August in Spean Bridge is the rainiest month of the year. In August, the weather in Spean Bridge is typically warm. Average daily high temperature in August is about 15 degrees above zero. On average, Spean Bridge has 21 rainy, 5 cloudy, 3 partly cloudy, and 2 sunny days in August. The rains are usually heavy. August as well as January, February, March, and April is considered the most uncomfortable time to visit Spean Bridge.