Planning for the weather is a good way to make your trip to Penafiel relaxing and enjoyable, especially when you’re splurging. The hottest months are usually August and July, with an average temperature of 21°C, while the coldest months are January and February, with an average of 9°C. The rainiest months in Penafiel are December, October, January and November, with each month seeing an average of 201 mm of rainfall.