January in Santo Domingo is the rainiest and the cloudiest month of the year. In January, the weather in Santo Domingo is typically warm. Average daily high temperature in January is about 27 degrees above zero. On average, Santo Domingo has 30 rainy and 1 cloudy day in January. The rains are usually heavy. January as well as February, March, April, and May is considered the most uncomfortable time to visit Santo Domingo.