January in Gaziantep is the rainiest, the cloudiest, and the coldest month of the year. In January, the weather in Gaziantep is typically cold. Average daily high temperature in January is about 6 degrees above zero. On average, Gaziantep has 15 rainy, 9 sunny, 6 partly cloudy, and 1 cloudy day in January. The rains are usually heavy. January as well as February and December is considered the most uncomfortable time to visit Gaziantep.