The fires, which started on Saturday in the district of Castelo Branco, caused severe burns to a civilian while injuring seven firefighters, reports said.
Authorities evacuated dozens of people from a village as a precaution. The country's National Authority for Civil Protection said they believe the fires would be controlled on Sunday morning.
The fires broke out after the authorities issued on Friday a three-day fire warning due to forecasted hot, dry and sporadic windy weather over the coming weekend throughout the country.
Since March, some regions have seen frequent erratically high temperatures and windy weather, resulting in wildfires that occurred far earlier in the season than usual.
The situation is not confined to Portugal. According to a research of the European Commission' Joint Research Center, wildfires in the first quarter of 2019 have burned more land in Europe than in the entire year of 2018.