The weather is beginning to change toward Fall/Winter conditions. Temperatures on Whitney are forecast to be in the low 2os on the day of your hike. Read and consider Harvey's recommendations and be prepared for much colder weather than you might have anticipated, included the chance for snow showers.
I will be hiking in the Bishop Pass area today and later this week, and will be carrying more clothing than what you mentioned in your post, even though it is a lower altitude than Whitney.
Last edited by Bob West; 09/18/17 06:58 AM.