April in Fort William is the sunniest month of the year. In April, the weather in Fort William is typically cold. Average daily high temperature in April is about 7 degrees above zero. On average, Fort William has 22 rainy, 3 sunny, 3 partly cloudy, and 2 cloudy days in April. The rains are usually heavy. April as well as January, February, March, and May is considered the most uncomfortable time to visit Fort William.