December in Eastbourne is the windiest month of the year. In December, the weather in Eastbourne is typically cold. Average daily high temperature in December is about 8 degrees above zero. On average, Eastbourne has 17 rainy, 7 partly cloudy, 5 sunny, and 2 cloudy days in December. The rains are usually moderate. December as well as January, February, October, and November is considered the most uncomfortable time to visit Eastbourne.