January in Shiraz is the rainiest and the coldest month of the year. In January, the weather in Shiraz is typically cold. Average daily high temperature in January is about 9 degrees above zero. On average, Shiraz has 22 sunny, 5 rainy, and 4 partly cloudy days in January. The rains are usually heavy. January as well as February is considered the most uncomfortable time to visit Shiraz.