January in Shiraz is the coldest month of the year. In January, the weather in Shiraz is typically warm. Average daily high temperature in January is about 11 degrees above zero. On average, Shiraz has 19 sunny, 5 rainy, 5 partly cloudy, and 2 cloudy days in January. The rains are usually heavy. January as well as February, July, and December is considered the most uncomfortable time to visit Shiraz.