The Indian rupee opened lower at 66.12 per dollar as against yesterday's level of 66.03 at the Interbank Foreign Exchange (Forex) market.
It hovered in the range of 66.1750 to 66.10 per dollar during the morning deals, before quoting 66.12 at 1030 hrs.
The dollar index is trading up 0.01 per cent at 99.68 against a basket of six currencies.
"Investors are expected to trade cautiously ahead of the data due this week. The rupee is expected to trade weak taking cues from a strong dollar," a forex dealer said.
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Meanwhile, foreign investors bought shares worth Rs
638.01 crore yesterday, as per provisional data.
In forward market today, premium for dollar showed a easy to steady trend.
The benchmark six-month premium payable in May quoted at 187-189 paise from 188-189 paise and far forward November 2016 contract eased to 396-398 paise against 397.50-398.50 paise yesterday.
The RBI fixed the reference rate for the dollar at 66.4235 and for the euro at 72.1359.
The home currency, however, strengthened further against the euro to end at 71.90 compared to 72.05 earlier.