March in Ollon is the windiest month of the year. In March, the weather in Ollon is typically cold. Average daily high temperature in March is about 9 degrees above zero. On average, Ollon has 11 rainy, 9 sunny, 9 partly cloudy, and 2 cloudy days in March. The rains are usually heavy. March as well as January, February, April, and May is considered the most uncomfortable time to visit Ollon.