December in Sankt Augustin is the rainiest, the windiest, and the cloudiest month of the year. In December, the weather in Sankt Augustin is typically cold. Average daily high temperature in December is about 5 degrees above zero. On average, Sankt Augustin has 22 rainy, 4 cloudy, 3 sunny, and 2 partly cloudy days in December. The rains are usually moderate. December as well as January, February, and November is considered the most uncomfortable time to visit Sankt Augustin.