In December, the weather in Seagrove Beach is typically cold. Average daily high temperature in December is about 7 degrees above zero. On average, Seagrove Beach has 10 partly cloudy, 8 sunny, 7 cloudy, and 6 rainy days in December. The rains are usually heavy. December as well as January, February, March, and May is considered the most uncomfortable time to visit Seagrove Beach.