August in Vyazha is the sunniest month of the year. In August, the weather in Vyazha is typically hot. Average daily high temperature in August is about 28 degrees above zero. On average, Vyazha has 25 sunny, 5 partly cloudy, and 1 rainy day in August. The rains are usually light. August as well as September is considered the most comfortable time to visit Vyazha.