First Onam 2024 Date. Onam (malayalam:ഓണം) is the largest festival in the indian state of kerala. Onam is celebrated on dwadashi tithi of shukla paksha in the month of bhadrapada and under shravana nakshatra.

This festival occurs on the shravana asterism, which is the day of thiruvonam. According to the drik panchang, onam will commence on september 5 and conclude on september 15.