In October, the weather in Mont Tremblant is typically cold. Average daily high temperature in October is about 8 degrees above zero. On average, Mont Tremblant has 16 rainy, 7 cloudy, 5 sunny, and 3 partly cloudy days in October. The rains are usually heavy. October as well as January, February, April, and May is considered the most uncomfortable time to visit Mont Tremblant.