Planning for the weather is a good way to make your trip to Castelo de Paiva relaxing and enjoyable, especially when you're splurging. The hottest months are usually July and August with an average temp of 68°F, while the coldest months are January and February with an average of 46°F. The rainiest months in Castelo de Paiva are December, January, October, and November, with each month seeing an average of 8 inches of rainfall.