August in Fort Lauderdale is the hottest month of the year. In August, the weather in Fort Lauderdale is typically hot. Average daily high temperature in August is about 30 degrees above zero. On average, Fort Lauderdale has 20 rainy and 11 sunny days in August. The rains are usually heavy. August as well as June, July, September, and October is considered the most uncomfortable time to visit Fort Lauderdale.