Is the weather for this weekend, some pretty low temps on sunday/monday, as alarming as it sounds? I have never hiked the sierras after early August and just want some input.
I see several forecasts call for a little precip later Sunday. Temps will be 50 down to 25. You need a good tent, thermal layering, definitely gloves.
This is certainly the "shoulder season" -- winter is not too far away.
More info: Here are the 7-day temperature plots for two backcountry weather sensors...
Upper Tyndall Creek elev 11,400'
Cottonwood Lakes elev 10,150'