January in Fort Augustus is the snowiest, the sunniest, and the coldest month of the year. In January, the weather in Fort Augustus is typically cold. Average daily high temperature in January is about 3 degrees above zero. On average, Fort Augustus has 13 rainy, 12 cloudy, 3 partly cloudy, 2 sunny, and 1 snowy day in January. The rains are usually heavy. January as well as February, March, April, and May is considered the most uncomfortable time to visit Fort Augustus.