Onam Date In 2025. Onam 2025 will be celebrated from september 6 to 15, with the main day, thiruvonam, on september 15. Onam festivities are held on the day that nakshatra thiruvonam appears in the month of chingam.
In 2025, onam will start on 6th september and end on 17th september, with the main day being. Onam is a key hindu festival for south indians, especially malayalis and keralites.