August in Cap Cana is the rainiest and the hottest month of the year. In August, the weather in Cap Cana is typically hot. Average daily high temperature in August is about 29 degrees above zero. On average, Cap Cana has 18 rainy and 13 sunny days in August. The rains are usually heavy. August as well as May, June, July, and September is considered the most uncomfortable time to visit Cap Cana.