I have been looking on the laptop here – I had a link to realtime weather conditions but of course cant find it now… here is a link to the snowpack levels through the CA water resources dept so at least you can watch that disappear. But really by the time you are going I think the weather conditions will be pretty favorable. I hiked into Glen Aulin a couple years ago in July and other than one afternoon shower the weather was pefect. Anywhere near a lake you have a good chance of having mosquito's mainly in the evening so take bug dope.

cdec.water.ca.gov/cgi-progs...NOWDP.html