January in Aveiro is the rainiest, the windiest, the cloudiest, and the coldest month of the year. In January, the weather in Aveiro is typically warm. Average daily high temperature in January is about 12 degrees above zero. On average, Aveiro has 15 rainy, 10 sunny, 5 partly cloudy, and 1 cloudy day in January. The rains are usually heavy. January as well as February, November, and December is considered the most uncomfortable time to visit Aveiro.