Feb 1, 2011 - 4:32 AM
Hello HikingLizz,
That's really hard to say, because weather is always a bit unpredictable in Switzerland, but my guess would be that you will be better off late August/early September, spoken from my own experience.
By the way, there are hiking tips and day trips on this website which may be of help to you.
Wishing you a wonderful trip,