Can I apply for a visa in SFO as a US citizen even though I am temporarily living in India

I am a US citizen temporarily residing in India. I am scheduled to visit China in the first week of May from India. I am also scheduled to travel to the US in April - leaving India mid April and returning to India late April. Because I may not have sufficient time to get my Chinese one in India before I leave to the US, I am wondering if I can apply for it in the Consulate at San Francisco while I am in the US, even though my travel to PRC will originate from India.