January in Mission Beach is the hottest month of the year. In January, the weather in Mission Beach is typically hot. Average daily high temperature in January is about 28 degrees above zero. On average, Mission Beach has 24 rainy, 4 sunny, 2 cloudy, and 1 partly cloudy day in January. The rains are usually heavy. January as well as February and March is considered the most uncomfortable time to visit Mission Beach.