The first blaze began in Balarés, in the parish of Cospindo, and was followed by four others in Brántuas, A Graña, Cores and Nemeño.
Two of the five fires, those in Cospindo and Cores, were stabilised by Sunday evening, while the others remained active.
Residents were evacuated from Balarés and O Osmo on Saturday as flames approached homes and beaches.
Officials suspect the newer fires were deliberately set, as they started separately from the initial blaze, which was linked to a downed power line.
Hundreds of emergency personnel, supported with aircraft and helicopters, have been deployed.