December in Estoril is the windiest month of the year. In December, the weather in Estoril is typically warm. Average daily high temperature in December is about 15 degrees above zero. On average, Estoril has 12 rainy, 9 sunny, 7 partly cloudy, and 3 cloudy days in December. The rains are usually heavy. December as well as January, February, March, and November is considered the most uncomfortable time to visit Estoril.