December in San Sebastian de La Gomera is the rainiest and the cloudiest month of the year. In December, the weather in San Sebastian de La Gomera is typically warm. Average daily high temperature in December is about 19 degrees above zero. On average, San Sebastian de La Gomera has 17 sunny, 8 partly cloudy, 5 rainy, and 1 cloudy day in December. The rains are usually light.