October in Barrie is the rainiest month of the year. In October, the weather in Barrie is typically warm. Average daily high temperature in October is about 12 degrees above zero. On average, Barrie has 18 rainy, 6 sunny, 4 partly cloudy, and 3 cloudy days in October. The rains are usually moderate. October as well as March, April, and November is considered the most uncomfortable time to visit Barrie.