Homes and temples were decorated with floral decks to welcome the mythical King Mahabali, who is believed to visit his subjects on the ''Thiruvonam'' day of the Malayalam month of Chingam (first month of the Malayalam calendar).
Cutting across class, caste and religious barriers, all sections of people joined the harvest festival. Legend has it that Kerala was once ruled by the ''Asura'' king Mahabali, under whose reign everyone were happy and lived in an Utopia where falsehood and deception were unknown.
The ''Devas'', however, grew jealous of the popular king and had him banished down to the netherworld by Lord Vishnu, who incarnated as Vamana, the dwarf, for the purpose.Before going down, Mahabali secured a boon from Vishnu that he would visit his subjects on ''Thiruvonam'' day every year.
Over the centuries, Onam has assumed a secular dimension and state-sponsored cultural programmes and public festivities have become an integral part of the festival.
Wearing new clothes and enjoying a sumptuous feast called ''sadya'' comprising rice, curries and scores of sweet and hot delicacies served on plantain leaf is a main feature of the festival.
State agencies have organised special Onam fairs all over the state for supply of essentials and vegetables at subsidised prices, which brought much relief to the common people reeling under steep hike in prices of the commodities.
Though north and central districts had been lashed by heavy rains ahead of the festivities,the weather has brightened since yesterday.
Kerala Governor MOH Farook, Chief Minister Oommen Chandy and leaders of various political parties greeted people on the occasion.