July in Black Rock is the rainiest and the cloudiest month of the year. In July, the weather in Black Rock is typically warm. Average daily high temperature in July is about 27 degrees above zero. On average, Black Rock has 27 rainy, 2 cloudy, 1 sunny, and 1 partly cloudy day in July. The rains are usually heavy. July as well as January, June, August, and September is considered the most uncomfortable time to visit Black Rock.