August in Santo Domingo is the hottest month of the year. In August, the weather in Santo Domingo is typically hot. Average daily high temperature in August is about 30 degrees above zero. On average, Santo Domingo has 24 rainy, 3 sunny, 2 cloudy, and 2 partly cloudy days in August. The rains are usually heavy. August as well as April, May, June, and July is considered the most uncomfortable time to visit Santo Domingo.