High altitude & cloud-free camping in mid-August?

Wish there was a special, secret boondocking site. As you eluded to in your OP, the west, southwest, and mountain west have monsoonal weather patterns that peak in August making it hit or miss wherever you go in the region. In our state that is both large and sparsely populated, there are many wonderful dark skies camping spots, one can only hope mother nature complies when attempting to view such an event. We'll keep our fingers crossed for clear skies those nights, hope you get lucky too.