Crowds of devotees had gathered on the banks of the Yamuna river and at lakes and canals to offer prayers to the setting Sun on the third day of the festival.
Married women observing over 38-hour fast stood in knee-deep water and prayed for the well-being and prosperity of their families.
The observances today as part of the four-day festival saw people offering prayers at more than 50 major sites across the national capital.
Thousands of devotees thronged to Soor Ghat, Geeta Ghat near ISBT, Purvi Ghat, Hathi Ghat, Kudesiya Ghat, Shyam Ghat, Yamuna Ghat and Kalindi Kunj Ghat, among others, to take part in the Chhath ceremonies.
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Makeshift pandals, sandbanks, floodlights and barricades were put up across the ghats' premises.
Meanwhile, traffic congestion was reported in several parts of Delhi including like ITO, Baba Kharak Singh Marg, outer ring road, Dabri Marg in South East Delhi, among others.
Delhi Police also used helicopter to monitor the traffic situation around ghats.
The age-old tradition, which pays obeisance to the sun god, is observed mainly by people from Bihar and eastern UP.
The national capital has a sizeable population of people hailing from the two states.
On second day before Chhath puja is Kharna, in which devotees observe a day-long fast which ends after sunset. Devotees cook 'kheer' and share it with family and relatives.
On the third day those observing Chhath puja stand in water and offer 'arghya' to the setting Sun amid chanting of mantras and hymns.
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At ITO Paschim Ghat, which has a capacity of around 40,000 devotees, the Chhath Puja Samiti had made adequate arrangements including food packets for devotees besides the safety measures.
He said that these devotees can stay here and perform morning prayers.