December in Brest is the windiest month of the year. In December, the weather in Brest is typically warm. Average daily high temperature in December is about 10 degrees above zero. On average, Brest has 23 rainy, 4 sunny, and 4 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 Brest.