December in Gig Harbor is the coldest month of the year. In December, the weather in Gig Harbor is typically cold. Average daily high temperature in December is about 7 degrees above zero. On average, Gig Harbor has 12 rainy, 7 cloudy, 6 sunny, and 6 partly 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 Gig Harbor.