Sunday's figure was slightly down on the midday participation rate of 28.54 recorded during the first round of the election on April 23.
Overall turnout for French presidential elections is generally high, at around 80 percent.
Sunday's election pitting centrist Emmanuel Macron against Marine Le Pen of the far right falls in the middle of a three-day weekend in France.
It is the first in the six decades of the Fifth Republic in which neither the traditional left nor right has a candidate.
The interior ministry is to issue the next turnout figures at 1500 GMT, while first estimated results are expected shortly after 1800 GMT.
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