Critics also accused the government of overcompensating after it had been too lax in implementing health measures. For example, some supermarkets have not maintained social distancing at checkout lines and many shops have not been vetting vaccine passports.
The public uproar was particularly acute because it was the second time Quebec had imposed a curfew; the last one, in January, lasted five months.
Canada is among the countries that have seen the biggest surge in new virus cases, which have more than doubled in a week to an average of more than 25,000.
Among other new restrictions, restaurants are to be closed for indoor dining, the start of in-person elementary and high school classes has been delayed until Jan. 17 and places of worship are to be closed except for funerals.
Mr. Legault said the restrictions were aimed at protecting the unvaccinated from themselves, given the high rate of hospitalization among those who have refused be inoculated. That, in turn, prompted criticism from people who said they had respected public health rules and were being unfairly punished for the irresponsible behavior of a minority of Quebecers.