January in Mahajanga is the rainiest and the cloudiest month of the year. In January, the weather in Mahajanga is typically hot. Average daily high temperature in January is about 29 degrees above zero. On average, Mahajanga has 27 rainy and 4 sunny days in January. The rains are usually heavy. January as well as February, March, and December is considered the most uncomfortable time to visit Mahajanga.