In the large-scale forest fires in Central Portugal, 43 people were killed.
Several firefighters are among the 59 injured, the officials said.
The country's prime minister has called it "the biggest tragedy of human life that we have known in years".
The prime minister said the death toll could rise as firefighters inspected charred remains of some buildings in remote villages.
"The smoke cloud is very low, which does not allow helicopters and fire planes to work efficiently ... but we're doing everything possible and impossible to put out this fire", Gomes said, adding that no villages were now at risk.
Some 60 forest fires broke out overnight on Saturday, as temperatures passed 40C in several regions.
Spain dispatched two water-bombing planes on Sunday morning to aid the Portuguese fire service on the ground, Costa said.
Images are coming out of Portugal of the aftermath of a fire that scorched a forested area in the center of the country over the weekend, leaving at least 61 dead, according to a spokesperson at Portugal's interior ministry.
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"We have been able to determine that the origin of the fire was caused by dry thunderstorms".
"I am shocked and horrified by the many lives claimed by today's devastating fires", said UN Secretary General Antonio Guterres Sunday. The country is also now experiencing a heat wave, with temperatures exceeding 104 degrees Fahrenheit.
Schools in the area were closed until further notice and outdoor fires were banned, authorities announced Sunday.
Six firefighters have been seriously injured and two that were reported missing have been found with injuries.
Portuguese National Republican Guard firefighters work to stop a forest fire from reaching the village of Avelar, Portugal, on June 18.
The fire, which has yet to be controlled, is already one of the deadliest forest fires in Portugal in decades.
Mariano Rajoy has tweeted that he is "overwhelmed by the tragedy at Pedrogao Grande".
Portuguese President Marcelo Rebelo de Sousa went to the scene, about 110 miles northeast of Lisbon, after midnight and said there was no lack of immediate response to face the blaze.