January in Portimão is the rainiest and the cloudiest month of the year. In January, the weather in Portimão is typically warm. Average daily high temperature in January is about 14 degrees above zero. On average, Portimão has 14 sunny, 12 partly cloudy, and 5 rainy days in January. The rains are usually moderate. January as well as February and December is considered the most uncomfortable time to visit Portimão.