Portugal is currently open to tourists with requirements.
Holders of EUDCC will be allowed to enter Portugal, without being subject to further restrictions (testing or quarantine). Unvaccinated travellers from the EU, UK, US, Brazil, Japan, Australia, South Korea, Saudi Arabia, New Zealand, Singapore and Canada, will not have to quarantine, but show a negative PCR test within 72 hours of boarding or a Rapid Antigen test within 48 hours. Source
Face masks are required in enclosed public spaces, on public transport, and whenever a social distance of 2 meters cannot be maintained. Restaurants and bars are partially open with limited capacity. Nightclubs remained closed. It is mandatory to present EU COVID Digital Certificate or a negative test in: Tourist accommodation, restaurants, bars and most non-essential places.