"There will be four or five people singing, with music about God," said Chiara Facci with Catholic group Sentinelli del Mattino. Night time activities, which will not include Mass, will run from 10 p.m. to 1 a.m.
The first attempt to inaugurate the inflatable church last month on the holiday island of Sardinia failed after strong winds forced organisers to relocate, she said.
Big cities like Rome and Milan empty in August, when Italians head to the beach for summer holidays, leaving streets empty and many businesses closed. Churches are hardly immune, and also see their congregations thin.
On the Mediterranean coast, nuns from a convent near the southern Italian city of Naples have relocated to beach cabins to join holidaymakers saying the rosary. An adjoining altar was set up under two tents.
"The concept of a beach-convent is something that is appreciated by vacationers and the nuns themselves," priest Antonio Rungi, who helped spearheaded the initiative, told Italian news agency ANSA.