The number of people who approve of his actions as president dropped 10 percentage points in August to 31 per cent, the Ifop poll for Paris Match magazine and Sud Radio showed.
The survey also showed the ambitious centrist is now less popular than his predecessor François Hollande, whose approval rating was at 32 percent at the same stage of his term in September 2013.
Mr Hollande went on to become the most unpopular president in French polling history.
Only 32 percent of respondents said they approved of his economic policies, compared with 68 percent who said they disapproved.
Mr Macron was also described as aloof, with 78 percent saying he is too far removed from the “concerns of French people”.
Just 35 percent approve of his vision for France’s future, down 10 points in one month.
The Ifop survey also showed that 32 per cent of those who voted for him in the first round of the presidential election in April 2017 now disapprove of his actions as president.
“This rise in disapproval among voters reflects the summer and Mr Macron’s terrible political rentrée.”
Ifop’s head of polling, Frédéric Dabi, told Sud Radio: “This rise in disapproval among voters reflects the summer and Mr Macron’s terrible political rentrée.
“We can tell by looking at the results that the government has had a difficult summer, and that Mr Macron is struggling to restore his authority following the Benalla affair.”
Mr Macron is facing problems on all fronts.
In July, a video of his senior bodyguard, Alexandre Benalla, hitting a May Day protester while off duty and wearing police tags and a riot helmet sparked opposition claims of a cover-up after it emerged that top Elysée officials had known about the incident for months but failed to report it.
The so-called “Benalla affair” called into question the workings of the state as well as Mr Macron’s election promise to build an “exemplary” Republic.
Just last week, the 40-year-old leader further irked the opposition by describing the French as “resistant to change”.
The remark, made during an exchange with French expatriates in Denmark, echoed previous comments by Mr Macron saying the French “hate reforms” and that the country is “unreformable”.
“As usual, he scorns the French while abroad. The French will take great pleasure in responding to his arrogance and contempt,” far-right leader Marine Le Pen tweeted.
Far-left lawmaker Alexis Cobière, for his part, denounced Mr Macron for his “staggeringly stupid remarks”.
The Ifop poll of 1,015 people aged 18 and over was carried out online between August 30 and August 31.