July in Las Vegas is the rainiest, the cloudiest, and the warmest month of the year. In July, the weather in Las Vegas is typically warm. Average daily high temperature in July is about 26 degrees above zero. On average, Las Vegas has 17 rainy, 11 sunny, and 3 partly cloudy days in July. The rains are usually heavy. July as well as January, February, August, and December is considered the most uncomfortable time to visit Las Vegas.