So was I–on the weekend. Thursday, though, with snow and north winds–brrr! It felt more like December than May.
The middle two weeks in July should be safe, I guess? 
Yes, they’ll be fine. Last week was a bit of a freak snow, according to the news. The weather over the weekend changed and became pleasant; I didn’t need a coat to work in the garden, and it got quite warm in the sunshine. And in July? Phew! Bring shorts and t-shirts and sandals; temps of 30 to 40C are common.
But you can see snow all year-round in the mountains, if you want to. 