July in Posadnikov Ostrov is the sunniest and the warmest month of the year. In July, the weather in Posadnikov Ostrov is typically warm. Average daily high temperature in July is about 22 degrees above zero. On average, Posadnikov Ostrov has 16 rainy, 11 sunny, 3 partly cloudy, and 1 cloudy day in July. The rains are usually moderate.