July in Bol'shaya Seya is the rainiest and the warmest month of the year. In July, the weather in Bol'shaya Seya is typically warm. Average daily high temperature in July is about 22 degrees above zero. On average, Bol'shaya Seya has 16 rainy, 7 sunny, 7 partly cloudy, and 1 cloudy day in July. The rains are usually heavy.