The patroness of Siderno is Our Lady of Portosalvo: deeply felt by the population, her veneration culminates in the first ten days of September with a great patronal feast in her honour.
In the Church of Santa Maria di Portosalvo, a painting depicting the Madonna dell'Arco, dated 1910, is also held, along with the statue of Our Lady of Lourdes, celebrated on 2 June. The town also holds the Church of San Nicola di Bari and the Monument to the Sailor.