Some 45,000 people had gathered by the start of the mid-morning Mass, according to Vatican security services.
At the beginning of the Easter ceremony inspired by the core Christian belief that Jesus rose from the dead after his crucifixion, Francis sprinkled holy water and sounded somewhat tired as he recited ritual words in Latin.
A canopy on the edge of steps on the square sheltered the pontiff, who was back in the public eye 12 hours after a 2.25-hour long Easter vigil ceremony in St. Peter’s Basilica the night before.
Still recovering from bronchitis, Francis, 86, skipped the traditional Good Friday procession at Rome’s Colosseum due to unseasonably cold nighttime temperatures.
Sunday was breezy, but the temperature quickly rose a day after rain and strong wind gusts lashed Rome.
At the end of the Mass, Francis was set to deliver a speech that pontiffs give on Christmas and Easter. Known by its Latin name, “Urbi et Orbi,” which means to the city and to the world, the message is a frequently an occasion to decry wars and injustices around the globe, including religious persecution.
Francis has generally rebounded following a three-day stay last week at a Rome hospital where he was administered antibiotics intravenously for bronchitis. He was discharged on April 1. Except for forgoing the Colosseum Way of the Cross torch-lit procession, he has stuck to a heavy schedule of Holy Week public appearances.