Forex dealers said fresh demand for the US unit and a weak opening of the domestic equity market weighed on the rupee.
However, dollar's weakness against other currencies overseas after a US presidential election poll showed Donald Trump ahead of market favourite Hillary Clinton minimised the loss, they said.
Yesterday, the rupee had closed 8 paise higher at 66.71 against the US dollar on sustained dollar unwinding from exporters and banks at the Interbank Forex Exchange market.
Meanwhile, the benchmark BSE Sensex plunged by 288.06 points or 1.03 per cent at 27,588.55 in early trade today.