The Onam 2026 date is not explicitly mentioned in the provided evidence. However, the article discusses the significance and history of Onam, a traditional festival celebrated in Kerala, India. According to the article, Onam is celebrated in the month of Chingam, which typically falls in August or September in the Gregorian calendar. The article also mentions that the festival is celebrated for 10 days, with the main day being Thiruvonam. Unfortunately, the article does not provide the exact date of Onam 2026. It is essential to note that the article does not contain specific information about the date of Onam 2026, and any attempt to provide a date would be speculative.