The Harris Interactive survey, conducted on May 28-30 for LCI television, said Mr Macron’s trust rating stood at 40 percent – a level not reached since June 2018.
The young centrist’s satisfaction rating plummeted to 31 percent at the height of the yellow vest rebellion earlier this year, according to Harris pollsters, and had struggled to return to pre-crisis levels.
The poll of 922 people also showed that 25 percent of French people trust far-right chief Marine Le Pen, up three percentage points from May.
Mr Macron, who has put European renewal at the heart of his presidency and repeatedly warned against the dangers of euroscepticism, took a personal hit when his centrist movement was nudged into second place by Mrs Le Pen’s anti-Brussels Rassemblement national (RN) in the EU election.
Her RN party, formerly known as the Front National, won 23.3 percent of the French vote, a little under one percentage point ahead of Mr Macron’s La République en Marche (REM) list on 22.4 percent.
While the result is a defeat for Mr Macron, his camp has insisted it is not punishing and would not put a dent in his European ambitions.
The 41-year-old europhile remains determined to fashion himself as the leader of Europe and roll out his European reform plans, which he says have been hampered by ongoing uncertainty over the UK’s post-Brexit relationship with the EU.
Mr Macron has been the most outspoken EU leader in blasting what he has called the “lies” of the Leave camp, saying last month he did not want Britain’s messy departure to “pollute” the bloc.
On Monday, he reiterated his concerns about the disruptive effects of Brexit, insisting that October 31 should be the “final” deadline for the oft-delayed withdrawal.
He was among those opposed to granting the UK a long extension of its date for the divorce when it was moved from March until the end of October.
“I think this is the final, final deadline because I don’t want the new Commission and this new executive to have to deal with this… I think it is a big mistake to procrastinate,” Mr Macron said.
“I do believe we now have to implement the British people’s decision. Except if the British people themselves decide something else. That’s why I was always pictured as the tough guy in the room on this Brexit issue. But I do endorse such a role,” he continued.
Mr Macron was speaking in English at the Elysée presidential palace in Paris with members of the International Monetary Conference.
However, the French leader said he would agree to another extension of the Brexit deadline if Britain asked for more time to hold a second referendum.
“It’s feasible if we have the perspective of either a new referendum or a totally new scheme which would be acceptable for the 27 and our negotiator,” he said.
But he described any possible attempt by London to try and renegotiate the current exit deal and remove the controversial Irish backstop clause as a “non-starter.”