Onam Onam 2020 | Thiruvonam | Onam Festival | Onam Dates 2020 | Atham December 3, 2019December 3, 2019 keralam 1 Comment onam 2019, onam 2020, onam 2020 malayalam calendar, onam 2020 thiruvonam date, onam festivals, Onam Holidays in Kerala, onam pookalam 2020, Thiruvonam Onam 2020 date is on August 31, Monday. Onam is the most famous festival of Kerala. All Malayali’s irrespective of religion celebrates it. It falls in the Malayalam month of Chingam (Aug-Sept) Malayalam calendar. It is the harvest festival of Kerala.Onam Festival Onam date for 2019 has been on 11th September.