August in Deerfield Beach is the rainiest month of the year. In August, the weather in Deerfield Beach is typically hot. Average daily high temperature in August is about 31 degrees above zero. On average, Deerfield Beach has 27 rainy, 3 sunny, and 1 partly cloudy day in August. The rains are usually heavy. August as well as June, July, and September is considered the most uncomfortable time to visit Deerfield Beach.