically warm. Average daily high temperature in January is about 15 degrees above zero. On average, Cadiz has 12 sunny, 8 rainy, 7 partly cloudy, and 4 cloudy days in January. The rains are usually moderate. January as well as March and December is considered the most uncomfortable time to visit Cadiz.