January in Cadiz is the cloudiest 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 15 sunny, 9 partly cloudy, 6 rainy, and 1 cloudy day in January. The rains are usually moderate. January as well as February is considered the most uncomfortable time to visit Cadiz.