August in Akumal is the hottest month of the year. In August, the weather in Akumal is typically hot. Average daily high temperature in August is about 32 degrees above zero. On average, Akumal has 22 rainy, 7 sunny, and 2 partly cloudy 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 Akumal.