July in Miami Beach is the hottest month of the year. In July, the weather in Miami Beach is typically hot. Average daily high temperature in July is about 30 degrees above zero. On average, Miami Beach has 24 rainy, 3 sunny, 3 partly cloudy, and 1 cloudy day in July. The rains are usually heavy. July as well as June, August, September, and October is considered the most uncomfortable time to visit Miami Beach.