Mayor Claudia Sheinbaum said that was to avoid more job losses among bar employees.
New guidelines that went into effect Monday also allow movie theaters, swimming pools and museums in Mexico City to open at 30% of capacity.
The mayor delivered her daily press briefing from home on Monday after she announced she was isolating after one of her top officials tested positive for the novel coronavirus.
The city government has been performing slightly more tests than the strikingly low level of testing done nationwide. Nationwide, less than one in 100 people have been tested; the city has administered about 1.5 tests per 100 residents.
The city government reports about 80,000 confirmed coronavirus cases and about 9,400 COVID-19 deaths so far.
Nationwide, Mexico reported 5,558 newly confirmed coronavirus cases Monday, bring the accumulated total to 485,836. Confirmed deaths rose by 705 to just over 53,000.