August in Vila Nova de Gaia is the warmest month of the year. In August, the weather in Vila Nova de Gaia is typically warm. Average daily high temperature in August is about 22 degrees above zero. On average, Vila Nova de Gaia has 18 sunny, 8 partly cloudy, 4 rainy, and 1 cloudy day in August. The rains are usually light. August as well as July is considered the most comfortable time to visit Vila Nova de Gaia.