In December, the weather in Jan Thiel Baai is typically warm. Average daily high temperature in December is about 26 degrees above zero. On average, Jan Thiel Baai has 21 rainy, 8 sunny, and 2 partly cloudy days in December. The rains are usually heavy. December as well as January, September, October, and November is considered the most uncomfortable time to visit Jan Thiel Baai.