December in Mananjary is the hottest month of the year. In December, the weather in Mananjary is typically hot. Average daily high temperature in December is about 28 degrees above zero. On average, Mananjary has 19 rainy, 8 sunny, 3 partly cloudy, and 1 cloudy day in December. The rains are usually heavy. December as well as January, February, and March is considered the most uncomfortable time to visit Mananjary.