We have around 300 days of sun every year so it is most likely that you will not receive any rain during your tour with us. But we are in the mountains and the weather can change quickly so please always carry a rainjacket with you.
The difference of temperature between the high mountains and the valleys is big. It is not uncommon to have 10 C at your highest point of the route and then 28 C by the hotel at the end of the day.
The best weather site for the local weather is Meteoblue. They also have an excellent app that we recommend that you install.