I am a retired US citizen with a Temporary Resident visa. Can I renew it from outside China?

My Temporary Resident visa (based on marriage) expires in Sept. I will be out of China part of July, all August and most of September. As my visa will expire before I return to China, is it possible to renew the visa at a Chinese Embassy in America? I hate to terminate my trip early but do not want to give up my Temporary Resident status. Any advice?