Tour from August 6 to August 17. What to pack?
I asked this same question in June as we are going August 20 and I was pointed to this posting.
https://community.ricksteves.com/travel-forum/switzerland/clothing-suggestions-ff76ee1f-f1ea-41ad-bfab-fb9c8b950a1a
The consensus was that it will probably be hot and muggy with afternoon thunderstorms so pack light!
When we were in Salzburg in August a few years ago, it was hot, hot, hot. (But what a lovely city!) I can't speak for the other locations as we were on a different RS tour.
We were in many parts of Switzerland last August including the BO and it was very warm and muggy with frequent afternoon thunder storms.