December in Santiago del Estero is the rainiest month of the year. In December, the weather in Santiago del Estero is typically hot. Average daily high temperature in December is about 31 degrees above zero. On average, Santiago del Estero has 11 sunny, 10 rainy, and 10 partly cloudy days in December. The rains are usually heavy. December as well as January and February is considered the most uncomfortable time to visit Santiago del Estero.