July in Pervomaysk is the warmest month of the year. In July, the weather in Pervomaysk is typically warm. Average daily high temperature in July is about 24 degrees above zero. On average, Pervomaysk has 16 sunny, 8 rainy, 6 partly cloudy, and 1 cloudy day in July. The rains are usually moderate. July as well as August is considered the most comfortable time to visit Pervomaysk.