January in Cartagena is the sunniest month of the year. In January, the weather in Cartagena is typically warm. Average daily high temperature in January is about 27 degrees above zero. On average, Cartagena has 22 sunny, 6 partly cloudy, 2 rainy, and 1 cloudy day in January. The rains are usually light. January as well as February and March is considered the most comfortable time to visit Cartagena.