January in Newcastle upon Tyne is the coldest month of the year. In January, the weather in Newcastle upon Tyne is typically cold. Average daily high temperature in January is about 6 degrees above zero. On average, Newcastle upon Tyne has 12 rainy, 8 cloudy, 8 partly cloudy, and 3 sunny 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 Newcastle upon Tyne.