July in New Smyrna Beach is the hottest month of the year. In July, the weather in New Smyrna Beach is typically hot. Average daily high temperature in July is about 31 degrees above zero. On average, New Smyrna Beach has 22 rainy and 9 sunny days in July. The rains are usually heavy. July as well as June, August, and September is considered the most uncomfortable time to visit New Smyrna Beach.