The negative assessment on Yoon's conduct of state affairs gained 2.6 percentage points to 40.3 percent, according to local pollster Realmeter.
Support for the ruling conservative People Power Party dipped 1.0 percentage point over the week to 49.8 percent last week.
The main liberal opposition Democratic Party's approval rating rose 0.5 percentage points to 38.2 percent.
The minor progressive Justice Party garnered 4.0 percent of support score last week, up 0.3 percentage points from the prior week.
The results were based on a survey of 2,007 voters conducted from last Monday to Friday except for Wednesday when local elections were held. It had plus or minus 2.2 percentage points in margin of error with a 95 percent confidence level.
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