The DGS epidemiological bulletin also indicates that 3,260 people are hospitalized, 89 more than on Monday, of which 512 are in intensive care, or two more.
Since the beginning of the pandemic, Portugal has registered 7,286 deaths and 436,579 cases of infection with the SARS-CoV-2 virus, and 80,183 people are now active, 175 more than on Monday.
Health authorities have 96,577 contacts under surveillance, 1,828 more than the previous day.
The bulletin also reveals that a further 4,691 people have been reported as recovered.
Since the beginning of the epidemic in Portugal in March, 349,110 people have recovered.
Regarding the 90 deaths registered in the last 24 hours, 33 occurred in the North region, 24 in Lisbon and Tagus Valley, 17 in the Centre region, 14 in Alentejo, one in the Algarve region and one in the Autonomous Region of Madeira.
Also according to the DGS bulletin, the North region registered the highest number of new infections by SARS-CoV-2 in the last 24 hours (1,945). Since the beginning of the pandemic, the Northern region has registered 218,546 cases of infection and 3,312 deaths.
In the region of Lisbon and Vale do Tejo, 1,552 new infections have been reported, with 141,509 cases and 2,536 deaths so far.
In the Centro region there have been a further 845 cases, with 51,736 infections and 1,062 deaths.
In the Alentejo region a further 310 cases were reported, totalling 12,376 infections and 263 deaths.
The Algarve region has today reported 193 new cases, totalling 8,529 infections and 75 deaths.
Madeira has registered 72 new cases. This autonomous region accounts for 1,826 infections and 16 deaths due to Covid-19.
In the Autonomous Region of the Azores 39 new cases were registered in the last 24 hours, totalling 2,057 infections and 22 deaths.
The confirmed cases are spread over all age groups, with the highest number of infections being recorded between 20 and 59 years old.
The new coronavirus has already infected at least 196,260 men and 240,164 women in Portugal, according to DGS data, 155 cases of unknown sex are under investigation as these data are not provided automatically.
Of the total number of fatalities, 3,793 were men and 3,493 women.
The highest number of deaths is still concentrated in the elderly over the age of 80, followed by people aged between 70 and 79.
The Covid-19 pandemic caused at least 1,854,305 deaths as a result of more than 85 million cases of infection worldwide, according to a report by the French agency AFP.