December weather forecast in Seaside

December in Seaside is the coldest month of the year. In December, the weather in Seaside is typically cold. Average daily high temperature in December is about 8 degrees above zero. On average, Seaside has 24 rainy, 5 sunny, and 2 partly cloudy days in December. The rains are usually heavy. December as well as January, February, March, and April is considered the most uncomfortable time to visit Seaside.