The rupee depreciated 3.6 per cent in August to end at 66.48. The rupee had ended at 64.14 per dollar on July 31.
This was the second worst fall for the rupee and the last one was recorded in August 2013 when during the month the rupee had depreciated by 8.83 per cent.
The fall in rupee recorded in August 2015 was primarily due to the impact of devaluation of yuan by China.
In August 2013 during intra-day trade the currency had touched an all-time low of 68.85 per dollar on August 28, 2013 due to heavy dollar demand from importers. A key cause for the fall in rupee in 2013 was the US Fed hinting at tapering in May.