If you’re looking forward to lots of outings with your partner, check out these details about year-round temperatures in Penafiel: The hottest months are usually August and July with an average temp of 69°F, while the coldest months are January and February with an average of 48°F. The rainiest months in Penafiel are December, October, January, and November, with each month seeing an average of 8 inches of rainfall.