Russian new-car sales fell 13 percent in June to 122,633, the Association of European Businesses said on Friday.
Registrations for the first six months fell 14 percent to 672,140.
The contraction of Russian car sales in 2016 will be double previous forecasts after weak performance in the first half, according to the AEB. Sales of new cars and light commercial vehicles will contract by 10 percent in 2016 to 1.44 million units, the Moscow-based association said. The previous forecast was for a decline by less than 5 percent to 1.53 million vehicles.
"This forecast implies a slowdown of the negative trend in the second half of 2016, to a level of 6 percent to 7 percent or half of what we have seen so far this year," Joerg Schreiber, chairman of the AEB Automobile Manufacturers Committee, said in the statement.
Russian car sales have been declining for 18 months amid shrinking consumer demand. The reduced forecast suggests automakers don't expect households to step up big purchases until at least next year as the country struggles to exit its longest recession in two decades.
• Download PDF, above right, for June Russia sales by brand and automaker.
After a decade of annual sales growth in excess of 10 percent and the expectation that the market could overtake Germany as Europe's biggest, the Russian auto industry has been badly hit by an economic crisis driven by low oil prices and Western sanctions over the Ukraine.
Last year, car sales fell 36 percent to 1.6 million, according to the AEB.
Bloomberg contributed to this report