The current rating is the worst for September in two years.
A year ago, 44 percent of respondents rated the economy as poor, while 46 percent gave the economy similar marks a year prior.
In addition, 62 percent currently say that economic conditions are "getting worse," compared to 54 percent who held the same view in September 2009.
"Gallup's confidence data also suggest that Americans' perceptions of the economy continue to diverge from those on Wall Street," the organization states. "Economists' declaration that the recession was over as of mid-2009, and the perception that this eliminated the possibility for a double-dip [recession], may have encouraged investors, who drove the Dow up to what may be its best September in 70 years. However, this seems to have done little to change perceptions on Main Street."