January in Edinburgh is the sunniest and the coldest month of the year. In January, the weather in Edinburgh is typically cold. Average daily high temperature in January is about 6 degrees above zero. On average, Edinburgh has 13 rainy, 8 partly cloudy, 5 sunny, and 5 cloudy days in January. The rains are usually moderate. January as well as February, March, April, and May is considered the most uncomfortable time to visit Edinburgh.