January in Heraklion is the rainiest month of the year. In January, the weather in Heraklion is typically warm. Average daily high temperature in January is about 13 degrees above zero. On average, Heraklion has 15 rainy, 8 partly cloudy, 7 sunny, 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 Heraklion.