“What clothes should I take to Braga/Guimarães?” – You ask yourself when packing.
The Portuguese more accurate forecast website is https://www.ipma.pt/en/index.html.

We can not tell you what to wear but we can show you some data that might be useful:

As you can see on the graphic, Minho region is blue. This means that is the region of Portugal with more rain. Because of this we have the famous green wine (Vinho Verde) that you will see everywhere. So expect some rain.
It rains more on the Second semester. But the positive thing about the rain here is that it rains the whole day – it doesn’t start to rain suddenly in the middle of the afternoon –, so you are prepared for it.
It doesn’t snow! :(

Updated on 2/Feb/2017