In March, the weather in Biarritz is typically warm. Average daily high temperature in March is about 13 degrees above zero. On average, Biarritz has 12 rainy, 9 sunny, 8 partly cloudy, and 2 cloudy days in March. The rains are usually heavy. March as well as January, February, November, and December is considered the most uncomfortable time to visit Biarritz.