When Is Diwali 2025 In Tamil Nadu. Diwali is celebrated on amavasya of the krishna paksha in aswayuja or ashwin month or the day of no moon in the month of ashwayuja as per the lunar calendar. Diwali puja is also known as deepavali puja.

In 2025, diwali will be celebrated across india on tuesday 21 october. The term deepavali is formed by coining the sanskrit words, deep (lamp) and vali (array).