August in Aviemore is the cloudiest month of the year. In August, the weather in Aviemore is typically warm. Average daily high temperature in August is about 12 degrees above zero. On average, Aviemore has 28 rainy and 3 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 Aviemore.