January in Monterey is the cloudiest month of the year. In January, the weather in Monterey is typically warm. Average daily high temperature in January is about 13 degrees above zero. On average, Monterey has 10 rainy, 9 sunny, 8 partly cloudy, and 4 cloudy days in January. The rains are usually heavy. January as well as February, March, and December is considered the most uncomfortable time to visit Monterey.