Atham 2024 Date Of. In 2024, anant chaturdashi will be celebrated on september 17.  — onam 2024 officially begins with atham on september 6 and culminates with thiruvonam on september 15.

Onam festivities are held on the day that nakshatra thiruvonam appears in the month of chingam.  — celebrated in the malayalam month of chingam, the festivities of onam start from atham and last for 10 days till thiruvonam.