At the interbank foreign exchange market, the rupee opened with lower at 65.65 against last weekend close of 65.28 on heavy bouts of dollar demand, despite strong equities.
The domestic currency regained some lost ground at the fag-end to settle at 65.50, showing a sharp fall of 22 paise, or 0.34 per cent.
Forex trading sentiment turned little shaky ahead of the RBI policy meet outcome tomorrow, currency traders said. The apex bank is expected to keep its policy rate unchanged despite a sharp slowdown in economic growth and sudden revival in inflation.
Increased demand for the American unit from importers and corporates along with massive capital outflows largely contributed to the rupee's weakness, traders said.
Even the persistent rise in equity market failed to restrict the fall, a forex dealer said.
The US dollar remained firm in Asian trade, touching the highest level in a month following strong manufacturing data and expectations of potential implementation of long-awaited tax reform by the Trump administration later in the year.
Foreign investors continued to be in exit mode and pulled out over Rs 11,000 crore from Indian equities in September against the back drop of heightened geo-political worries amid concerns over corporate earnings growth.
In the meantime, domestic equities continued to their stellar run for the third straight session, with the flagship Sensex zooming over 213 points to end at 31,497.38, while Nifty surged 71 points to 9,859.50.
The RBI, meanwhile, fixed the reference rate for the dollar at 65.5529 and for the euro at 76.7756.
In cross-currency trades, the rupee continued to rally against the pound sterling to end at 86.81 from 87.39 per pound and hardened against the Japanese yen to finish at 57.96 per 100 yens from 58.03.
It also surged ahead against the Euro to conclude at 76.99 from 77.10 last Friday.
In forward market today, premium for dollar recovered owing to mild pressure from corporates.
The benchmark six-month premium payable in March edged higher to 131.50-133.50 paise from 129.75-131.75 paise and the far forward August 2018 contract also rose to 269.50-271.50 paise from 266.50-268.50 paise.
On the international energy front, crude prices traded almost flat after a steep overnight plunge.