That was in line with expectations and down from 3.1 percent in July.
On a seasonally adjusted monthly basis, inflation was up 0.1 percent for the second straight month.
Core CPI, which excludes the volatile costs of food, also rose an annual 2.7 percent - again matching forecasts and slowing from 3.1 percent in the previous month.
On a seasonally adjusted monthly basis, core CPI was up 0.2 percent for the second consecutive month.
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