January in Montego Bay is the sunniest month of the year. In January, the weather in Montego Bay is typically warm. Average daily high temperature in January is about 27 degrees above zero. On average, Montego Bay has 26 sunny, 3 rainy, and 2 partly cloudy days in January. The rains are usually light. January as well as December is considered the most comfortable time to visit Montego Bay.