December in Seville is the rainiest month of the year. In December, the weather in Seville is typically warm. Average daily high temperature in December is about 16 degrees above zero. On average, Seville has 12 sunny, 8 rainy, 7 partly cloudy, and 4 cloudy days in December. The rains are usually heavy. December as well as January, July, and August is considered the most uncomfortable time to visit Seville.