August in Alloa is the rainiest month of the year. In August, the weather in Alloa is typically warm. Average daily high temperature in August is about 16 degrees above zero. On average, Alloa has 26 rainy, 4 sunny, and 1 cloudy day in August. The rains are usually heavy. August as well as January, February, March, and April is considered the most uncomfortable time to visit Alloa.