People wore traditional attire and offered prayers at temples while the day was marked by feast and festivities, including cultural programmes organised by various institutions.
Heavy rush was witnessed at temples, including at the famous hill shrine of Lord Ayappa at Sabarimala, Sree Krishna Temple at Guruvayur and Sree Padmanabha Swamy Temple here.
Onam is celebrated to honour demon King Mahabali, who according to legend ruled the state once, under whom the people were equal, prosperous and happy.
People believe that on this particular day of Thiruvonam Lord Mahavishnu in his fifth avatar as Vamana, appeared in the kingdom of King Mahabali and sent him to the netherworld.
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People thronged markets till last night to buy their favourite items for Onam celebrations.
Long queues of people were seen at the fair-price shops opened by State Civil Supplies Corporation, Horticorp and Consumer fed, as part of government efforts to control spiralling prices in the open market.
The day also witnessed a protest in front of the secretariat here by Kerala State road transport corporation employees who staged a hunger strike demanding payment of salary and pension on time.
The week-long tourism celebrations got off to a colourful start last evening with a music and dance performance by noted actress Manju Warrier.
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