December in Mérida is the rainiest month of the year. In December, the weather in Mérida is typically warm. Average daily high temperature in December is about 13 degrees above zero. On average, Mérida has 11 sunny, 9 rainy, 8 partly cloudy, and 3 cloudy days in December. The rains are usually moderate. December as well as January is considered the most uncomfortable time to visit Mérida.