January in Sanmenxia is the coldest month of the year. In January, the weather in Sanmenxia is typically cold. Average daily high temperature in January is about 2 degrees above zero. On average, Sanmenxia has 16 sunny, 13 partly cloudy, and 2 cloudy days in January. January as well as February, November, and December is considered the most uncomfortable time to visit Sanmenxia.