December weather forecast in Viana do Castelo

In December, the weather in Viana do Castelo is typically warm. Average daily high temperature in December is about 13 degrees above zero. On average, Viana do Castelo has 12 rainy, 10 sunny, 7 partly cloudy, and 2 cloudy days in December. The rains are usually heavy. December as well as January, February, and November is considered the most uncomfortable time to visit Viana do Castelo.