MUMBAI, India — After years of studying the Indian market, Starbucks Coffee said Monday that it would open its first store here by September through a 50-50 joint venture with Tata Global Beverages, a unit of the largest business group in India.

The announcement comes a year after Starbucks said it was going to enter the market and nearly two months after the Indian government fumbled an effort to attract more foreign investment in its retailing industry.

The companies would not provide details on their investment and how many stores they want to set up, but a senior Tata executive said at a news conference that there could be 50 stores by the end of the year and speculated that Starbucks could eventually have 3,000 locations.

Starbucks will arrive in India just as policy makers are struggling to bolster growth and interest by foreign investors. The Indian economy is expected to slow to 7 percent growth in the current fiscal year, which ends in March, from 8.5 percent the year before.