January in La Teste-de-Buch is the rainiest and the coldest month of the year. In January, the weather in La Teste-de-Buch is typically warm. Average daily high temperature in January is about 10 degrees above zero. On average, La Teste-de-Buch has 19 rainy, 6 sunny, 5 partly cloudy, and 1 cloudy day in January. The rains are usually heavy. January as well as February, November, and December is considered the most uncomfortable time to visit La Teste-de-Buch.