January in Sonsonate is the windiest and the sunniest month of the year. In January, the weather in Sonsonate is typically hot. Average daily high temperature in January is about 29 degrees above zero. On average, Sonsonate has 26 sunny, 3 partly cloudy, and 2 rainy days in January. The rains are usually light. January as well as February and December is considered the most comfortable time to visit Sonsonate.