The negative assessment on Yoon's conduct of state affairs slipped 2 percentage points to 64 percent, according to local pollster Gallup Korea.
Support for the ruling conservative People Power Party added 2 percentage points to 33 percent this week compared to the previous week.
The main liberal opposition Democratic Party's popularity rating decreased 3 percentage points to 29 percent.
The minor left-leaning Rebuilding Korea Party posted 9 percent of support score this week, while the minor center-right New Reform Party logged 4 percent of approval score.
The results were based on a survey of 1,002 voters conducted from Tuesday to Thursday. It had plus and minus 3.1 percentage points in margin of error with a 95-percent confidence level.
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