The central bank has hiked interest rates to 4.25 percent this year in a bid to support a battered peso currency.
Data through June already shows total sales growth of 10.1 percent and same-store sales growth of 6.8 percent.
The economy grew by about 0.8 percent from the prior quarter.
The Mexican central bank governor said inflation expectations have remained stable despite a slump in the peso, which has hit a series of record lows.
The economy grew by about 0.6 percent from the prior quarter, according to estimates by the national statistics agency.
Mexico's central bank is widely expected to raise its benchmark interest rate from 3 percent when the Fed moves.