January in Lausanne is the coldest month of the year. In January, the weather in Lausanne is typically cold. Average daily high temperature in January is about 2 degrees above zero. On average, Lausanne has 12 rainy, 9 partly cloudy, 8 sunny, and 2 cloudy days in January. The rains are usually heavy. January as well as February, March, April, and May is considered the most uncomfortable time to visit Lausanne.