In December, the weather in Seagrove Beach is typically cold. Average daily high temperature in December is about 8 degrees above zero. On average, Seagrove Beach has 12 sunny, 9 rainy, 9 partly cloudy, and 1 cloudy day in December. The rains are usually heavy. December as well as January, February, March, and July is considered the most uncomfortable time to visit Seagrove Beach.