August in Havana is the hottest month of the year. In August, the weather in Havana is typically hot. Average daily high temperature in August is about 31 degrees above zero. On average, Havana has 16 rainy, 13 sunny, and 2 partly cloudy days in August. The rains are usually heavy. August as well as June, September, and October is considered the most uncomfortable time to visit Havana.