In October, the weather in Fort Saint John is typically cold. Average daily high temperature in October is about 8 degrees above zero. On average, Fort Saint John has 11 partly cloudy, 8 cloudy, 7 sunny, 4 rainy, and 1 snowy day in October. The rains are usually light. October as well as January, March, April, and December is considered the most uncomfortable time to visit Fort Saint John.