Aug 19, 2011 - 11:40 AM
Although weather is and will be quite unpredictable these years (...), well, that's my answer exactly. My husband and I have spent weeks in spring and fall, and had all the luck of the world. We even hiked at rather high altitudes in our t-shirts and sometimes it felt like "too warm".
So you never know. If I were you, I would bring some fleeces and t-shirts. Hopefully this information
may be of any help. For short: bring some clothing for every situation and not too much. You never know, and you know what? That's one of the charms of Switzerland.
Wishing you a very nice trip,