August in Stratford-upon-Avon is the rainiest and the cloudiest month of the year. In August, the weather in Stratford-upon-Avon is typically warm. Average daily high temperature in August is about 18 degrees above zero. On average, Stratford-upon-Avon has 21 rainy, 4 cloudy, 3 sunny, and 3 partly cloudy days in August. The rains are usually moderate. August as well as January, February, March, and April is considered the most uncomfortable time to visit Stratford-upon-Avon.