January in Cascais is the rainiest and the cloudiest month of the year. In January, the weather in Cascais is typically warm. Average daily high temperature in January is about 14 degrees above zero. On average, Cascais has 15 rainy, 10 sunny, and 6 partly cloudy days in January. The rains are usually heavy. January as well as {{month_nom: February}}, and {{month_nom: February}} is considered the most uncomfortable time to visit Cascais.