The government has also imposed stockpile limits on some crops.
India received the lowest August rains since at least 1901, raising concerns about weaker crop output and the potential for more export restrictions following the nation's curbs on rice.
The country received 162.7 millimeters of rainfall this month, 36% lower than normal, according to the India Meteorological Department. Total rainfall during June-August was 10% below average, the figures show.
Monsoon rains irrigate about half of India's farmland and are crucial for crops such as sugar and soybeans. Erratic weather has hurt some harvests since last year, forcing the nation to restrict exports of wheat and rice to cool domestic retail inflation that surged to a 15-month high in July. The government has also imposed stockpile limits on some crops.
September rains will be crucial to make up the shortfall as the monsoon nears its end, especially given the onset of El Nino, which can bring drier conditions. Some main rice-growing regions in the east have had poor rainfall, hurting prospects of the biggest monsoon-sown food grain crop in the area, according to the weather office. The cane areas in the western and southern parts have also seen lower rainfall, it said.
Although precipitation in September is forecast to be normal, the four-month monsoon season may end up being below-average, Mrutyunjay Mohapatra, director general of the meteorological department, said at a briefing on Thursday.
Any decline in production of wheat, rice and sugar in the world's second-biggest grower could put more stress on global food supplies and boost prices of major commodities. Rice prices in Asia are hovering near a 15-year high and sugar prices in New York are up more than 25% this year.
Rainfall in the south was 60% below normal in August, the central region received about 47% below average showers, while the northwest witnessed a deficit of about 37%, according to the weather office.
Normal to above-normal rains are expected over many areas of India's northeast and adjoining eastern regions next month, Mohapatra said. The foothills of the Himalayas and some areas of the southern region may also get ample rainfall, he said. The maximum average temperature in August was the highest since 1901 across the county, he added.
Monsoon rains typically commence at the start of June and reach the whole of the country by July 8, before extending through the end of September. They arrived on June 8 this year.
--With assistance from Abhay Singh.
(Except for the headline, this story has not been edited by NDTV staff and is published from a syndicated feed.)