"We revise our GDP growth forecast downwards by 0.5 per cent to 7.4 per cent from 7.9 per cent, and expect agriculture growth to be 1.5 per cent on a weak base of 0.2 per cent in FY15," it said in a late evening note.
The agency said a second straight year of deficiency in rainfalls can be "very damaging" as the efficacy of irrigation systems would have insufficient to due to last year's inadequate rains.
The Northwest region, which includes Delhi NCR, Haryana, western Uttar Pradesh and Rajasthan will be affected as per the forecast with it receiving around 85 per cent of rainfalls of the LPA. The region had experienced poor rainfall last year as well.
The projection of low rainfalls, which may be attributed to the El-Nino phenomena playing out in the Pacific Ocean, is likely to trigger fears of a drought situation in some parts of the country.
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Reserve Bank Governor Raghuram Rajan flagged the monsoons as the biggest risks and said the government needs to act firmly to ensure that the impact does not seep into becoming into a problem on the inflation front.
The RBI also upped its January 2016 inflation forecast to 6 per cent, up from the earlier estimate of 5.8 per cent.