Planning for the weather is a good way to make your trip to Guimarães 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 February and January, with an average of 9°C. The rainiest months in Guimarães are October, December, January and November, with each month seeing an average of 240 mm of rainfall.