Planning for the weather is a good way to make your trip to Arouca relaxing and enjoyable, especially when you’re splurging. The hottest months are usually August and July, with an average temperature of 20°C, while the coldest months are January and February, with an average of 10°C. The rainiest months in Arouca are December, October, January and November, with each month seeing an average of 195 mm of rainfall.