January in Jamaica is the snowiest and the coldest month of the year. In January, the weather in Jamaica is typically cold. Average daily high temperature in January is about 2 degrees above zero. On average, Jamaica has 12 partly cloudy, 9 sunny, 6 rainy, 3 cloudy, and 1 snowy day in January. The rains are usually moderate. January as well as February, March, and December is considered the most uncomfortable time to visit Jamaica.