In its monthly economic assessment report, the ministry said the country's exports have extended solid growth momentum and the job market has improved despite the fourth wave of the pandemic.
"But uncertainty over domestic demand has continued, centering on face-to-face service segments," the Ministry of Economy and Finance said in the Green Book.
The fourth wave of the pandemic and the toughest-ever virus curbs are feared to dampen improving private spending, potentially sapping economic recovery momentum.
For about two months, the greater Seoul area, home to half of the country's population of 52 million, has been under the toughest social distancing rules, which include business restrictions and a ban on private gatherings of three or more people after 6 p.m.
The number of daily virus cases exceeded 1,000 for the 73rd straight day, with the country adding 2,008 new COVID-19 cases Friday, raising the total to 281,938.
The finance ministry earlier said card spending did not decline amid the current wave of the pandemic in stark contrast from consumption patterns shown during previous flare-ups in virus cases.
Credit card spending grew 7.9 percent on-year last month, marking the seventh straight month of gains. Sales at department stores increased 14.4 percent.
But domestic sales of automobiles fell 7.1 percent on-year, marking the sixth consecutive month of declines, and sales at discount stores slid 2.5 percent in August.
Finance Minister Hong Nam-ki said the potential economic fallout of the current wave of the pandemic will be "inevitable" starting in August.
The government expected Asia's fourth-largest economy to grow 4.2 percent this year. The Bank of Korea forecast economic growth of 4 percent. (Yonhap)