January in Oldenburg is the coldest month of the year. In January, the weather in Oldenburg is typically cold. Average daily high temperature in January is about 3 degrees above zero. On average, Oldenburg has 16 rainy, 12 cloudy, and 3 sunny days in January. The rains are usually moderate. January as well as February, November, and December is considered the most uncomfortable time to visit Oldenburg.