July in Jacksonville Beach is the hottest month of the year. In July, the weather in Jacksonville Beach is typically hot. Average daily high temperature in July is about 30 degrees above zero. On average, Jacksonville Beach has 18 rainy, 10 sunny, 2 partly cloudy, and 1 cloudy day in July. The rains are usually heavy. July as well as June, August, and September is considered the most uncomfortable time to visit Jacksonville Beach.