Haha yeah, in general I prefer the middle of the road in terms in terms of temperatures. Nice and warm so you can sit and chill without freezing. I don't mind some sweat during hikes but it shouldn't be too hot, either. Anyways, get the sandbags ready before it's too late. I hope you'll stay dry without them though.
I sadly didn't visit Kings Canyon but I have heared and read lots of good things about it. That sounds exciting indeed. I hope you will be able to get some great pictures to share.
What are you nervous about? With your experience there shouldn't go anything wrong. Are you worried about the conditions? Or is it just the usual nervousness before a trip into unknown wilderness?
Btw. the lakes we were talking about are called Garnet Lake/Thousand Island Lake and are located in the Ansel Adams Wilderness.