August in Santiago de Cuba is the hottest month of the year. In August, the weather in Santiago de Cuba is typically hot. Average daily high temperature in August is about 32 degrees above zero. On average, Santiago de Cuba has 22 rainy, 6 sunny, 2 partly cloudy, and 1 cloudy day in August. The rains are usually heavy. August as well as May, June, July, and September is considered the most uncomfortable time to visit Santiago de Cuba.