When Is Onam Festival In 2024. The most important feast is served on thiru onam, the key date of the festival, which this year is on september 15. The main festivity, i.e., thiruvonam, will take place on 15th september 2024 (sunday).

Thiruvonam dates varies yearly based on the malayalam calendar. Onam 2024 will begin on 6 september, 2024 end.