October in Fort William is the rainiest month of the year. In October, the weather in Fort William is typically warm. Average daily high temperature in October is about 10 degrees above zero. On average, Fort William has 22 rainy, 4 partly cloudy, 3 cloudy, and 2 sunny days in October. The rains are usually heavy. October as well as January, February, March, and April is considered the most uncomfortable time to visit Fort William.