March in Penticton is the rainiest month of the year. In March, the weather in Penticton is typically cold. Average daily high temperature in March is about 2 degrees above zero. On average, Penticton has 13 cloudy, 11 rainy, 3 partly cloudy, 2 snowy, and 2 sunny days in March. The rains are usually light. March as well as April is considered the most uncomfortable time to visit Penticton.