August in Prescott Valley is the rainiest and the cloudiest month of the year. In August, the weather in Prescott Valley is typically hot. Average daily high temperature in August is about 31 degrees above zero. On average, Prescott Valley has 15 sunny, 11 rainy, and 5 partly cloudy days in August. The rains are usually moderate. August as well as January and July is considered the most uncomfortable time to visit Prescott Valley.