January in Newcastle upon Tyne is the rainiest, the windiest, and 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 5 degrees above zero. On average, Newcastle upon Tyne has 21 rainy, 6 cloudy, and 4 sunny days in January. The rains are usually light. January as well as February, March, June, and August is considered the most uncomfortable time to visit Newcastle upon Tyne.