In March, the weather in Orillia is typically cold. Average daily high temperature in March is about 1 degree above zero. On average, Orillia has 16 cloudy, 7 rainy, 4 snowy, 3 sunny, and 1 partly cloudy day in March. The rains are usually moderate. March as well as April, October, and November is considered the most uncomfortable time to visit Orillia.