Couple other thoughts:
August: very hot, very dry, very crowded
Bears: there has been only one time I've been there and not seen/hear/saw something a bear left behind, and that was just a day trip.
Coyotes: most often, they are quite vocal in the valley at night
Yosemite Falls: even in early may, when there is ice at the top of the falls, and snow to walk through, the falls trail is still quite busy - but half the people stop at Columbia Rock.
Wawona: the meadow get quite a bit of sun all day long - it runs NW-SE. When the sun sets, it's right down the meadow. Bears, flowers, and fungi abound though.