August in Stirling is the rainiest month of the year. In August, the weather in Stirling is typically warm. Average daily high temperature in August is about 15 degrees above zero. On average, Stirling has 26 rainy, 3 sunny, and 2 cloudy 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 Stirling.