We did this trek in July and had perfect blue sky weather every day, but rain on the last day for the walk into Zermatt. The trek for us was one of the best European treks we have done and was very challenging/tough but extremely rewarding with stunning and changeable scenery every day. We really enjoyed the camping although the mountain huts and auberge were a little close for comfort but manageable once you got use to the idea of sleeping closely with other people!!
This trek had it all for us. High col passes, snow walking and bum sliding, steep ascents, steep descents, rough terrain, boulder jumping, chains, forests, gushing rivers, waterfalls and lakes and absolutely stunning snow capped mountains and scenery.
However, we were a little disappointed that the itinerary was not followed on the first day of walking and we missed not starting from the teleferique at Plan Praz and also the high level contour walk with ladders and chains.