January in Guneysu is the windiest and the coldest month of the year. In January, the weather in Guneysu is typically cold. Average daily high temperature in January is about 5 degrees above zero. On average, Guneysu has 16 rainy, 7 sunny, 6 partly cloudy, and 2 cloudy days in January. The rains are usually heavy. January as well as February, March, April, and May is considered the most uncomfortable time to visit Guneysu.